N-CSR

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-CSR

CERTIFIED SHAREHOLDER REPORT OF REGISTERED
MANAGEMENT INVESTMENT COMPANIES

Investment Company Act file number			811-02224
MML Series Investment Fund
(Exact name of registrant as specified in charter)
1295 State Street, Springfield, MA					01111
(Address of principal executive offices)					(Zip code)
David W. O’Leary
1295 State Street, Springfield, MA  01111
(Name and address of agent for service)
Registrant’s telephone number, including area code:				413-788-8411
Date of fiscal year end:	12/31/2005
Date of reporting period:		12/31/2005

Item 1. Reports to Stockholders.

(Annual Report for the period 1/1/05 through 12/31/05 is filed herewith)

MML Series Investment Fund

Annual Report
for the year ended
December 31, 2005

MML Large Cap Value Fund

MML Equity Index Fund

MML Growth Equity Fund

MML OTC 100 Fund

MML Small Cap Growth Equity Fund

MML Emerging Growth Fund

INVEST

INSURE

RETIRE

Table of Contents

Letter to Shareholders	1
Portfolio Manager Reports	3
Portfolio of Investments	21
MML Large Cap Value Fund MML Equity Index Fund MML Growth Equity Fund MML OTC 100 Fund MML Small Cap Growth Equity Fund MML Emerging Growth Fund	21 23 29 33 35 39
Statement of Assets and Liabilities	42
Statement of Operations	46
Statement of Changes in Net Assets	48
Financial Highlights	52
Notes to Financial Statements	59
Report of Independent Registered Public Accounting Firm	69
Trustees and Officers (Unaudited)	70
Federal Tax Information (Unaudited)	72
Other Information (Unaudited)	73

This material must be preceded or accompanied by a current prospectus for the MML Series Investment Fund. Investors should consider a Fund's investment objective, risks and charges and expenses carefully before investing. This and other information about the investment company is available in the prospectus. Read it carefully before investing.

MML Series Investment Fund – Letter to Shareholders

To Our Shareholders

David O'Leary

The new year provides investors with an excellent opportunity to take their financial pulse by checking in with their financial representative. For 2006, there are mixed signals on the investment horizon. MassMutual, however, stands by its conviction that most investors are best served by attention to proper asset allocation and an investment strategy that concentrates on the long term.

2005: A stormy year in many respects

Weather-related stories dominated the headlines for the 12 months ended December 31, 2005 – beginning with the fallout from the late 2004 Indian Ocean tsunami. Elsewhere, October's devastating Pakistan earthquake and Hurricanes Katrina, Rita and Wilma heightened investors' awareness of the power of nature and the impact of current events on the markets.

On the economic front, the first three months of 2005 saw the broader U.S. stock averages struggle unsuccessfully against the headwinds of widespread expectations for slower economic growth, reduced corporate profits and rising inflation – especially in the form of rising crude oil prices. Foreign stocks substantially outperformed U.S. stocks in this environment, but bond prices struggled.

In the second quarter, U.S. stocks struggled to find direction, as moderately positive news on the economy and corporate earnings was tempered by high crude oil prices, rising short-term interest rates and concerns about slowing economic growth. A strong U.S. dollar hampered foreign stocks. In the bond market, Treasuries outperformed other fixed-income asset classes.

Broad-based U.S. stock indexes advanced in the third quarter, as favorable second quarter earnings boosted the market in July. In the bond market, longer-maturity yields rose in July on better-than-expected economic performance, then backed off as soaring crude oil prices once again raised fears of a slowing economy. The Lehman Brothers® Aggregate Bond Index, a broad measure of the U.S. investment-grade fixed-income markets, closed the quarter with a return of -0.67%.*

Stocks made upward progress in the fourth quarter, boosting many broad-based stock indexes into positive territory for full-year 2005. The U.S. economy grew at a pace of 4.1% in the third quarter, lower than initial estimates, but still pleasantly surprising many observers. For the full year, the Dow Jones Industrial Average^SM (The Dow), a barometer of blue-chip stock activity, returned -0.61%, after losing ground in the final week of December. The technology-focused Nasdaq Composite^® Index gained 1.37% for the 12-month period, trailing the S&P 500^® Index, a measure of U.S. large-cap stock performance, which returned 4.91% in the same period. The clear winner for the year, however, was the MSCI^® EAFE^® Index, a benchmark for foreign stocks that delivered an impressive 13.54% return.*

In the bond market during the fourth quarter, the yield curve continued to flatten – indicating a smaller difference in yields between shorter- and longer-term fixed income investments. This flattening of yields is due in large part to persistent upward pressure on short-term yields by the Federal Reserve's (Fed's) credit-tightening and the relatively flat movement of longer-term yields. For the full year, the Lehman Brothers Aggregate Bond Index advanced 2.43%.*

The Major Stories of 2005

Among the events affecting the financial markets during 2005, the sharp rise in energy prices qualifies as one of the most important. Crude oil prices, which began the year near the $40-per-barrel level, ended December around $60 a barrel, following a brief surge above $70 at the end of August. In pure percentage terms, the advance in natural gas was even greater. Many Americans felt the energy squeeze most acutely in the rising cost of unleaded gasoline – whose average per-gallon price

*  Indexes are unmanaged, do not incur fees or expenses and cannot be purchased directly for investment.

(Continued)

1

MassMutual Funds – Letter to Shareholders (Continued)

increased during the year from around $1.75 to $2.20. Fears that higher energy costs might hamper consumer spending turned out to be unfounded, however. From the Friday after Thanksgiving through December 24, U.S. consumers spent 8.7% more in 2005 than in the previous year.

Rising short-term interest rates were another important trend in 2005. The Fed boosted the federal funds rate in 0.25% increments a total of eight times during the year – for a total of 2.0%. Rising interest rates mean higher costs for various types of consumer and business loans. One area of particular concern is home mortgages, along with home equity loans and lines of credit, which have helped finance a significant portion of consumer spending during the past few years. Many experts are concerned about what will happen to consumer spending if housing prices decelerate significantly. Two news items pointed to concerns about real estate's immediate prospects near the end of December. The Mortgage Bankers Association reported that U.S. mortgage applications fell to more than a three-and-a-half-year low, and the National Association of Realtors reported that inventories of existing homes for sale rose to their highest level in more than 19 years.

Outlook

The beginning of the new year is an ideal time to assess your long-term financial strategy. An annual check-up with your financial representative can help ensure that you have positioned yourself to reach your long-term financial goals.

As we proceed into 2006, key economic indicators are mixed. The positive factors include an economy that continues to grow faster than expected, rebounding consumer confidence, muted inflation and interest rates that are still low by historical standards. Currently, strong corporate balance sheets, forecasts for double-digit earnings growth in 2006 and moderate valuations are also positives. Cautionary factors include the possibility that consumer spending will weaken as home refinancing opportunities dry up, and a market that has slowed its advance somewhat in the third year of this bull market. That said, we believe that most investors are best served by attention to proper asset allocation and an investment strategy that focuses less on the market's short-term movements and more on the long term potential. (As always, past performance is no guarantee of future results.)

The information provided is the opinion of MassMutual as of 1/1/2006 and is subject to change without notice. It is not to be construed as tax, legal or investment advice.

David O'Leary
President

2

MML Large Cap Value Fund – Portfolio Manager Report

What is the investment objective of the MML Large Cap Value Fund?   This Fund seeks both capital growth and income by selecting high-quality, large-capitalization companies primarily in the S&P 500^® Index.

How did the Fund perform during the 12 months ended December 31, 2005?   The Fund's shares returned 9.38%, outpacing the 4.91% return of the S&P 500 Index, a widely recognized, unmanaged index representative of common stocks of larger capitalized U.S. companies.

What was the investment backdrop during the period?   The first quarter saw the broader U.S. stock averages struggle unsuccessfully to remain above the break-even mark in the midst of widespread expectations for slower growth by the nation's economy and a reduction in corporate profits. On the fixed-income front, bond yields fell and prices rose in January, but fears of rising inflation later in the quarter reversed much of the advance. Additionally, there were two 0.25% hikes in short-term interest rates by the Federal Reserve (Fed) during the first three months of 2005. Turning to the second quarter, U.S. stocks traded indecisively, as moderately positive news on the economy and corporate earnings was tempered by high crude oil prices, rising short-term interest rates and concerns about slowing economic growth.

Broad-based U.S. stock indexes advanced in the third quarter, as favorable second quarter earnings boosted the market in July. In the bond space, longer-maturity yields rose in July on better-than-expected economic performance, then backed off as rising crude oil prices once again raised fears of a slowing economy. Stocks made upward progress in the fourth quarter, propelling many broad-based stock indexes into positive territory for full-year 2005. In the bond market, the yield curve – a measure of the disparity of yields of bonds of comparable credit quality across a range of maturities from three months to 30 years and used as an economic indicator – continued to flatten, due to the Fed's persistent upward pressure on short-term yields and the relatively flat movement of longer yields.

What factors contributed to the Fund's performance – and how did you respond?   Energy companies were the most important contributors to the Fund's performance over the year. Energy was also the strongest-performing sector of the S&P 500 Index. The Fund benefited both by its overweight position in energy – and from positive stock selection within the sector. All of the Fund's energy companies performed well, with EOG Resources, Devon Energy, ConocoPhillips and Occidental Petroleum among the top performers.

The Fund's largest industry holdings were in diversified financial companies, insurance companies and consumer staples firms. All three sectors were important contributors to performance for the 12-month period. Moody's (a diversified financial company), Progressive, Loews, and American International Group (three insurance companies), and Altria (a consumer staples company) were among the Fund's top contributors to results. On the other hand, Avon Products – a consumer staples company initially purchased in June 2005 – ranked among the top detractors from performance.

The Fund's holdings in both consumer discretionary and industrial companies hampered its progress for the year. Consumer discretionary companies among the top detractors included Comcast, Gannett, and Autozone (sold in October 2005). Industrial companies hindering performance included Tyco and United Parcel Services. Lexmark, an information technology company, and Fifth Third Bancorp, a bank, were also among the top detractors.

The Fund had approximately 8% of its portfolio invested in foreign companies on December 31, 2005. Collectively, the foreign companies owned by the Fund underperformed the S&P 500 Index over the year.

3

MML Large Cap Value Fund – Portfolio Manager Report (Continued)

What is your outlook?   We enter 2006 with both positive and negative factors on the horizon. The positives include an economy that continues to grow more than expected, rebounding consumer confidence, muted inflation and interest rates that are still low by historical standards. Currently strong corporate balance sheets, forecasts for double-digit earnings growth in 2006 and moderate valuations also provide evidence of an optimistic outlook for the year. Conversely, cautionary factors include the possibility that consumer spending will weaken as home refinancing opportunities dry up, a historically challenging phase of the four-year presidential cycle and a market that has slowed its advance somewhat. In an environment with such conflicting signals, investors may be well served by focusing on proper asset allocation and an investment strategy tha t concentrates on long-term results.

MML Large Cap Value Fund Industry Table (% of Net Assets) on 12/31/05
Banking, Savings & Loans	14.3	%
Financial Services	13.6	%
Insurance	13.3	%
Energy	10.2	%
Short-Term Investments and Other Assets and Liabilities	6.5	%
Retail	5.9	%
Commercial Services	4.9	%
Tobacco	4.9	%
Industrial – Diversified	4.4	%
Broadcasting, Publishing & Printing	3.6	%
Healthcare	3.1	%
Containers	2.2	%
Computers & Information	1.6	%
Beverages	1.5	%
Automotive & Parts	1.4	%
Building Materials & Construction	1.4	%
Prepackaged Software	1.3	%
Transportation	1.2	%
Pharmaceuticals	1.1	%
Communications	0.8	%
Cosmetics & Personal Care	0.8	%
Foods	0.7	%
Computers & Office Equipment	0.5	%
Advertising	0.3	%
Computer Related Services	0.2	%
Travel	0.2	%
Household Products	0.1	%
	100.0	%

MML Large Cap Value Fund
Largest Stock Holdings (12/31/05)

American International Group, Inc.

Altria Group, Inc.

American Express Co.

Tyco International Ltd.

JPMorgan Chase & Co.

Costco Wholesale Corp.

Golden West Financial Corp.

Progressive Corp.

Berkshire Hathaway, Inc. Cl. A

HSBC Holdings PLC

4

MML Large Cap Value Fund – Portfolio Manager Report (Continued)

Growth of a $10,000 Investment

Hypothetical Investments in MML Large Cap Value Fund and the S&P 500 Index.

MML Series Investment Fund

Total Return	One Year 1/1/05 - 12/31/05			Five Year Average Annual 1/1/01 - 12/31/05			Since Inception Average Annual 5/1/00 - 12/31/05
MML Large Cap Value Fund		9.38	%		3.36	%		2.76	%
S&P 500 Index		4.91	%		0.54	%		–1.06	%

GROWTH OF A $10,000 INVESTMENT SINCE INCEPTION

Performance data quoted represents past performance; past performance is not predictive of future results. The investment return and principal value of shares of the Fund will fluctuate with market conditions so that shares of the Fund, when redeemed, may be worth more or less than their original cost. Current performance of the Fund may be lower or higher than the performance quoted. Performance data current to the most recent month end may be obtained by accessing the website at www.massmutual.com.

Investors should note that the Fund is a professionally managed mutual fund, while the S&P 500 Index is unmanaged and does not incur expenses, and cannot be purchased directly by investors. Investors should read the Fund's prospectus with regard to the Fund's investment objective, risks and charges and expenses in conjunction with these financial statements. The Fund's return reflects changes in the net asset value per share without the deduction of any product charges. Total return figures would be lower for the periods presented if they reflected these charges.

5

MML Equity Index Fund – Portfolio Manager Report

What is the investment objective of the MML Equity Index Fund?   The Fund seeks to provide investment results that correspond to the price and yield performance of publicly traded common stocks in the aggregate as represented by the S&P 500^® Index. The Fund pursues this objective by investing at least 80% of its assets in the equity securities of companies that make up the S&P 500 Index.

How did the Fund perform during the 12 months ended December 31, 2005?   The Fund's Class I shares returned 4.53%, moderately trailing the 4.91% return of the S&P 500 Index, a widely recognized, unmanaged index representative of common stocks of larger capitalized U.S. companies.

What was the investment backdrop during the period?   The first quarter saw the broader U.S. stock averages struggle unsuccessfully to remain above the break-even mark in the midst of widespread expectations for slower growth by the nation's economy and a reduction in corporate profits. On the fixed-income front, bond yields fell and prices rose in January, but fears of rising inflation later in the quarter reversed much of the advance. Additionally, there were two 0.25% hikes in short-term interest rates by the Federal Reserve (Fed) during the first three months of 2005. Turning to the second quarter, U.S. stocks traded indecisively, as moderately positive news on the economy and corporate earnings was tempered by high crude oil prices and rising short-term interest rates. In the bond market, Treasuries outperformed other fixed-income asset class es, while investment-grade bonds outpaced high-yield securities in the corporate sector.

The third quarter was dominated by a strong rally in oil prices, compounded by the impact of Hurricanes Katrina and Rita. The Fed raised the federal funds rate twice during the quarter, its main concern being the increasing risk of inflation due to escalating energy costs. The economic environment continued nearly unchanged in the fourth quarter, as oil prices and interest rates continued to dominate the headlines – and the Fed raised interest rates twice more, bringing the total to eight 0.25% increases in 2005. After reaching $70 per barrel at the end of August, light crude oil prices retreated during the fourth quarter and finished the year at $61 per barrel.

What factors contributed to the Fund's performance?   In the first quarter, growth stocks outpaced value issues, and small- and mid-cap securities ended the period in negative territory. On a sector basis, the energy and utilities sectors posted the best performance – but not enough to bring the S&P 500 Index (the Index) into positive territory. The financial sector of the Index lost 6.38% and information technology dropped 7.33%. The worst-performing sector for the period, telecommunications services, returned –7.78%. Against the backdrop of high oil prices and two interest hikes by the Fed, the majority of U.S. equity indexes posted negative returns for the period.

In the second quarter, value stocks outpaced their growth counterparts, and small- and mid-cap securities posted positive returns. From a sector perspective, utilities and financials sectors posted the best performance, up 9.31% and 4.33%, respectively. The health care sector was also positive for the period, posting a return of 4.13%. The increase in the energy sector continued, as that sector advanced 1.99%. The worst-performing group for the second quarter was materials, which fell 9.47%.

Large-capitalization stocks in the third quarter underperformed both mid- and small-cap stocks. During the quarter, energy was the best-performing sector in the Index, returning 18.25%, and telecommunication services, with its loss of 1.05%, was the worst performer. In the final quarter of 2005, large-cap stocks once again underperformed mid-caps. This time, however, large issues outpaced their small-capitalization competition. Energy was the worst-performing sector in the Index, returning -7.36%; materials was the best-performing group, advancing 11.19%.

6

MML Equity Index Fund – Portfolio Manager Report (Continued)

What is your outlook?   Conflicting signals abound as we enter 2006. Positive factors include an economy that continues to grow more than expected, rebounding consumer confidence, muted inflation interest rates that are still low by historical standards – along with currently strong corporate balance sheets, forecasts for double-digit earnings growth in 2006 and moderate valuations. Conversely, cautionary factors include the possibility that consumer spending will weaken as home refinancing opportunities dry up, a historically challenging phase of the four-year presidential cycle and a market that has slowed somewhat in its advance. In such an environment, proper asset allocation and an investment strategy that concentrates on the long term are important areas of focus for investors.

MML Equity Index Fund Industry Table (% of Net Assets) on 12/31/05
Energy	9.3	%
Banking, Savings & Loans	9.2	%
Pharmaceuticals	8.5	%
Electrical Equipment & Electronics	6.8	%
Financial Services	6.2	%
Insurance	5.9	%
Retail	5.0	%
Computers & Information	3.8	%
Prepackaged Software	3.4	%
Electric Utilities	3.0	%
Telephone Utilities	3.0	%
Broadcasting, Publishing & Printing	2.4	%
Cosmetics & Personal Care	2.4	%
Medical Supplies	2.4	%
Aerospace & Defense	2.2	%
Beverages	2.1	%
Transportation	1.9	%
Commercial Services	1.6	%
Industrial – Diversified	1.6	%
Foods	1.5	%
Healthcare	1.5	%
Tobacco	1.5	%
Chemicals	1.4	%
Communications	1.1	%
Computers & Office Equipment	1.0	%
Machinery & Components	1.0	%
Entertainment & Leisure	0.9	%
Data Processing & Preparation	0.8	%
Metals & Mining	0.8	%
Apparel, Textiles & Shoes	0.6	%
Automotive & Parts	0.6	%
Household Products	0.6	%
Restaurants	0.6	%
Short-Term Investments and Other Assets and Liabilities	0.6	%
Communications Equipment	0.5	%
Home Construction, Furnishings & Appliances	0.5	%
Real Estate	0.5	%
Computer Integrated Systems Design	0.4	%
Forest Products & Paper	0.4	%
Information Retrieval Services	0.4	%
Manufacturing	0.4	%
Lodging	0.3	%
Advertising	0.2	%
Building Materials & Construction	0.2	%
Containers	0.2	%
Food Retailers	0.2	%
Retail – Grocery	0.2	%
Air Transportation	0.1	%
Industrial – Distribution	0.1	%
Photography Equipment/Supplies	0.1	%
Toys, Games	0.1	%
Computer Programming Services	0.0	%
Travel	0.0	%
	100.0	%

MML Equity Index Fund
Largest Stock Holdings (12/31/05)

General Electric Co.

Exxon Mobil Corp.

Citigroup, Inc.

Microsoft Corp.

The Procter & Gamble Co.

Bank of America Corp.

Johnson & Johnson

American International Group, Inc.

Pfizer, Inc.

Altria Group, Inc.

7

MML Equity Index Fund – Portfolio Manager Report (Continued)

Growth of a $10,000 Investment

Hypothetical Investments in MML Equity Index Fund Class I and the S&P 500 Index.

MML Series Investment Fund

Total Return	One Year 1/1/05 - 12/31/05			Five Year Average Annual 1/1/01 - 12/31/05			Since Inception Average Annual 5/1/97 - 12/31/05
MML Equity Index Fund Class I		4.53	%		0.10	%		6.39	%
S&P 500 Index		4.91	%		0.54	%		6.89	%

Hypothetical Investments in MML Equity Index Fund Class II, Class III and the S&P 500 Index.

MML Series Investment Fund

Total Return	One Year 1/1/05 - 12/31/05			Five Year Average Annual 1/1/01 - 12/31/05			Since Inception Average Annual 5/1/00 - 12/31/05
MML Equity Index Fund Class II		4.65	%		0.27	%		–1.35	%
MML Equity Index Fund Class III		4.80	%		0.34	%		–1.26	%
S&P 500 Index		4.91	%		0.54	%		–1.06	%

GROWTH OF A $10,000 INVESTMENT SINCE INCEPTION

Performance data quoted represents past performance; past performance is not predictive of future results. The investment return and principal value of shares of the Fund will fluctuate with market conditions so that shares of the Fund, when redeemed, may be worth more or less than their original cost. Current performance of the Fund may be lower or higher than the performance quoted. Performance data current to the most recent month end may be obtained by accessing the website at www.massmutual.com.

Investors should note that the Fund is a professionally managed mutual fund, while the S&P 500 Index is unmanaged and does not incur expenses, and cannot be purchased directly by investors. Investors should read the Fund's prospectus with regard to the Fund's investment objective, risks and charges and expenses in conjunction with these financial statements. The Fund's return reflects changes in the net asset value per share without the deduction of any product charges. Total return figures would be lower for the periods presented if they reflected these charges.

8

MML Growth Equity Fund – Portfolio Manager Report

What is the investment objective of the MML Growth Equity Fund?   This Fund seeks long-term growth of capital and future income by normally investing at least 80% of its assets in the common stocks and securities convertible into common stocks of companies the Fund's sub-adviser believes offer prospects for long-term growth.

How did the Fund perform during the 12 months ended December 31, 2005?   The Fund's shares returned 3.86%, lagging the 4.91% return of the S&P 500^® Index, a widely recognized, unmanaged index representative of common stocks of larger capitalized U.S. companies.

What was the investment background during the period?   The first quarter of 2005 saw the majority of U.S. equity markets in the red, spurred in large part by mixed economic data, rising oil prices and concerns over inflation. Both large- and small-cap stocks produced negative returns for the period, although the large-cap universe slightly outpaced its small-cap counterpart. Most U.S. equity markets ended the second quarter in positive territory. Both large- and small-cap stocks rose, although the small-cap universe, in a reversal from the first quarter, slightly outpaced its large-cap competition. Also during the second quarter, the Federal Reserve (Fed) raised the federal funds rate twice – each time by 0.25%.

Despite the summer's hurricanes of devastating proportions, another federal interest rate increase, and an impending oil crisis, the third quarter of 2005 saw gains in domestic equity markets. Both large- and small-cap stocks produced positive returns for the period, although the small-cap universe slightly outpaced its large cap counterpart. The final quarter of 2005 witnessed a market that managed to stay afloat in spite of additional federal funds rate increases, rising health care and energy costs, and mixed reports pertaining to economic growth within the U.S. During the final three months of the year, both large- and small-cap stocks once again advanced, although large-cap issues slightly outpaced their small-cap brethren.

What factors contributed to the Fund's performance?   During the first quarter, sector selection was positive, aided considerably by an overweight position in oil and gas. An underweight position in the financial sector also contributed to the portfolio's relative performance. Conversely, underweight positions in both health care and food/beverages detracted from relative returns. In the second quarter, sector selection was flat relative to the S&P 500 Index. The portfolio benefited from an underweight position in manufacturing and an overweight position in oil and gas. This positive performance, however, was offset by overweight positions in the primary process industry and automotive spaces, which underperformed as groups.

Turning to the third quarter, an overweight position in oil and gas and an underweight position in manufacturing provided tailwinds to the Fund. Other contributors included underweight positions in the services and transportation sectors. Detractors included an overweight position in retail stores and underweights to technology and metals and mining. Stock selection was negative overall for the quarter, particularly in the technology space. Stock picks among oil and gas, health care, and financial issues also detracted from performance for the period. Conversely, stock selection among consumer goods securities benefited the portfolio.

Finally, favorable stock selection in the fourth quarter within the health care, services, and consumer goods sectors fueled performance. Sector selection, however, detracted during the period, due in large part to the portfolio's overweight position in oil and gas and an underweight to transportation. An overweight position in retail stores contributed to relative returns, but not enough to offset the less-than-favorable sector results.

What is your outlook?   Although the strong performance of the U.S. equity market for the past three years has been a positive for investors, it continues to be expensive, leaving little room for new opportunities. The market's inclination for risk over return appears unwarranted, but the eventual return to fundamental valuations should favor the portfolio's bias towards lower-risk investments.

9

MML Growth Equity Fund – Portfolio Manager Report (Continued)

MML Growth Equity Fund Industry Table (% of Net Assets) on 12/31/05
Retail	14.7	%
Pharmaceuticals	14.2	%
Electrical Equipment & Electronics	9.4	%
Healthcare	9.1	%
Computers & Information	6.6	%
Energy	5.6	%
Tobacco	5.6	%
Insurance	3.9	%
Short-Term Investments and Other Assets and Liabilities	3.0	%
Financial Services	2.4	%
Data Processing & Preparation	2.2	%
Machinery & Components	2.1	%
Communications Equipment	1.9	%
Medical Supplies	1.7	%
Apparel, Textiles & Shoes	1.6	%
Banking, Savings & Loans	1.4	%
Commercial Services	1.3	%
Home Construction, Furnishings & Appliances	1.3	%
Restaurants	1.3	%
Beverages	1.2	%
Aerospace & Defense	1.1	%
Information Retrieval Services	1.1	%
Telephone Utilities	1.0	%
Lodging	0.8	%
Prepackaged Software	0.8	%
Automotive & Parts	0.7	%
Cosmetics & Personal Care	0.5	%
Broadcasting, Publishing & Printing	0.4	%
Communications	0.4	%
Foods	0.4	%
Household Products	0.4	%
Transportation	0.4	%
Air Transportation	0.3	%
Computer Integrated Systems Design	0.3	%
Advertising	0.2	%
Computer Related Services	0.2	%
Electric Utilities	0.2	%
Computer Programming Services	0.1	%
Metals & Mining	0.1	%
Real Estate	0.1	%
Industrial – Distribution	0.0	%
	100.0	%

MML Growth Equity Fund
Largest Stock Holdings (12/31/05)

UnitedHealth Group, Inc.

Altria Group, Inc.

Intel Corp.

The Home Depot, Inc.

Dell, Inc.

Wal-Mart Stores, Inc.

Merck & Co., Inc.

Lowe's Companies, Inc.

Texas Instruments, Inc.

Pfizer, Inc.

10

MML Growth Equity Fund – Portfolio Manager Report (Continued)

Growth of a $10,000 Investment

Hypothetical Investments in MML Growth Equity Fund and the S&P 500 Index.

MML Series Investment Fund

Total Return	One Year 1/1/05 - 12/31/05			Five Year Average Annual 1/1/01 - 12/31/05			Since Inception Average Annual 5/3/99 - 12/31/05
MML Growth Equity Fund		3.86	%		–6.28	%		–1.91	%
S&P 500 Index		4.91	%		0.54	%		0.54	%

GROWTH OF A $10,000 INVESTMENT SINCE INCEPTION

Performance data quoted represents past performance; past performance is not predictive of future results. The investment return and principal value of shares of the Fund will fluctuate with market conditions so that shares of the Fund, when redeemed, may be worth more or less than their original cost. Current performance of the Fund may be lower or higher than the performance quoted. Performance data current to the most recent month end may be obtained by accessing the website at www.massmutual.com.

Investors should note that the Fund is a professionally managed mutual fund, while the S&P 500 Index is unmanaged and does not incur expenses, and cannot be purchased directly by investors. Investors should read the Fund's prospectus with regard to the Fund's investment objective, risks and charges and expenses in conjunction with these financial statements. The Fund's return reflects changes in the net asset value per share without the deduction of any product charges. Total return figures would be lower for the periods presented if they reflected these charges.

11

MML OTC 100 Fund – Portfolio Manager Report

What is the investment objective of the MML OTC 100 Fund?   This Fund seeks to approximate, as closely as practicable (before fees and expenses), the total return of the 100 largest publicly traded over-the-counter common stocks. The Fund pursues this objective by investing at least 80% of its assets in the equity securities of companies included in the NASDAQ 100 Index^®, which is generally recognized as representative of the over-the-counter market.

How did the Fund perform during the 12 months ended December 31, 2005?   The Fund's shares returned 1.26%, underperforming the 1.49% return of the NASDAQ 100 Index.

The NASDAQ 100 Index represents 100 of the largest non-financial U.S. and non-U.S. companies listed on the National Tier of the NASDAQ stock market. It is a modified capitalization-weighted index that is designed to limit domination by a few large stocks while generally retaining the ranking of companies by capitalization.

What was the investment backdrop during the period?   The first quarter saw the broader U.S. stock averages struggle unsuccessfully to remain above the break-even mark in the midst of widespread expectations for slower growth by the nation's economy and a reduction in corporate profits. On the fixed-income front, bond yields fell and prices rose in January, but fears of rising inflation later in the quarter reversed much of the advance. Additionally, there were two 0.25% hikes in short-term interest rates by the Federal Reserve (Fed) during the first three months of 2005. Turning to the second quarter, U.S. stocks traded indecisively, as moderately positive news on the economy and corporate earnings was tempered by high crude oil prices, rising short-term interest rates and concerns about slowing economic growth.

Broad-based U.S. stock indexes advanced in the third quarter, as favorable second quarter earnings boosted the market in July. In the bond space, longer-maturity yields rose in July on better-than-expected economic performance, then backed off as rising crude oil prices once again raised fears of a slowing economy. Stocks made upward progress in the fourth quarter, propelling many broad-based stock indexes into positive territory for full-year 2005. In the bond market, the yield curve – a measure of the disparity of yields of bonds of comparable credit quality across a range of maturities from three months to 30 years and used as an economic indicator – continued to flatten, due to the Fed's persistent upward pressure on short-term yields and the relatively flat movement of longer yields.

What factors contributed to the Fund's performance?   During the first quarter, all of the NASDAQ 100 Index's sectors posted negative returns. The information technology sector returned –6.60% for the period; consumer discretionary dropped 14.75%. Against the backdrop of high oil prices and two interest hikes by the Fed, the vast majority of U.S. equity indexes posted negative returns during the period. In the second quarter, the telecommunications services sector advanced with a gain of 11.42%. The information technology sector recovered somewhat from the first quarter, with its loss of only 0.09% at the mid-year point. Consumer discretionary also did better in the second quarter, with a return of –0.14%.

The NASDAQ 100 Index (the Index) finished the third quarter with a strong 7.33% advance. The greatest strength during the period came from the health care sector, which gained 16.62%. For the first time in 2005, the information technology sector, which accounts for over half of the Index, was in positive territory, with its 7.86% return. Similarly, consumer discretionary advanced for the first time during the year, with a 0.95% gain. During the final quarter of 2005, the Index advanced 2.84% – finishing the year with a 1.89% gain. A strong performance was seen in the consumer staples sector, which returned 15.19% for the fourth quarter. The large information technology sector advanced 2.21% for the period. Consumer discretionary, the second-largest sector in the Index, was also up for the quarter, with its 0.52% gain.

12

MML OTC 100 Fund – Portfolio Manager Report (Continued)

What is your outlook?   As we proceed into 2006, positive factors on the horizon include an economy that continues to grow more than expected, rebounding consumer confidence, muted inflation and interest rates that are still low by historical standards. Currently strong corporate balance sheets, forecasts for double-digit earnings growth in 2006 and moderate valuations also provide evidence of a positive outlook for the year. Conversely, cautionary factors include the possibility that consumer spending will weaken as home refinancing opportunities dry up, a historically challenging phase of the four-year presidential cycle and a market that has slowed its advance somewhat. In such an environment, investors are well served by focusing on proper asset allocation and an investment strategy that concentrates on the long term.

MML OTC 100 Fund Industry Table (% of Net Assets) on 12/31/05
Prepackaged Software	15.2	%
Electrical Equipment & Electronics	12.7	%
Pharmaceuticals	11.9	%
Computers & Information	11.7	%
Communications	9.7	%
Information Retrieval Services	5.9	%
Commercial Services	5.8	%
Retail	5.1	%
Food Retailers	2.2	%
Broadcasting, Publishing & Printing	2.1	%
Short-Term Investments and Other Assets and Liabilities	2.1	%
Computer Integrated Systems Design	1.5	%
Medical Supplies	1.5	%
Manufacturing	1.4	%
Transportation	1.2	%
Computer Programming Services	1.0	%
Healthcare	1.0	%
Automotive & Parts	0.9	%
Computer Related Services	0.9	%
Telephone Utilities	0.9	%
Data Processing & Preparation	0.7	%
Miscellaneous	0.7	%
Retail – Grocery	0.7	%
Advertising	0.6	%
Apparel, Textiles & Shoes	0.6	%
Travel	0.6	%
Energy	0.4	%
Lodging	0.4	%
Communications Equipment	0.3	%
Internet Content	0.3	%
Futures	0.0	%
	100.0	%

MML OTC 100 Fund
Largest Stock Holdings (12/31/05)

Microsoft Corp.

Qualcomm, Inc.

Apple Computer, Inc.

Intel Corp.

Google, Inc. Cl. A

Amgen

eBay, Inc.

Cisco Systems, Inc.

Starbucks Corp.

Yahoo!, Inc.

13

MML OTC 100 Fund – Portfolio Manager Report (Continued)

Growth of a $10,000 Investment

Hypothetical Investments in MML OTC 100 Fund and the NASDAQ 100 Index.

MML Series Investment Fund

Total Return	One Year 1/1/05 - 12/31/05			Five Year Average Annual 1/1/01 - 12/31/05			Since Inception Average Annual 5/1/00 - 12/31/05
MML OTC 100 Fund		1.26	%		–7.07	%		–14.06	%
NASDAQ 100 Index		1.49	%		–6.82	%		–13.63	%

GROWTH OF A $10,000 INVESTMENT SINCE INCEPTION

Performance data quoted represents past performance; past performance is not predictive of future results. The investment return and principal value of shares of the Fund will fluctuate with market conditions so that shares of the Fund, when redeemed, may be worth more or less than their original cost. Current performance of the Fund may be lower or higher than the performance quoted. Performance data current to the most recent month end may be obtained by accessing the website at www.massmutual.com.

Investors should note that the Fund is a professionally managed mutual fund, while the NASDAQ 100 Index is unmanaged and does not incur expenses, and cannot be purchased directly by investors. Investors should read the Fund's prospectus with regard to the Fund's investment objective, risks and charges and expenses in conjunction with these financial statements. The Fund's return reflects changes in the net asset value per share without the deduction of any product charges. Total return figures would be lower for the periods presented if they reflected these charges.

14

MML Small Cap Growth Equity Fund – Portfolio Manager Report

What is the investment objective of the MML Small Cap Growth Equity Fund?   This Fund seeks long-term capital appreciation by investing primarily in common stocks and equity securities of smaller companies the managers believe offer potential for long-term growth.

How did the Fund perform during the 12months ended December 31, 2005?   The Fund's shares returned 11.58%, outperforming the 4.55% return of the Russell 2000^® Index, a widely recognized, unmanaged index representative of common stocks of smaller capitalized U.S. companies.

What was the investment background during the period?   After registering positive returns in 2004, equity markets generally retreated in the first quarter of 2005 on concerns of rising interest rates, high oil prices and slowing earnings growth. In the second quarter, the market remained surprisingly resilient in the face of continued short-term interest rate increases, high energy prices and a slowing economy.

Entering the second half of the year, the U.S. small-cap equity market remained strong. Despite rising interest rates, two major hurricanes and high energy prices investors embraced solid corporate earnings and continued economic growth in the third quarter. In the final three months of the year, domestic equity markets showed signs of strength, as market participants were encouraged by retreating energy prices, waning inflationary pressures, and signs that the Federal Reserve (Fed) was nearing an end to its rate hikes.

What factors contributed to the Fund's performance – and how have you positioned the Fund as a result?   In the first quarter, the technology sector of the Russell 2000 Index (the Index) closed down almost 12%. Conversely, the energy sector was the top performer with its 14.6% gain, as oil-related stocks maintained their advantage on the tailwind of rising oil prices. We were underweight in these two volatile and cyclical groups, due to our ongoing focus on those sectors that, in our belief, yield stable profitability. During the first quarter, the Fund's favorable stock selection in the health care sector fueled performance, while our picks in the consumer discretionary sector detracted from results. In the second quarter, positive contributions came from the financials sector. Conversely, unfavorable stock selection in the consumer discreti onary and information technology sectors hampered the Fund's returns.

In the third quarter, the portfolio was helped in part by strong stock selection in financials and energy – and favorable picks within the information technology sector. These results were offset by unfavorable stock selection in the materials and information technology sectors – along with less-than-favorable choices in both the consumer discretionary and industrials sectors. At the end of the period, the portfolio was overweight in the health care sector and underweight in financials.

As 2005 came to a close, the Fund's overweight position in the consumer discretionary sector, and stronger-than-Index stock selection within that sector, contributed to performance. Solid stock picks in the financials, information technology, and industrials sectors also provided some lift in the fourth quarter. These results contrasted with weakness in several holdings within the consumer staples and health care sectors – and by unfavorable stock selection in the utilities sector. The Fund closed out the year in a similar fashion as the third quarter, with an overweight position in the health care sector and an underweight position in the financials space.

What is your outlook?   Although we expect the Fed to remain vigilant with respect to interest rates in the first half of 2006, we are optimistic about the economy's prospects for the year. We expect most sectors of the economy could progress without hesitation. In addition, although consumer spending remains fragile in the face of a slowing housing market, we still see strength in industrial demand and general business investment. We do, however, remain concerned that elevated interest rates and energy prices could still provide a tipping point for small cap's three-year-old recovery. For that reason, the attributes of quality continue to be our primary focus.

15

MML Small Cap Growth Equity Fund – Portfolio Manager Report (Continued)

MML Small Cap Growth Equity Fund Industry Table (% of Net Assets) on 12/31/05
Short-Term Investments and Other Assets and Liabilities	10.0	%
Commercial Services	8.9	%
Prepackaged Software	8.7	%
Healthcare	5.9	%
Energy	4.2	%
Pharmaceuticals	3.9	%
Financial Services	3.8	%
Electrical Equipment & Electronics	3.3	%
Transportation	3.2	%
Computers & Information	3.1	%
Banking, Savings & Loans	3.0	%
Computer Related Services	2.9	%
Medical Supplies	2.7	%
Insurance	2.5	%
Investment Management Services	2.5	%
Retail	2.3	%
Advertising	2.0	%
Data Processing & Preparation	2.0	%
Foods	1.9	%
Lodging	1.9	%
Air Transportation	1.7	%
Computer Integrated Systems Design	1.7	%
Automotive & Parts	1.3	%
Communications	1.3	%
Machinery & Components	1.3	%
Apparel, Textiles & Shoes	1.2	%
Computer Programming Services	1.2	%
Telephone Utilities	1.1	%
Building Materials & Construction	1.0	%
Entertainment & Leisure	1.0	%
Home Construction, Furnishings & Appliances	0.9	%
Broadcasting, Publishing & Printing	0.8	%
Chemicals	0.8	%
Heavy Machinery	0.8	%
Information Retrieval Services	0.8	%
Restaurants	0.8	%
Metals & Mining	0.7	%
Household Products	0.6	%
Oil & Gas	0.6	%
Electric Utilities	0.4	%
Real Estate	0.4	%
Computer Maintenance & Repair	0.3	%
Aerospace & Defense	0.2	%
Cosmetics & Personal Care	0.2	%
Manufacturing	0.2	%
Computer & Other Data Processing Service	0.0	%
	100	%

MML Small Cap Growth Equity Fund
Largest Stock Holdings (12/31/05)

iShares Russell 2000 Growth Index Fund

Checkfree Corp.

The Corporate Executive Board Co.

ITT Educational Services, Inc.

Factset Research Systems, inc.

Getty Images, Inc.

American Healthways, Inc.

Newfield Exploration Co.

MicroStratergy, Inc. Cl. A

Cerner Corp.

16

MML Small Cap Growth Equity Fund – Portfolio Manager Report (Continued)

Growth of a $10,000 Investment

Hypothetical Investments in MML Small Cap Growth Equity Fund and the Russell 2000 Index.

MML Series Investment Fund

Total Return	One Year 1/1/05 - 12/31/05			Five Year Average Annual 1/1/01 - 12/31/05			Since Inception Average Annual 5/3/99 - 12/31/05
MML Small Cap Growth Equity Fund		11.58	%		3.95	%		8.59	%
Russell 2000 Index		4.55	%		8.22	%		8.23	%

GROWTH OF A $10,000 INVESTMENT SINCE INCEPTION

Performance data quoted represents past performance; past performance is not predictive of future results. The investment return and principal value of shares of the Fund will fluctuate with market conditions so that shares of the Fund, when redeemed, may be worth more or less than their original cost. Current performance of the Fund may be lower or higher than the performance quoted. Performance data current to the most recent month end may be obtained by accessing the website at www.massmutual.com.

Investors should note that the Fund is a professionally managed mutual fund, while the Russell 2000 Index is unmanaged and does not incur expenses, and cannot be purchased directly by investors. Investors should read the Fund's prospectus with regard to the Fund's investment objective, risks and charges and expenses in conjunction with these financial statements. The Fund's return reflects changes in the net asset value per share without the deduction of any product charges. Total return figures would be lower for the periods presented if they reflected these charges.

17

MML Emerging Growth Fund – Portfolio Manager Report

What is the investment objective of the MML Emerging Growth Fund?   This Fund seeks capital appreciation by investing primarily in smaller, rapidly growing emerging companies – generally in industry segments experiencing rapid growth, and often including technology and technology-related concerns.

How did the Fund perform during the 12 months ended December 31, 2005?   The Fund's shares returned 0.84%, trailing the 4.55% return of the Russell 2000^® Index, a widely recognized, unmanaged index representative of common stocks of smaller capitalized U.S. companies.

What was the investment backdrop during the period?   The first quarter saw the broader U.S. stock averages struggle unsuccessfully to remain above the break-even mark in the midst of widespread expectations for slower growth by the nation's economy and a reduction in corporate profits. On the fixed-income front, bond yields fell and prices rose in January, but fears of rising inflation later in the quarter reversed much of the advance. Additionally, there were two 0.25% hikes in short-term interest rates by the Federal Reserve (Fed) during the first three months of 2005.

Turning to the second quarter, U.S. stocks traded indecisively, as moderately positive news on the economy and corporate earnings was tempered by high crude oil prices, rising short-term interest rates and concerns about slowing economic growth. In the bond market, Treasuries outperformed other fixed-income asset classes, while investment-grade bonds outpaced high-yield securities in the corporate sector.

Broad-based U.S. stock indexes advanced in the third quarter, as favorable second quarter earnings boosted the market in July. In the bond space, longer-maturity yields rose in July on better-than-expected economic performance, then backed off as rising crude oil prices once again raised fears of a slowing economy.

Stocks made upward progress in the fourth quarter, propelling many broad-based stock indexes into positive territory for full-year 2005. In the bond market, the yield curve – a measure of the disparity of yields of bonds of comparable credit quality across a range of maturities from three months to 30 years and used as an economic indicator – continued to flatten, due to persistent upward pressure on short-term yields by the Fed's credit-tightening and the relatively flat movement of longer-term yields.

What factors contributed to the Fund's performance – and how have you positioned the Fund as a result?   In the first quarter, the Fund's underperformance primarily came from sector corrections in biotechnology, Internet and technology. Conversely, our better-performing stocks came from broader sectors of the economy – such as retail, energy, medical devices, consumer, software and health care services. In the second quarter, favorable stock selection drove the Fund's performance, especially in the software space. Health care proved to be another productive area for the portfolio as we approached the mid-year mark, with biotechnology holdings providing some of the best returns. Although our retail positions turned in decent performance, the portfolio encountered performance weakness in some Internet holdings.

In the third quarter, energy price spikes and rising shorter-term interest rates caused the market to depress consumer-related stocks. We maintained an overweight position in technology and Internet stocks, on the belief that corporations have significantly under-invested in information technology. Conversely, we maintained an underweight position in financials, producer durables and basic materials – three non-emerging sectors that fueled benchmark performance in the past three years – but whose sustainability we began to question. Finally, in the fourth quarter, our Internet-related positions produced strong returns, as did one of our primary e-commerce positions. Detracting from results, however, were certain segments of health care, which dragged down our relative results, as a number of biotechnology and drug development positions fell sharply.

18

MML Emerging Growth Equity Fund – Portfolio Manager Report (Continued)

What is your outlook?   The consumer has driven the market for the past four years due to a rebounding economy and low interest rates. We believe that we are entering the later stages of an economic recovery, which tends to favor industries related to productivity spending and growth initiatives.

MML Emerging Growth Fund Industry Table (% of Net Assets) on 12/31/05
Commercial Services	12.8	%
Medical Supplies	8.8	%
Electrical Equipment & Electronics	8.5	%
Prepackaged Software	6.8	%
Healthcare	5.9	%
Computers & Information	5.5	%
Financial Services	5.2	%
Retail	4.2	%
Pharmaceuticals	3.9	%
Telephone Utilities	3.3	%
Communications	3.0	%
Short-Term Investments and Other Assets and Liabilities	3.0	%
Banking, Savings & Loans	2.9	%
Restaurants	2.7	%
Advertising	2.5	%
Transportation	2.1	%
Energy	1.9	%
Machinery & Components	1.9	%
Heavy Machinery	1.8	%
Insurance	1.8	%
Apparel, Textiles & Shoes	1.6	%
Computer Integrated Systems Design	1.5	%
Building Materials & Construction	1.2	%
Computer Related Services	1.2	%
Data Processing & Preparation	1.1	%
Internet Software	0.9	%
Air Transportation	0.6	%
Beverages	0.6	%
Foods	0.6	%
Information Retrieval Services	0.6	%
Home Construction, Furnishings & Appliances	0.5	%
Lodging	0.5	%
Computer Programming Services	0.4	%
Computer & Other Data Processing Service	0.2	%
Electric Utilites	0.0	%
	100.0	%

MML Emerging Growth Fund
Largest Stock Holdings (12/31/05)

M-Systems Flash Disk Pioneers Ltd.

California Pizza Kitchen, Inc.

Zumiez, Inc.

Bright Horizons Family Solutions, Inc.

j2 Global Communications, Inc.

MicroStratergy, Inc. Cl. A

AMN Healthcare Services, Inc.

Affiliated Managers Group, Inc.

Grant Prideco, Inc.

Matria Healthcare, Inc.

19

MML Emerging Growth Fund – Portfolio Manager Report (Continued)

Growth of a $10,000 Investment

Hypothetical Investments in MML Emerging Growth Fund and the Russell 2000 Index.

MML Series Investment Fund

Total Return	One Year 1/1/05 - 12/31/05			Five Year Average Annual 1/1/01 - 12/31/05			Since Inception Average Annual 5/1/00 - 12/31/05
MML Emerging Growth Fund		0.84	%		–4.07	%		–8.69	%
Russell 2000 Index		4.55	%		8.22	%		6.52	%

GROWTH OF A $10,000 INVESTMENT SINCE INCEPTION

Performance data quoted represents past performance; past performance is not predictive of future results. The investment return and principal value of shares of the Fund will fluctuate with market conditions so that shares of the Fund, when redeemed, may be worth more or less than their original cost. Current performance of the Fund may be lower or higher than the performance quoted. Performance data current to the most recent month end may be obtained by accessing the website at www.massmutual.com.

Investors should note that the Fund is a professionally managed mutual fund, while the Russell 2000 Index is unmanaged and does not incur expenses, and cannot be purchased directly by investors. Investors should read the Fund's prospectus with regard to the Fund's investment objective, risks and charges and expenses in conjunction with these financial statements. The Fund's return reflects changes in the net asset value per share without the deduction of any product charges. Total return figures would be lower for the periods presented if they reflected these charges.

20

MML Large Cap Value Fund – Portfolio of Investments

December 31, 2005

	Number of Shares		Market Value
EQUITIES — 93.5%
COMMON STOCK
Advertising — 0.3%
WPP Group PLC, Sponsored ADR (United Kingdom)		6,000	$	324,000
Automotive & Parts — 1.4%
Harley-Davidson, Inc.		35,500		1,827,895
Banking, Savings & Loans — 14.3%
Commerce Bancorp, Inc.(a)		19,400		667,554
Fifth Third Bancorp(a)		25,400		958,088
Golden West Financial Corp.(a)		65,100		4,296,600
HSBC Holdings PLC		214,427		3,451,064
JPMorgan Chase & Co.		137,516		5,458,010
Lloyds TSB Group PLC Sponsored ADR (United Kingdom)(a)		24,800		838,240
State Street Corp.		4,500		249,480
Wells Fargo & Co.		50,800		3,191,764
				19,110,800
Beverages — 1.5%
Diageo PLC Sponsored ADR (United Kingdom)		23,500		1,370,050
Heineken Holding NV Cl. A		23,250		682,716
				2,052,766
Broadcasting, Publishing & Printing — 3.6%
Comcast Corp. Special, Cl. A(b)		129,600		3,329,424
Gannett Co., Inc.		6,800		411,876
Lagardere S.C.A. SA		14,400		1,107,709
				4,849,009
Building Materials & Construction — 1.4%
Martin Marietta Materials, Inc.		12,700		974,344
Vulcan Materials Co.		12,800		867,200
				1,841,544
Commercial Services — 4.9%
Block (H&R), Inc.(a)		70,500		1,730,775
Cosco Pacific, Limited		164,000		299,392
Dun & Bradstreet Corp.(b)		11,450		766,692
Iron Mountain, Inc.(a) (b)		45,500		1,921,010
Moody's Corp.		30,500		1,873,310
				6,591,179

	Number of Shares		Market Value
Communications — 0.8%
Nokia Oyj Sponsored ADR (Finland)		17,700	$	323,910
NTL, Inc.(b)		4,300		292,744
SK Telecom Co., Ltd. ADR (South Korea)(a)		21,000		426,090
				1,042,744
Computer Related Services — 0.2%
IAC/InterActiveCorp(b)		9,850		278,853
Computers & Information — 1.6%
Dell, Inc.(b)		40,400		1,211,596
Lexmark International, Inc.(b)		21,600		968,328
				2,179,924
Computers & Office Equipment — 0.5%
Hewlett-Packard Co.		25,200		721,476
Containers — 2.2%
Sealed Air Corp.(a) (b)		53,100		2,982,627
Cosmetics & Personal Care — 0.8%
Avon Products, Inc.		37,700		1,076,335
Energy — 10.2%
ConocoPhillips		56,360		3,279,025
Devon Energy Corp.		51,600		3,227,064
EOG Resources, Inc.(a)		44,000		3,228,280
Occidental Petroleum Corp.		35,100		2,803,788
Transocean, Inc.(b)		16,500		1,149,885
				13,688,042
Financial Services — 13.6%
American Express Co.		120,100		6,180,346
Ameriprise Financial, Inc.		34,580		1,417,780
Berkshire Hathaway, Inc. Cl. A(b)		46		4,076,520
Centerpoint Properties Corp.(a)		40,400		1,998,992
Citigroup, Inc.		64,800		3,144,744
Morgan Stanley		14,100		800,034
Telewest Global, Inc.(b)		21,900		521,658
				18,140,074
Foods — 0.7%
The Hershey Co.		17,700		977,925
Healthcare — 3.1%
Caremark Rx, Inc.(b)		30,800		1,595,132
HCA, Inc.		50,900		2,570,450
				4,165,582

	Number of Shares		Market Value
Household Products — 0.1%
Hunter Douglas NV		3,203	$	174,215
Industrial - Diversified — 4.4%
Tyco International Ltd.		204,543		5,903,111
Insurance — 13.3%
American International Group, Inc.		96,050		6,553,491
Aon Corp.		29,300		1,053,335
Chubb Corp.		3,800		371,070
Loews Corp.		25,900		2,456,615
Markel Corp.(a) (b)		300		95,115
Marsh & McLennan Companies, Inc.		31,400		997,264
Principal Financial Group, Inc.		9,000		426,870
Progressive Corp.(a)		35,400		4,134,012
Sun Life Financial, Inc.(a)		5,600		224,728
Transatlantic Holdings, Inc.		20,800		1,397,760
				17,710,260
Pharmaceuticals — 1.1%
Cardinal Health, Inc.(a)		21,700		1,491,875
Prepackaged Software — 1.3%
Microsoft Corp.		64,400		1,684,060
Retail — 5.9%
Costco Wholesale Corp.(a)		108,700		5,377,389
Wal-Mart Stores, Inc.		52,600		2,461,680
				7,839,069
Tobacco — 4.9%
Altria Group, Inc.		87,600		6,545,472
Transportation — 1.2%
China Merchants Holdings International Co., Ltd.		190,000		411,797
Kuehne & Nagel International AG		1,400		394,575
United Parcel Service, Inc. Cl. B		10,500		789,075
				1,595,447
Travel — 0.2%
Expedia, Inc.(a) (b)		9,950		238,402
TOTAL EQUITIES (Cost $100,450,161)				125,032,686

(Continued)

The accompanying notes are an integral part of the financial statements.

21

MML Large Cap Value Fund – Portfolio of Investments (Continued)

	Principal Amount		Market Value
SHORT-TERM INVESTMENTS — 19.9%
Cash Equivalents — 13.5%(d)
Abbey National PLC Eurodollar Time Deposit 4.290% 01/11/2006	$	383,550	$	383,550
American Beacon Money Market Fund(c)		164,927		164,927
Bank of America 4.230% 01/20/2006		402,728		402,728
Bank of America 4.270% 01/17/2006		295,124		295,124
Bank of Montreal Eurodollar Time Deposit 4.300% 01/19/2006		767,102		767,102
Bank of Nova Scotia Eurodollar Time Deposit 4.250% 01/27/2006		383,551		383,551
Barclays Eurodollar Time Deposit 4.300% 01/31/2006		383,551		383,551
Barclays Eurodollar Time Deposit 4.313% 01/17/2006		393,815		393,815
Barclays Eurodollar Time Deposit 4.410% 02/27/2006		191,775		191,775
BGI Institutional Money Market Fund(c)		613,681		613,681
Branch Banker & Trust Eurodollar Time Deposit 4.260% 01/11/2006		191,775		191,775
Calyon Eurodollar Time Deposit 4.335% 02/06/2006		383,551		383,551
Dexia Group Eurodollar Time Deposit 4.230% 01/20/2006		383,551		383,551
Dexia Group Eurodollar Time Deposit 4.265% 01/27/2006		383,551		383,551
Federal Home Loan Bank Discount Note 4.186% 01/25/2006		229,109		229,109
First Tennessee National Corp. Eurodollar Time Deposit 4.290% 01/13/2006		767,102		767,102
Fortis Bank Eurodollar Time Deposit 4.280% 01/12/2006		383,551		383,551
Fortis Bank Eurodollar Time Deposit 4.300% 01/04/2006		383,551		383,551

	Principal Amount		Market Value
Fortis Bank Eurodollar Time Deposit 4.350% 01/03/2006	$	383,551	$	383,551
Freddie Mac Discount Note 4.234% 01/30/2006		308,009		308,009
General Electric Capital Corp. 4.274% 01/23/2006		762,755		762,755
Goldman Sachs Financial Square Prime Obligations Money Market Fund(c)		281,422		281,422
Merrimac Cash Fund, Premium Class(c)		61,368		61,368
Morgan Stanley Dean Witter & Co. 4.330% 01/13/2006		767,102		767,102
National Australia Bank Eurodollar Time Deposit 4.156% 01/03/2006		1,250,223		1,250,223
Rabobank Nederland Eurodollar Time Deposit 4.150% 01/03/2006		498,616		498,616
Rabobank Nederland Eurodollar Time Deposit 4.210% 01/19/2006		613,681		613,681
Royal Bank of Canada Eurodollar Time Deposit 4.220% 01/20/2006		191,775		191,775
Royal Bank of Canada Eurodollar Time Deposit 4.250% 01/24/2006		383,551		383,551
Royal Bank of Scotland Eurodollar Time Deposit 4.250% 01/23/2006		383,551		383,551
Royal Bank of Scotland Eurodollar Time Deposit 4.300% 01/31/2006		575,326		575,326
Skandinaviska Enskilda Banken AB Eurodollar Time Deposit (SEB) 4.230% 01/03/2006		191,775		191,775
Skandinaviska Enskilda Banken AB Eurodollar Time Deposit (SEB) 4.300% 01/17/2006		536,971		536,971
Societe Generale Eurodollar Time Deposit 4.280% 01/30/2006		383,551		383,551
Societe Generale Eurodollar Time Deposit 4.280% 01/31/2006		383,551		383,551

	Principal Amount		Market Value
Svenska Handlesbanken Eurodollar Time Deposit 4.100% 01/03/2006	$	437,716	$	437,716
The Bank of the West Eurodollar Time Deposit 4.290% 01/25/2006		613,681		613,681
Toronto Dominion Bank Eurodollar Time Deposit 4.300% 01/23/2006		383,551		383,551
UBS AG Eurodollar Time Deposit 4.255% 01/18/2006		191,775		191,775
UBS AG Eurodollar Time Deposit 4.260% 01/10/2006		383,551		383,551
Wells Fargo Eurodollar Time Deposit 4.270% 01/03/2006		322,183		322,183
Wells Fargo Eurodollar Time Deposit 4.300% 01/18/2006		767,102		767,102
				18,141,882
Repurchase Agreement — 6.4%
Investors Bank & Trust Company Repurchase Agreement, dated 12/30/2005, 3.02%, due 01/03/2006(e)		8,536,712		8,536,712
TOTAL SHORT-TERM INVESTMENTS (At Amortized Cost)				26,678,594
TOTAL INVESTMENTS — 113.4% (Cost $127,128,755)(f)				151,711,280
Other Assets/ (Liabilities) — (13.4%)				(17,954,815	)
NET ASSETS — 100.0%			$	133,756,465

Notes to Portfolio of Investments

ADR - American Depository Receipt

(a)  Denotes all or a portion of security on loan (Note 2).

(b)  Non-income producing security.

(c)  Amount represents shares owned of the fund.

(d)  Represents investments of security lending collateral. (Note 2).

(e)  Maturity value of $8,539,577. Collateralized by U.S. Government Agency obligation with a rate of 3.737%, maturity date of 06/01/2033, and aggregate market value, including accrued interest, of $8,963,548.

(f)  See Note 6 for aggregate cost for Federal tax purposes.

The accompanying notes are an integral part of the financial statements.

22

MML Equity Index Fund – Portfolio of Investments

December 31, 2005

	Number of Shares		Market Value
EQUITIES — 99.4%
COMMON STOCK
Advertising — 0.2%
Interpublic Group of Companies, Inc.(a) (b)		14,607	$	140,958
Monster Worldwide, Inc.(a) (b)		4,076		166,382
Omnicom Group, Inc.		6,506		553,856
				861,196
Aerospace & Defense — 2.2%
Boeing Co.		28,611		2,009,637
General Dynamics Corp.		6,907		787,743
Goodrich Corp.		4,139		170,113
Honeywell International, Inc.		29,290		1,091,052
Lockheed Martin Corp.		12,740		810,646
Northrop Grumman Corp.		12,390		744,763
Raytheon Co.		15,588		625,858
Rockwell Collins, Inc.		6,068		281,980
United Technologies Corp.		36,022		2,013,990
				8,535,782
Air Transportation — 0.1%
Southwest Airlines Co.		24,340		399,906
Apparel, Textiles & Shoes — 0.6%
Coach, Inc.(a)		13,000		433,420
Jones Apparel Group, Inc.		4,196		128,901
Limited Brands		12,130		271,105
Liz Claiborne, Inc.(b)		3,774		135,185
Nike, Inc. Cl. B		6,881		597,202
Nordstrom, Inc.		7,770		290,598
Reebok International Ltd.		2,056		119,721
The Gap, Inc.		20,345		358,886
VF Corp.		3,451		190,978
				2,525,996
Automotive & Parts — 0.6%
AutoNation, Inc.(a)		6,300		136,899
Cooper Tire & Rubber Co.(b)		2,346		35,941
Dana Corp.		5,303		38,076
Ford Motor Co.		63,467		489,965
General Motors Corp.(b)		19,830		385,099
Genuine Parts Co.		6,129		269,186
Harley-Davidson, Inc.		9,822		505,735
Navistar International Corp.(a)		2,474		70,806
Paccar, Inc.		6,083		421,126
The Goodyear Tire & Rubber Co.(a) (b)		6,165		107,148
				2,459,981

	Number of Shares		Market Value
Banking, Savings & Loans — 9.2%
AmSouth Bancorporation		12,559	$	329,171
Bank of America Corp.(b)		139,956		6,458,969
Bank of New York Co., Inc.		27,145		864,568
BB&T Corp.		18,783		787,196
Capital One Financial Corp.		10,000		864,000
Comerica, Inc.		6,069		344,476
Compass Bancshares, Inc.		3,800		183,502
Fannie Mae		33,776		1,648,607
Fifth Third Bancorp(b)		18,922		713,738
First Horizon National Corp.(b)		4,400		169,136
Freddie Mac		24,086		1,574,020
Golden West Financial Corp.		9,010		594,660
JP Morgan Chase & Co.		122,347		4,855,952
KeyCorp		14,310		471,228
M&T Bank Corp.		2,800		305,340
Marshall and Ilsley Corp.(b)		7,300		314,192
Mellon Financial Corp.		14,894		510,119
National City Corp.		19,998		671,333
North Fork Bancorporation, Inc.		16,550		452,808
Northern Trust Corp.		8,488		439,848
Regions Financial Corp.		16,270		555,783
SLM Corp.		14,542		801,119
Sovereign Bancorp, Inc.		12,877		278,401
State Street Corp.		11,722		649,868
SunTrust Banks, Inc.		12,390		901,496
Synovus Financial Corp.		10,963		296,111
U.S. Bancorp		63,532		1,898,971
Wachovia Corp.		54,951		2,904,710
Washington Mutual, Inc.		35,101		1,526,894
Wells Fargo & Co.		58,929		3,702,509
Zions Bancorp		3,193		241,263
				36,309,988
Beverages — 2.1%
Anheuser-Busch Companies, Inc.		26,787		1,150,770
Brown-Forman Corp. Cl. B		3,180		220,438
Coca-Cola Enterprises, Inc.		11,374		218,040
Constellation Brands, Inc. Cl. A(a)		6,800		178,364
Molson Coors Brewing Co. Cl. B		1,989		133,243
PepsiCo, Inc.		58,208		3,438,929
The Coca-Cola Co.		72,391		2,918,081
The Pepsi Bottling Group, Inc.		5,038		144,137
				8,402,002

	Number of Shares		Market Value
Broadcasting, Publishing & Printing — 2.4%
Clear Channel Communications, Inc.		18,549	$	583,366
Comcast Corp. Cl. A(a) (b)		76,718		1,991,599
Dow Jones & Co., Inc.		2,026		71,903
Gannett Co., Inc.		8,570		519,085
Knight Ridder, Inc.(b)		2,655		168,061
Meredith Corp.		1,744		91,281
New York Times Co. Cl. A(b)		5,065		133,969
The McGraw-Hill Companies, Inc.		13,060		674,288
The Scripps (E.W.) Co. Cl. A(b)		3,000		144,060
Time Warner, Inc.		163,508		2,851,580
Tribune Co.		9,509		287,742
Univision Communications, Inc. Cl. A(a)		8,100		238,059
Viacom, Inc. Cl. B		55,629		1,813,505
				9,568,498
Building Materials & Construction — 0.2%
Louisiana-Pacific Corp.(b)		3,856		105,924
Masco Corp.(b)		15,467		466,949
Vulcan Materials Co.(b)		3,510		237,802
				810,675
Chemicals — 1.4%
Air Products & Chemicals, Inc.		7,858		465,115
Dow Chemical Co.		33,768		1,479,714
Du Pont (E.I.) de Nemours & Co.		32,204		1,368,670
Eastman Chemical Co.		2,700		139,293
Engelhard Corp.		4,293		129,434
Hercules, Inc.(a)		4,006		45,268
International Flavors & Fragrances, Inc.		3,246		108,741
Monsanto Co.		9,185		712,113
PPG Industries, Inc.		5,989		346,763
Praxair, Inc.		11,264		596,541
Rohm & Haas Co.		5,040		244,037
				5,635,689
Commercial Services — 1.6%
Allied Waste Industries, Inc.(a) (b)		7,660		66,948
Apollo Group, Inc. Cl. A(a) (b)		5,188		313,666
Block (H&R), Inc.(b)		11,548		283,503
Cendant Corp.		36,442		628,624
Cintas Corp.(b)		4,790		197,252
Convergys Corp.(a)		4,916		77,919

(Continued)

The accompanying notes are an integral part of the financial statements.

23

MML Equity Index Fund – Portfolio of Investments (Continued)

	Number of Shares		Market Value
Donnelley (R.R.) & Sons Co.		7,622	$	260,749
eBay, Inc.(a)		39,823		1,722,345
Ecolab, Inc.		6,416		232,708
Equifax, Inc.		4,659		177,135
Fluor Corp.		2,927		226,140
Moody's Corp.		8,892		546,147
Paychex, Inc.		11,797		449,702
PerkinElmer, Inc.		4,408		103,852
Quest Diagnostics, Inc.		5,828		300,025
Robert Half International, Inc.		5,980		226,582
Ryder System, Inc.(b)		2,182		89,506
Waste Management, Inc.		19,753		599,504
				6,502,307
Communications — 1.1%
ADC Telecommunications, Inc.(a)		3,921		87,603
Andrew Corp.(a)		5,561		59,670
Avaya, Inc.(a)		15,876		169,397
Ciena Corp.(a)		19,241		57,146
Citizens Communications Co.		12,201		149,218
L-3 Communications Holdings, Inc.		3,800		282,530
Lucent Technologies, Inc.(a) (b)		152,879		406,658
Network Appliance, Inc.(a)		12,420		335,340
Qualcomm, Inc.		57,160		2,462,453
Scientific-Atlanta, Inc.		5,310		228,702
Tellabs, Inc.(a)		16,012		174,531
				4,413,248
Communications Equipment — 0.5%
Motorola, Inc.		86,209		1,947,461
Computer Integrated Systems Design — 0.4%
Autodesk, Inc.		8,080		347,036
Computer Sciences Corp.(a)		6,587		333,566
Parametric Technology Corp.(a)		9,034		55,107
Sun Microsystems, Inc.(a)		121,308		508,281
Teradyne, Inc.(a)		6,760		98,493
Unisys Corp.(a)		11,615		67,715
				1,410,198
Computer Programming Services — 0.0%
Mercury Interactive Corp.(a)		3,070		85,315
Computers & Information — 3.8%
Apple Computer, Inc.(a)		28,852		2,074,170

	Number of Shares		Market Value
Cisco Systems, Inc.(a)		214,073	$	3,664,930
Comverse Technology, Inc.(a)		6,822		181,397
Dell, Inc.(a)		83,847		2,514,572
EMC Corp.(a)		82,932		1,129,534
Gateway, Inc.(a)		12,490		31,350
International Business Machines Corp.		55,565		4,567,443
International Game Technology		12,016		369,852
Jabil Circuit, Inc.(a)		6,278		232,851
Lexmark International, Inc.(a)		4,097		183,669
Solectron Corp.(a)		33,581		122,906
Symbol Technologies, Inc.		8,760		112,303
				15,184,977
Computers & Office Equipment — 1.0%
Electronic Data Systems Corp.		17,771		427,215
Hewlett-Packard Co.		100,215		2,869,155
Pitney Bowes, Inc.		8,002		338,084
Xerox Corp.(a)		33,014		483,655
				4,118,109
Containers — 0.2%
Ball Corp.		3,920		155,702
Bemis Co., Inc.		3,666		102,135
Pactiv Corp.(a) (b)		5,159		113,498
Sealed Air Corp.(a) (b)		2,891		162,387
Temple-Inland, Inc.		3,876		173,839
				707,561
Cosmetics & Personal Care — 2.4%
Alberto-Culver Co.(b)		2,607		119,270
Avon Products, Inc.		16,356		466,964
Colgate-Palmolive Co.		17,977		986,038
Kimberly-Clark Corp.		16,507		984,643
The Procter & Gamble Co.		116,786		6,759,574
				9,316,489
Data Processing & Preparation — 0.8%
Affiliated Computer Services, Inc. Cl. A(a)		4,400		260,392
Automatic Data Processing, Inc.		20,104		922,573
First Data Corp.		26,933		1,158,388
Fiserv, Inc.(a)		6,721		290,818
IMS Health, Inc.		8,024		199,958
NCR Corp.(a)		6,500		220,610
				3,052,739
Electric Utilities — 3.0%
AES Corp.(a)		22,749		360,117
Allegheny Energy, Inc.(a)		5,020		158,883

	Number of Shares		Market Value
Ameren Corp.		6,481	$	332,086
American Electric Power Co.		13,757		510,247
CenterPoint Energy, Inc.(b)		11,063		142,160
Cinergy Corp.		6,563		278,665
CMS Energy Corp.(a) (b)		6,938		100,670
Consolidated Edison, Inc.		8,450		391,488
Constellation Energy Group, Inc.		5,925		341,280
Dominion Resources, Inc.		11,878		916,982
DTE Energy Co.		6,037		260,738
Duke Energy Corp.(b)		32,135		882,106
Edison International		11,430		498,462
Entergy Corp.		7,460		512,129
Exelon Corp.(b)		23,336		1,240,075
FirstEnergy Corp.		11,557		566,177
FPL Group, Inc.		13,772		572,364
NiSource, Inc.		9,346		194,958
PG&E Corp.		11,921		442,508
Pinnacle West Capital Corp.(b)		3,200		132,320
PPL Corp.		13,178		387,433
Progress Energy, Inc.(b)		8,672		380,874
Public Service Enterprise Group, Inc.		8,598		558,612
Southern Co.(b)		25,787		890,425
Teco Energy, Inc.		7,261		124,744
TXU Corp.		16,754		840,883
				12,017,386
Electrical Equipment & Electronics — 6.8%
Advanced Micro Devices, Inc.(a)		14,360		439,416
Altera Corp.(a) (b)		12,920		239,408
American Power Conversion Corp.		6,630		145,860
Analog Devices, Inc.		12,970		465,234
Applied Micro Circuits Corp.(a)		10,300		26,471
Broadcom Corp. Cl. A(a)		10,098		476,121
Emerson Electric Co.		14,557		1,087,408
Freescale Semiconductor, Inc. Cl. B(a)		13,525		340,424
General Electric Co.		369,335		12,945,192
Intel Corp.		212,287		5,298,684
JDS Uniphase Corp.(a)		49,988		117,972
Johnson Controls, Inc.		6,650		484,851
Kla-Tencor Corp.(b)		6,806		335,740
Linear Technology Corp.		10,630		383,424
LSI Logic Corp.(a) (b)		13,428		107,424
Maxim Integrated Products, Inc.		11,260		408,062
Micron Technology, Inc.(a) (b)		21,217		282,398

(Continued)

The accompanying notes are an integral part of the financial statements.

24

MML Equity Index Fund – Portfolio of Investments (Continued)

	Number of Shares		Market Value
Molex, Inc.(b)		5,090	$	132,085
National Semiconductor Corp.		12,396		322,048
Novellus Systems, Inc.(a)		4,850		116,982
Nvidia Corp.(a)		5,800		212,048
PMC-Sierra, Inc.(a)		6,189		47,717
Qlogic Corp.(a)		3,200		104,032
Rockwell Automation, Inc.		6,368		376,731
Sanmina-SCI Corp.(a)		18,052		76,902
Texas Instruments, Inc.		56,926		1,825,617
Xilinx, Inc.(b)		12,111		305,318
				27,103,569
Energy — 9.3%
Amerada Hess Corp.		2,753		349,135
Anadarko Petroleum Corp.		8,322		788,510
Apache Corp.		11,400		781,128
Ashland, Inc.		2,503		144,924
BJ Services Co.		11,200		410,704
Burlington Resources, Inc.		13,300		1,146,460
Chevron Corp.		78,466		4,454,515
ConocoPhillips		48,528		2,823,359
Devon Energy Corp.		15,770		986,256
Dynegy, Inc., Cl A(a) (b)		10,027		48,531
El Paso Corp.(b)		22,246		270,511
EOG Resources, Inc.		8,400		616,308
Exxon Mobil Corp.		216,836		12,179,678
Halliburton Co.(b)		17,365		1,075,935
Kerr-McGee Corp.		3,813		346,449
KeySpan Corp.		5,580		199,150
Kinder Morgan, Inc.		3,390		311,710
Marathon Oil Corp.		12,596		767,978
Murphy Oil Corp.		5,700		307,743
Nabors Industries Ltd.(a)		5,215		395,036
National Oilwell Varco, Inc.(a)		6,200		388,740
Nicor, Inc.(b)		1,489		58,533
Noble Corp.(b)		4,740		334,360
Occidental Petroleum Corp.		13,804		1,102,664
Peoples Energy Corp.(b)		1,257		44,083
Rowan Companies, Inc.		3,721		132,616
Schlumberger Ltd.(b)		20,439		1,985,649
Sempra Energy(b)		8,117		363,966
Sunoco, Inc.(b)		4,786		375,127
The Williams Companies, Inc.		19,218		445,281
Transocean, Inc.(a)		11,527		803,317
Valero Energy Corp.		21,400		1,104,240
Weatherford International Ltd.(a)		11,538		417,676
Xcel Energy, Inc.(b)		14,172		261,615
XTO Energy, Inc.		12,299		540,418
				36,762,305

	Number of Shares		Market Value
Entertainment & Leisure — 0.9%
Brunswick Corp.		3,239	$	131,698
Harrah's Entertainment, Inc.		6,623		472,154
News Corp., Inc. Cl. A		85,700		1,332,635
The Walt Disney Co.		67,031		1,606,733
				3,543,220
Financial Services — 6.2%
American Express Co.		43,108		2,218,338
Ameriprise Financial, Inc.		8,622		353,486
Apartment Investment & Management Co. Cl. A(b)		3,400		128,758
Archstone-Smith Trust		6,800		284,852
Bear Stearns Companies, Inc.		3,958		457,268
CIT Group, Inc.		7,300		377,994
Citigroup, Inc.		176,290		8,555,354
Countrywide Financial Corp.		20,854		712,998
E*TRADE Financial Corp.(a)		12,900		269,094
Federated Investors, Inc. Cl. B		3,000		111,120
Franklin Resources, Inc.		5,228		491,484
Huntington Bancshares, Inc.(b)		8,234		195,558
Janus Capital Group, Inc.		8,150		151,834
Lehman Brothers Holdings, Inc.		9,472		1,214,026
MBNA Corp.		43,521		1,182,030
Merrill Lynch & Co., Inc.		32,169		2,178,806
Morgan Stanley		37,591		2,132,913
PNC Financial Services Group, Inc.		9,949		615,147
Price (T. Rowe) Group, Inc.		4,400		316,932
Public Storage, Inc.		2,900		196,388
The Charles Schwab Corp.		36,561		536,350
The Goldman Sachs Group, Inc.		15,709		2,006,196
				24,686,926
Food Retailers — 0.2%
Starbucks Corp.(a)		26,898		807,209
Foods — 1.5%
Archer-Daniels-Midland Co.		21,661		534,160
Campbell Soup Co.		6,502		193,565
ConAgra Foods, Inc.		17,772		360,416
General Mills, Inc.		12,608		621,827
Heinz (H. J.) Co.		12,122		408,754
Kellogg Co.		9,164		396,068
McCormick & Co., Inc.		4,700		145,324
Safeway, Inc.(b)		15,460		365,784
Sara Lee Corp.		27,165		513,418
SuperValu, Inc.		4,621		150,090
Sysco Corp.		22,130		687,136

	Number of Shares		Market Value
The Hershey Co.		6,444	$	356,031
The Kroger Co.(a)		25,518		481,780
Tyson Foods, Inc. Cl. A(b)		8,700		148,770
Wrigley (Wm.) Jr. Co.		6,334		421,148
				5,784,271
Forest Products & Paper — 0.4%
International Paper Co.(b)		17,189		577,722
MeadWestvaco Corp.		6,301		176,617
Plum Creek Timber Co., Inc.(b)		6,500		234,325
Weyerhaeuser Co.		8,590		569,861
				1,558,525
Healthcare — 1.5%
Caremark Rx, Inc.(a)		15,700		813,103
Coventry Health Care, Inc.(a)		5,385		306,730
Express Scripts, Inc.(a)		5,200		435,760
HCA, Inc.		11,661		588,880
Health Management Associates, Inc. Cl. A		8,500		186,660
Humana, Inc.(a)		5,503		298,978
Laboratory Corp. of America Holdings(a) (b)		4,800		258,480
Manor Care, Inc.		3,032		120,583
Tenet Healthcare Corp.(a)		16,259		124,544
UnitedHealth Group, Inc.		47,680		2,962,835
				6,096,553
Home Construction, Furnishings & Appliances — 0.5%
Centex Corp.(b)		4,346		310,696
D.R. Horton, Inc.		9,400		335,862
KB Home		2,842		206,500
Leggett & Platt, Inc.(b)		6,650		152,684
Lennar Corp. Cl. A		4,700		286,794
Maytag Corp.		2,786		52,433
Pulte Homes, Inc.		7,544		296,932
Whirlpool Corp.(b)		2,309		193,402
				1,835,303
Household Products — 0.6%
Black & Decker Corp.(b)		2,850		247,836
Corning, Inc.(a)		52,191		1,026,075
Fortune Brands, Inc.		4,980		388,540
Newell Rubbermaid, Inc.		9,535		226,742
Sherwin-Williams Co.		3,929		178,455
Snap-on, Inc.(b)		2,153		80,867
The Clorox Co.		5,270		299,810
The Stanley Works		2,505		120,340
				2,568,665

(Continued)

The accompanying notes are an integral part of the financial statements.

25

MML Equity Index Fund – Portfolio of Investments (Continued)

	Number of Shares		Market Value
Industrial - Distribution — 0.1%
Grainger (W.W.), Inc.		2,879	$	204,697
Industrial - Diversified — 1.6%
3M Co.		26,672		2,067,080
Cooper Industries Ltd. Cl. A		3,214		234,622
Danaher Corp.		8,410		469,110
Eaton Corp.		5,294		355,174
Illinois Tool Works, Inc.(b)		7,319		643,999
ITT Industries, Inc.		3,237		332,828
Textron, Inc.		4,732		364,269
Tyco International Ltd.		70,774		2,042,538
				6,509,620
Information Retrieval Services — 0.4%
Yahoo!, Inc.(a)		44,016		1,724,547
Insurance — 5.9%
ACE Ltd.		10,000		534,400
Aetna, Inc.		10,022		945,175
AFLAC, Inc.		17,520		813,278
Allstate Corp.		23,104		1,249,233
Ambac Financial Group, Inc.		3,875		298,608
American International Group, Inc.		90,432		6,170,175
Aon Corp.		11,046		397,104
Chubb Corp.		6,673		651,618
Cigna Corp.		4,640		518,288
Cincinnati Financial Corp.		5,782		258,340
Genworth Financial, Inc. Cl. A		13,100		452,998
Jefferson-Pilot Corp.		4,720		268,710
Lincoln National Corp.		6,041		320,354
Loews Corp.		4,758		451,296
Marsh & McLennan Companies, Inc.		18,342		582,542
MBIA, Inc.(b)		4,975		299,296
Metlife, Inc.		26,132		1,280,468
MGIC Investment Corp.(b)		3,489		229,646
Principal Financial Group, Inc.		10,136		480,750
Progressive Corp.(b)		6,848		799,709
Prudential Financial, Inc.		18,100		1,324,739
Safeco Corp.		4,559		257,584
St. Paul Travelers Companies		23,963		1,070,427
The Hartford Financial Services Group, Inc.		10,258		881,060
Torchmark Corp.		3,726		207,166
UnumProvident Corp.(b)		10,270		233,643
WellPoint, Inc.(a)		23,038		1,838,202
XL Capital Ltd. Cl. A		6,027		406,099
				23,220,908

	Number of Shares		Market Value
Lodging — 0.3%
Hilton Hotels Corp.		11,491	$	277,048
Marriott International, Inc. Cl. A		5,964		399,409
Starwood Hotels & Resorts Worldwide, Inc.		7,140		455,960
				1,132,417
Machinery & Components — 1.0%
Baker Hughes, Inc.		11,598		704,926
Caterpillar, Inc.		23,404		1,352,049
Cummins, Inc.(b)		1,539		138,094
Deere & Co.		8,343		568,242
Dover Corp.		7,235		292,945
Ingersoll-Rand Co. Cl. A		11,966		483,067
Pall Corp.		4,492		120,655
Parker Hannifin Corp.		4,214		277,955
				3,937,933
Manufacturing — 0.4%
American Standard Companies, Inc.		6,300		251,685
Applied Materials, Inc.		57,006		1,022,688
Avery Dennison Corp.(b)		3,828		211,574
Millipore Corp.(a) (b)		1,715		113,259
				1,599,206
Medical Supplies — 2.4%
Agilent Technologies, Inc.(a)		14,283		475,481
Allergan, Inc.		4,707		508,168
Applera Corp. - Applied Biosystems Group		6,738		178,961
Bard (C.R.), Inc.		3,620		238,630
Bausch & Lomb, Inc.		1,892		128,467
Baxter International, Inc.		21,292		801,644
Becton, Dickinson & Co.		8,748		525,580
Biomet, Inc.		8,755		320,170
Boston Scientific Corp.(a)		20,772		508,706
Fisher Scientific International, Inc.(a)		4,100		253,626
Guidant Corp.		11,288		730,898
Medtronic, Inc.		42,181		2,428,360
Patterson Cos, Inc.(a)		4,800		160,320
St. Jude Medical, Inc.(a)		12,944		649,789
Stryker Corp.		10,200		453,186
Tektronix, Inc.		3,120		88,015
Thermo Electron Corp.(a)		5,554		167,342
Waters Corp.(a)		4,200		158,760
Zimmer Holdings, Inc.(a)		8,522		574,724
				9,350,827

	Number of Shares		Market Value
Metals & Mining — 0.8%
Alcoa, Inc.		30,088	$	889,702
Allegheny Technologies, Inc.		3,144		113,436
Freeport-McMoRan Copper & Gold, Inc. Cl. B		6,233		335,335
Newmont Mining Corp.		15,309		817,501
Nucor Corp.		5,528		368,828
Phelps Dodge Corp.		3,285		472,613
United States Steel Corp.		3,954		190,069
				3,187,484
Pharmaceuticals — 8.5%
Abbott Laboratories		54,098		2,133,084
AmerisourceBergen Corp.(b)		7,352		304,373
Amgen, Inc.(a)		43,006		3,391,453
Biogen Idec, Inc.(a)		12,037		545,637
Bristol-Myers Squibb Co.		68,442		1,572,797
Cardinal Health, Inc.		14,869		1,022,244
Chiron Corp.(a)		3,860		171,616
Eli Lilly & Co.(b)		39,595		2,240,681
Forest Laboratories, Inc.(a)		11,780		479,210
Genzyme Corp.(a)		8,900		629,942
Gilead Sciences, Inc.(a)		15,744		828,607
Hospira, Inc.(a)		5,439		232,680
Johnson & Johnson		103,596		6,226,120
King Pharmaceuticals, Inc.(a)		8,867		150,030
McKesson Corp.		10,587		546,183
Medco Health Solutions, Inc.(a)		10,420		581,436
MedImmune, Inc.(a)		8,564		299,911
Merck & Co., Inc.		77,015		2,449,847
Mylan Laboratories, Inc.		7,524		150,179
Pfizer, Inc.		256,741		5,987,200
Schering-Plough Corp.		51,588		1,075,610
Sigma-Aldrich Corp.		2,384		150,883
Watson Pharmaceutical, Inc.(a)		3,970		129,065
Wyeth		46,756		2,154,049
				33,452,837
Photography Equipment/Supplies — 0.1%
Eastman Kodak Co.(b)		9,960		233,064
Prepackaged Software — 3.4%
Adobe Systems, Inc.		20,812		769,212
BMC Software, Inc.(a)		8,065		165,252
Citrix Systems, Inc.(a)		6,092		175,328
Computer Associates International, Inc.		16,423		462,964
Compuware Corp.(a)		13,878		124,486
Electronic Arts, Inc.(a)		10,600		554,486
Intuit, Inc.(a)		6,610		352,313

(Continued)

The accompanying notes are an integral part of the financial statements.

26

MML Equity Index Fund – Portfolio of Investments (Continued)

	Number of Shares		Market Value
Microsoft Corp.		320,987	$	8,393,810
Novell, Inc.(a)		13,976		123,408
Oracle Corp.(a)		132,561		1,618,570
Siebel Systems, Inc.		18,118		191,688
Symantec Corp.(a)		37,889		663,058
				13,594,575
Real Estate — 0.5%
Equity Office Properties Trust		14,160		429,473
Equity Residential REIT(b)		9,900		387,288
ProLogis		8,500		397,120
Simon Property Group, Inc. REIT		6,400		490,432
Vornado Realty Trust		4,100		342,227
				2,046,540
Restaurants — 0.6%
Darden Restaurants, Inc.		4,692		182,425
McDonald's Corp.		43,877		1,479,532
Wendy's International, Inc.		3,975		219,659
Yum! Brands, Inc.		10,198		478,082
				2,359,698
Retail — 5.0%
Amazon.com, Inc.(a) (b)		9,633		454,196
AutoZone, Inc.(a)		1,954		179,280
Bed Bath & Beyond, Inc.(a)		10,450		377,768
Best Buy Co., Inc.		14,495		630,243
Big Lots, Inc.(a) (b)		3,874		46,527
Circuit City Stores, Inc.		5,700		128,763
Costco Wholesale Corp.(b)		16,342		808,439
CVS Corp.		27,606		729,351
Dillards, Inc. Cl. A		3,001		74,485
Dollar General Corp.		11,314		215,758
Family Dollar Stores, Inc.		5,951		147,525
Federated Department Stores, Inc.		9,050		600,287
J.C. Penney Co., Inc.(b)		8,909		495,340
Kohl's Corp.(a)		11,523		560,018
Lowe's Companies, Inc.(b)		27,182		1,811,952
Office Depot, Inc.(a)		10,765		338,021
OfficeMax, Inc.		2,442		61,929
RadioShack Corp.		4,681		98,441
Sears Holdings Corp.(a) (b)		3,708		428,385
Staples, Inc.		25,759		584,987
Target Corp.		30,568		1,680,323
The Home Depot, Inc.		74,937		3,033,450
Tiffany & Co.		4,992		191,144
TJX Companies, Inc.		16,676		387,383
Walgreen Co.		35,304		1,562,555
Wal-Mart Stores, Inc.		87,034		4,073,191
				19,699,741

	Number of Shares		Market Value
Retail - Grocery — 0.2%
Albertson's, Inc.(b)		12,747	$	272,148
Whole Foods Market, Inc.		4,800		371,472
				643,620
Telephone Utilities — 3.0%
Alltel Corp.		13,208		833,425
AT&T, Inc.		137,834		3,375,555
BellSouth Corp.		62,820		1,702,422
CenturyTel, Inc.		4,931		163,512
Qwest Communications International, Inc.(a) (b)		53,558		302,603
Sprint Nextel Corp.		102,859		2,402,786
Verizon Communications, Inc.		96,876		2,917,905
				11,698,208
Tobacco — 1.5%
Altria Group, Inc.		72,354		5,406,291
Reynolds American, Inc.(b)		3,000		285,990
UST, Inc.		6,022		245,878
				5,938,159
Toys, Games — 0.1%
Hasbro, Inc.		6,191		124,934
Mattel, Inc.		14,489		229,216
				354,150
Transportation — 1.9%
Burlington Northern Santa Fe Corp.		12,993		920,164
Carnival Corp.		15,185		811,942
CSX Corp.		7,465		378,998
FedEx Corp.		10,503		1,085,905
Norfolk Southern Corp.		13,689		613,678
Union Pacific Corp.		9,217		742,061
United Parcel Service, Inc. Cl. B		38,500		2,893,275
				7,446,023
Travel — 0.0%
Sabre Holdings Corp.		4,731		114,064
TOTAL EQUITIES (Cost $348,427,246)				393,460,367

	Principal Amount		Market Value
SHORT-TERM INVESTMENTS — 8.3%
Cash Equivalents — 7.9%(e)
Abbey National PLC Eurodollar Time Deposit 4.290% 01/11/2006	$	658,113	$	658,113
American Beacon Money Market Fund(d)		282,988		282,988
Bank of America 4.230% 01/20/2006		691,019		691,019
Bank of America 4.270% 01/17/2006		506,387		506,387
Bank of Montreal Eurodollar Time Deposit 4.300% 01/19/2006		1,316,226		1,316,226
Bank of Nova Scotia Eurodollar Time Deposit 4.250% 01/27/2006		658,113		658,113
Barclays 4.313% 01/17/2006		675,724		675,724
Barclays Eurodollar Time Deposit 4.300% 01/31/2006		658,112		658,112
Barclays Eurodollar Time Deposit 4.410% 02/27/2006		329,056		329,056
BGI Institutional Money Market Fund(d)		1,052,980		1,052,980
Branch Banker & Trust Eurodollar Time Deposit 4.260% 01/11/2006		329,056		329,056
Calyon Eurodollar Time Deposit 4.335% 02/06/2006		658,112		658,112
Dexia Group Eurodollar Time Deposit 4.230% 01/20/2006		658,112		658,112
Dexia Group Eurodollar Time Deposit 4.265% 01/27/2006		658,112		658,112
Federal Home Loan Bank Discount Note 4.186% 01/25/2006		393,114		393,114
First Tennessee National Corp. Eurodollar Time Deposit 4.290% 01/13/2006		1,316,225		1,316,225
Fortis Bank Eurodollar Time Deposit 4.280% 01/12/2006		658,112		658,112
Fortis Bank Eurodollar Time Deposit 4.300% 01/04/2006		658,112		658,112

(Continued)

The accompanying notes are an integral part of the financial statements.

27

MML Equity Index Fund – Portfolio of Investments (Continued)

	Principal Amount		Market Value
Fortis Bank Eurodollar Time Deposit 4.350% 01/03/2006	$	658,112	$	658,112
Freddie Mac Discount Note 4.234% 01/30/2006		528,494		528,494
General Electric Capital Corp. 4.274% 01/23/2006		1,308,766		1,308,766
Goldman Sachs Financial Square Prime Obligations Money Market Fund(d)		482,875		482,875
Merrimac Cash Fund, Premium Class(d)		105,298		105,298
Morgan Stanley Dean Witter & Co. 4.330% 01/13/2006		1,316,225		1,316,225
National Australia Bank Eurodollar Time Deposit 4.156% 01/03/2006		2,145,185		2,145,185
Rabobank Nederland Eurodollar Time Deposit 4.150% 01/03/2006		855,546		855,546
Rabobank Nederland Eurodollar Time Deposit 4.210% 01/19/2006		1,052,980		1,052,980
Royal Bank of Canada Eurodollar Time Deposit 4.220% 01/20/2006		329,056		329,056
Royal Bank of Canada Eurodollar Time Deposit 4.250% 01/24/2006		658,112		658,112
Royal Bank of Scotland Eurodollar Time Deposit 4.250% 01/23/2006		658,112		658,112
Royal Bank of Scotland Eurodollar Time Deposit 4.300% 01/31/2006		987,168		987,168
Skandinaviska Enskilda Banken AB (SEB) Eurodollar Time Deposit 4.230% 01/03/2006		329,056		329,056
Skandinaviska Enskilda Banken AB (SEB) Eurodollar Time Deposit 4.300% 01/17/2006		921,357		921,357
Societe Generale Eurodollar Time Deposit 4.280% 01/30/2006		658,112		658,112
Societe Generale Eurodollar Time Deposit 4.280% 01/31/2006		658,112		658,112
Svenska Handlesbanken Eurodollar Time Deposit 4.100% 01/03/2006		751,050		751,050

	Principal Amount		Market Value
The Bank of the West Eurodollar Time Deposit 4.290% 01/25/2006	$	1,052,980	$	1,052,980
Toronto Dominion Bank Eurodollar Time Deposit 4.300% 01/23/2006		658,112		658,112
UBS AG Eurodollar Time Deposit 4.255% 01/18/2006		329,056		329,056
UBS AG Eurodollar Time Deposit 4.260% 01/10/2006		658,112		658,112
Wells Fargo Eurodollar Time Deposit 4.270% 01/03/2006		552,814		552,814
Wells Fargo Eurodollar Time Deposit 4.300% 01/18/2006		1,316,225		1,316,225
				31,128,588
Repurchase Agreement — 0.3%
Investors Bank & Trust Company Repurchase Agreement, dated 12/30/05, 3.02%, due 01/03/2006(f)		1,401,383		1,401,383
U.S. Treasury Bills — 0.1%
U.S. Treasury Bill(c) 3.938% 04/06/2006		385,000		380,436
TOTAL SHORT-TERM INVESTMENTS (Cost $32,910,929)				32,910,407
TOTAL INVESTMENTS — 107.7% (Cost $381,338,175)(g)				426,370,774
Other Assets/ (Liabilities) — (7.7%)				(30,673,724	)
NET ASSETS — 100.0%			$	395,697,050

Notes to Portfolio of Investments

REIT - Real Estate Investment Trust

(a)  Non-income producing security.

(b)  Denotes all or a portion of security on loan (Note 2).

(c)  This security is held as collateral for open futures contracts (Note 2).

(d)  Amount represents shares owned of the fund.

(e)  Represents investments of security lending collateral. (Note 2).

(f)  Maturity value of $1,401,854. Collateralized by U.S. Government Agency obligation with a rate of 7.625%, maturity date of 07/25/2027, and an aggregate market value, including accrued interest, of $1,471,453.

(g)  See Note 6 for aggregate cost for Federal tax purposes.

The accompanying notes are an integral part of the financial statements.

28

MML Growth Equity Fund – Portfolio of Investments

December 31, 2005

	Number of Shares		Market Value
EQUITIES — 97.0%
COMMON STOCK
Advertising — 0.2%
Getty Images, Inc.(a) (b)		400	$	35,708
Aerospace & Defense — 1.1%
Goodrich Corp.		1,300		53,430
Lockheed Martin Corp.		2,600		165,438
Rockwell Collins, Inc.		500		23,235
				242,103
Air Transportation — 0.3%
AMR Corp.(a) (b)		3,000		66,690
Apparel, Textiles & Shoes — 1.6%
American Eagle Outfitters, Inc.		1,700		39,066
bebe stores, Inc.		2,400		33,672
Chico's FAS, Inc.(a)		1,800		79,074
Coach, Inc.(a)		1,100		36,674
Columbia Sportswear Co.(a) (b)		500		23,865
Nike, Inc. Cl. B		300		26,037
Nordstrom, Inc.		2,600		97,240
Urban Outfitters, Inc.(a) (b)		600		15,186
				350,814
Automotive & Parts — 0.7%
Harley-Davidson, Inc.(b)		2,400		123,576
Oshkosh Truck Corp.		500		22,295
				145,871
Banking, Savings & Loans — 1.4%
Fannie Mae		5,900		287,979
Beverages — 1.2%
PepsiCo, Inc.		4,400		259,952
Broadcasting, Publishing & Printing — 0.4%
Cablevision Systems Corp. Cl. A(a) (b)		1,500		35,205
The McGraw-Hill Companies, Inc.		1,000		51,630
				86,835
Commercial Services — 1.3%
eBay, Inc.(a)		600		25,950
Global Payments, Inc.		400		18,644
Jacobs Engineering Group, Inc.(a)		400		27,148
Moody's Corp.		400		24,568
Paychex, Inc.		1,600		60,992

	Number of Shares		Market Value
Pharmaceutical Product Development, Inc.		810	$	50,180
Rent-A-Center, Inc.(a)		2,300		43,378
Robert Half International, Inc.		500		18,945
				269,805
Communications — 0.4%
Harris Corp.		1,900		81,719
Communications Equipment — 1.9%
Motorola, Inc.		17,700		399,843
Computer Integrated Systems Design — 0.3%
Autodesk, Inc.		1,300		55,835
Computer Programming Services — 0.1%
Cognizant Technology Solutions Corp.(a)		600		30,210
Computer Related Services — 0.2%
CNET Networks, Inc.(a) (b)		1,700		24,973
Ingram Micro, Inc. Cl. A(a)		1,100		21,923
				46,896
Computers & Information — 6.6%
Apple Computer, Inc.(a)		2,400		172,536
Dell, Inc.(a)		25,300		758,747
EMC Corp.(a)		3,700		50,394
Emulex Corp.(a)		700		13,853
International Business Machines Corp.		3,000		246,600
Lexmark International, Inc.(a)		1,000		44,830
Western Digital Corp.(a)		5,700		106,077
				1,393,037
Cosmetics & Personal Care — 0.5%
The Procter & Gamble Co.		2,000		115,760
Data Processing & Preparation — 2.2%
Affiliated Computer Services, Inc. Cl. A(a)		1,000		59,180
Alliance Data Systems Corp.(a) (b)		700		24,920
First Data Corp.		7,200		309,672
Fiserv, Inc.(a)		1,200		51,924
Total System Services, Inc.		1,100		21,769
				467,465
Electric Utilities — 0.2%
TXU Corp.		1,000		50,190

	Number of Shares		Market Value
Electrical Equipment & Electronics — 9.4%
American Power Conversion Corp.		1,400	$	30,800
Broadcom Corp. Cl. A(a)		600		28,290
General Electric Co.		2,300		80,615
Intel Corp.		43,500		1,085,760
International Rectifier Corp.(a)		700		22,330
Johnson Controls, Inc.		200		14,582
National Semiconductor Corp.		900		23,382
Nvidia Corp.(a) (b)		1,900		69,464
Rockwell Automation, Inc.		1,100		65,076
Texas Instruments, Inc.(b)		18,000		577,260
				1,997,559
Energy — 5.6%
BJ Services Co.		1,200		44,004
Burlington Resources, Inc.		2,000		172,400
EOG Resources, Inc.		3,800		278,806
Exxon Mobil Corp.		4,200		235,914
Frontier Oil Corp.		700		26,271
Halliburton Co.(b)		1,500		92,940
Helmerich & Payne, Inc.		400		24,764
Kinder Morgan, Inc.		1,800		165,510
Patterson-UTI Energy, Inc.		1,900		62,605
Questar Corp.		300		22,710
Sunoco, Inc.(b)		400		31,352
Unit Corp.(a)		300		16,509
Valero Energy Corp.		400		20,640
				1,194,425
Financial Services — 2.4%
Ameritrade Holding Corp.(a)		1,300		31,200
Franklin Resources, Inc.		100		9,401
Legg Mason, Inc.		700		83,783
MBNA Corp.		5,400		146,664
The Charles Schwab Corp.		15,600		228,852
The Goldman Sachs Group, Inc.		100		12,771
				512,671
Foods — 0.4%
Panera Bread Co. Cl. A(a) (b)		600		39,408
The Kroger Co.(a)		3,000		56,640
				96,048
Healthcare — 9.1%
Caremark Rx, Inc.(a)		500		25,895
Coventry Health Care, Inc.(a)		450		25,632

(Continued)

The accompanying notes are an integral part of the financial statements.

29

MML Growth Equity Fund – Portfolio of Investments (Continued)

	Number of Shares		Market Value
Express Scripts, Inc.(a)		3,200	$	268,160
HCA, Inc.		3,100		156,550
Health Net, Inc.(a)		900		46,395
Humana, Inc.(a)		500		27,165
Lincare Holdings, Inc.(a)		2,600		108,966
UnitedHealth Group, Inc.		20,088		1,248,268
Universal Health Services, Inc. Cl. B		400		18,696
				1,925,727
Home Construction, Furnishings & Appliances — 1.3%
D.R. Horton, Inc.		2,200		78,606
KB Home(b)		500		36,330
Maytag Corp.		800		15,056
Mohawk Industries, Inc.(a)		900		78,282
The Ryland Group, Inc.		300		21,639
Toll Brothers, Inc.(a)		1,400		48,496
				278,409
Household Products — 0.4%
Black & Decker Corp.(b)		500		43,480
Corning, Inc.(a)		1,800		35,388
				78,868
Industrial - Distribution — 0.0%
Grainger (W.W.), Inc.		100		7,110
Information Retrieval Services — 1.1%
Google, Inc. Cl. A(a) (b)		400		165,944
Yahoo!, Inc.(a)		1,800		70,524
				236,468
Insurance — 3.9%
Aetna, Inc.		2,600		245,206
AFLAC, Inc.		5,000		232,100
Ambac Financial Group, Inc.		1,000		77,060
American International Group, Inc.		2,500		170,575
Marsh & McLennan Companies, Inc.(b)		1,600		50,816
Radian Group, Inc.		300		17,577
WellPoint, Inc.(a)		363		28,993
				822,327
Lodging — 0.8%
Marriott International, Inc. Cl. A		1,400		93,758
MGM Mirage(a) (b)		1,600		58,672
Starwood Hotels & Resorts Worldwide, Inc.		400		25,544
				177,974

	Number of Shares		Market Value
Machinery & Components — 2.1%
Baker Hughes, Inc.		1,300	$	79,014
Caterpillar, Inc.		4,200		242,634
Cooper Cameron Corp.(a)		400		16,560
Grant Prideco, Inc.(a)		900		39,708
Joy Global, Inc.		600		24,000
Smith International, Inc.		600		22,266
Timken Co.		400		12,808
				436,990
Medical Supplies — 1.7%
Agilent Technologies, Inc.(a)		3,000		99,870
Allergan, Inc.(b)		700		75,572
Medtronic, Inc.		500		28,785
St. Jude Medical, Inc.(a)		1,000		50,200
Stryker Corp.(b)		2,200		97,746
				352,173
Metals & Mining — 0.1%
Consol Energy, Inc.		300		19,554
Precision Castparts Corp.		200		10,362
				29,916
Pharmaceuticals — 14.2%
Abbott Laboratories		2,700		106,461
American Pharmacuetical Partners, Inc.(a) (b)		300		11,637
AmerisourceBergen Corp.		800		33,120
Amgen, Inc.(a)		1,600		126,176
Barr Pharmaceuticals(a)		1,200		74,748
Cardinal Health, Inc.		4,800		330,000
Forest Laboratories, Inc.(a)		1,700		69,156
Genentech, Inc.(a)		2,100		194,250
Gilead Sciences, Inc.(a)		900		47,367
Hospira, Inc.(a)		600		25,668
Invitrogen Corp.(a)		300		19,992
Johnson & Johnson		7,200		432,720
McKesson Corp.		4,600		237,314
Medco Health Solutions, Inc.(a)		1,500		83,700
Merck & Co., Inc.		18,700		594,847
Omnicare, Inc.		1,000		57,220
Pfizer, Inc.		19,300		450,076
Wyeth		2,500		115,175
				3,009,627
Prepackaged Software — 0.8%
Adobe Systems, Inc.		2,300		85,008
Cerner Corp.(a) (b)		400		36,364
Microsoft Corp.		600		15,690
Oracle Corp.(a)		3,600		43,956
				181,018

	Number of Shares		Market Value
Real Estate — 0.1%
CB Richard Ellis Group, Inc. Cl. A(a)		300	$	17,655
Restaurants — 1.3%
Brinker International, Inc.(b)		900		34,794
Darden Restaurants, Inc.		2,600		101,088
Outback Steakhouse, Inc.		800		33,288
Sonic Corp.(a)		400		11,800
Wendy's International, Inc.		1,800		99,468
				280,438
Retail — 14.7%
Advance Auto Parts Corp.(a)		2,100		91,266
AutoZone, Inc.(a)		500		45,875
Bed Bath & Beyond, Inc.(a)		4,100		148,215
CVS Corp.		700		18,494
Dollar General Corp.		4,000		76,280
Dollar Tree Stores, Inc.(a) (b)		2,400		57,456
Family Dollar Stores, Inc.		800		19,832
Lowe's Companies, Inc.(b)		8,900		593,274
O'Reilly Automotive, Inc.(a)		400		12,804
Target Corp.		1,300		71,461
The Home Depot, Inc.		25,200		1,020,096
TJX Companies, Inc.		4,100		95,243
Walgreen Co.		3,100		137,206
Wal-Mart Stores, Inc.		15,600		730,080
				3,117,582
Telephone Utilities — 1.0%
ADTRAN, Inc.		600		17,844
Nextel Partners, Inc. Cl. A(a)		4,100		114,554
NII Holdings, Inc. Cl. B(a)		1,800		78,624
				211,022
Tobacco — 5.6%
Altria Group, Inc.		15,900		1,188,048
Transportation — 0.4%
CNF, Inc.		300		16,767
FedEx Corp.		300		31,017
Landstar System, Inc.		400		16,696
Robinson (C.H.) Worldwide, Inc.		400		14,812
				79,292
TOTAL EQUITIES (Cost $19,118,848)				20,618,059

(Continued)

The accompanying notes are an integral part of the financial statements.

30

MML Growth Equity Fund – Portfolio of Investments (Continued)

	Number of Shares		Market Value
RIGHTS — 0.0%
Computers & Information
Seagate Technology(a) (c)		11,100	$	0
TOTAL RIGHTS (Cost $0)				0
WARRANTS — 0.0%
Communications
Lucent Technologies, Inc. Warrants, Expires 12/10/2007(a)		71		40
TOTAL WARRANTS (Cost $0)				40
TOTAL LONG TERM INVESTMENTS (Cost $19,118,848)				20,618,099
	Principal Amount
SHORT-TERM INVESTMENTS — 13.7%
Cash Equivalents — 10.7%(f)
Abbey National PLC Eurodollar Time Deposit 4.290% 01/11/2006	$	47,844		47,844
American Beacon Money Market Fund(e)		20,574		20,574
Bank of America 4.230% 01/20/2006		50,240		50,240
Bank of America 4.270% 01/17/2006		36,816		36,816
Bank of Montreal Eurodollar Time Deposit 4.300% 01/19/2006		95,695		95,695
Bank of Nova Scotia Eurodollar Time Deposit 4.250% 01/27/2006		47,848		47,848
Barclays 4.313% 01/17/2006		49,128		49,128
Barclays Eurodollar Time Deposit 4.300% 01/31/2006		47,848		47,848
Barclays Eurodollar Time Deposit 4.410% 02/27/2006		23,924		23,924
BGI Institutional Money Market Fund(e)		76,556		76,556
Branch Banker & Trust Eurodollar Time Deposit 4.260% 01/11/2006		23,924		23,924

	Principal Amount		Market Value
Calyon Eurodollar Time Deposit 4.335% 02/06/2006	$	47,848	$	47,848
Dexia Group Eurodollar Time Deposit 4.230% 01/20/2006		47,848		47,848
Dexia Group Eurodollar Time Deposit 4.265% 01/27/2006		47,848		47,848
Federal Home Loan Bank Discount Note 4.186% 01/25/2006		28,581		28,581
First Tennessee National Corp. Eurodollar Time Deposit 4.290% 01/13/2006		95,695		95,695
Fortis Bank Eurodollar Time Deposit 4.280% 01/12/2006		47,848		47,848
Fortis Bank Eurodollar Time Deposit 4.300% 01/04/2006		47,848		47,848
Fortis Bank Eurodollar Time Deposit 4.350% 01/03/2006		47,848		47,848
Freddie Mac Discount Note 4.234% 01/30/2006		38,424		38,424
General Electric Capital Corp. 4.274% 01/23/2006		95,153		95,153
Goldman Sachs Financial Square Prime Obligations Money Market Fund(e)		35,107		35,107
Merrimac Cash Fund, Premium Class(e)		7,656		7,656
Morgan Stanley Dean Witter & Co. 4.330% 01/13/2006		95,695		95,695
National Australia Bank Eurodollar Time Deposit 4.156% 01/03/2006		155,964		155,964
Rabobank Nederland Eurodollar Time Deposit 4.150% 01/03/2006		62,202		62,202
Rabobank Nederland Eurodollar Time Deposit 4.210% 01/19/2006		76,556		76,556
Royal Bank of Canada Eurodollar Time Deposit 4.220% 01/20/2006		23,924		23,924
Royal Bank of Canada Eurodollar Time Deposit 4.250% 01/24/2006		47,848		47,848

	Principal Amount		Market Value
Royal Bank of Scotland Eurodollar Time Deposit 4.250% 01/23/2006	$	47,848	$	47,848
Royal Bank of Scotland Eurodollar Time Deposit 4.300% 01/31/2006		71,771		71,771
Skandinaviska Enskilda Banken AB (SEB) Eurodollar Time Deposit 4.230% 01/03/2006		23,924		23,924
Skandinaviska Enskilda Banken AB (SEB) Eurodollar Time Deposit 4.300% 01/17/2006		66,987		66,987
Societe Generale Eurodollar Time Deposit 4.280% 01/30/2006		47,848		47,848
Societe Generale Eurodollar Time Deposit 4.280% 01/31/2006		47,848		47,848
Svenska Handlesbanken Eurodollar Time Deposit 4.100% 01/03/2006		54,605		54,605
The Bank of the West Eurodollar Time Deposit 4.290% 01/25/2006		76,556		76,556
Toronto Dominion Bank Eurodollar Time Deposit 4.300% 01/23/2006		47,848		47,848
UBS AG Eurodollar Time Deposit 4.255% 01/18/2006		23,924		23,924
UBS AG Eurodollar Time Deposit 4.260% 01/10/2006		47,848		47,848
Wells Fargo Eurodollar Time Deposit 4.270% 01/03/2006		40,192		40,192
Wells Fargo Eurodollar Time Deposit 4.300% 01/18/2006		95,695		95,695
				2,263,184
Repurchase Agreement — 2.9%
Investors Bank & Trust Company Repurchase Agreement, dated 12/30/2005, 3.02%, due 01/03/2006(g)		620,336		620,336

(Continued)

The accompanying notes are an integral part of the financial statements.

31

MML Growth Equity Fund – Portfolio of Investments (Continued)

	Principal Amount		Market Value
U.S. Treasury Bills — 0.1%
U.S. Treasury Bill(d) 3.770% 02/23/2006	$	20,000	$	19,887
TOTAL SHORT-TERM INVESTMENTS (At Amortized Cost)				2,903,407
TOTAL INVESTMENTS — 110.7% (Cost $22,022,255)(h)				23,521,506
Other Assets/ (Liabilities) — (10.7%)				(2,279,683	)
NET ASSETS — 100.0%			$	21,241,823

Notes to Portfolio of Investments

(a)  Non-income producing security.

(b)  Denotes all or a portion of security on loan (Note 2).

(c)  This security is valued in good faith under procedures established by the board of trustees.

(d)  This security is held as collateral for open futures contracts (Note 2).

(e)  Amount represents shares owned of the fund.

(f)  Represents investments of security lending collateral. (Note 2).

(g)  Maturity value of $620,544. Collateralized by U.S. Government Agency obligation with a rate of 4.769%, maturity date of 05/15/2032, and an aggregate market value, including accrued interest, of $651,353.

(h)  See Note 6 for aggregate cost for Federal tax purposes.

The remainder of this page is intentionally left blank.

The accompanying notes are an integral part of the financial statements.

32

MML OTC 100 Fund – Portfolio of Investments

December 31, 2005

	Number of Shares		Market Value
EQUITIES — 97.2%
COMMON STOCK
Advertising — 0.6%
Lamar Advertising Co.(a)		570	$	26,300
Monster Worldwide, Inc.(a)		811		33,105
				59,405
Apparel, Textiles & Shoes — 0.6%
Ross Stores, Inc.		939		27,137
Urban Outfitters, Inc.(a)		1,134		28,702
				55,839
Automotive & Parts — 0.9%
Paccar, Inc.		1,250		86,538
Broadcasting, Publishing & Printing — 2.1%
Comcast Corp. Cl. A(a)		6,283		163,107
Liberty Global, Inc. Cl. A(a)		1,635		36,787
				199,894
Commercial Services — 5.8%
Apollo Group, Inc. Cl. A(a)		1,175		71,040
Cintas Corp.		1,327		54,646
eBay, Inc.(a)		6,867		296,998
Fastenal Co.		951		37,270
Paychex, Inc.		2,368		90,268
				550,222
Communications — 9.7%
EchoStar Communications Corp. Cl. A(a)		1,438		39,070
Network Appliance, Inc.(a)		2,562		69,174
NTL, Inc.(a)		612		41,665
Qualcomm, Inc.		13,057		562,496
Research In Motion Limited(a)		1,259		83,107
Sirius Satellite Radio, Inc.(a)		9,493		63,603
Tellabs, Inc.(a)		1,683		18,345
XM Satellite Radio Holdings, Inc. Cl. A(a)		1,509		41,165
				918,625
Communications Equipment — 0.3%
Ericsson (LM) Cl. B Sponsored ADR (Sweden)		846		29,102
Computer Integrated Systems Design — 1.5%
Autodesk, Inc.		1,587		68,162
Cadence Design Systems, Inc.(a)		1,896		32,080
Sun Microsystems, Inc.(a)		9,779		40,974
				141,216

	Number of Shares		Market Value
Computer Programming Services — 1.0%
Cognizant Technology Solutions Corp.(a)		887	$	44,660
Mercury Interactive Corp.(a)		608		16,896
VeriSign, Inc.(a)		1,592		34,897
				96,453
Computer Related Services — 0.9%
Checkfree Corp.(a)		570		26,163
IAC/InterActiveCorp(a)		2,199		62,254
				88,417
Computers & Information — 11.7%
Apple Computer, Inc.(a)		7,740		556,429
CDW Corp.		547		31,491
Cisco Systems, Inc.(a)		14,449		247,367
Comverse Technology, Inc.(a)		1,376		36,588
Dell, Inc.(a)		5,701		170,973
Sandisk Corp.(a)		1,113		69,919
				1,112,767
Data Processing & Preparation — 0.7%
Fiserv, Inc.(a)		1,520		65,770
Electrical Equipment & Electronics — 12.7%
Altera Corp.(a)		3,357		62,205
American Power Conversion Corp.		1,293		28,446
ATI Technologies, Inc.(a)		1,628		27,660
Broadcom Corp. Cl. A(a)		1,751		82,560
Flextronics International Ltd.(a)		4,098		42,783
Garmin Limited		660		43,791
Intel Corp.		13,900		346,944
JDS Uniphase Corp.(a)		12,457		29,399
Kla-Tencor Corp.		1,576		77,744
Linear Technology Corp.		2,682		96,740
Marvell Technology Group Ltd.(a)		1,787		100,233
Maxim Integrated Products, Inc.		3,025		109,626
Microchip Technology, Inc.		1,151		37,005
Nvidia Corp.(a)		1,109		40,545
Xilinx, Inc.		3,045		76,764
				1,202,445
Energy — 0.4%
Patterson-UTI Energy, Inc.		1,165		38,387
Food Retailers — 2.2%
Starbucks Corp.(a)		7,039		211,240

	Number of Shares		Market Value
Healthcare — 1.0%
Express Scripts, Inc.(a)		856	$	71,733
Lincare Holdings, Inc.(a)		619		25,942
				97,675
Information Retrieval Services — 5.9%
Google, Inc. Cl. A(a)		800		331,888
Juniper Networks, Inc.(a)		2,444		54,501
Yahoo!, Inc.(a)		4,491		175,957
				562,346
Internet Content — 0.3%
BEA Systems, Inc.(a)		2,695		25,333
Lodging — 0.4%
Wynn Resorts Limited(a)		715		39,218
Manufacturing — 1.4%
Applied Materials, Inc.		5,525		99,118
Lam Research Corp.(a)		925		33,004
				132,122
Medical Supplies — 1.5%
Biomet, Inc.		2,209		80,783
Dentsply International, Inc.		498		26,738
Patterson Cos, Inc.(a)		872		29,125
				136,646
Pharmaceuticals — 11.9%
Amgen, Inc.(a)		3,788		298,722
Biogen Idec, Inc.(a)		2,430		110,152
Celgene Corp.(a)		1,108		71,798
Chiron Corp.(a)		1,737		77,227
Genzyme Corp.(a)		2,132		150,903
Gilead Sciences, Inc.(a)		2,970		156,311
MedImmune, Inc.(a)		1,734		60,725
Sepracor, Inc.(a)		679		35,036
Sigma-Aldrich Corp.		426		26,962
Teva Pharmaceutical Sponsored ADR (Israel)		3,186		137,030
				1,124,866
Prepackaged Software — 15.2%
Activision, Inc.(a)		1,610		22,121
Adobe Systems, Inc.		3,190		117,902
Check Point Software Technologies Limited(a)		1,588		31,919
Citrix Systems, Inc.(a)		1,380		39,716
Electronic Arts, Inc.(a)		1,996		104,411
Intuit, Inc.(a)		1,468		78,244
Microsoft Corp.		24,121		630,764
Oracle Corp.(a)		14,144		172,698
Pixar, Inc.(a)		788		41,543

(Continued)

The accompanying notes are an integral part of the financial statements.

33

MML OTC 100 Fund – Portfolio of Investments (Continued)

	Number of Shares		Market Value
Red Hat, Inc.(a)		1,146	$	31,217
Siebel Systems, Inc.		4,081		43,177
Symantec Corp.(a)		7,446		130,305
				1,444,017
Retail — 5.1%
Amazon.com, Inc.(a)		1,812		85,436
Bed Bath & Beyond, Inc.(a)		2,629		95,038
Costco Wholesale Corp.		1,638		81,032
Petsmart, Inc.		935		23,992
Sears Holdings Corp.(a)		1,109		128,123
Staples, Inc.		3,235		73,467
				487,088
Retail-Grocery — 0.7%
Whole Foods Market, Inc.		878		67,948
Telephone Utilities — 0.9%
MCI, Inc.		2,353		46,425
NII Holdings, Inc. Cl. B(a)		968		42,282
				88,707
Transportation — 1.2%
Discovery Holding Co. Cl. A(a)		1,568		23,755
Expeditors International of Washington, Inc.		690		46,582
Robinson (C.H.) Worldwide, Inc.		1,113		41,214
				111,551
Travel — 0.6%
Expedia, Inc.(a)		2,257		54,078
TOTAL EQUITIES (Cost $7,791,704)				9,227,915
MUTUAL FUND — 0.7%
Nasdaq-100 Index Tracking Stock		1,646		66,531
TOTAL MUTUAL FUND (Cost $67,741)				66,531
TOTAL LONG TERM INVESTMENTS (Cost $7,859,445)				9,294,446

	Principal Amount		Market Value
SHORT-TERM INVESTMENTS — 3.2%
Repurchase Agreement — 2.7%
Investors Bank & Trust Repurchase Agreement, dated 12/30/05, 3.02%, due 01/03/2006(c)	$	258,943	$	258,943
U.S. Treasury Bills — 0.5%
U.S. Treasury Bill 3.938% 04/06/2006(b)		20,000		19,733
U.S. Treasury Bill 3.993% 04/06/2006(b)		10,000		9,881
U.S. Treasury Bill 4.002% 04/06/2006(b)		20,000		19,763
				49,377
TOTAL SHORT-TERM INVESTMENTS (Cost $308,413)				308,320
TOTAL INVESTMENTS — 101.1% (Cost $8,167,858)(d)				9,602,766
Other Assets/ (Liabilities) — (1.1%)				(106,291	)
NET ASSETS — 100.0%			$	9,496,475

Notes to Portfolio of Investments

ADR - American Depository Receipt

(a)  Non-income producing security.

(b)  This security is held as collateral for open futures contracts. (Note 2).

(c)  Maturity value of $259,030. Collateralized by a U.S. Government Agency obligation with a rate of 7.585%, maturity date of 06/25/2016 and an aggregate market value, including accrued interest, of $271,890.

(d)  See Note 6 for aggregate cost for Federal tax purposes.

The accompanying notes are an integral part of the financial statements.

34

MML Small Cap Growth Equity Fund – Portfolio of Investments

December 31, 2005

	Number of Shares		Market Value
EQUITIES — 87.5%
COMMON STOCK
Advertising — 2.0%
Aquantive, Inc.(a)		10,030	$	253,157
Catalina Marketing Corp.		10,500		266,175
Getty Images, Inc.(a) (b)		17,475		1,559,993
				2,079,325
Aerospace & Defense — 0.2%
Alliant Techsystems, Inc.(a)		2,970		226,225
Air Transportation — 1.7%
Airtran Holdings, Inc.(a) (b)		22,400		359,072
AMR Corp.(a) (b)		12,100		268,983
Forward Air Corp.		3,890		142,568
Gol Linhas Aereas Inteligentes SA ADR (Brazil)		10,320		291,127
JetBlue Airways Corp.(a)		17,895		275,225
US Airways Group, Inc.(a)		12,810		428,187
				1,765,162
Apparel, Textiles & Shoes — 1.2%
DSW, Inc. Cl. A(a)		15,590		408,770
Iconix Brand Group, Inc.(a)		20,920		213,175
Phillips-Van Heusen Corp.		6,520		211,248
Skechers U.S.A., Inc. Cl. A(a)		15,700		240,524
Too, Inc.(a)		7,610		214,678
				1,288,395
Automotive & Parts — 1.3%
LKQ Corp.(a)		27,622		956,274
Tenneco, Inc.(a)		10,200		200,022
United Auto Group, Inc.		5,700		217,740
				1,374,036
Banking, Savings & Loans — 3.0%
Advanta Corp. Cl. B		12,300		399,012
Amcore Financial, Inc.		6,800		206,788
City National Corp.		6,650		481,726
Financial Federal Corp.(b)		29,925		1,330,166
Nelnet, Inc. Cl. A(a)		100		4,068
Signature Bank(a)		5,760		161,683
UMB Financial Corp.		2,600		166,166
Westcorp		5,400		359,694
				3,109,303

	Number of Shares		Market Value
Broadcasting, Publishing & Printing — 0.8%
Central European Media Enterprises Ltd.(a)		2,700	$	156,330
Charter Communications, Inc. Cl. A(a) (b)		109,100		133,102
LodgeNet Entertainment Corp.(a)		11,300		157,522
Playboy Enterprises, Inc. Cl. B(a) (b)		16,700		231,963
TiVo, Inc.(a) (b)		29,600		151,552
				830,469
Building Materials & Construction — 1.0%
Beacon Roofing Supply, Inc.(a)		18,780		539,549
Eagle Materials, Inc.		2,110		258,180
Martin Marietta Materials, Inc.		3,310		253,943
				1,051,672
Chemicals — 0.8%
Cytec Industries, Inc.		7,125		339,364
Hercules, Inc.(a)		25,700		290,410
Minerals Technologies, Inc.		4,000		223,560
				853,334
Commercial Services — 8.9%
The Advisory Board Co.(a)		4,380		208,795
ADVO, Inc.		8,800		247,984
The Corporate Executive Board Co.		23,290		2,089,113
Corrections Corp. of America(a)		9,270		416,872
eResearch Technology, Inc.(a)		21,220		320,422
Exelixis, Inc.(a)		17,600		165,792
First Advantage Corp. Cl. A(a)		4,500		120,195
Grupo Aeroportuario de Sureste SA de CV, ADR (Mexico)(b)		12,310		398,105
Harris Interactive, Inc.(a)		31,000		133,610
Incyte Corp.(a)		24,000		128,160
ITT Educational Services, Inc.(a)		32,550		1,924,030
Ituran Location and Control Ltd.(a)		14,220		226,809
Jacobs Engineering Group, Inc.(a)		3,280		222,614

	Number of Shares		Market Value
LECG Corp.(a)		7,150	$	124,267
Lincoln Educational Services Corp.(a)		31,300		446,338
Opsware, Inc.(a)		75,800		514,682
Pharmaceutical Product Development, Inc.		4,710		291,784
Stericycle, Inc.(a)		4,810		283,213
Valassis Communications, Inc.(a)		7,400		215,118
Vertrue, Inc.(a) (b)		10,850		383,330
VistaPrint Ltd.(a)		8,800		200,235
Washington Group International, Inc.		4,700		248,959
				9,310,427
Communications — 1.3%
Arris Group, Inc.(a)		20,800		196,976
Canadian Satellite Radio Holdings, Inc. Cl. A(a)		1,300		16,471
Crown Castle International Corp.(a)		12,060		324,535
EFJ, Inc.(a)		5,210		52,881
Powerwave Technologies, Inc.(a) (b)		14,400		181,008
SBA Communications Corp.(a)		15,080		269,932
Syniverse Holdings, Inc.(a)		6,100		127,490
Westell Technologies, Inc. Cl. A(a)		46,600		209,700
				1,378,993
Computer & Other Data Processing Service — 0.0%
IHS, Inc. Cl. A(a)		2,100		43,092
Computer Integrated Systems Design — 1.7%
Avid Technology, Inc.(a)		16,450		900,802
F5 Networks, Inc.(a)		5,710		326,555
JDA Software Group, Inc.(a)		3,700		62,937
Sapient Corp.(a) (b)		38,300		217,927
Websense, Inc.(a)		3,810		250,088
				1,758,309
Computer Maintenance & Repair — 0.3%
Electronics for Imaging, Inc.(a)		11,800		313,998
Computer Programming Services — 1.2%
Entrust, Inc.(a)		20,940		101,350
Jamdat Mobile, Inc.(a) (b)		44,500		1,182,810
				1,284,160

(Continued)

The accompanying notes are an integral part of the financial statements.

35

MML Small Cap Growth Equity Fund – Portfolio of Investments (Continued)

	Number of Shares		Market Value
Computer Related Services — 2.9%
Checkfree Corp.(a)		47,542	$	2,182,178
Ingram Micro, Inc. Cl. A(a)		16,800		334,824
NetFlix, Inc.(a) (b)		19,330		523,070
				3,040,072
Computers & Information — 3.1%
Cognos, Inc.(a)		4,650		161,401
Foundry Networks, Inc.(a)		35,190		485,974
Logitech International SA ADR (Switzerland)(a)		9,510		444,783
Redback Networks, Inc.(a)		20,390		286,683
Scientific Games Corp. Cl. A(a)		44,800		1,222,144
SRA International, Inc. Cl. A(a)		2,390		72,991
VeriFone Holdings, Inc.(a)		21,930		554,829
				3,228,805
Cosmetics & Personal Care — 0.2%
Nu Skin Enterprises, Inc. Cl. A		14,600		256,668
Data Processing & Preparation — 2.0%
CSG Systems International, Inc.(a)		9,920		221,414
Factset Research Systems, Inc.(b)		41,012		1,688,054
HomeStore, Inc.(a)		7,500		38,250
The BISYS Group, Inc.(a)		14,800		207,348
				2,155,066
Electric Utilities — 0.4%
El Paso Electric Co.(a)		10,900		229,336
Suntech Power Holdings Co. Ltd. ADR (China)(a)		7,200		196,200
				425,536
Electrical Equipment & Electronics — 3.3%
Cree, Inc.(a) (b)		23,650		596,926
CSR PLC(a)		25,760		416,461
Cypress Semiconductor Corp.(a) (b)		8,200		116,850
Evergreen Solar, Inc.(a)		13,080		139,302
FuelCell Energy, Inc.(a) (b)		16,400		138,908
Gentex Corp.(b)		59,050		1,151,475
Microsemi Corp.(a)		2,820		78,001
Moog, Inc. Cl. A(a)		5,405		153,394
Newport Corp.(a)		14,700		199,038
ON Semiconductor Corp.(a) (b)		53,700		296,961
SiRF Technology Holdings, Inc.(a)		5,880		175,224

	Number of Shares		Market Value
Teledyne Technologies, Inc.(a)		900	$	26,190
				3,488,730
Energy — 4.8%
Alon USA Energy, Inc.(a)		12,620		247,983
Arch Coal, Inc.		3,210		255,195
Bill Barrett Corp.(a)		15,000		579,150
Cabot Oil & Gas Corp. Cl. A		7,060		318,406
Comstock Resources, Inc.(a)		10,200		311,202
Grey Wolf, Inc.(a) (b)		25,000		193,250
Newfield Exploration Co.(a)		29,000		1,452,030
Pride International, Inc.(a)		8,730		268,447
Range Resources Corp.		11,795		310,680
Stolt Offshore SA Sponsored ADR (United Kingdom)(a)		18,300		213,378
TETRA Technologies, Inc.(a)		10,000		305,200
UGI Corp.		11,500		236,900
Vintage Petroleum, Inc.		4,300		229,319
Whiting Petroleum Corp.(a)		3,900		156,000
				5,077,140
Entertainment & Leisure — 1.0%
Churchill Downs, Inc.		4,700		172,631
Gaylord Entertainment(a)		19,200		836,928
				1,009,559
Financial Services — 3.8%
Affiliated Managers Group, Inc.(a) (b)		5,420		434,955
Federated Investors, Inc. Cl. B		4,790		177,422
Hong Kong Exchanges and Clearing Ltd.		24,000		99,699
IndyMac Bancorp, Inc.		3,000		117,060
IntercontinentalExchange, Inc.(a)		24,110		876,399
Investment Technology Group, Inc.(a)		9,950		352,628
Melco International Development Ltd.		159,860		190,321
The Nasdaq Stock Market, Inc.(a)		24,750		870,705
Nuveen Investments, Inc. Cl. A		10,770		459,017
Redwood Trust, Inc.		4,300		177,418
Ventas, Inc.		7,300		233,746
				3,989,370
Foods — 1.9%
Diamond Foods, Inc.		10,240		202,445
Panera Bread Co. Cl. A(a)		2,870		188,502

	Number of Shares		Market Value
Provide Commerce, Inc.(a)		24,000	$	794,640
The J.M. Smucker Co.		18,750		825,000
				2,010,587
Healthcare — 5.9%
Allscripts Healthcare Solutions, Inc.(a) (b)		58,300		781,220
American Healthways, Inc.(a) (b)		32,100		1,452,525
AmSurg Corp.(a)		37,650		860,679
Covance, Inc.(a)		6,550		318,003
Genesis HealthCare Corp.(a)		9,200		335,984
Human Genome Sciences, Inc.(a) (b)		26,700		228,552
Manor Care, Inc.		9,100		361,907
Matria Healthcare, Inc.(a)		9,800		379,848
Symbion, Inc.(a)		9,900		227,700
Triad Hospitals, Inc.(a)		5,200		203,996
VCA Antech, Inc.(a)		35,900		1,012,380
				6,162,794
Heavy Machinery — 0.8%
Aviall, Inc.(a)		7,700		221,760
Bucyrus International, Inc. Cl. A(b)		11,000		579,700
				801,460
Home Construction, Furnishings & Appliances — 0.9%
Ethan Allen Interiors, Inc.(b)		5,700		208,221
Fossil, Inc.(a) (b)		35,050		753,926
				962,147
Household Products — 0.6%
Ferro Corp.		12,200		228,872
Jarden Corp.(a)		12,765		384,865
				613,737
Information Retrieval Services — 0.8%
Bankrate, Inc.(a)		2,020		59,630
CoStar Group, Inc.(a) (b)		18,800		811,596
				871,226
Insurance — 2.5%
Arch Capital Group Ltd.(a)		17,060		934,035
Aspen Insurance Holdings Ltd.		18,390		435,291
HealthExtras, Inc.(a)		8,840		221,884
Platinum Underwriters Holdings Ltd.		7,100		220,597
ProAssurance Corp.(a)		11,150		542,336

(Continued)

The accompanying notes are an integral part of the financial statements.

36

MML Small Cap Growth Equity Fund – Portfolio of Investments (Continued)

	Number of Shares		Market Value
Reinsurance Group of America, Inc.(b)		4,900	$	234,024
				2,588,167
Lodging — 1.9%
La Quinta Corp.(a)		49,560		552,098
LaSalle Hotel Properties		7,360		270,259
Vail Resorts, Inc.(a)		34,450		1,137,884
				1,960,241
Machinery & Components — 1.3%
Chicago Bridge & Iron Co. NV		37,650		949,157
Global Power Equipment Group, Inc.(a)		23,900		108,028
Tennant Co.		1,500		78,000
Woodward Governor Co.		2,500		215,025
				1,350,210
Manufacturing — 0.2%
Stewart & Stevenson Services Corp.		9,400		198,622
Medical Supplies — 2.7%
Arrow International, Inc.		6,800		197,132
HealthTronics, Inc.(a)		14,110		107,942
Hologic, Inc.(a)		7,470		283,262
Intermagnetics General Corp.(a)		7,030		224,257
Kensey Nash Corp.(a) (b)		10,200		224,706
Kyphon, Inc.(a) (b)		18,360		749,639
PSS World Medical, Inc.(a)		68,100		1,010,604
				2,797,542
Metals & Mining — 0.7%
Carpenter Technology		4,000		281,880
Century Aluminum Co.(a)		11,900		311,899
CommScope, Inc.(a)		5,600		112,728
				706,507
Pharmaceuticals — 3.9%
Abgenix, Inc.(a) (b)		28,220		607,012
Alkermes, Inc.(a) (b)		17,600		336,512
Amylin Pharmaceuticals, Inc.(a) (b)		16,870		673,450
Atherogenics, Inc.(a)		5,980		119,660
Digene Corp.(a)		13,060		380,960
Encysive Pharmaceuticals, Inc.(a)		13,130		103,596
Endo Pharmaceuticals Holdings, Inc.(a)		7,170		216,964
ICOS Corp.(a)		3,970		109,691
Martek Biosciences Corp.(a) (b)		14,100		347,001

	Number of Shares		Market Value
The Medicines Co.(a) (b)		12,950	$	225,978
Salix Pharmaceuticals Ltd.(a)		7,470		131,323
Vertex Pharmaceuticals, Inc.(a)		4,820		133,369
ViroPharma, Inc.(a)		32,100		595,455
Zymogenetics, Inc.(a)		6,400		108,864
				4,089,835
Prepackaged Software — 8.7%
Activision, Inc.(a)		6,600		90,684
Blackbaud, Inc.		45,800		782,264
Blackboard, Inc.(a)		47,500		1,376,550
Cerner Corp.(a) (b)		15,225		1,384,105
Dendrite International, Inc.(a)		58,000		835,780
EPIQ Systems, Inc.(a) (b)		23,190		429,943
MicroStrategy, Inc. Cl. A(a) (b)		16,800		1,390,032
Red Hat, Inc.(a) (b)		38,920		1,060,181
Salesforce.com, Inc.(a)		5,740		183,967
Serena Software, Inc.(a)		11,200		262,528
Take-Two Interactive Software, Inc.(a) (b)		50,600		895,620
THQ, Inc.(a)		12,275		292,759
Verint Systems, Inc.(a)		5,890		203,028
				9,187,441
Real Estate — 0.4%
CB Richard Ellis Group, Inc. Cl. A(a)		5,270		310,140
The Link REIT(a)		71,900		136,295
				446,435
Restaurants — 0.8%
California Pizza Kitchen, Inc.(a)		10,750		343,678
RARE Hospitality International, Inc.(a)		7,900		240,081
Red Robin Gourmet Burgers, Inc.(a)		3,750		191,100
Texas Roadhouse, Inc. Cl. A(a)		2,200		34,210
				809,069
Retail — 2.3%
Borders Group, Inc.		9,900		214,533
GameStop Corp. Cl. B(a)		6,430		185,827
Insight Enterprises, Inc.(a)		4,640		90,990
O'Reilly Automotive, Inc.(a)		39,490		1,264,075
Stamps.com, Inc.(a)		14,350		329,476
Zumiez, Inc.(a) (b)		8,700		376,014
				2,460,915

	Number of Shares		Market Value
Telephone Utilities — 1.1%
Alamosa Holdings, Inc.(a)		14,290	$	265,937
Equinix, Inc.(a)		7,910		322,412
General Communication, Inc. Cl. A(a)		28,500		294,405
Ubiquitel, Inc.(a)		31,300		309,557
				1,192,311
Transportation — 3.2%
CNF, Inc.		4,000		223,560
J.B. Hunt Transport Services, Inc.		60,800		1,376,512
Kansas City Southern(a) (b)		49,475		1,208,674
Knight Transportation, Inc.		14,565		301,932
Werner Enterprises, Inc.		12,420		244,674
				3,355,352
TOTAL EQUITIES (Cost $72,412,752)				91,902,444
MUTUAL FUND — 2.5%
iShares Russell 2000 Growth Index Fund		37,030		2,578,029
TOTAL MUTUAL FUND (Cost $2,585,809)				2,578,029
TOTAL LONG TERM INVESTMENTS (Cost $74,998,561)				94,480,473
	Principal Amount
SHORT-TERM INVESTMENTS — 28.5%
Cash Equivalents — 18.8%(d)
Abbey National PLC Eurodollar Time Deposit 4.290% 01/11/2006	$	417,971		417,971
American Beacon Money Market Fund(c)		179,725		179,725
Bank of America 4.230% 01/20/2006		438,864		438,864
Bank of America 4.270% 01/17/2006		321,605		321,605
Bank of Montreal Eurodollar Time Deposit 4.300% 01/19/2006		835,931		835,931
Bank of Nova Scotia Eurodollar Time Deposit 4.250% 01/27/2006		417,965		417,965
Barclays 4.313% 01/17/2006		429,151		429,151

(Continued)

The accompanying notes are an integral part of the financial statements.

37

MML Small Cap Growth Equity Fund – Portfolio of Investments (Continued)

	Principal Amount		Market Value
Barclays Eurodollar Time Deposit 4.300% 01/31/2006	$	417,965	$	417,965
Barclays Eurodollar Time Deposit 4.410% 02/27/2006		208,983		208,983
BGI Institutional Money Market Fund(c)		668,744		668,744
Branch Banker & Trust Eurodollar Time Deposit 4.260% 01/11/2006		208,983		208,983
Calyon Eurodollar Time Deposit 4.335% 02/06/2006		417,965		417,965
Dexia Group Eurodollar Time Deposit 4.230% 01/20/2006		417,965		417,965
Dexia Group Eurodollar Time Deposit 4.265% 01/27/2006		417,965		417,965
Federal Home Loan Bank Discount Note 4.186% 01/25/2006		249,665		249,665
First Tennessee National Corp. Eurodollar Time Deposit 4.290% 01/13/2006		835,931		835,931
Fortis Bank Eurodollar Time Deposit 4.280% 01/12/2006		417,965		417,965
Fortis Bank Eurodollar Time Deposit 4.300% 01/04/2006		417,965		417,965
Fortis Bank Eurodollar Time Deposit 4.350% 01/03/2006		417,965		417,965
Freddie Mac Discount Note 4.234% 01/30/2006		335,645		335,645
General Electric Capital Corp. 4.274% 01/23/2006		831,194		831,194
Goldman Sachs Financial Square Prime Obligations Money Market Fund(c)		306,673		306,673
Merrimac Cash Fund, Premium Class(c)		66,875		66,875
Morgan Stanley Dean Witter & Co. 4.330% 01/13/2006		835,931		835,931
National Australia Bank Eurodollar Time Deposit 4.156% 01/03/2006		1,362,401		1,362,401

	Principal Amount		Market Value
Rabobank Nederland Eurodollar Time Deposit 4.150% 01/03/2006	$	543,355	$	543,355
Rabobank Nederland Eurodollar Time Deposit 4.210% 01/19/2006		668,744		668,744
Royal Bank of Canada Eurodollar Time Deposit 4.220% 01/20/2006		208,983		208,983
Royal Bank of Canada Eurodollar Time Deposit 4.250% 01/24/2006		417,965		417,965
Royal Bank of Scotland Eurodollar Time Deposit 4.250% 01/23/2006		417,965		417,965
Royal Bank of Scotland Eurodollar Time Deposit 4.300% 01/31/2006		626,948		626,948
Skandinaviska Enskilda Banken AB Eurodollar Time Deposit (SEB) 4.230% 01/03/2006		208,983		208,983
Skandinaviska Enskilda Banken AB Eurodollar Time Deposit (SEB) 4.300% 01/17/2006		585,152		585,152
Societe Generale Eurodollar Time Deposit 4.280% 01/30/2006		417,965		417,965
Societe Generale Eurodollar Time Deposit 4.280% 01/31/2006		417,965		417,965
Svenska Handlesbanken Eurodollar Time Deposit 4.100% 01/03/2006		476,991		476,991
The Bank of the West Eurodollar Time Deposit 4.290% 01/25/2006		668,744		668,744
Toronto Dominion Bank Eurodollar Time Deposit 4.300% 01/23/2006		417,965		417,965
UBS AG Eurodollar Time Deposit 4.255% 01/18/2006		208,983		208,983
UBS AG Eurodollar Time Deposit 4.260% 01/10/2006		417,965		417,965
Wells Fargo Eurodollar Time Deposit 4.270% 01/03/2006		351,090		351,090

	Principal Amount		Market Value
Wells Fargo Eurodollar Time Deposit 4.300% 01/18/2006	$	835,931	$	835,931
				19,769,686
Repurchase Agreement — 9.7%
Investors Bank & Trust Company Repurchase Agreement, dated 12/30/2005, 3.02%, due 01/03/2006(e)		10,161,499		10,161,499
TOTAL SHORT-TERM INVESTMENTS (At Amortized Cost)				29,931,185
TOTAL INVESTMENTS — 118.5% (Cost $104,929,746)(f)				124,411,658
Other Assets/ (Liabilities) — (18.5%)				(19,403,620	)
NET ASSETS — 100.0%			$	105,008,038

Notes to Portfolio of Investments

ADR - American Depository Receipt

REIT - Real Estate Investment Trust

(a)  Non-income producing security.

(b)  Denotes all or a portion of security on loan (Note 2).

(c)  Amount represents shares owned of the fund.

(d)  Represents investments of security lending collateral. (Note 2).

(e)  Maturity value of $10,164,909. Collateralized by U.S. Government Agency obligations with a rate of 4.88%, maturity date of 03/25/2033, and aggregate market value, including accrued interest, of $10,669,574.

(f)  See Note 6 for aggregate cost for Federal tax purposes.

The accompanying notes are an integral part of the financial statements.

38

MML Emerging Growth Fund – Portfolio of Investments

December 31, 2005

	Number of Shares		Market Value
EQUITIES — 97.0%
COMMON STOCK
Advertising — 2.5%
Aquantive, Inc.(a)		5,800	$	146,392
Marchex, Inc. Cl. B(a)		3,400		76,466
Valueclick, Inc.(a)		6,825		123,601
				346,459
Air Transportation — 0.6%
Copa Holdings SA Cl. A(a)		20		546
JetBlue Airways Corp.(a)		5,565		85,590
				86,136
Apparel, Textiles & Shoes — 1.6%
bebe stores, Inc.		3,325		46,650
Steven Madden Ltd.(a)		1,800		52,614
Volcom, Inc.(a)		3,590		122,096
				221,360
Banking, Savings & Loans — 2.9%
Euronet Worldwide, Inc.(a)		5,490		152,622
PrivateBancorp, Inc.		3,856		137,158
SVB Financial Group(a)		2,450		114,758
				404,538
Beverages — 0.6%
Peet's Coffee & Tea, Inc.(a)		2,640		80,124
Building Materials & Construction — 1.2%
Chemed Corp.		1,304		64,783
Merge Technologies, Inc.(a)		3,770		94,401
				159,184
Commercial Services — 12.8%
AMN Healthcare Services, Inc.(a)		8,380		165,756
Bright Horizons Family Solutions, Inc.(a)		4,880		180,804
Ctrip.com International Ltd. ADR (China)(a)		2,000		115,500
eResearch Technology, Inc.(a)		8,890		134,239
FTI Consulting, Inc.(a)		2,990		82,046
Global Payments, Inc.		2,120		98,813
Huron Consulting Group, Inc.(a)		2,500		59,975
Keryx Biopharmaceuticals(a)		4,740		69,394
Lifecell Corp.(a)		6,370		121,476
MPS Group, Inc.(a)		2,730		37,319
Navigant Consulting, Inc.(a)		6,350		139,573

	Number of Shares		Market Value
Portfolio Recovery Associates, Inc.(a)		3,170	$	147,215
Resources Connection, Inc.(a)		3,660		95,380
Universal Technical Institute, Inc.(a)		4,720		146,037
WebSideStory, Inc.(a)		5,260		95,364
Wind River Systems, Inc.(a)		5,710		84,337
				1,773,228
Communications — 3.0%
AudioCodes Ltd.(a)		9,740		108,114
Lifeline Systems, Inc.(a)		3,190		116,626
Nice Systems Ltd. ADR (Israel)(a)		1,497		72,096
Openwave Systems, Inc.(a)		6,570		114,778
				411,614
Computer & Other Data Processing Service — 0.2%
Health Grades, Inc.(a)		4,630		29,030
Patni Computer Systems Ltd. ADR (India)(a)		20		464
				29,494
Computer Integrated Systems Design — 1.5%
Blue Coat Systems, Inc.(a)		400		18,288
Cogent, Inc.(a)		3,010		68,267
Optimal Robotics Corp. Cl. A(a)		2,420		49,029
TALX Corp.		1,220		55,766
Vasco Data Security International, Inc.(a)		1,730		17,058
				208,408
Computer Programming Services — 0.4%
WiderThan Co. Ltd. ADR (South Korea)(a)		3,240		49,086
Computer Related Services — 1.2%
CNET Networks, Inc.(a)		4,710		69,190
eCollege.com, Inc.(a)		2,700		48,681
LivePerson, Inc.(a)		1,000		5,610
NetFlix, Inc.(a)		1,740		47,084
				170,565
Computers & Information — 4.5%
Micros Systems, Inc.(a)		1,907		92,146
M-Systems Flash Disk Pioneers Ltd.(a)		9,530		315,634
Redback Networks, Inc.(a)		9,140		128,508
Scientific Games Corp. Cl. A(a)		3,210		87,569
				623,857

	Number of Shares		Market Value
Data Processing & Preparation — 1.1%
Linktone Limited ADR (China)(a)		8,300	$	86,320
Tom Online, Inc. ADR (China)(a)		3,200		63,424
				149,744
Electric Utilities — 0.0%
Suntech Power Holdings Co. Ltd. ADR (China)(a)		50		1,362
Electrical Equipment & Electronics — 8.5%
Advanced Analogic Technologies, Inc.(a)		3,160		43,766
Ceradyne, Inc.(a)		870		38,106
DRS Technologies, Inc.		2,540		130,607
Energy Conversion Devices, Inc.(a)		1,240		50,530
Genesis Microchip, Inc.(a)		2,750		49,747
Ixia(a)		8,387		123,960
Netlogic Microsystems, Inc.(a)		5,130		139,741
O2Micro International Ltd. ADR (Cayman Islands)(a)		12,450		126,741
Photon Dynamics, Inc.(a)		6,040		110,411
Portalplayer, Inc.(a)		2,980		84,394
Silicon Motion Technology Corp. ADR (Taiwan)(a)		1,200		14,400
SiRF Technology Holdings, Inc.(a)		990		29,502
SunPower Corp. Cl. A(a)		150		5,098
Trident Microsystems, Inc.(a)		5,130		92,340
Virage Logic Corp.(a)		7,640		75,483
Volterra Semiconductor Corp.(a)		3,400		51,000
				1,165,826
Energy — 1.9%
Cal Dive International, Inc.(a)		3,140		112,695
Unit Corp.(a)		2,670		146,930
				259,625
Financial Services — 5.2%
Affiliated Managers Group, Inc.(a)		2,000		160,500
Boston Private Financial Holdings, Inc.		4,030		122,593
East West Bancorp, Inc.		2,059		75,133

(Continued)

The accompanying notes are an integral part of the financial statements.

39

MML Emerging Growth Fund – Portfolio of Investments (Continued)

	Number of Shares		Market Value
GFI Group, Inc.(a)		2,030	$	96,283
Greenhill & Co., Inc.		500		28,080
IntercontinentalExchange, Inc.(a)		460		16,721
Investment Technology Group, Inc.(a)		2,450		86,828
Lazard Ltd. Cl. A		2,730		87,087
optionsXpress Holdings, Inc.		2,020		49,591
				722,816
Foods — 0.6%
United Natural Foods, Inc.(a)		3,260		86,064
Healthcare — 5.9%
Allscripts Healthcare Solutions, Inc.(a)		2,200		29,480
American Healthways, Inc.(a)		2,060		93,215
Hythiam, Inc.(a)		4,800		29,520
LCA-Vision, Inc.		2,890		137,304
Matria Healthcare, Inc.(a)		3,940		152,714
Option Care, Inc.		5,685		75,952
Radiation Therapy Services, Inc.(a)		3,410		120,407
Sunrise Senior Living, Inc.(a)		1,550		52,250
United Surgical Partners International, Inc.(a)		3,935		126,510
				817,352
Heavy Machinery — 1.8%
Dril-Quip, Inc.(a)		2,700		127,440
Hydril(a)		2,030		127,078
				254,518
Home Construction, Furnishings & Appliances — 0.5%
Select Comfort Corp.(a)		2,570		70,289
Information Retrieval Services — 1.6%
Bankrate, Inc.(a)		1,370		40,442
Digital River, Inc.(a)		4,690		139,481
Infospace, Inc.(a)		1,721		44,436
				224,359
Insurance — 1.8%
Centene Corp.(a)		5,390		141,703
Tower Group, Inc.		4,991		109,702
				251,405

	Number of Shares		Market Value
Internet Software — 0.9%
Opsware, Inc.(a)		1,940	$	13,173
WebEx Communications, Inc.(a)		5,370		116,153
				129,326
Lodging — 0.5%
Four Seasons Hotels, Inc.		1,260		62,685
Machinery & Components — 1.9%
Grant Prideco, Inc.(a)		3,630		160,156
Ultratech, Inc.(a)		6,310		103,610
				263,766
Medical Supplies — 8.8%
AngioDynamics, Inc.(a)		300		7,659
Armor Holdings, Inc.(a)		2,730		116,434
Hologic, Inc.(a)		2,120		80,390
I-Flow Corp.(a)		8,620		126,024
Illumina, Inc.(a)		7,900		111,390
Immucor, Inc.(a)		4,270		99,747
Intermagnetics General Corp.(a)		500		15,950
Intralase Corp.(a)		5,360		95,569
Kyphon, Inc.(a)		3,090		126,165
NuVasive, Inc.(a)		6,930		125,433
SonoSite, Inc.(a)		930		32,559
Syneron Medical Ltd.(a)		3,000		95,250
Ventana Medical Systems, Inc.(a)		1,280		54,208
Viasys Healthcare, Inc.(a)		400		10,280
Vital Images, Inc.(a)		4,390		114,798
				1,211,856
Pharmaceuticals — 3.9%
Adeza Biomedical Corp.(a)		1,900		39,995
Angiotech Pharmaceuticals, Inc.(a)		3,870		50,890
Atherogenics, Inc.(a)		4,830		96,648
First Horizon Pharmaceutical Corp.(a)		3,488		60,168
NitroMed, Inc.(a)		4,280		59,706
Salix Pharmaceuticals Ltd.(a)		6,755		118,753
ViroPharma, Inc.(a)		5,660		104,993
				531,153
Prepackaged Software — 6.8%
Epicor Software Corp.(a)		2,750		38,857
Informatica Corp.(a)		9,160		109,920
Kenexa Corp.(a)		400		8,440

	Number of Shares		Market Value
MicroStrategy, Inc. Cl. A(a)		2,090	$	172,927
Quest Software, Inc.(a)		7,230		105,486
Red Hat, Inc.(a)		1,000		27,240
Retalix Ltd.(a)		1,990		48,675
RightNow Technologies, Inc.(a)		4,750		87,685
Taleo Corp., Cl. A(a)		4,090		54,315
THQ, Inc.(a)		4,750		113,287
Ultimate Software Group, Inc.(a)		3,620		69,033
Witness Systems, Inc.(a)		5,060		99,530
				935,395
Restaurants — 2.7%
California Pizza Kitchen, Inc.(a)		6,572		210,107
P.F. Chang's China Bistro, Inc.(a)		871		43,228
Texas Roadhouse, Inc. Cl. A(a)		8,020		124,711
				378,046
Retail — 4.2%
Build-A-Bear Workshop, Inc.(a)		2,190		64,912
Coldwater Creek, Inc.(a)		3,040		92,811
GSI Commerce, Inc.(a)		7,424		112,028
Hibbett Sporting Goods, Inc.(a)		3,641		103,696
Zumiez, Inc.(a)		4,700		203,134
				576,581
Telephone Utilities — 3.3%
ADTRAN, Inc.		1,800		53,532
Equinix, Inc.(a)		3,380		137,769
j2 Global Communications, Inc.(a)		4,121		176,132
NeuStar, Inc. Cl. A(a)		2,740		83,543
				450,976
Transportation — 2.1%
American Commercial Lines, Inc.(a)		450		13,631
Hornbeck Offshore Services, Inc.(a)		4,470		146,169
UTI Worldwide, Inc.		1,320		122,549
				282,349
TOTAL EQUITIES (Cost $12,055,325)				13,389,546

(Continued)

The accompanying notes are an integral part of the financial statements.

40

MML Emerging Growth Fund – Portfolio of Investments (Continued)

	Principal Amount		Market Value
SHORT-TERM INVESTMENTS — 3.4%
Repurchase Agreement
Investors Bank & Trust Company Repurchase Agreement, dated 12/30/2005, 3.02%, due 01/03/2006(b)	$	477,164	$	477,164
TOTAL SHORT-TERM INVESTMENTS (At Amortized Cost)				477,164
TOTAL INVESTMENTS — 100.4% (Cost $12,532,489)(c)				13,866,710
Other Assets/ (Liabilities) — (0.4%)				(59,763	)
NET ASSETS — 100.0%			$	13,806,947

Notes to Portfolio of Investments

ADR - American Depository Receipt

(a)  Non-income producing security.

(b)  Maturity value of $477,324. Collateralized by U.S. Government Agency obligation with a rate of 4.044%, maturity date of 04/01/2033, and an aggregate market value, including accrued interest, of $501,022.

(c)  See Note 6 for aggregate cost for Federal tax purposes.

The remainder of this page is intentionally left blank.

The accompanying notes are an integral part of the financial statements.

41

MML Series Investment Fund – Financial Statements

Statements of Assets and Liabilities

December 31, 2005

	MML Large Cap Value Fund			MML Equity Index Fund			MML Growth Equity Fund			MML OTC 100 Fund			MML Small Cap Growth Equity Fund			MML Emerging Growth Fund
Assets:
Investments, at value (Note 2)(a)	$	125,032,686		$	393,460,367		$	20,618,099		$	9,294,446		$	94,480,473		$	13,389,546
Short-term investments, at value (Note 2)(b)		26,678,594			32,910,407			2,903,407			308,320			29,931,185			477,164
Total Investments(c)		151,711,280			426,370,774			23,521,506			9,602,766			124,411,658			13,866,710
Cash		-			2,487			-			-			264,032			-
Receivables from:
Investments sold		-			459,488			-			-			338,119			55,317
Affiliated investment adviser (Note 3)		-			4,389			3,783			4,581			2,533			3,674
Fund shares sold		132,143			256,828			346			406			108,974			8,008
Interest and dividends		201,437			659,368			30,818			4,385			34,019			563
Foreign taxes withheld		207			-			15			-			113			-
Total assets		152,045,067			427,753,334			23,556,468			9,612,138			125,159,448			13,934,272
Liabilities:
Payables for:
Investments purchased		-			499,467			-			47,213			224,311			46,706
Fund shares repurchased		11,316			214,016			2,940			34,206			17,789			38,315
Variation margin on open futures contracts (Note 2)		-			11,287			1,325			1,440			-			-
Securities on loan (Note 2)		18,141,882			31,128,588			2,263,184			-			19,769,686			-
Affiliated trustees' fees and expenses (Note 3)		20,922			91,565			8,076			4,099			17,045			4,611
Affiliates (Note 3):		-			-			-			-			-			-
Investment management fees		87,855			33,982			14,680			3,771			93,978			12,537
Administration fees		-			41,636			-			-			-			-
Accrued expenses and other liabilities		26,627			35,743			24,440			24,934			28,601			25,156
Total liabilities		18,288,602			32,056,284			2,314,645			115,663			20,151,410			127,325
Net assets	$	133,756,465		$	395,697,050		$	21,241,823		$	9,496,475		$	105,008,038		$	13,806,947
Net assets consist of:
Paid-in capital	$	115,211,706		$	369,697,848		$	43,935,645		$	17,381,090		$	97,242,103		$	20,014,164
Undistributed net investment income (distributions in excess of net investment income)		(2,618	)		(57,938	)		(7,532	)		(1,561	)		(17,038	)		(4,337	)
Accumulated net realized loss on investments, futures contracts and foreign currency translations		(6,035,147	)		(18,947,169	)		(24,181,741	)		(9,313,271	)		(11,698,939	)		(7,537,101	)
Net unrealized appreciation on investments, futures contracts, foreign currency and other assets and liabilities		24,582,524			45,004,309			1,495,451			1,430,217			19,481,912			1,334,221
Net assets	$	133,756,465		$	395,697,050		$	21,241,823		$	9,496,475		$	105,008,038		$	13,806,947
Shares outstanding:		11,863,109			-			2,920,276			2,270,886			7,127,477			2,312,380
Net asset value, offering price and redemption price per share:	$	11.27		$	-		$	7.27		$	4.18		$	14.73		$	5.97

(a) Cost of investments:	$	100,450,161	$	348,427,246	$	19,118,848	$	7,859,445	$	74,998,561	$	12,055,325
(b) Cost of short-term investments:	$	26,678,594	$	32,910,929	$	2,903,407	$	308,413	$	29,931,185	$	477,164
(c) Securities on loan with market value of:	$	17,655,219	$	29,856,824	$	2,188,716	$	-	$	18,934,409	$	-

The accompanying notes are an integral part of the financial statements.

42

43

MML Series Investment Fund – Financial Statements (Continued)

Statements of Assets and Liabilities

December 31, 2005

	MML Large Cap Value Fund		MML Equity Index Fund		MML Growth Equity Fund		MML OTC 100 Fund		MML Small Cap Growth Equity Fund		MML Emerging Growth Fund
Class I shares:
Net assets	$	-	$	76,012,310	$	-	$	-	$	-	$	-
Shares outstanding		-		4,949,687		-		-		-		-
Net asset value, offering price and redemption price per share	$	-	$	15.36	$	-	$	-	$	-	$	-
Class II shares:
Net assets	$	-	$	182,390,108	$	-	$	-	$	-	$	-
Shares outstanding		-		11,887,978		-		-		-		-
Net asset value, offering price and redemption price per share	$	-	$	15.34	$	-	$	-	$	-	$	-
Class III shares:
Net assets	$	-	$	137,294,632	$	-	$	-	$	-	$	-
Shares outstanding		-		8,966,163		-		-		-		-
Net asset value, offering price and redemption price per share	$	-	$	15.31	$	-	$	-	$	-	$	-

The accompanying notes are an integral part of the financial statements.

44

45

MML Series Investment Fund – Financial Statements (Continued)

Statements of Operations

For the Year Ended December 31, 2005

	MML Large Cap Value Fund			MML Equity Index Fund			MML Growth Equity Fund			MML OTC 100 Fund			MML Small Cap Growth Equity Fund			MML Emerging Growth Fund
Investment income (Note 2):
Dividends(a)	$	1,601,586		$	7,222,635		$	276,987		$	56,057		$	247,513		$	10,909
Interest		123,825			67,134			11,567			5,307			222,360			22,634
Securities lending income		11,123			30,133			1,941			-			66,999			-
Total investment income		1,736,534			7,319,902			290,495			61,364			536,872			33,543
Expenses (Note 3):
Investment management fees (Note 3)		811,453			390,399			176,885			47,022			819,246			140,164
Custody fees		20,849			45,973			17,490			11,984			45,911			28,973
Trustee reporting		443			443			443			443			443			444
Audit and legal fees		29,510			48,708			24,093			24,125			28,142			23,600
Proxy fees		1,255			930			995			929			1,255			1,255
Shareholder reporting fees		9,427			41,640			2,366			1,138			6,875			1,372
Trustees' fees (Note 3)		38,404			163,847			9,798			4,698			28,294			5,817
		911,341			691,940			232,070			90,339			930,166			201,625
Administration fees (Note 3):
Class I		-			237,395			-			-			-			-
Class II		-			335,339			-			-			-			-
Class III		-			67,386			-			-			-			-
Total expenses		911,341			1,332,060			232,070			90,339			930,166			201,625
Expenses waived (Note 3)		-			(106,332	)		(30,863	)		(31,822	)		(27,092	)		(46,776	)
Class II Administration fees waived (Note 3)		-			(88,247	)		-			-			-			-
Class III Administration fees waived (Note 3)		-			(67,386	)		-			-			-			-
Net expenses		911,341			1,070,095			201,207			58,517			903,074			154,849
Net investment income (loss)		825,193			6,249,807			89,288			2,847			(366,202	)		(121,306	)
Realized and unrealized gain (loss):
Net realized gain (loss) on:
Investment transactions		(255,216	)		(3,949,975	)		868,317			931,202			4,654,684			898,014
Closed futures contracts		-			185,072			11,431			(7,619	)		-			-
Foreign currency transactions		(8,543	)		-			-			-			(174	)		-
Net realized gain (loss)		(263,759	)		(3,764,903	)		879,748			923,583			4,654,510			898,014
Net change in unrealized appreciation (depreciation) on:
Investments		9,376,725			15,041,411			(121,554	)		(872,716	)		5,548,935			(656,201	)
Open futures contracts		-			(106,836	)		(3,800	)		(5,959	)		-			-
Translation of assets and liabilities in foreign currencies		11			-			(2	)		-			-			-
Net unrealized gain (loss)		9,376,736			14,934,575			(125,356	)		(878,675	)		5,548,935			(656,201	)
Net realized and unrealized gain (loss)		9,112,977			11,169,672			754,392			44,908			10,203,445			241,813
Net increase in net assets resulting from operations	$	9,938,170		$	17,419,479		$	843,680		$	47,755		$	9,837,243		$	120,507

(a) Net of foreign withholding tax of: $ 17,012 $ - $ - $ 271 $ 694 $ 26

The accompanying notes are an integral part of the financial statements.

46

47

MML Series Investment Fund – Financial Statements (Continued)

Statements of Changes in Net Assets

	MML Large Cap Value Fund						MML Equity Index Fund						MML Growth Equity Fund
	Year Ended December 31, 2005			Year Ended December 31, 2004			Year Ended December 31, 2005			Year Ended December 31, 2004			Year Ended December 31, 2005			Year Ended December 31, 2004
Increase (Decrease) in Net Assets:
Operations:
Net investment income	$	825,193		$	523,341		$	6,249,807		$	7,085,355		$	89,288		$	103,479
Net realized gain (loss) on investment transactions, futures contracts and foreign currency transactions		(263,759	)		(394,358	)		(3,764,903	)		(5,329,330	)		879,748			461,152
Net change in unrealized appreciation (depreciation) on investments, futures contracts and translation of assets and liabilities in foreign currencies		9,376,736			7,873,753			14,934,575			38,239,207			(125,356	)		478,745
Net increase in net assets resulting from operations		9,938,170			8,002,736			17,419,479			39,995,232			843,680			1,043,376
Distributions to shareholders (Note 2):
From net investment income		(827,092	)		(573,534	)		-			-			(92,443	)		(103,437	)
Class I		-			-			(1,060,658	)		(1,343,883	)		-			-
Class II		-			-			(2,843,739	)		(3,190,498	)		-			-
Class III		-			-			(2,331,952	)		(2,549,489	)		-			-
Total distributions from net investment income		(827,092	)		(573,534	)		(6,236,349	)		(7,083,870	)		(92,443	)		(103,437	)
Tax return of capital		(32,205	)
Class I		-			-			(5,900	)		-			-			-
Class II		-			-			(13,202	)		-			-			-
Class III		-			-			(10,069	)		-			-			-
Total tax return of capital		(32,205	)		-			(29,171	)		-			-			-
Net fund share transactions (Note 5):
Class I		-			-			(11,332,021	)		1,433			-			-
Class II		-			-			(6,849,410	)		(19,877,415	)		-			-
Class III		-			-			(3,611,884	)		(11,810,653	)		-			-
Net fund share transactions (Note 5)		41,779,858			18,193,811			-			-			(2,403,046	)		493,476
Total increase (decrease) in net assets		50,858,731			25,623,013			(10,639,356	)		1,224,727			(1,651,809	)		1,433,415
Net assets:
Beginning of year		82,897,734			57,274,721			406,336,406			405,111,679			22,893,632			21,460,217
End of year	$	133,756,465		$	82,897,734		$	395,697,050		$	406,336,406		$	21,241,823		$	22,893,632
Undistributed net investment income (distributions in excess of net investment income) included in net assets at end of the year	$	(2,618	)	$	(33,074	)	$	(57,938	)	$	(10,102	)	$	(7,532	)	$	(2,794	)

The accompanying notes are an integral part of the financial statements.

48

49

MML Series Investment Fund – Financial Statements (Continued)

Statements of Changes in Net Assets

	MML OTC 100 Fund						MML Small Cap Growth Equity Fund						MML Emerging Growth Fund
	Year Ended December 31, 2005			Year Ended December 31, 2004			Year Ended December 31, 2005			Year Ended December 31, 2004			Year Ended December 31, 2005			Year Ended December 31, 2004
Increase (Decrease) in Net Assets:
Operations:
Net investment income (loss)	$	2,847		$	73,701		$	(366,202	)	$	(320,690	)	$	(121,306	)	$	(114,655	)
Net realized gain on investment transactions, futures contracts and translation of assets and liabilities in foreign currencies		923,583			772,116			4,654,510			3,138,016			898,014			734,464
Net change in unrealized appreciation (depreciation) on investments		(878,675	)		153,050			5,548,935			4,254,359			(656,201	)		1,032,165
Net increase in net assets resulting from operations		47,755			998,867			9,837,243			7,071,685			120,507			1,651,974
Distributions to shareholders (Note 2):
From net investment income		(4,405	)		(71,288	)		-			-			-			-
Net fund share transactions (Note 5)		(2,769,904	)		(978,802	)		33,161,807			7,250,402			(449,466	)		2,419,889
Total increase (decrease) in net assets		(2,726,554	)		(51,223	)		42,999,050			14,322,087			(328,959	)		4,071,863
Net assets:
Beginning of year		12,223,029			12,274,252			62,008,988			47,686,901			14,135,906			10,064,043
End of year	$	9,496,475		$	12,223,029		$	105,008,038		$	62,008,988		$	13,806,947		$	14,135,906
Undistributed net investment income (distributions in excess of net investment income) included in net assets at end of the year	$	(1,561	)	$	885		$	(17,038	)	$	(5,543	)	$	(4,337	)	$	(2,256	)

The accompanying notes are an integral part of the financial statements.

50

51

MML Large Cap Value Fund – Financial Statements (Continued)

Financial Highlights (For a share outstanding throughout each period)

	Year ended 12/31/05††			Year ended 12/31/04			Year ended 12/31/03			Year ended 12/31/02			Year ended 12/31/01
Net asset value, beginning of year	$	10.38		$	9.35		$	7.26		$	8.73		$	9.86
Income (loss) from investment operations:
Net investment income		0.09	*		0.06			0.06			0.05			0.03
Net realized and unrealized gain (loss) on investments		0.87			1.04			2.09			(1.47	)		(1.13	)
Total income (loss) from investment operations		0.96			1.10			2.15			(1.42	)		(1.10	)
Less distributions to shareholders:
From net investment income		(0.07	)		(0.07	)		(0.06	)		(0.05	)		(0.03	)
Tax return of capital		(0.00	)†		-			-			(0.00	)†		-
Total distributions		(0.07	)		(0.07	)		(0.06	)		(0.05	)		(0.03	)
Net asset value, end of year	$	11.27		$	10.38		$	9.35		$	7.26		$	8.73
Total Return(a)		9.38	%		11.79	%		29.60	%		(16.23	)%		(11.16	)%
Ratios / Supplemental Data:
Net assets, end of year (000's)	$	133,756		$	82,898		$	57,275		$	33,919		$	36,171
Ratio of expenses to average daily net assets:
Before expense waiver		0.89	%		0.87	%		0.92	%		0.92	%		0.87	%
After expense waiver#		N/A			0.87	%(b)		0.90	%(b)		0.90	%(b)		N/A
Net investment income to average daily net assets		0.81	%		0.78	%		0.79	%		0.61	%		0.48	%
Portfolio turnover rate		3	%		3	%		7	%		32	%		19	%

†  Tax return of capital is less than $0.01 per share.

††  Effective January 1, 2005, rebated brokerage commissions are included with realized gain and loss on investment transactions. Prior to January 1, 2005, these amounts were presented as a reduction of expenses. Prior year amounts have not been restated to reflect this change due to immateriality. (See Note 3).

*  Per share amount calculated on the average share method.

#  Computed after giving effect to an agreement by MassMutual to waive certain fees and expenses of the Fund for the years ended December 31, 2002 and 2003.

(a)  Total Return information shown in the Financial Highlights table does not reflect expenses that apply at the separate account level or to related insurance products. Inclusion of these charges would reduce the total return figures for all periods shown.

(b)  The Fund has entered into agreements with certain brokers to rebate a portion of brokerage commissions. The rebated commissions are used to reduce operating expenses of the Fund.

The accompanying notes are an integral part of the financial statements.

52

MML Equity Index Fund – Financial Statements (Continued)

Financial Highlights (For a share outstanding throughout each period)

	Class I
	Year ended 12/31/05			Year ended 12/31/04			Year ended 12/31/03			Year ended 12/31/02			Year ended 12/31/01
Net asset value, beginning of year	$	14.90		$	13.71		$	10.83		$	14.14		$	16.27
Income (loss) from investment operations:
Net investment income		0.21	***		0.22	***		0.16	***		0.14	***		0.14	***
Net realized and unrealized gain (loss) on investments		0.47			1.21			2.88			(3.31	)		(2.14	)
Total income (loss) from investment operations		0.68			1.43			3.04			(3.17	)		(2.00	)
Less distributions to shareholders:
From net investment income		(0.22	)		(0.24	)		(0.16	)		(0.14	)		(0.07	)
Tax return of capital		(0.00	)†		-			-			-			-
From net realized gains		-			-			-			-			(0.06	)
Total distributions		(0.22	)		(0.24	)		(0.16	)		(0.14	)		(0.13	)
Net asset value, end of year	$	15.36		$	14.90		$	13.71		$	10.83		$	14.14
Total Return(a)		4.53	%		10.42	%		28.08	%		(22.46	)%		(12.32	)%
Ratios / Supplemental Data:
Net assets, end of year (000's)	$	76,012		$	85,138		$	78,597		$	58,454		$	81,535
Ratio of expenses to average daily net assets:
Before expense waiver		0.48	%		0.44	%		0.44	%		0.44	%		0.45	%
After expense waiver#		0.45	%		N/A			N/A			N/A			N/A
Net investment income to average daily net assets		1.42	%		1.60	%		1.37	%		1.16	%		0.92	%
Portfolio turnover rate		4	%		4	%		5	%		6	%		5	%
	Class II
	Year ended 12/31/05			Year ended 12/31/04			Year ended 12/31/03			Year ended 12/31/02			Year ended 12/31/01
Net asset value, beginning of year	$	14.89		$	13.70		$	10.82		$	14.13		$	16.26
Income (loss) from investment operations:
Net investment income		0.24	***		0.25	***		0.19	***		0.17	***		0.16	***
Net realized and unrealized gain (loss) on investments		0.45			1.20			2.87			(3.32	)		(2.14	)
Total income (loss) from investment operations		0.69			1.45			3.06			(3.15	)		(1.98	)
Less distributions to shareholders:
From net investment income		(0.24	)		(0.26	)		(0.18	)		(0.16	)		(0.09	)
Tax return of capital		(0.00	)†		-			-			-			-
From net realized gains		-			-			-			-			(0.06	)
Total distributions		(0.24	)		(0.26	)		(0.18	)		(0.16	)		(0.15	)
Net asset value, end of year	$	15.34		$	14.89		$	13.70		$	10.82		$	14.13
Total Return(a)		4.65	%		10.60	%		28.31	%		(22.29	)%		(12.18	)%
Ratios / Supplemental Data:
Net assets, end of year (000's)	$	182,390		$	184,271		$	188,869		$	125,942		$	74,636
Ratio of expenses to average daily net assets:
Before expense waiver		0.37	%		0.33	%		0.33	%		0.33	%		0.34	%
After expense waiver#		0.29	%		0.27	%		0.25	%		0.26	%		0.29	%
Net investment income to average daily net assets		1.59	%		1.75	%		1.56	%		1.37	%		1.08	%
Portfolio turnover rate		4	%		4	%		5	%		6	%		5	%

†  Tax return of capital is less than $0.01 per share.

***  Per share amount calculated on the average shares method.

#  Computed after giving effect to an agreement by MassMutual to waive certain fees and expenses of the Fund for the years ended December 31, 2001, 2002, 2003, 2004 and 2005.

(a)  Total Return information shown in the Financial Highlights table does not reflect expenses that apply at the separate account level or to related insurance products. Inclusion of these charges would reduce the total return figures for all periods shown.

The accompanying notes are an integral part of the financial statements.

53

MML Equity Index Fund – Financial Statements (Continued)

Financial Highlights (For a share outstanding throughout each period)

	Class III
	Year ended 12/31/05			Year ended 12/31/04			Year ended 12/31/03			Year ended 12/31/02			Year ended 12/31/01
Net asset value, beginning of year	$	14.86		$	13.67		$	10.80		$	14.10		$	16.27
Income (loss) from investment operations:
Net investment income		0.26	***		0.26	***		0.20	***		0.18	***		0.19	***
Net realized and unrealized gain (loss) on investments		0.46			1.21			2.86			(3.31	)		(2.19	)
Total income (loss) from investment operations		0.72			1.47			3.06			(3.13	)		(2.00	)
Less distributions to shareholders:
From net investment income		(0.27	)		(0.28	)		(0.19	)		(0.17	)		(0.11	)
Tax return of capital		(0.00	)†		-			-			-			-
From net realized gains		-			-			-			-			(0.06	)
Total distributions		(0.27	)		(0.28	)		(0.19	)		(0.17	)		(0.17	)
Net asset value, end of year	$	15.31		$	14.86		$	13.67		$	10.80		$	14.10
Total Return(a)		4.80	%		10.77	%		28.38	%		(22.18	)%		(12.30	)%
Ratios / Supplemental Data:
Net assets, end of year (000's)	$	137,295		$	136,927		$	137,646		$	115,070		$	154,588
Ratio of expenses to average daily net assets:
Before expense waiver		0.23	%		0.19	%		0.19	%		0.19	%		0.20	%
After expense waiver##		0.15	%		0.14	%		0.14	%		0.14	%		0.15	%
Net investment income to average daily net assets		1.72	%		1.88	%		1.67	%		1.46	%		1.32	%
Portfolio turnover rate		4	%		4	%		5	%		6	%		5	%

†  Tax return of capital is less than $0.01 per share.

***  Per share amount calculated on the average shares method.

##  Computed after giving effect to an agreement by MassMutual to waive certain fees and expenses of the Fund for the years ended December 31, 2001, 2002, 2003, 2004 and 2005.

(a)  Total Return information shown in the Financial Highlights table does not reflect expenses that apply at the separate account level or to related insurance products. Inclusion of these charges would reduce the total return figures for all periods shown.

The accompanying notes are an integral part of the financial statements.

54

MML Growth Equity Fund – Financial Statements (Continued)

Financial Highlights (For a share outstanding throughout each period)

	Year ended 12/31/05†††			Year ended 12/31/04			Year ended 12/31/03			Year ended 12/31/02			Year ended 12/31/01
Net asset value, beginning of year	$	7.03		$	6.74		$	5.48		$	7.59		$	10.15
Income (loss) from investment operations:
Net investment income (loss)		0.03			0.03			0.00	†		(0.01	)		(0.00	)†
Net realized and unrealized gain (loss) on investments		0.24			0.29			1.26			(2.10	)		(2.56	)
Total income (loss) from investment operations		0.27			0.32			1.26			(2.11	)		(2.56	)
Less distributions to shareholders:
From net investment income		(0.03	)		(0.03	)		(0.00	)††		-			(0.00	)††
Net asset value, end of year	$	7.27		$	7.03		$	6.74		$	5.48		$	7.59
Total Return(a)		3.86	%		4.78	%		23.02	%		(27.80	)%		(25.20	)%
Ratios / Supplemental Data:
Net assets, end of year (000's)	$	21,242		$	22,894		$	21,460		$	16,568		$	44,745
Ratio of expenses to average daily net assets:
Before expense waiver		1.05	%		1.00	%		1.28	%		1.08	%		0.99	%
After expense waiver#		0.91	%		0.89	%(b)		0.86	%(b)		0.89	%(b)		0.91	%
Net investment income (loss) to average daily net assets		0.40	%		0.47	%		0.02	%		(0.10	)%		(0.06	)%
Portfolio turnover rate		85	%		184	%		271	%		219	%		292	%

†  Net investment income (loss) is less than $0.01 per share.

††  Distributions from net investment income are less than $0.01 per share.

†††  Effective January 1, 2005, rebated brokerage commissions are included with realized gain or loss on investment transactions. Prior to January 1, 2005, these amounts were presented as a reduction of expenses. Prior year amounts have not been restated to reflect this change due to immateriality. (See Note 3).

#  Computed after giving effect to an agreement by MassMutual to waive certain fees and expenses of the Fund for the years ended December 31,2001, 2002, 2003, 2004 and 2005.

(a)  Total Return information shown in the Financial Highlights table does not reflect expenses that apply at the separate account level or to related insurance products. Inclusion of these charges would reduce the total return figures for all periods shown.

(b)  The Fund has entered into an agreement with certain brokers to rebate a portion of brokerage commissions. The related commissions are used to reduce operating expenses of the Fund.

The accompanying notes are an integral part of the financial statements.

55

MML OTC 100 Fund – Financial Statements (Continued)

Financial Highlights (For a share outstanding throughout each period)

	Year ended 12/31/05			Year ended 12/31/04			Year ended 12/31/03			Year ended 12/31/02			Year ended 12/31/01
Net asset value, beginning of year	$	4.13		$	3.76		$	2.53		$	4.06		$	6.07
Income (loss) from investment operations:
Net investment income (loss)		0.00	†***		0.02			(0.01	)		(0.02	)		(0.02	)***
Net realized and unrealized gain (loss) on investments		0.05			0.37			1.24			(1.51	)		(1.99	)
Total income (loss) from investment operations		0.05			0.39			1.23			(1.53	)		(2.01	)
Less distributions to shareholders:
From net investment income		(0.00	)†		(0.02	)		-			-			-
From net realized gains		-			-			-			-			(0.00	)†
Total distributions		(0.00	)		(0.02	)		-			-			(0.00	)
Net asset value, end of year	$	4.18		$	4.13		$	3.76		$	2.53		$	4.06
Total Return(a)		1.26	%		10.48	%		48.62	%		(37.68	)%		(33.11	)%
Ratios / Supplemental Data:
Net assets, end of year (000's)	$	9,496		$	12,223		$	12,274		$	4,096		$	10,749
Ratio of expenses to average daily net assets:
Before expense waiver		0.86	%		0.77	%		1.22	%		1.08	%		0.71	%
After expense waiver#		0.56	%		0.56	%		0.56	%		0.56	%		0.56	%
Net investment income (loss) to average daily net assets		0.03	%		0.63	%		(0.31	)%		(0.45	)%		(0.40	)%
Portfolio turnover rate		23	%		35	%		48	%		64	%		67	%

***  Per share amount calculated on the average shares method.

†  Net investment income and distributions from net investment income and realized gains are less than $0.01 per share.

#  Computed after giving effect to an agreement by MassMutual to waive certain fees and expenses of the Fund for the years ended December 31, 2001, 2002, 2003, 2004 and 2005.

(a)  Total Return information shown in the Financial Highlights table does not reflect expenses that apply at the separate account level or to related insurance products. Inclusion of these charges would reduce the total return figures for all periods shown.

The accompanying notes are an integral part of the financial statements.

56

MML Small Cap Growth Equity Fund – Financial Statements (Continued)

Financial Highlights (For a share outstanding throughout each period)

	Year ended 12/31/05†			Year ended 12/31/04			Year ended 12/31/03			Year ended 12/31/02			Year ended 12/31/01
Net asset value, beginning of year	$	13.21		$	11.66		$	7.85		$	10.60		$	12.20
Income (loss) from investment operations:
Net investment loss		(0.05	)		(0.07	)		(0.07	)		(0.09	)		(0.06	)
Net realized and unrealized gain (loss) on investments		1.57			1.62			3.88			(2.66	)		(1.49	)
Total income (loss) from investment operations		1.52			1.55			3.81			(2.75	)		(1.55	)
Less distributions to shareholders:
From net realized gains		-			-			-			-			(0.05	)
Net asset value, end of year	$	14.73		$	13.21		$	11.66		$	7.85		$	10.60
Total Return(a)		11.58	%		13.29	%		48.54	%		(25.94	)%		(12.71	)%
Ratios / Supplemental Data:
Net assets, end of year (000's)	$	105,008		$	62,009		$	47,687		$	26,784		$	48,983
Ratio of expenses to average daily net assets:
Before expense waiver		1.22	%		1.21	%		1.25	%		1.24	%		1.15	%
After expense waiver#		1.18	%		1.14	%(b)		1.16	%(b)		1.16	%(b)		N/A
Net investment loss to average daily net assets		(0.48	)%		(0.63	)%		(0.79	)%		(0.84	)%		(0.46	)%
Portfolio turnover rate		61	%		62	%		59	%		53	%		104	%

†  Effective January 1, 2005, rebated brokerage commissions are included with realized gain or loss on investment transactions. Prior to January 1, 2005, these amounts were presented as a reduction of expenses. Prior year amounts have not been restated to reflect this change due to immateriality. (see Note 3).

#  Computed after giving effect to an agreement by MassMutual to waive certain fees and expenses of the Fund for the years ended December 31, 2002, 2003, 2004 and 2005.

(a)  Total Return information shown in the Financial Highlights table does not reflect expenses that apply at the separate account level or to related insurance products. Inclusion of these charges would reduce the total return figures for all periods shown.

(b)  The Fund has entered into an agreement with certain brokers to rebate a portion of brokerage commissions. The rebated commissions are used to reduce operating expenses of the Fund.

The accompanying notes are an integral part of the financial statements.

57

MML Emerging Growth Fund – Financial Statements (Continued)

Financial Highlights (For a share outstanding throughout each period)

	Year ended 12/31/05			Year ended 12/31/04			Year ended 12/31/03			Year ended 12/31/02			Year ended 12/31/01
Net asset value, beginning of year	$	5.92		$	5.16		$	3.54		$	6.15		$	7.34
Income (loss) from investment operations:
Net investment loss		(0.05	)		(0.05	)		(0.04	)		(0.05	)***		(0.04	)
Net realized and unrealized gain (loss) on investments		0.10			0.81			1.66			(2.56	)		(1.15	)
Total income (loss) from investment operations		0.05			0.76			1.62			(2.61	)		(1.19	)
Net asset value, end of year	$	5.97		$	5.92		$	5.16		$	3.54		$	6.15
Total Return(a)		0.84	%		14.73	%		45.76	%		(42.44	)%		(16.33	)%
Ratios / Supplemental Data:
Net assets, end of year (000's)	$	13,807		$	14,136		$	10,064		$	4,333		$	12,184
Ratio of expenses to average daily net assets:
Before expense waiver		1.51	%		1.62	%		2.28	%		1.76	%		1.37	%
After expense waiver#		1.16	%		1.16	%		1.16	%		1.16	%		1.16	%
Net investment loss to average daily net assets		(0.91	)%		(0.97	)%		(1.09	)%		(1.09	)%		(0.81	)%
Portfolio turnover rate		127	%		184	%		195	%		190	%		139	%

***  Per share amount calculated on the average shares method.

#  Computed after giving effect to an agreement by MassMutual to waive certain fees and expenses of the Fund for the years ended December 31, 2001, 2002, 2003, 2004 and 2005.

(a)  Total Return information shown in the Financial Highlights table does not reflect expenses that apply at the separate account level or to related insurance products. Inclusion of these charges would reduce the total return figures for all periods shown.

The accompanying notes are an integral part of the financial statements.

58

Notes to Financial Statements

1.  The Fund
  MML Series Investment Fund ("MML Trust") is registered under the Investment Company Act of 1940, as amended (the "1940 Act"), as a no-load, open-end, management investment company. The Trust is organized under the laws of the Commonwealth of Massachusetts as a Massachusetts business trust pursuant to an Agreement and Declaration of Trust dated May 14, 1993, as amended. The following are six series of the Trust (each individually referred to as a "Fund" or collectively as the "Funds"): MML Large Cap Value Fund ("Large Cap Value Fund"), MML Equity Index Fund ("Equity Index Fund"), MML Growth Equity Fund ("Growth Equity Fund"), MML OTC 100 Fund ("OTC 100 Fund"), MML Small Cap Growth Equity Fund ("Small Cap Growth Equity Fund") and MML Emerging Growth Fund ("Emerging Growth Fund").

The MML Trust was established by Massachusetts Mutual Life Insurance Company ("MassMutual") for the purpose of providing vehicles for the investment of assets of various separate investment accounts established by MassMutual and by life insurance companies which are subsidiaries of MassMutual. Shares of MML Trust are not offered to the general public.

The Equity Index Fund offers three classes of shares: Class I, Class II and Class III. Each share class invests in the same portfolio of assets. The principal difference among the classes is the level of service and administration fees borne by the classes. Because each class will have different fees and expenses, performance and share prices among the classes will vary. The classes of shares are offered to different types of investors, as outlined in the Fund's Prospectus.

After the close of business on April 29, 2005, each of the MML Money Market Fund, MML Inflation-Protected Bond Fund, MML Managed Bond Fund, MML Blend Fund, MML Equity Fund, MML Enhanced Index Core Equity Fund, MML Small Cap Equity Fund and MML Small Company Opportunities Fund, each a fund of MML Series Investment Fund II (each a "New Fund"), acquired all of the assets and liabilities of the MML Money Market Fund, MML Inflation-Protected Bond Fund, MML Managed Bond Fund, MML Blend Fund, MML Equity Fund, MML Enhanced Index Core Equity Fund, MML Small Cap Equity Fund and MML Small Company Opportunities Fund, each a fund of MML Series Investment Fund (each a "Fund"), respectively, pursuant to agreements and plans of reorganization that were approved by each Fund's respective shareholders on April 18, 2005. Each acquisition was accomplished by a tax-free transfer of all the assets of each Fund to the corresponding New Fund in exchange for shares of the New Fund and the assumption by the New Fund of all of the liabilities of the Fund. Information with respect to the Special Meeting of Shareholders of each Fund that was held on April 18, 2005 can be found in the December 31, 2005 annual report for MML Series Investment Fund II.

2.  Significant Accounting Policies
  The following is a summary of significant accounting policies followed consistently by each Fund in the preparation of the financial statements in conformity with accounting principles generally accepted in the United States of America ("generally accepted accounting principles"). The preparation of the financial statements in accordance with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts and disclosures in the financial statements. Actual results could differ from those estimates.

Investment Valuation
  Equity securities are valued on the basis of valuations furnished by a pricing service, authorized by the Board of Trustees ("Trustees"), which provides the last reported sale price for securities listed on a national securities exchange or the official closing price on the NASDAQ National Market System, or in the case of over-the-counter securities not so listed, the last reported bid price. Debt securities (other than short-term obligations with a remaining maturity of sixty days or less) are valued on the basis of valuations furnished by a pricing service, authorized by the Trustees, which determines valuations taking into account appropriate factors such as institutional-size trading in similar groups of securities, yield, quality, coupon rate, m aturity, type of issue, trading characteristics and other market data. Short-term securities with a remaining maturity of sixty days or less are valued at either amortized cost or at original cost plus accrued interest, whichever approximates current market value. All other securities and other assets, including futures, options, swaps and debt securities for which the prices supplied by

59

Notes to Financial Statements (Continued)

a pricing agent are deemed by the Trustees not to be representative of market values, including restricted securities and securities for which no market quotation is available, are valued at fair value in accordance with procedures approved by and determined in good faith by the Trustees, although the actual calculation may be done by others. Securities are typically valued on the basis of valuations furnished by a primary pricing service or, if no such valuation is available, from a secondary pricing service. However, valuation methods approved by the Trustees which are intended to reflect fair value may be used when pricing service information is not readily available or when a security's value is believed to have been materially affected by a significant event, such as a natural disaster, an economic event like a bankruptcy filing, or a substantial fluctuation in domestic or foreign markets, that has occurred after the close of the exchan ge or market on which the security is principally traded (for example, a foreign exchange or market). In such a case, a Fund's value for a security is likely to be different from the last quoted market price or pricing service information. Due to the subjective and variable nature of fair value pricing, it is possible that the value determined for a particular asset may be materially different from the value realized upon such asset's sale.

Portfolio securities traded on more than one national securities exchange are valued at the last price on the business day as of which such value is being determined at the close of the exchange representing the principal market for such securities. All assets and liabilities expressed in foreign currencies are converted into U.S. dollars at the mean between the buying and selling rates of such currencies against U.S. dollars last quoted by any major bank. If such quotations are not available, the rate of exchange is determined in accordance with policies established by the Trustees.

Securities Lending
  Each Fund may lend its securities to qualified brokers; however, securities lending cannot exceed 33% of the total assets of the Funds taken at current value. The loans are collateralized at all times with cash or securities with a market value at least equal to 100% of the market value of the securities on loan. The market value of the loaned securities is determined at the close of business of the Fund and any additional collateral is delivered to the Fund the next business day. As with other extensions of credit, the Funds may bear the risk of delay in recovery or even loss of rights in the collateral should the borrower of the securities fail financially. The Funds receive compensation for lending their securities. At December 31, 2005, the Funds l oaned securities having the following market values, collateralized by cash, which was invested in short-term instruments in the following amounts:

	Securities on Loan		Collateral
Large Cap Value Fund	$	17,655,219	$	18,141,882
Equity Index Fund		29,856,824		31,128,588
Growth Equity Fund		2,188,716		2,263,184
Small Cap Growth Equity Fund		18,934,409		19,769,686

For each Fund the amount of securities on loan indicated in the table above may not correspond with the securities on loan identified on the Portfolio of Investments because securities with pending sales are in process of recall from the brokers. At December 31, 2005, the Equity Index Fund had securities on loan with pending sales with a market value of $29,471.

The Trust receives, as fees, a share of the income earned on investment of the cash collateral received for for the loan of securities. For the year ended December 31, 2005, the Trust earned securities lending income and paid securities lending fees and expenses as follows:

	Securities Lending Gross Income		Securities Lending Fees and Expenses			Securities Lending Net Income
Large Cap Value Fund	$	519,945	$	(508,822	)	$	11,123
Equity Index Fund		1,046,123		(1,015,990	)		30,133
Growth Equity Fund		74,062		(72,121	)		1,941
Small Cap Growth Equity Fund		516,326		(449,327	)		66,999

60

Notes to Financial Statements (Continued)

Repurchase Agreements
  Each Fund may enter into repurchase agreements with certain banks and broker/dealers whereby a Fund acquires a security for cash and obtains a simultaneous commitment from the seller to repurchase the security at an agreed upon price and date. The Funds, through their custodian, take possession of the securities collateralizing the repurchase agreement. The collateral is marked to market daily to ensure that the market value of the underlying assets remains sufficient to protect the Funds in the event of default by the seller. Collateral for certain tri-party repurchase agreements is held at the counterparty's custodian in a segregated account for the benefit of the Funds and the counterparty. In connection with transactions in repurchase agreements , if the seller defaults and the value of the collateral declines or if the seller enters insolvency proceedings, realization of collateral by the Funds may be delayed or limited.

Accounting for Investments
  Investment transactions are accounted for on the trade date. Realized gains and losses on sales of investments and unrealized appreciation and depreciation of investments are computed on the specific identification cost method. Interest income, adjusted for amortization of discounts and premiums on debt securities, is earned from the settlement date and is recorded on the accrual basis. Dividend income is recorded on the ex-dividend date.

Federal Income Tax
  It is each Fund's intent to continue to comply with the provisions of subchapter M of the Internal Revenue Code of 1986, as amended (the "Code"), applicable to a regulated investment company. Under such provisions, the Funds will not be subject to federal income taxes on their ordinary income and net realized capital gains to the extent they are distributed or deemed to have been distributed to their shareholders. Therefore, no Federal income tax provision is required. Withholding taxes on foreign interest, dividends, and capital gains have been provided for in accordance with the applicable country's tax rules and rates.

Dividends and Distributions to Shareholders
  Dividends from net investment income and distributions of any net realized capital gains of each Fund are declared and paid annually and at other times as may be required to satisfy tax or regulatory requirements. Distributions to shareholders are recorded on the ex-dividend date. Income and capital gain distributions are determined in accordance with income tax regulations, which may differ from generally accepted accounting principles. These differences are primarily due to investments in passive foreign investment companies and the deferral of wash sale losses. As a result, net investment income and net realized gain on investment transactions for a reporting period may differ significantly from distributions during such per iod.

Accordingly, the Funds may periodically make reclassifications among certain of their capital accounts without impacting the net asset value of the Funds.

During the year ended December 31, 2005, the following amounts were reclassified due to differences between book and tax accounting.

	Paid-in Capital			Accumulated Net Realized Gain (Loss) on Investments			Undistributed Net Investment Income
Large Cap Value Fund	$	(32,206	)	$	(32,354	)	$	64,560
Equity Index Fund		(70,186	)		102,309			(32,123	)
Growth Equity Fund		(3,138	)		4,721			(1,583	)
OTC 100 Fund		-			888			(888	)
Small Cap Growth Equity Fund		(365,813	)		11,106			354,707
Emerging Growth Fund		(122,209	)		2,984			119,225

61

Notes to Financial Statements (Continued)

Foreign Currency Translation
  The books and records of the Funds are maintained in U.S. dollars. The market values of foreign currencies, foreign securities and other assets and liabilities denominated in foreign currencies are translated into U.S. dollars at the mean of the buying and selling rates of such currencies against the U.S. dollar at the end of each business day. Purchases and sales of foreign securities and income and expense items are translated at the rates of exchange prevailing on the respective dates of such transactions. The Funds do not isolate that portion of the results of operations arising from changes in the exchange rates from that portion arising from changes in the market prices of securities. Net realized foreign currency gains and losses resul ting from changes in exchange rates include foreign currency gains and losses between trade date and settlement date on investment securities transactions, foreign currency transactions and the difference between the amounts of dividends recorded on the books of the Funds and the amount actually received.

Forward Foreign Currency Contracts
  Each Fund may enter into forward foreign currency contracts in order to hedge the effect of currency movements of foreign denominated securities or obligations. A forward foreign currency contract is an agreement between two parties to buy and sell a currency at a set price on a future date. The market value of a forward foreign currency contract fluctuates with changes in foreign currency exchange and interest rates. Forward foreign currency contracts are marked to market daily and the change in their value is recorded by the Funds as an unrealized gain or loss. When a forward foreign currency contract is extinguished, through delivery or offset by ente ring into another forward foreign currency contract, the Funds record a realized gain or loss equal to the difference between the value of the contract at the time it was opened and the value of the contract at the time it was extinguished or offset.

Forward foreign currency contracts involve a risk of loss from the potential inability of counterparties to meet the terms of their contracts and from unanticipated movements in foreign currency values and interest rates.

The notional or contractual amounts of these instruments represent the investments the Funds have in particular classes of financial instruments and do not necessarily represent the amounts potentially subject to risk. The measurement of the risk associated with these instruments is meaningful only when all related and offsetting transactions are considered.

At December 31, 2005, the Funds had no open forward foreign currency contracts.

Delayed Delivery Transactions, When Issued Securities, and Forward Commitments  Each Fund may purchase or sell securities on a "when issued" or delayed delivery or on a forward commitment basis. The Funds use forward commitments to manage interest rate exposure or as a temporary substitute for purchasing or selling particular debt securities. Payment and delivery may take place after the customary settlement period for that security. The price of the underlying securities and the date when the securities will be delivered and paid for are fixed at the time the transaction is negotiated. These securities are valued on the basis of valuations furnished by a pricing service, authorized by the Trustees, which determines valuations taking into account appropriate factors such as institutional-size trading in similar groups of securities, yield, quality, coupon rate, maturity, type of issue, trading characteristics and other market data. Securities for which no market quotation is available, are valued at fair value in accordance with procedures approved by and determined in good faith by the Trustees, although the actual calculation may be done by others. The Funds record on a daily basis the unrealized appreciation (depreciation) based upon changes in the value of these securities. When a forward commitment contract is closed, the Funds record a realized gain or loss equal to the difference between the value of the contract at the time it was opened and the value of the contract at the time it was closed. Losses may arise due to changes in the value of the underlying securities or if the counterparty does not perform under the contract, or if the issuer does not issue the securities due to political, economic, or other factors. Funds monitor exposure to ensure counterparties are creditworthy and concentration of exposure is minimized.

At December 31, 2005, the Funds had no open delayed delivery transactions, when issued securities or forward commitments.

62

Notes to Financial Statements (Continued)

Financial Futures Contracts
  The Funds may purchase or sell financial futures contracts and options on such futures contracts for the purpose of hedging the market risk on existing securities or as a substitute for the purchase of securities. Futures contracts are contracts for delayed delivery of securities at a specific future date and at a specific price or yield. Upon entering into a contract, the Funds deposit and maintain as collateral such initial margin as required by the exchange on which the transaction is effected. Pursuant to the contract, the Fund agrees to receive from or pay to the broker an amount of cash equal to the daily fluctuation in value of the contract. Such receipts or payments are known as variation margin and are recorded by the Funds as unreali zed gains or losses. When the contract is closed, each Fund records a realized gain or loss equal to the difference between the value of the contract at the time it was opened and the value at the time it was closed. Futures contracts are valued at the settlement price established each day by the board of trade or exchange on which they are traded.

A summary of open futures contracts for the Equity Index Fund, the Growth Equity Fund, and the OTC 100 Fund at December 31, 2005, is as follows:

Number of Contracts	Type	Expiration Date	Notional Contract Value		Net Unrealized Depreciation
MML Equity Index Fund
BUYS 39	S&P 500 Index	03/17/06	$	2,446,860	$	(28,290	)
MML Growth Equity Fund
BUYS 1	S&P 500 Index	03/17/06		313,700		(3,800	)
MML OTC 100 Fund
BUYS 8	NASDAQ 100 Index	03/18/06		265,440		(4,691	)

Allocation of Operating Activity
  In maintaining the records for the Equity Index Fund, the income and expense accounts are allocated to each class of shares. Investment income, unrealized and realized gains or losses are prorated among the classes of shares based on the relative net assets of each. Expenses are allocated to each class of shares depending on the nature of the expenditures. Administration fees, which are directly attributable to a class of shares, are charged to that class' operations. Expenses of the Fund not directly attributable to the operations of any class of shares are prorated among the classes to which the expense relates based on the relative net assets of each.

Foreign Securities  The Funds may also invest in foreign securities, subject to certain percentage restrictions. Investing in securities of foreign companies and foreign governments involves special risks and considerations not typically associated with investing in securities issued by U.S. companies and the U.S. Government. These risks include revaluation of currencies and future adverse political and economic developments. Moreover, securities of many foreign companies and foreign governments and their markets may be less liquid and their prices more volatile than those of securities of comparable U.S. companies and the U.S. Government.

63

Notes to Financial Statements (Continued)

3.  Management Fees and Other Transactions

Investment Management Fees
  Under agreements between the Trust and MassMutual on behalf of each Fund, MassMutual is responsible for providing investment management services for each Fund. In return for this service, MassMutual receives advisory fees quarterly based on the following annual rates.

For the Large Cap Value Fund, MassMutual receives a fee from the Fund at an annual rate of 0.80% on the first $100,000,000, 0.75% on the next $400,000,000 and 0.70% on assets over $500,000,000, of the average daily net asset value of the Fund.

For the Equity Index Fund, MassMutual receives a fee from the Fund at an annual rate of 0.10% of the average daily net asset value of the Fund.

For the Growth Equity Fund, MassMutual receives a fee from the Fund at an annual rate of 0.80% on the first $300,000,000, 0.77% on the next $300,000,000, 0.75% on the next $300,000,0000, 0.72% on the next $600,000,000 and 0.65% on assets over $1,500,000,000, of the average daily net asset value of the Fund.

For the OTC 100 Fund, MassMutual receives a fee from the Fund at an annual rate of 0.45% on the first $200,000,000, 0.44% on the next $200,000,000 and 0.42% on assets over $400,000,000, of the average daily net asset value of the Fund.

For the Small Cap Growth Equity Fund, MassMutual receives a fee from the Fund at the annual rate of 1.075% on the first $200,000,000, 1.05% on the next $200,000,000, 1.025% on the next $600,000,000 and 1.00% on assets over $1,000,000,000, of the average daily net asset value of the Fund.

For the Emerging Growth Fund, MassMutual receives a fee from the Fund at the annual rate of 1.05% on the first $200,000,000, 1.00% on the next $200,000,000 and 0.95% on assets over $400,000,000, of the average daily net asset value of the Fund.

MassMutual has entered into investment sub-advisory agreements with the following unaffiliated investment sub-advisers; Davis Selected Advisers, L.P. for the Large Cap Value Fund, Northern Trust Investments, N.A. for the Equity Index Fund and the OTC 100 Fund, Grantham, Mayo, Van Otterloo and Co. LLC for the Growth Equity Fund, RS Investment Management L.P. for the Emerging Growth Fund, Waddell & Reed Investment Management Company for a portion of the Small Cap Growth Equity Fund, and Wellington Management Company, LLP for a portion of the Small Cap Growth Equity Fund. MassMutual pays a sub-advisory fee to each of these sub-advisers based upon the aggregate net assets under management which include (1) the average daily net assets of the specified Fund which it manages, and (2) the average daily net assets of all other funds or accounts of MassMutual or its affiliates for which the sub-adviser provides sub-advisory services and which hav e substantially the same investment objectives, policies and investment strategies.

Administration & Shareholder Service Fees  For the Equity Index Fund, under a separate administrative and shareholder services agreement between the Fund and MassMutual, MassMutual provides certain administrative and shareholder services and bears some class specific administrative expenses. In return for these services, MassMutual receives an administrative services fee monthly based upon the average daily net assets of the applicable class of shares of the Fund at the following annual rates: 0.30% on the first $100,000,000, 0.28% on the next $150,000,000 and 0.26% on assets in excess of $250,000,000 of Class I shares of the Fund, 0.19% of the average daily net assets of Class II shares of the Fund, and for Class III shares, an amount not to exceed 0.05% of the average daily net assets of Class III shares.

64

Notes to Financial Statements (Continued)

Expense Waivers
  For all Funds, except the Equity Index Fund, MassMutual has agreed, at least through April 30, 2006, to bear the expenses of the Fund to the extent that the aggregate expenses (excluding the Fund's management fee, interest, taxes, brokerage commissions and extraordinary expenses) incurred during the Fund's fiscal year exceed 0.11% of the average daily net assets of the Fund for such year.

For each class of the Equity Index Fund, MassMutual has agreed, at least through April 30, 2006, to bear the expenses of the Fund, to the extent that the aggregate expenses (excluding the Fund's management and administrative fees, interest, taxes, brokerage commissions and extraordinary expenses) incurred during the Fund's fiscal year exceed 0.05% of the average daily net assets of the Fund for such year. MassMutual has also agreed to waive certain administrative and shareholder service fees payable by the Fund on account of Class II or Class III shares.

Brokerage Commissions  The Large Cap Value Fund and the Small Cap Growth Equity Fund have entered into agreements with certain brokers whereby the brokers will rebate, in cash, a portion of brokerage commissions. Effective January 1, 2005, amounts earned by the Funds under such agreements are included with realized gain or loss on investment transactions presented in the statement of operations. Prior to January 1, 2005, amounts earned by the Funds under such agreements were presented as a reduction of expenses. Prior year amounts have not been restated to reflect this change due to immateriality. For the year ended December 31, 2005, brokerage commissions under these agreements are as follows:

	Commissions
Large Cap Value Fund	$	5,123
Small Cap Growth Equity Fund		19,386

Other
  Certain officers and trustees of the Funds are also officers of MassMutual. The compensation of each trustee who is not an officer of MassMutual is borne by the Funds.

Deferred Compensation
  Trustees of the Funds that are not employees of MassMutual or its subsidiaries may elect to defer receipt of their annual fees in accordance with terms of the Non-Qualified Deferred Compensation Plan. Any amounts deferred shall accrue interest at a rate equal to eight percent (8%) per annum.

For the year ended December 31, 2005, no significant amounts have been deferred.

4.  Purchases and Sales of Investments
  Cost of purchases and proceeds from sales of investment securities (excluding short-term investments) for the year ended December 31, 2005, were as follows:

		Long-Term U.S. Government Securities		Other Long-Term Securities
Purchases	Large Cap Value Fund	$	-	$	42,101,176
	Equity Index Fund		-		17,423,834
	Growth Equity Fund		-		18,421,745
	OTC 100 Fund		-		2,388,175
	Small Cap Growth Equity Fund		-		67,585,737
	Emerging Growth Fund		-		15,842,153
Sales	Large Cap Value Fund	$	-	$	2,835,260
	Equity Index Fund		-		39,701,023
	Growth Equity Fund		-		20,922,263
	OTC 100 Fund		-		5,209,160
	Small Cap Growth Equity Fund		-		41,138,888
	Emerging Growth Fund		-		16,109,712

65

Notes to Financial Statements (Continued)

5.  Capital Share Transactions
  The Funds are authorized to issue an unlimited number of shares, with no par value in each class of shares. Changes in shares outstanding for each Fund are as follows:

	Year ended December 31, 2005						Year ended December 31, 2004
	Shares			Amount			Shares			Amount
Large Cap Value Fund
Sold		4,797,526		$	51,433,898			2,631,604		$	25,654,263
Issued as reinvestment of dividends		75,819			859,292			55,176			573,534
Redeemed		(993,590	)		(10,513,332	)		(829,329	)		(8,033,986	)
Net increase		3,879,755		$	41,779,858			1,857,451		$	18,193,811
Equity Index Fund Class I
Sold		268,067		$	4,013,494			1,190,416		$	16,724,615
Issued as reinvestment of dividends		68,899			1,066,558			90,073			1,343,884
Redeemed		(1,099,955	)		(16,412,073	)		(1,299,529	)		(18,067,066	)
Net increase (decrease)		(762,989	)	$	(11,332,021	)		(19,040	)	$	1,433
Equity Index Fund Class II
Sold		1,309,259		$	19,563,975			1,537,829		$	21,537,619
Issued as reinvestment of dividends		184,796			2,856,941			213,984			3,190,498
Redeemed		(1,980,256	)		(29,270,326	)		(3,163,722	)		(44,605,532	)
Net decrease		(486,201	)	$	(6,849,410	)		(1,411,909	)	$	(19,877,415	)
Equity Index Fund Class III
Sold		37,261		$	572,832			19,216		$	267,033
Issued as reinvestment of dividends		151,784			2,342,021			171,337			2,549,488
Redeemed		(435,899	)		(6,526,737	)		(1,043,953	)		(14,627,174	)
Net decrease		(246,854	)	$	(3,611,884	)		(853,400	)	$	(11,810,653	)
Growth Equity Fund
Sold		436,645		$	3,014,287			623,314		$	4,226,011
Issued as reinvestment of dividends		12,569			92,443			14,687			103,437
Redeemed		(784,162	)		(5,509,776	)		(567,821	)		(3,835,972	)
Net increase (decrease)		(334,948	)	$	(2,403,046	)		70,180		$	493,476
OTC 100 Fund
Sold		441,743		$	1,731,964			1,371,368		$	5,164,134
Issued as reinvestment of dividends		1,039			4,405			17,232			71,288
Redeemed		(1,131,374	)		(4,506,273	)		(1,689,804	)		(6,214,224	)
Net decrease		(688,592	)	$	(2,769,904	)		(301,204	)	$	(978,802	)
Small Cap Growth Equity Fund
Sold		3,182,280		$	43,230,890			1,344,400		$	15,934,204
Issued as reinvestment of dividends		-			-			-			-
Redeemed		(750,195	)		(10,069,083	)		(738,234	)		(8,683,802	)
Net increase		2,432,085		$	33,161,807			606,166		$	7,250,402
Emerging Growth Fund
Sold		387,186		$	2,159,099			1,156,307		$	6,126,885
Issued as reinvestment of dividends		-			-			-			-
Redeemed		(464,574	)		(2,608,565	)		(717,582	)		(3,706,996	)
Net increase (decrease)		(77,388	)	$	(449,466	)		438,725		$	2,419,889

66

Notes to Financial Statements (Continued)

6.  Federal Income Tax Information
  At December 31, 2005, the cost of securities and the unrealized appreciation (depreciation) in the value of investments owned by the Funds, as computed on a Federal income tax basis, were as follows:

	Federal Income Tax Cost		Tax Basis Unrealized Appreciation		Tax Basis Unrealized Depreciation			Net Unrealized Appreciation
Large Cap Value Fund	$	127,351,503	$	26,367,809	$	(2,008,032	)	$	24,359,777
Equity Index Fund		387,779,169		79,364,265		(40,772,660	)		38,591,605
Growth Equity Fund		22,154,030		2,100,777		(733,301	)		1,367,476
OTC 100 Fund		8,533,025		1,533,356		(463,615	)		1,069,741
Small Cap Growth Equity Fund		105,421,490		21,045,750		(2,055,582	)		18,990,168
Emerging Growth Fund		12,615,910		1,604,482		(353,682	)		1,250,800

At December 31, 2005, the following Funds had available, for Federal income tax purposes, unused capital losses:

	Expiring 2008		Expiring 2009		Expiring 2010		Expiring 2011		Expiring 2012		Expiring 2013
Large Cap Value Fund	$	8,346	$	1,160,333	$	2,527,171	$	1,015,022	$	578,706	$	465,641
Equity Index Fund		-		-		6,501,477		110,945		2,351,065		3,224,406
Growth Equity Fund		-		16,099,967		7,953,799		-		-		-
OTC 100 Fund		-		524,374		4,762,508		2,362,711		1,300,985		-
Small Cap Growth Equity Fund		-		2,117,631		8,158,841		930,646		-		-
Emerging Growth Fund		-		4,051,252		3,402,428		-		-		-

Net capital loss carryforwards may be applied against any net realized taxable gains in each succeeding year, or until their respective expiration dates, whichever occurs first.

Certain differences exist from the amounts reflected in the Statement of Changes in Net Assets primarily due to the character of short-term capital gains treated as ordinary income for tax purposes. The tax character of distributions paid during the year ended December 31, 2005 was as follows:

	Ordinary Income		Long Term Capital Gain		Short Term Capital Gain		Return of Capital
Large Cap Value Fund	$	827,092	$	-	$	-	$	32,205
Equity Index Fund		6,236,349		-		-		29,171
Growth Equity Fund		92,443		-		-		-
OTC 100 Fund		4,405		-		-		-

The tax character of distributions paid during the year ended December 31, 2004 was as follows:

	Ordinary Income		Long Term Capital Gain		Return of Capital
Large Cap Value Fund	$	573,534	$	-	$	-
Equity Index Fund		7,083,870		-		-
Growth Equity Fund		92,443		-		-
OTC 100 Fund		71,288

67

Notes to Financial Statements (Continued)

At December 31, 2005, the components of distributable earnings on a tax basis were as follows:

	Undistributed Ordinary Income		Undistributed Long Term Capital Gain/ (Capital Loss Carryover)			Other Temporary Differences			Unrealized Appreciation*
Large Cap Value Fund	$	-	$	(5,755,219	)	$	(59,798	)	$	24,359,776
Equity Index Fund		-		(12,187,893	)		(404,510	)		38,591,605
Growth Equity Fund		-		(24,053,766	)		(7,532	)		1,367,476
OTC 100 Fund		95		(8,950,578	)		(3,873	)		1,069,741
Small Cap Growth Equity Fund		-		(11,207,118	)		(17,114	)		18,990,168
Emerging Growth Fund		-		(7,453,680	)		(4,337	)		1,250,800

*Includes unrealized appreciation (depreciation) on investments, derivatives and foreign currency denominated assets and liabilities if any.

The following Funds elected to defer to January 1, 2006 post-October losses:

	Amount
Large Cap Value Fund	$	16,825
Equity Index Fund		313,532

The following Funds elected to defer to January 1, 2006 post-October currency losses:

	Amount
Large Cap Value Fund	$	21,985

7.  Proxy Voting
(Unaudited)  A description of the policies and procedures that each Fund's investment adviser and sub-advisers use to vote proxies relating to the Fund's portfolio securities is available, without charge, upon request, by calling 1-888-309-3539, and on the Securities and Exchange Commission's website at http://www.sec.gov.

Information regarding how the Funds voted proxies relating to portfolio securities during the most recent 12-month period ended June 30 is available, without charge, upon request, on the MassMutual website at http://www.massmutual.com and on the Securities and Exchange Commission's website at http://www.sec.gov.

8.  Quarterly
Reporting
(Unaudited)  The Funds file their complete schedule of portfolio holdings with the SEC for the first and third quarters of each fiscal year on Form N-Q. The Funds' Forms N-Q are available on the SEC website at http://www.sec.gov. The Funds' Forms N-Q may be reviewed and copied at the SEC's Public Reference Room in Washington D.C. Information on the operation of the SEC's Public Reference Room may be obtained by calling 1-800-SEC-0330.

68

Report of Independent Registered Public Accounting Firm

To the Board of Trustees and Shareholders of MML Series Investment Fund

We have audited the accompanying statements of assets and liabilities, including the portfolios of investments, of the MML Series Investment Fund (the "MML Trust"), comprised of the Large Cap Value Fund, the Equity Index Fund, the Growth Equity Fund, the OTC 100 Fund, the Small Cap Growth Equity Fund and the Emerging Growth Fund (collectively the "Funds"), as of December 31, 2005, and the related statements of operations for the year then ended, the statements of changes in net assets for each of the two years in the period then ended, and the financial highlights for each of the five years in the period then ended. These financial statements and financial highlights are the responsibility of the MML Trust's management. Our responsibility is to express an opinion on these financial statements and financial highlights based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements and financial highlights are free of material misstatement. The MML Trust is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. Our audits include consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion of the effectiveness of the MML Trust's internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and sign ificant estimates made by management, as well as evaluating the overall financial statement presentation. Our procedures include confirmation of securities owned as of December 31, 2005, by correspondence with the custodian and brokers; where replies were not received from brokers, we performed other auditing procedures. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, such financial statements and financial highlights present fairly, in all material respects, the financial positions of each of the Funds constituting the MML Trust as of December 31, 2005, and the results of their operations for the year then ended, the changes in their net assets for each of the two years in the period then ended and their financial highlights for each of the five years in the period then ended in conformity with accounting principles generally accepted in the United States of America.

Deloitte & Touche LLP
Boston, Massachusetts
February 22, 2006

69

Trustees and Officers (Unaudited)

The following table lists the Trust's trustees and officers as of December 31, 2005; their address and age; their position with the Trust; the length of time holding that position with the Trust; their principal occupation(s) during the past five years; the number of portfolios in the fund complex they oversee; and other directorships they hold in companies subject to registration or reporting requirements of the Securities Exchange Act of 1934 (generally called "public companies") or in registered investment companies. The Trust's Statement of Additional Information includes additional information about the Trust's trustees and is available, without charge, upon request by calling 1-888-309-3539 or by writing MML Series Investment Fund, c/o Massachusetts Mutual Life Insurance Company, 1295 State Street, Springfield, Massachusetts 01111-0111, Attention: Retirement Services Marketing.

Disinterested Trustees	Name, Address*, and Age	Position(s) Held with Trust	Term of Office** and Length of Time Served	Principal Occupation(s) During Past 5 Years	Number of Portfolios in Fund Complex Overseen by Trustee		Other Directorships Held by Trustee
	Richard W. Greene Age: 70	Chairman and Trustee of the Trust	Since 1999	Retired; Vice President for Investments and Treasurer (1998-2000), University of Rochester (private university).		31	Trustee (since 1996), Advisory Board Member (1996-1999), MassMutual Select Funds (open-end investment company).
	Richard H. Ayers Age: 63	Trustee of the Trust	Since 1999	Retired.		31	Director, Applera Corporation; Trustee (since 1996) MassMutual Select Funds (open-end investment company).
	Allan W. Blair Age: 57	Trustee of the Trust	Since 2003	President and Chief Executive Officer (since 1996), Economic Development Council of Western Massachusetts; President and Chief Executive Officer (since 1993), Westmass Area Development Corporation; President and Chief Executive Officer (since 1984), Westover Metropolitan Development Corporation.		31	Director (since 2001), Future Works, Inc.; Trustee (since 2003), MassMutual Select Funds (open-end investment company).
	Mary E. Boland Age: 66	Trustee of the Trust	Since 1973	Attorney at Law (since 2004); Attorney at Law (1965-2004), Egan, Flanagan and Cohen, P.C. (law firm), Springfield, MA.		31	Director (1995-1999), Trustee (until 1995), SIS Bank (formerly, Springfield Institution for Savings); Director (since 1999), BankNorth Massachusetts; Vice Chairman (since 1999), Massachusetts Educational Financing Authority; Trustee (since 1994), MassMutual Select Funds (open-end investment company).
	R. Alan Hunter, Jr. Age: 59	Trustee of the Trust	Since 2003	Retired.		31	Trustee (since 2003), MassMutual Select Funds (open-end investment company).

70

Trustees and Officers (Unaudited) (Continued)

	Name, Address*, and Age	Position(s) Held with Trust	Term of Office** and Length of Time Served	Principal Occupation(s) During Past 5 Years	Number of Portfolios in Fund Complex Overseen by Trustee		Other Directorships Held by Trustee
	F. William Marshall, Jr. Age: 63	Trustee of the Trust	Since 1996	Consultant (since 1999); Chairman (1999), Family Bank, F.S.B. (formerly SIS Bank).		31	Trustee (since 2000), Board II Oppenheimer Funds; Trustee (since 1996), MassMutual Select Funds (open-end investment company).
Interested Trustees
	Robert E. Joyal Age: 60	Vice Chairman and Trustee of the Trust	Since 2003	Retired; President (2001-2003), Managing Director (2000-2001) and Executive Director (1999-2000), David L. Babson & Company Inc.		33	Trustee (since 2003), President (1999-2003), MassMutual Corporate Investors and MassMutual Participation Investors (closed-end investment companies); Director (since 1996), Antares Capital Corporation (bank loan syndication); Director (since 2003), Pemco Aviation Group, Inc.; Trustee (since 2003), MassMutual Select Funds (open-end investment company).
	Frederick C. Castellani Age: 59	Trustee of the Trust	Since 2001	Executive Vice President (since 2001), Senior Vice President (1996-2001), MassMutual.		31	Trustee and President (since 2001), MassMutual Select Funds (open-end investment company); Vice President (since 2004), MassMutual Premier Funds (open-end investment company); Vice President (since 2005), MML Series Investment Fund II (open-end investment company).

Principal Officers who are Not Trustees	Name, Address*, and Age	Position(s) Held with Trust	Length of Time Served	Principal Occupation(s) During Past 5 Years	Number of Portfolios in Fund Complex Overseen by Officer
	Kristin Bushard Age: 39	Vice President of the Trust	Since 2005	Assistant Vice President (since 2005), Managing Director (2003-2005), MassMutual; Assistant Vice President (2000-2003), Allmerica Asset Management.		61

71

Trustees and Officers (Unaudited) (Continued)

Name, Address*, and Age	Position(s) Held with Trust	Length of Time Served	Principal Occupation(s) During Past 5 Years	Number of Portfolios in Fund Complex Overseen by Officer
Michael A. Chong Age: 48	Vice President and Chief Compliance Officer of the Trust	Since 2004	Vice President, Compliance (since 2004), Vice President and Associate General Counsel (1999-2004), MassMutual.		61
James S. Collins Age: 47	Chief Financial Officer and Treasurer of the Trust	Since 2000	Vice President (since 1999), MassMutual.		61
David W. O'Leary Age: 45	President of the Trust	Since 2001	Senior Vice President (since 2001), MassMutual; Senior Vice President (1999-2001), Vice President (1996-1999), Aetna Financial Services.		14
Ian W. Sheridan Age: 40	Vice President of the Trust	Since 2004	Vice President (since 2003), MassMutual; Vice President of Marketing and Business Development (1999-2003), Automatic Data Processing (ADP).		61

*  The address of each Trustee and Principal Officer is the same as that for the Trust; 1295 State Street, Springfield, Massachusetts 01111.

**  Each Trustee of the Trust serves until the next meeting of shareholders called for the purpose of electing Trustees and until the election and qualification of his successor or until he dies, resigns or is removed. Notwithstanding the foregoing, unless the Trustees determine that is is desirable and in the best interest of the Trust that an exception to the retirement policy of the Trust be made, a Trustee shall retire and cease to serve as a Trustee as of the first board meeting following the date on which the Trustee attains the age of seventy-two years.

Federal Tax Information (Unaudited)

For corporate shareholders, a portion of the ordinary dividends paid during the Fund's year ended December 31, 2005 qualified for the dividends received deduction, as follows:

Large Cap Value Fund	100	%
Equity Index Fund	100	%
Growth Equity Fund	100	%
OTC 100 Fund	100	%

72

Notes to Financial Statements (Unaudited)

Fund Expenses December 31, 2005

Expense Examples	The following information is in regards to expenses for the six month period ended December 31, 2005:
	As a shareholder of the Funds, you incur ongoing costs, including management fees and other Fund expenses. These examples are intended to help you understand your ongoing costs (in dollars) of investing in the Funds and to compare these costs with the ongoing costs of investing in other mutual funds.
	These examples are based on an investment of $1,000 invested for the six month period ended December 31, 2005.
Actual Expenses	The first line of each table on the following pages provides information about actual account values and actual expenses. You may use the information in this line, together with the amount you invested, to estimate the expenses that you paid over the period. Simply divide your account value by $1,000 (for example, an $8,600 account value divided by $1,000 = 8.6), then multiply the result by the number in the first line under the heading entitled "Operating Expenses Incurred" to estimate the expenses you paid on your account during this period.
Hypothetical Example for Comparison Purposes	The second line of each table on the following pages provides information about hypothetical account values and hypothetical expenses based on the Fund's actual expense ratio and an assumed rate of return of 5% per year before expenses, which is not the Fund's actual return. The hypothetical account values and expenses may not be used to estimate the actual ending account balance or expenses you paid for the period. You may use this information to compare the ongoing costs of investing in the Fund and other funds. To do so, compare this 5% hypothetical example with the 5% hypothetical examples that appear in the shareholder reports of the other funds.
	Please note that the expenses shown in the tables are meant to highlight your ongoing costs only. Therefore, the second line of the table is useful in comparing ongoing costs only, and will not help you determine the relative total costs of owning different funds.

73

Notes to Financial Statements (Unaudited) (Continued)

The Funds incur ongoing operating expenses during the normal course of business, such as management fees and other expenses. The following tables, assuming a $1,000 investment in a class of shares, disclose the ending account value and operating expenses incurred for the six months ended December 31, 2005, based on, (1) the Fund's actual return and actual expenses, and (2) a hypothetical annualized 5% return and the Fund's actual expenses:

Large Cap Value Fund

	Beginning Value		Ending Value		Operating Expense Incurred*
1) Actual	$	1,000.00	$	1,080.20	$	4.67
2) Hypothetical		1,000.00		1,020.72		4.53

*  Expenses are calculated using the annualized expense ratio for the six months ended December 31, 2005 of 0.89%, multiplied by the average account value over the period, multiplied by the number of days in the period, divided by the number of days in the year.

Equity Index Fund

Class I

	Beginning Value		Ending Value		Operating Expense Incurred*
1) Actual	$	1,000.00	$	1,055.30	$	2.33
2) Hypothetical		1,000.00		1,022.94		2.29

*  Expenses are calculated using the annualized expense ratio for the six months ended December 31, 2005 of 0.45%, multiplied by the average account value over the period, multiplied by the number of days in the period, divided by the number of days in the year.

Class II

	Beginning Value		Ending Value		Operating Expense Incurred *
1) Actual	$	1,000.00	$	1,055.70	$	1.50
2) Hypothetical		1,000.00		1,023.74		1.48

*  Expenses are calculated using the annualized expense ratio for the six months ended December 31, 2005 of 0.29%, multiplied by the average account value over the period, multiplied by the number of days in the period, divided by the number of days in the year.

Class III

	Beginning Value		Ending Value		Operating Expense Incurred *
1) Actual	$	1,000.00	$	1,056.60	$	0.78
2) Hypothetical		1,000.00		1,024.45		0.77

*  Expenses are calculated using the annualized expense ratio for the six months ended December 31, 2005 of 0.15%, multiplied by the average account value over the period, multiplied by the number of days in the period, divided by the number of days in the year.

74

Notes to Financial Statements (Unaudited) (Continued)

Growth Equity Fund

	Beginning Value		Ending Value		Operating Expense Incurred *
1) Actual	$	1,000.00	$	1,037.10	$	4.67
2) Hypothetical		1,000.00		1,020.62		4.63

*  Expenses are calculated using the annualized expense ratio for the six months ended December 31, 2005 of 0.91%, multiplied by the average account value over the period, multiplied by the number of days in the period, divided by the number of days in the year.

OTC 100 Fund

	Beginning Value		Ending Value		Operating Expense Incurred *
1) Actual	$	1,000.00	$	1,100.50	$	2.96
2) Hypothetical		1,000.00		1,022.38		2.85

*  Expenses are calculated using the annualized expense ratio for the six months ended December 31, 2005 of 0.56%, multiplied by the average account value over the period, multiplied by the number of days in the period, divided by the number of days in the year.

Small Cap Growth Equity Fund

	Beginning Value		Ending Value		Operating Expense Incurred*
1) Actual	$	1,000.00	$	1,106.60	$	6.32
2) Hypothetical		1,000.00		1,019.21		6.06

*  Expenses are calculated using the annualized expense ratio for the six months ended December 31, 2005 of 1.19%, multiplied by the average account value over the period, multiplied by the number of days in the period, divided by the number of days in the year.

Emerging Growth Fund

	Beginning Value		Ending Value		Operating Expense Incurred *
1) Actual	$	1,000.00	$	1,064.20	$	6.04
2) Hypothetical		1,000.00		1,019.36		5.90

*  Expenses are calculated using the annualized expense ratio for the six months ended December 31, 2005 of 1.16%, multiplied by the average account value over the period, multiplied by the number of days in the period, divided by the number of days in the year.

75

[This page is intentionally left blank.]

[This page is intentionally left blank.]

© 2006 Massachusetts Mutual Life Insurance Company. All rights reserved.

MassMutual Financial Group is a marketing designation (or fleet name) for
Massachusetts Mutual Life Insurance Company (MassMutual) and its affiliates.

L4540 306

MML Series Investment Fund

Annual Report
for the year ended
December 31, 2005

MML Equity Index Fund

INVEST

INSURE

RETIRE

Table of Contents

Letter to Shareholders	1
Portfolio Manager Report	3
Portfolio of Investments	6
Statement of Assets and Liabilities	12
Statement of Operations	13
Statement of Changes in Net Assets	14
Financial Highlights	15
Notes to Financial Statements	17
Report of Independent Registered Public Accounting Firm	24
Trustees and Officers (Unaudited)	25
Federal Tax Information (Unaudited)	27
Other Information (Unaudited)	28

This material must be preceded or accompanied by a current prospectus for the MML Series Investment Fund. Investors should consider a Fund's investment objective, risks and charges and expenses carefully before investing. This and other information about the investment company is available in the prospectus. Read it carefully before investing.

To Our Shareholders

David O'Leary

The new year provides investors with an excellent opportunity to take their financial pulse by checking in with their financial representative. For 2006, there are mixed signals on the investment horizon. MassMutual, however, stands by its conviction that most investors are best served by attention to proper asset allocation and an investment strategy that concentrates on the long term.

MML Series Investment Fund – Letter to Shareholders

2005: A stormy year in many respects

Weather-related stories dominated the headlines for the 12 months ended December 31, 2005 – beginning with the fallout from the late 2004 Indian Ocean tsunami. Elsewhere, October's devastating Pakistan earthquake and Hurricanes Katrina, Rita and Wilma heightened investors' awareness of the power of nature and the impact of current events on the markets.

On the economic front, the first three months of 2005 saw the broader U.S. stock averages struggle unsuccessfully against the headwinds of widespread expectations for slower economic growth, reduced corporate profits and rising inflation – especially in the form of rising crude oil prices. Foreign stocks substantially outperformed U.S. stocks in this environment, but bond prices struggled.

In the second quarter, U.S. stocks struggled to find direction, as moderately positive news on the economy and corporate earnings was tempered by high crude oil prices, rising short-term interest rates and concerns about slowing economic growth. A strong U.S. dollar hampered foreign stocks. In the bond market, Treasuries outperformed other fixed-income asset classes.

Broad-based U.S. stock indexes advanced in the third quarter, as favorable second quarter earnings boosted the market in July. In the bond market, longer-maturity yields rose in July on better-than-expected economic performance, then backed off as soaring crude oil prices once again raised fears of a slowing economy. The Lehman Brothers® Aggregate Bond Index, a broad measure of the U.S. investment-grade fixed-income markets, closed the quarter with a return of -0.67%.*

Stocks made upward progress in the fourth quarter, boosting many broad-based stock indexes into positive territory for full-year 2005. The U.S. economy grew at a pace of 4.1% in the third quarter, lower than initial estimates, but still pleasantly surprising many observers. For the full year, the Dow Jones Industrial Average^SM (The Dow), a barometer of blue-chip stock activity, returned -0.61%, after losing ground in the final week of December. The technology-focused Nasdaq Composite^® Index gained 1.37% for the 12-month period, trailing the S&P 500^® Index, a measure of U.S. large-cap stock performance, which returned 4.91% in the same period. The clear winner for the year, however, was the MSCI^® EAFE^® Index, a benchmark for foreign stocks that delivered an impressive 13.54% return.*

In the bond market during the fourth quarter, the yield curve continued to flatten – indicating a smaller difference in yields between shorter- and longer-term fixed income investments. This flattening of yields is due in large part to persistent upward pressure on short-term yields by the Federal Reserve's (Fed's) credit-tightening and the relatively flat movement of longer-term yields. For the full year, the Lehman Brothers Aggregate Bond Index advanced 2.43%.*

The Major Stories of 2005

Among the events affecting the financial markets during 2005, the sharp rise in energy prices qualifies as one of the most important. Crude oil prices, which began the year near the $40-per-barrel level, ended December around $60 a barrel, following a brief surge above $70 at the end of August. In pure percentage terms, the advance in natural gas was even greater. Many Americans felt the energy squeeze most acutely in the rising cost of unleaded gasoline – whose average per-gallon price

*  Indexes are unmanaged, do not incur fees or expenses and cannot be purchased directly for investment.

(Continued)

1

MassMutual Funds – Letter to Shareholders (Continued)

increased during the year from around $1.75 to $2.20. Fears that higher energy costs might hamper consumer spending turned out to be unfounded, however. From the Friday after Thanksgiving through December 24, U.S. consumers spent 8.7% more in 2005 than in the previous year.

Rising short-term interest rates were another important trend in 2005. The Fed boosted the federal funds rate in 0.25% increments a total of eight times during the year – for a total of 2.0%. Rising interest rates mean higher costs for various types of consumer and business loans. One area of particular concern is home mortgages, along with home equity loans and lines of credit, which have helped finance a significant portion of consumer spending during the past few years. Many experts are concerned about what will happen to consumer spending if housing prices decelerate significantly. Two news items pointed to concerns about real estate's immediate prospects near the end of December. The Mortgage Bankers Association reported that U.S. mortgage applications fell to more than a three-and-a-half-year low, and the National Association of Realtors reported that inventories of existing homes for sale rose to their highest level in more than 19 years.

Outlook

The beginning of the new year is an ideal time to assess your long-term financial strategy. An annual check-up with your financial representative can help ensure that you have positioned yourself to reach your long-term financial goals.

As we proceed into 2006, key economic indicators are mixed. The positive factors include an economy that continues to grow faster than expected, rebounding consumer confidence, muted inflation and interest rates that are still low by historical standards. Currently, strong corporate balance sheets, forecasts for double-digit earnings growth in 2006 and moderate valuations are also positives. Cautionary factors include the possibility that consumer spending will weaken as home refinancing opportunities dry up, and a market that has slowed its advance somewhat in the third year of this bull market. That said, we believe that most investors are best served by attention to proper asset allocation and an investment strategy that focuses less on the market's short-term movements and more on the long term potential. (As always, past performance is no guarantee of future results.)

The information provided is the opinion of MassMutual as of 1/1/2006 and is subject to change without notice. It is not to be construed as tax, legal or investment advice.

David O'Leary
President

2

MML Equity Index Fund – Portfolio Manager Report

What is the investment objective of the MML Equity Index Fund?   The Fund seeks to provide investment results that correspond to the price and yield performance of publicly traded common stocks in the aggregate as represented by the S&P 500^® Index. The Fund pursues this objective by investing at least 80% of its assets in the equity securities of companies that make up the S&P 500 Index.

How did the Fund perform during the 12 months ended December 31, 2005?   The Fund's Class I shares returned 4.53%, moderately trailing the 4.91% return of the S&P 500 Index, a widely recognized, unmanaged index representative of common stocks of larger capitalized U.S. companies.

What was the investment backdrop during the period?   The first quarter saw the broader U.S. stock averages struggle unsuccessfully to remain above the break-even mark in the midst of widespread expectations for slower growth by the nation's economy and a reduction in corporate profits. On the fixed-income front, bond yields fell and prices rose in January, but fears of rising inflation later in the quarter reversed much of the advance. Additionally, there were two 0.25% hikes in short-term interest rates by the Federal Reserve (Fed) during the first three months of 2005. Turning to the second quarter, U.S. stocks traded indecisively, as moderately positive news on the economy and corporate earnings was tempered by high crude oil prices and rising short-term interest rates. In the bond market, Treasuries outperformed other fixed-income asset class es, while investment-grade bonds outpaced high-yield securities in the corporate sector.

The third quarter was dominated by a strong rally in oil prices, compounded by the impact of Hurricanes Katrina and Rita. The Fed raised the federal funds rate twice during the quarter, its main concern being the increasing risk of inflation due to escalating energy costs. The economic environment continued nearly unchanged in the fourth quarter, as oil prices and interest rates continued to dominate the headlines – and the Fed raised interest rates twice more, bringing the total to eight 0.25% increases in 2005. After reaching $70 per barrel at the end of August, light crude oil prices retreated during the fourth quarter and finished the year at $61 per barrel.

What factors contributed to the Fund's performance?   In the first quarter, growth stocks outpaced value issues, and small- and mid-cap securities ended the period in negative territory. On a sector basis, the energy and utilities sectors posted the best performance – but not enough to bring the S&P 500 Index (the Index) into positive territory. The financial sector of the Index lost 6.38% and information technology dropped 7.33%. The worst-performing sector for the period, telecommunications services, returned –7.78%. Against the backdrop of high oil prices and two interest hikes by the Fed, the majority of U.S. equity indexes posted negative returns for the period.

In the second quarter, value stocks outpaced their growth counterparts, and small- and mid-cap securities posted positive returns. From a sector perspective, utilities and financials sectors posted the best performance, up 9.31% and 4.33%, respectively. The health care sector was also positive for the period, posting a return of 4.13%. The increase in the energy sector continued, as that sector advanced 1.99%. The worst-performing group for the second quarter was materials, which fell 9.47%.

Large-capitalization stocks in the third quarter underperformed both mid- and small-cap stocks. During the quarter, energy was the best-performing sector in the Index, returning 18.25%, and telecommunication services, with its loss of 1.05%, was the worst performer. In the final quarter of 2005, large-cap stocks once again underperformed mid-caps. This time, however, large issues outpaced their small-capitalization competition. Energy was the worst-performing sector in the Index, returning -7.36%; materials was the best-performing group, advancing 11.19%.

3

MML Equity Index Fund – Portfolio Manager Report (Continued)

What is your outlook?   Conflicting signals abound as we enter 2006. Positive factors include an economy that continues to grow more than expected, rebounding consumer confidence, muted inflation interest rates that are still low by historical standards – along with currently strong corporate balance sheets, forecasts for double-digit earnings growth in 2006 and moderate valuations. Conversely, cautionary factors include the possibility that consumer spending will weaken as home refinancing opportunities dry up, a historically challenging phase of the four-year presidential cycle and a market that has slowed somewhat in its advance. In such an environment, proper asset allocation and an investment strategy that concentrates on the long term are important areas of focus for investors.

MML Equity Index Fund

Industry Table

(% of Net Assets) on 12/31/05

Energy	9.3	%
Banking, Savings & Loans	9.2	%
Pharmaceuticals	8.5	%
Electrical Equipment & Electronics	6.8	%
Financial Services	6.2	%
Insurance	5.9	%
Retail	5.0	%
Computers & Information	3.8	%
Prepackaged Software	3.4	%
Electric Utilities	3.0	%
Telephone Utilities	3.0	%
Broadcasting, Publishing & Printing	2.4	%
Cosmetics & Personal Care	2.4	%
Medical Supplies	2.4	%
Aerospace & Defense	2.2	%
Beverages	2.1	%
Transportation	1.9	%
Commercial Services	1.6	%
Industrial – Diversified	1.6	%
Foods	1.5	%
Healthcare	1.5	%
Tobacco	1.5	%
Chemicals	1.4	%
Communications	1.1	%
Computers & Office Equipment	1.0	%
Machinery & Components	1.0	%
Entertainment & Leisure	0.9	%
Data Processing & Preparation	0.8	%
Metals & Mining	0.8	%
Apparel, Textiles & Shoes	0.6	%
Automotive & Parts	0.6	%
Household Products	0.6	%
Restaurants	0.6	%
Short-Term Investments and Other Assets and Liabilities	0.6	%
Communications Equipment	0.5	%
Home Construction, Furnishings & Appliances	0.5	%
Real Estate	0.5	%
Computer Integrated Systems Design	0.4	%
Forest Products & Paper	0.4	%
Information Retrieval Services	0.4	%
Manufacturing	0.4	%
Lodging	0.3	%
Advertising	0.2	%
Building Materials & Construction	0.2	%
Containers	0.2	%
Food Retailers	0.2	%
Retail – Grocery	0.2	%
Air Transportation	0.1	%
Industrial – Distribution	0.1	%
Photography Equipment/Supplies	0.1	%
Toys, Games	0.1	%
Computer Programming Services	0.0	%
Travel	0.0	%
	100.0	%

MML Equity Index Fund

Largest Stock Holdings (12/31/05)

General Electric Co.

Exxon Mobil Corp.

Citigroup, Inc.

Microsoft Corp.

The Procter & Gamble Co.

Bank of America Corp.

Johnson & Johnson

American International Group, Inc.

Pfizer, Inc.

Altria Group, Inc.

4

MML Equity Index Fund – Portfolio Manager Report (Continued)

Growth of a $10,000 Investment

Hypothetical Investments in MML Equity Index Fund Class I and the S&P 500 Index.

MML Series Investment Fund

Total Return	One Year 1/1/05 - 12/31/05			Five Year Average Annual 1/1/01 - 12/31/05			Since Inception Average Annual 5/1/97 - 12/31/05
MML Equity Index Fund Class I		4.53	%		0.10	%		6.39	%
S&P 500 Index		4.91	%		0.54	%		6.89	%

Hypothetical Investments in MML Equity Index Fund Class II, Class III and the S&P 500 Index.

MML Series Investment Fund

Total Return	One Year 1/1/05 - 12/31/05			Five Year Average Annual 1/1/01 - 12/31/05			Since Inception Average Annual 5/1/00 - 12/31/05
MML Equity Index Fund Class II		4.65	%		0.27	%		–1.35	%
MML Equity Index Fund Class III		4.80	%		0.34	%		–1.26	%
S&P 500 Index		4.91	%		0.54	%		–1.06	%

GROWTH OF A $10,000 INVESTMENT SINCE INCEPTION

Performance data quoted represents past performance; past performance is not predictive of future results. The investment return and principal value of shares of the Fund will fluctuate with market conditions so that shares of the Fund, when redeemed, may be worth more or less than their original cost. Current performance of the Fund may be lower or higher than the performance quoted. Performance data current to the most recent month end may be obtained by accessing the website at www.massmutual.com.

Investors should note that the Fund is a professionally managed mutual fund, while the S&P 500 Index is unmanaged and does not incur expenses, and cannot be purchased directly by investors. Investors should read the Fund's prospectus with regard to the Fund's investment objective, risks and charges and expenses in conjunction with these financial statements. The Fund's return reflects changes in the net asset value per share without the deduction of any product charges. Total return figures would be lower for the periods presented if they reflected these charges.

5

MML Equity Index Fund – Portfolio of Investments

December 31, 2005

	Number of Shares		Market Value
EQUITIES — 99.4%
COMMON STOCK
Advertising — 0.2%
Interpublic Group of Companies, Inc.(a) (b)		14,607	$	140,958
Monster Worldwide, Inc.(a) (b)		4,076		166,382
Omnicom Group, Inc.		6,506		553,856
				861,196
Aerospace & Defense — 2.2%
Boeing Co.		28,611		2,009,637
General Dynamics Corp.		6,907		787,743
Goodrich Corp.		4,139		170,113
Honeywell International, Inc.		29,290		1,091,052
Lockheed Martin Corp.		12,740		810,646
Northrop Grumman Corp.		12,390		744,763
Raytheon Co.		15,588		625,858
Rockwell Collins, Inc.		6,068		281,980
United Technologies Corp.		36,022		2,013,990
				8,535,782
Air Transportation — 0.1%
Southwest Airlines Co.		24,340		399,906
Apparel, Textiles & Shoes — 0.6%
Coach, Inc.(a)		13,000		433,420
The Gap, Inc.		20,345		358,886
Jones Apparel Group, Inc.		4,196		128,901
Limited Brands		12,130		271,105
Liz Claiborne, Inc.(b)		3,774		135,185
Nike, Inc. Cl. B		6,881		597,202
Nordstrom, Inc.		7,770		290,598
Reebok International Ltd.		2,056		119,721
VF Corp.		3,451		190,978
				2,525,996
Automotive & Parts — 0.6%
AutoNation, Inc.(a)		6,300		136,899
Cooper Tire & Rubber Co.(b)		2,346		35,941
Dana Corp.		5,303		38,076
Ford Motor Co.		63,467		489,965
General Motors Corp.(b)		19,830		385,099
Genuine Parts Co.		6,129		269,186
The Goodyear Tire & Rubber Co.(a) (b)		6,165		107,148
Harley-Davidson, Inc.		9,822		505,735
Navistar International Corp.(a)		2,474		70,806
Paccar, Inc.		6,083		421,126
				2,459,981

	Number of Shares		Market Value
Banking, Savings & Loans — 9.2%
AmSouth Bancorporation		12,559	$	329,171
Bank of America Corp.(b)		139,956		6,458,969
Bank of New York Co., Inc.		27,145		864,568
BB&T Corp.		18,783		787,196
Capital One Financial Corp.		10,000		864,000
Comerica, Inc.		6,069		344,476
Compass Bancshares, Inc.		3,800		183,502
Fannie Mae		33,776		1,648,607
Fifth Third Bancorp(b)		18,922		713,738
First Horizon National Corp.(b)		4,400		169,136
Freddie Mac		24,086		1,574,020
Golden West Financial Corp.		9,010		594,660
JP Morgan Chase & Co.		122,347		4,855,952
KeyCorp		14,310		471,228
M&T Bank Corp.		2,800		305,340
Marshall and Ilsley Corp.(b)		7,300		314,192
Mellon Financial Corp.		14,894		510,119
National City Corp.		19,998		671,333
North Fork Bancorporation, Inc.		16,550		452,808
Northern Trust Corp.		8,488		439,848
Regions Financial Corp.		16,270		555,783
SLM Corp.		14,542		801,119
Sovereign Bancorp, Inc.		12,877		278,401
State Street Corp.		11,722		649,868
SunTrust Banks, Inc.		12,390		901,496
Synovus Financial Corp.		10,963		296,111
U.S. Bancorp		63,532		1,898,971
Wachovia Corp.		54,951		2,904,710
Washington Mutual, Inc.		35,101		1,526,894
Wells Fargo & Co.		58,929		3,702,509
Zions Bancorp		3,193		241,263
				36,309,988
Beverages — 2.1%
Anheuser-Busch Companies, Inc.		26,787		1,150,770
Brown-Forman Corp. Cl. B		3,180		220,438
The Coca-Cola Co.		72,391		2,918,081
Coca-Cola Enterprises, Inc.		11,374		218,040
Constellation Brands, Inc. Cl. A(a)		6,800		178,364

	Number of Shares		Market Value
Molson Coors Brewing Co. Cl. B		1,989	$	133,243
The Pepsi Bottling Group, Inc.		5,038		144,137
PepsiCo, Inc.		58,208		3,438,929
				8,402,002
Broadcasting, Publishing & Printing — 2.4%
Clear Channel Communications, Inc.		18,549		583,366
Comcast Corp. Cl. A(a) (b)		76,718		1,991,599
Dow Jones & Co., Inc.		2,026		71,903
Gannett Co., Inc.		8,570		519,085
Knight Ridder, Inc.(b)		2,655		168,061
The McGraw-Hill Companies, Inc.		13,060		674,288
Meredith Corp.		1,744		91,281
New York Times Co. Cl. A(b)		5,065		133,969
The Scripps (E.W.) Co. Cl. A(b)		3,000		144,060
Time Warner, Inc.		163,508		2,851,580
Tribune Co.		9,509		287,742
Univision Communications, Inc. Cl. A(a)		8,100		238,059
Viacom, Inc. Cl. B		55,629		1,813,505
				9,568,498
Building Materials & Construction — 0.2%
Louisiana-Pacific Corp.(b)		3,856		105,924
Masco Corp.(b)		15,467		466,949
Vulcan Materials Co.(b)		3,510		237,802
				810,675
Chemicals — 1.4%
Air Products & Chemicals, Inc.		7,858		465,115
Dow Chemical Co.		33,768		1,479,714
Du Pont (E.I.) de Nemours & Co.		32,204		1,368,670
Eastman Chemical Co.		2,700		139,293
Engelhard Corp.		4,293		129,434
Hercules, Inc.(a)		4,006		45,268
International Flavors & Fragrances, Inc.		3,246		108,741
Monsanto Co.		9,185		712,113
PPG Industries, Inc.		5,989		346,763
Praxair, Inc.		11,264		596,541
Rohm & Haas Co.		5,040		244,037
				5,635,689

(Continued)

The accompanying notes are an integral part of the financial statements.

6

MML Equity Index Fund – Portfolio of Investments (Continued)

	Number of Shares		Market Value
Commercial Services — 1.6%
Allied Waste Industries, Inc.(a) (b)		7,660	$	66,948
Apollo Group, Inc. Cl. A(a) (b)		5,188		313,666
Block (H&R), Inc.(b)		11,548		283,503
Cendant Corp.		36,442		628,624
Cintas Corp.(b)		4,790		197,252
Convergys Corp.(a)		4,916		77,919
Donnelley (R.R.) & Sons Co.		7,622		260,749
eBay, Inc.(a)		39,823		1,722,345
Ecolab, Inc.		6,416		232,708
Equifax, Inc.		4,659		177,135
Fluor Corp.		2,927		226,140
Moody's Corp.		8,892		546,147
Paychex, Inc.		11,797		449,702
PerkinElmer, Inc.		4,408		103,852
Quest Diagnostics, Inc.		5,828		300,025
Robert Half International, Inc.		5,980		226,582
Ryder System, Inc.(b)		2,182		89,506
Waste Management, Inc.		19,753		599,504
				6,502,307
Communications — 1.1%
ADC Telecommunications, Inc.(a)		3,921		87,603
Andrew Corp.(a)		5,561		59,670
Avaya, Inc.(a)		15,876		169,397
Ciena Corp.(a)		19,241		57,146
Citizens Communications Co.		12,201		149,218
L-3 Communications Holdings, Inc.		3,800		282,530
Lucent Technologies, Inc.(a) (b)		152,879		406,658
Network Appliance, Inc.(a)		12,420		335,340
Qualcomm, Inc.		57,160		2,462,453
Scientific-Atlanta, Inc.		5,310		228,702
Tellabs, Inc.(a)		16,012		174,531
				4,413,248
Communications Equipment — 0.5%
Motorola, Inc.		86,209		1,947,461
Computer Integrated Systems Design — 0.4%
Autodesk, Inc.		8,080		347,036
Computer Sciences Corp.(a)		6,587		333,566
Parametric Technology Corp.(a)		9,034		55,107
Sun Microsystems, Inc.(a)		121,308		508,281
Teradyne, Inc.(a)		6,760		98,493
Unisys Corp.(a)		11,615		67,715
				1,410,198

	Number of Shares		Market Value
Computer Programming Services — 0.0%
Mercury Interactive Corp.(a)		3,070	$	85,315
Computers & Information — 3.8%
Apple Computer, Inc.(a)		28,852		2,074,170
Cisco Systems, Inc.(a)		214,073		3,664,930
Comverse Technology, Inc.(a)		6,822		181,397
Dell, Inc.(a)		83,847		2,514,572
EMC Corp.(a)		82,932		1,129,534
Gateway, Inc.(a)		12,490		31,350
International Business Machines Corp.		55,565		4,567,443
International Game Technology		12,016		369,852
Jabil Circuit, Inc.(a)		6,278		232,851
Lexmark International, Inc.(a)		4,097		183,669
Solectron Corp.(a)		33,581		122,906
Symbol Technologies, Inc.		8,760		112,303
				15,184,977
Computers & Office Equipment — 1.0%
Electronic Data Systems Corp.		17,771		427,215
Hewlett-Packard Co.		100,215		2,869,155
Pitney Bowes, Inc.		8,002		338,084
Xerox Corp.(a)		33,014		483,655
				4,118,109
Containers — 0.2%
Ball Corp.		3,920		155,702
Bemis Co., Inc.		3,666		102,135
Pactiv Corp.(a) (b)		5,159		113,498
Sealed Air Corp.(a) (b)		2,891		162,387
Temple-Inland, Inc.		3,876		173,839
				707,561
Cosmetics & Personal Care — 2.4%
Alberto-Culver Co.(b)		2,607		119,270
Avon Products, Inc.		16,356		466,964
Colgate-Palmolive Co.		17,977		986,038
Kimberly-Clark Corp.		16,507		984,643
The Procter & Gamble Co.		116,786		6,759,574
				9,316,489
Data Processing & Preparation — 0.8%
Affiliated Computer Services, Inc. Cl. A(a)		4,400		260,392
Automatic Data Processing, Inc.		20,104		922,573
First Data Corp.		26,933		1,158,388
Fiserv, Inc.(a)		6,721		290,818
IMS Health, Inc.		8,024		199,958
NCR Corp.(a)		6,500		220,610
				3,052,739

	Number of Shares		Market Value
Electric Utilities — 3.0%
AES Corp.(a)		22,749	$	360,117
Allegheny Energy, Inc.(a)		5,020		158,883
Ameren Corp.		6,481		332,086
American Electric Power Co.		13,757		510,247
CenterPoint Energy, Inc.(b)		11,063		142,160
Cinergy Corp.		6,563		278,665
CMS Energy Corp.(a) (b)		6,938		100,670
Consolidated Edison, Inc.		8,450		391,488
Constellation Energy Group, Inc.		5,925		341,280
Dominion Resources, Inc.		11,878		916,982
DTE Energy Co.		6,037		260,738
Duke Energy Corp.(b)		32,135		882,106
Edison International		11,430		498,462
Entergy Corp.		7,460		512,129
Exelon Corp.(b)		23,336		1,240,075
FirstEnergy Corp.		11,557		566,177
FPL Group, Inc.		13,772		572,364
NiSource, Inc.		9,346		194,958
PG&E Corp.		11,921		442,508
Pinnacle West Capital Corp.(b)		3,200		132,320
PPL Corp.		13,178		387,433
Progress Energy, Inc.(b)		8,672		380,874
Public Service Enterprise Group, Inc.		8,598		558,612
Southern Co.(b)		25,787		890,425
Teco Energy, Inc.		7,261		124,744
TXU Corp.		16,754		840,883
				12,017,386
Electrical Equipment & Electronics — 6.8%
Advanced Micro Devices, Inc.(a)		14,360		439,416
Altera Corp.(a) (b)		12,920		239,408
American Power Conversion Corp.		6,630		145,860
Analog Devices, Inc.		12,970		465,234
Applied Micro Circuits Corp.(a)		10,300		26,471
Broadcom Corp. Cl. A(a)		10,098		476,121
Emerson Electric Co.		14,557		1,087,408
Freescale Semiconductor, Inc. Cl. B(a)		13,525		340,424
General Electric Co.		369,335		12,945,192
Intel Corp.		212,287		5,298,684
JDS Uniphase Corp.(a)		49,988		117,972
Johnson Controls, Inc.		6,650		484,851
Kla-Tencor Corp.(b)		6,806		335,740
Linear Technology Corp.		10,630		383,424
LSI Logic Corp.(a) (b)		13,428		107,424
Maxim Integrated Products, Inc.		11,260		408,062

(Continued)

The accompanying notes are an integral part of the financial statements.

7

MML Equity Index Fund – Portfolio of Investments (Continued)

	Number of Shares		Market Value
Micron Technology, Inc.(a) (b)		21,217	$	282,398
Molex, Inc.(b)		5,090		132,085
National Semiconductor Corp.		12,396		322,048
Novellus Systems, Inc.(a)		4,850		116,982
Nvidia Corp.(a)		5,800		212,048
PMC-Sierra, Inc.(a)		6,189		47,717
Qlogic Corp.(a)		3,200		104,032
Rockwell Automation, Inc.		6,368		376,731
Sanmina-SCI Corp.(a)		18,052		76,902
Texas Instruments, Inc.		56,926		1,825,617
Xilinx, Inc.(b)		12,111		305,318
				27,103,569
Energy — 9.3%
Amerada Hess Corp.		2,753		349,135
Anadarko Petroleum Corp.		8,322		788,510
Apache Corp.		11,400		781,128
Ashland, Inc.		2,503		144,924
BJ Services Co.		11,200		410,704
Burlington Resources, Inc.		13,300		1,146,460
Chevron Corp.		78,466		4,454,515
ConocoPhillips		48,528		2,823,359
Devon Energy Corp.		15,770		986,256
Dynegy, Inc., Cl A(a) (b)		10,027		48,531
El Paso Corp.(b)		22,246		270,511
EOG Resources, Inc.		8,400		616,308
Exxon Mobil Corp.		216,836		12,179,678
Halliburton Co.(b)		17,365		1,075,935
Kerr-McGee Corp.		3,813		346,449
KeySpan Corp.		5,580		199,150
Kinder Morgan, Inc.		3,390		311,710
Marathon Oil Corp.		12,596		767,978
Murphy Oil Corp.		5,700		307,743
Nabors Industries Ltd.(a)		5,215		395,036
National Oilwell Varco, Inc.(a)		6,200		388,740
Nicor, Inc.(b)		1,489		58,533
Noble Corp.(b)		4,740		334,360
Occidental Petroleum Corp.		13,804		1,102,664
Peoples Energy Corp.(b)		1,257		44,083
Rowan Companies, Inc.		3,721		132,616
Schlumberger Ltd.(b)		20,439		1,985,649
Sempra Energy(b)		8,117		363,966
Sunoco, Inc.(b)		4,786		375,127
Transocean, Inc.(a)		11,527		803,317
Valero Energy Corp.		21,400		1,104,240
Weatherford International Ltd.(a)		11,538		417,676
The Williams Companies, Inc.		19,218		445,281
Xcel Energy, Inc.(b)		14,172		261,615
XTO Energy, Inc.		12,299		540,418
				36,762,305

	Number of Shares		Market Value
Entertainment & Leisure — 0.9%
Brunswick Corp.		3,239	$	131,698
Harrah's Entertainment, Inc.		6,623		472,154
News Corp., Inc. Cl. A		85,700		1,332,635
The Walt Disney Co.		67,031		1,606,733
				3,543,220
Financial Services — 6.2%
American Express Co.		43,108		2,218,338
Ameriprise Financial, Inc.		8,622		353,486
Apartment Investment & Management Co. Cl. A(b)		3,400		128,758
Archstone-Smith Trust		6,800		284,852
Bear Stearns Companies, Inc.		3,958		457,268
CIT Group, Inc.		7,300		377,994
Citigroup, Inc.		176,290		8,555,354
Countrywide Financial Corp.		20,854		712,998
E*TRADE Financial Corp.(a)		12,900		269,094
Federated Investors, Inc. Cl. B		3,000		111,120
Franklin Resources, Inc.		5,228		491,484
The Goldman Sachs Group, Inc.		15,709		2,006,196
Huntington Bancshares, Inc.(b)		8,234		195,558
Janus Capital Group, Inc.		8,150		151,834
Lehman Brothers Holdings, Inc.		9,472		1,214,026
MBNA Corp.		43,521		1,182,030
Merrill Lynch & Co., Inc.		32,169		2,178,806
Morgan Stanley		37,591		2,132,913
PNC Financial Services Group, Inc.		9,949		615,147
Price (T. Rowe) Group, Inc.		4,400		316,932
Public Storage, Inc.		2,900		196,388
The Charles Schwab Corp.		36,561		536,350
				24,686,926
Food Retailers — 0.2%
Starbucks Corp.(a)		26,898		807,209
Foods — 1.5%
Archer-Daniels-Midland Co.		21,661		534,160
Campbell Soup Co.		6,502		193,565
ConAgra Foods, Inc.		17,772		360,416
General Mills, Inc.		12,608		621,827
Heinz (H. J.) Co.		12,122		408,754
The Hershey Co.		6,444		356,031
Kellogg Co.		9,164		396,068
The Kroger Co.(a)		25,518		481,780
McCormick & Co., Inc.		4,700		145,324
Safeway, Inc.(b)		15,460		365,784
Sara Lee Corp.		27,165		513,418
SuperValu, Inc.		4,621		150,090

	Number of Shares		Market Value
Sysco Corp.		22,130	$	687,136
Tyson Foods, Inc. Cl. A(b)		8,700		148,770
Wrigley (Wm.) Jr. Co.		6,334		421,148
				5,784,271
Forest Products & Paper — 0.4%
International Paper Co.(b)		17,189		577,722
MeadWestvaco Corp.		6,301		176,617
Plum Creek Timber Co., Inc.(b)		6,500		234,325
Weyerhaeuser Co.		8,590		569,861
				1,558,525
Healthcare — 1.5%
Caremark Rx, Inc.(a)		15,700		813,103
Coventry Health Care, Inc.(a)		5,385		306,730
Express Scripts, Inc.(a)		5,200		435,760
HCA, Inc.		11,661		588,880
Health Management Associates, Inc. Cl. A		8,500		186,660
Humana, Inc.(a)		5,503		298,978
Laboratory Corp. of America Holdings(a) (b)		4,800		258,480
Manor Care, Inc.		3,032		120,583
Tenet Healthcare Corp.(a)		16,259		124,544
UnitedHealth Group, Inc.		47,680		2,962,835
				6,096,553
Home Construction, Furnishings & Appliances — 0.5%
Centex Corp.(b)		4,346		310,696
D.R. Horton, Inc.		9,400		335,862
KB Home		2,842		206,500
Leggett & Platt, Inc.(b)		6,650		152,684
Lennar Corp. Cl. A		4,700		286,794
Maytag Corp.		2,786		52,433
Pulte Homes, Inc.		7,544		296,932
Whirlpool Corp.(b)		2,309		193,402
				1,835,303
Household Products — 0.6%
Black & Decker Corp.(b)		2,850		247,836
The Clorox Co.		5,270		299,810
Corning, Inc.(a)		52,191		1,026,075
Fortune Brands, Inc.		4,980		388,540
Newell Rubbermaid, Inc.		9,535		226,742
Sherwin-Williams Co.		3,929		178,455
Snap-on, Inc.(b)		2,153		80,867
The Stanley Works		2,505		120,340
				2,568,665
Industrial – Distribution — 0.1%
Grainger (W.W.), Inc.		2,879		204,697
Industrial – Diversified — 1.6%
3M Co.		26,672		2,067,080

(Continued)

The accompanying notes are an integral part of the financial statements.

8

MML Equity Index Fund – Portfolio of Investments (Continued)

	Number of Shares		Market Value
Cooper Industries Ltd. Cl. A		3,214	$	234,622
Danaher Corp.		8,410		469,110
Eaton Corp.		5,294		355,174
Illinois Tool Works, Inc.(b)		7,319		643,999
ITT Industries, Inc.		3,237		332,828
Textron, Inc.		4,732		364,269
Tyco International Ltd.		70,774		2,042,538
				6,509,620
Information Retrieval Services — 0.4%
Yahoo!, Inc.(a)		44,016		1,724,547
Insurance — 5.9%
ACE Ltd.		10,000		534,400
Aetna, Inc.		10,022		945,175
AFLAC, Inc.		17,520		813,278
Allstate Corp.		23,104		1,249,233
Ambac Financial Group, Inc.		3,875		298,608
American International Group, Inc.		90,432		6,170,175
Aon Corp.		11,046		397,104
Chubb Corp.		6,673		651,618
Cigna Corp.		4,640		518,288
Cincinnati Financial Corp.		5,782		258,340
Genworth Financial, Inc. Cl. A		13,100		452,998
The Hartford Financial Services Group, Inc.		10,258		881,060
Jefferson-Pilot Corp.		4,720		268,710
Lincoln National Corp.		6,041		320,354
Loews Corp.		4,758		451,296
Marsh & McLennan Companies, Inc.		18,342		582,542
MBIA, Inc.(b)		4,975		299,296
Metlife, Inc.		26,132		1,280,468
MGIC Investment Corp.(b)		3,489		229,646
Principal Financial Group, Inc.		10,136		480,750
Progressive Corp.(b)		6,848		799,709
Prudential Financial, Inc.		18,100		1,324,739
Safeco Corp.		4,559		257,584
St. Paul Travelers Companies		23,963		1,070,427
Torchmark Corp.		3,726		207,166
UnumProvident Corp.(b)		10,270		233,643
WellPoint, Inc.(a)		23,038		1,838,202
XL Capital Ltd. Cl. A		6,027		406,099
				23,220,908
Lodging — 0.3%
Hilton Hotels Corp.		11,491		277,048
Marriott International, Inc. Cl. A		5,964		399,409

	Number of Shares		Market Value
Starwood Hotels & Resorts Worldwide, Inc.		7,140	$	455,960
				1,132,417
Machinery & Components — 1.0%
Baker Hughes, Inc.		11,598		704,926
Caterpillar, Inc.		23,404		1,352,049
Cummins, Inc.(b)		1,539		138,094
Deere & Co.		8,343		568,242
Dover Corp.		7,235		292,945
Ingersoll-Rand Co. Cl. A		11,966		483,067
Pall Corp.		4,492		120,655
Parker Hannifin Corp.		4,214		277,955
				3,937,933
Manufacturing — 0.4%
American Standard Companies, Inc.		6,300		251,685
Applied Materials, Inc.		57,006		1,022,688
Avery Dennison Corp.(b)		3,828		211,574
Millipore Corp.(a) (b)		1,715		113,259
				1,599,206
Medical Supplies — 2.4%
Agilent Technologies, Inc.(a)		14,283		475,481
Allergan, Inc.		4,707		508,168
Applera Corp.-Applied Biosystems Group		6,738		178,961
Bard (C.R.), Inc.		3,620		238,630
Bausch & Lomb, Inc.		1,892		128,467
Baxter International, Inc.		21,292		801,644
Becton, Dickinson & Co.		8,748		525,580
Biomet, Inc.		8,755		320,170
Boston Scientific Corp.(a)		20,772		508,706
Fisher Scientific International, Inc.(a)		4,100		253,626
Guidant Corp.		11,288		730,898
Medtronic, Inc.		42,181		2,428,360
Patterson Cos, Inc.(a)		4,800		160,320
St. Jude Medical, Inc.(a)		12,944		649,789
Stryker Corp.		10,200		453,186
Tektronix, Inc.		3,120		88,015
Thermo Electron Corp.(a)		5,554		167,342
Waters Corp.(a)		4,200		158,760
Zimmer Holdings, Inc.(a)		8,522		574,724
				9,350,827
Metals & Mining — 0.8%
Alcoa, Inc.		30,088		889,702
Allegheny Technologies, Inc.		3,144		113,436
Freeport-McMoRan Copper & Gold, Inc. Cl. B		6,233		335,335
Newmont Mining Corp.		15,309		817,501
Nucor Corp.		5,528		368,828

	Number of Shares		Market Value
Phelps Dodge Corp.		3,285	$	472,613
United States Steel Corp.		3,954		190,069
				3,187,484
Pharmaceuticals — 8.5%
Abbott Laboratories		54,098		2,133,084
AmerisourceBergen Corp.(b)		7,352		304,373
Amgen, Inc.(a)		43,006		3,391,453
Biogen Idec, Inc.(a)		12,037		545,637
Bristol-Myers Squibb Co.		68,442		1,572,797
Cardinal Health, Inc.		14,869		1,022,244
Chiron Corp.(a)		3,860		171,616
Eli Lilly & Co.(b)		39,595		2,240,681
Forest Laboratories, Inc.(a)		11,780		479,210
Genzyme Corp.(a)		8,900		629,942
Gilead Sciences, Inc.(a)		15,744		828,607
Hospira, Inc.(a)		5,439		232,680
Johnson & Johnson		103,596		6,226,120
King Pharmaceuticals, Inc.(a)		8,867		150,030
McKesson Corp.		10,587		546,183
Medco Health Solutions, Inc.(a)		10,420		581,436
MedImmune, Inc.(a)		8,564		299,911
Merck & Co., Inc.		77,015		2,449,847
Mylan Laboratories, Inc.		7,524		150,179
Pfizer, Inc.		256,741		5,987,200
Schering-Plough Corp.		51,588		1,075,610
Sigma-Aldrich Corp.		2,384		150,883
Watson Pharmaceutical, Inc.(a)		3,970		129,065
Wyeth		46,756		2,154,049
				33,452,837
Photography Equipment/Supplies — 0.1%
Eastman Kodak Co.(b)		9,960		233,064
Prepackaged Software — 3.4%
Adobe Systems, Inc.		20,812		769,212
BMC Software, Inc.(a)		8,065		165,252
Citrix Systems, Inc.(a)		6,092		175,328
Computer Associates International, Inc.		16,423		462,964
Compuware Corp.(a)		13,878		124,486
Electronic Arts, Inc.(a)		10,600		554,486
Intuit, Inc.(a)		6,610		352,313
Microsoft Corp.		320,987		8,393,810
Novell, Inc.(a)		13,976		123,408
Oracle Corp.(a)		132,561		1,618,570
Siebel Systems, Inc.		18,118		191,688
Symantec Corp.(a)		37,889		663,058
				13,594,575
Real Estate — 0.5%
Equity Office Properties Trust		14,160		429,473
Equity Residential REIT(b)		9,900		387,288
ProLogis		8,500		397,120

(Continued)

The accompanying notes are an integral part of the financial statements.

9

MML Equity Index Fund – Portfolio of Investments (Continued)

	Number of Shares		Market Value
Simon Property Group, Inc. REIT		6,400	$	490,432
Vornado Realty Trust		4,100		342,227
				2,046,540
Restaurants — 0.6%
Darden Restaurants, Inc.		4,692		182,425
McDonald's Corp.		43,877		1,479,532
Wendy's International, Inc.		3,975		219,659
Yum! Brands, Inc.		10,198		478,082
				2,359,698
Retail — 5.0%
Amazon.com, Inc.(a) (b)		9,633		454,196
AutoZone, Inc.(a)		1,954		179,280
Bed Bath & Beyond, Inc.(a)		10,450		377,768
Best Buy Co., Inc.		14,495		630,243
Big Lots, Inc.(a) (b)		3,874		46,527
Circuit City Stores, Inc.		5,700		128,763
Costco Wholesale Corp.(b)		16,342		808,439
CVS Corp.		27,606		729,351
Dillards, Inc. Cl. A		3,001		74,485
Dollar General Corp.		11,314		215,758
Family Dollar Stores, Inc.		5,951		147,525
Federated Department Stores, Inc.		9,050		600,287
The Home Depot, Inc.		74,937		3,033,450
J.C. Penney Co., Inc.(b)		8,909		495,340
Kohl's Corp.(a)		11,523		560,018
Lowe's Companies, Inc.(b)		27,182		1,811,952
Office Depot, Inc.(a)		10,765		338,021
OfficeMax, Inc.		2,442		61,929
RadioShack Corp.		4,681		98,441
Sears Holdings Corp.(a) (b)		3,708		428,385
Staples, Inc.		25,759		584,987
Target Corp.		30,568		1,680,323
Tiffany & Co.		4,992		191,144
TJX Companies, Inc.		16,676		387,383
Walgreen Co.		35,304		1,562,555
Wal-Mart Stores, Inc.		87,034		4,073,191
				19,699,741
Retail – Grocery — 0.2%
Albertson's, Inc.(b)		12,747		272,148
Whole Foods Market, Inc.		4,800		371,472
				643,620
Telephone Utilities — 3.0%
Alltel Corp.		13,208		833,425
AT&T, Inc.		137,834		3,375,555
BellSouth Corp.		62,820		1,702,422
CenturyTel, Inc.		4,931		163,512
Qwest Communications International, Inc.(a) (b)		53,558		302,603
Sprint Nextel Corp.		102,859		2,402,786

	Number of Shares		Market Value
Verizon Communications, Inc.		96,876	$	2,917,905
				11,698,208
Tobacco — 1.5%
Altria Group, Inc.		72,354		5,406,291
Reynolds American, Inc.(b)		3,000		285,990
UST, Inc.		6,022		245,878
				5,938,159
Toys, Games — 0.1%
Hasbro, Inc.		6,191		124,934
Mattel, Inc.		14,489		229,216
				354,150
Transportation — 1.9%
Burlington Northern Santa Fe Corp.		12,993		920,164
Carnival Corp.		15,185		811,942
CSX Corp.		7,465		378,998
FedEx Corp.		10,503		1,085,905
Norfolk Southern Corp.		13,689		613,678
Union Pacific Corp.		9,217		742,061
United Parcel Service, Inc. Cl. B		38,500		2,893,275
				7,446,023
Travel — 0.0%
Sabre Holdings Corp.		4,731		114,064
TOTAL EQUITIES (Cost $348,427,246)				393,460,367
	Principal Amount
SHORT-TERM INVESTMENTS — 8.3%
Cash Equivalents — 7.9%(e)
Abbey National PLC Eurodollar Time Deposit 4.290% 01/11/2006	$	658,113		658,113
American Beacon Money Market Fund(c)		282,988		282,988
Bank of America 4.230% 01/20/2006		691,019		691,019
Bank of America 4.270% 01/17/2006		506,387		506,387
Bank of Montreal Eurodollar Time Deposit 4.300% 01/19/2006		1,316,226		1,316,226
Bank of Nova Scotia Eurodollar Time Deposit 4.250% 01/27/2006		658,113		658,113
Barclays 4.313% 01/17/2006		675,724		675,724

	Principal Amount		Market Value
Barclays Eurodollar Time Deposit 4.300% 01/31/2006	$	658,112	$	658,112
Barclays Eurodollar Time Deposit 4.410% 02/27/2006		329,056		329,056
BGI Institutional Money Market Fund(c)		1,052,980		1,052,980
Branch Banker & Trust Eurodollar Time Deposit 4.260% 01/11/2006		329,056		329,056
Calyon Eurodollar Time Deposit 4.335% 02/06/2006		658,112		658,112
Dexia Group Eurodollar Time Deposit 4.230% 01/20/2006		658,112		658,112
Dexia Group Eurodollar Time Deposit 4.265% 01/27/2006		658,112		658,112
Federal Home Loan Bank Discount Note 4.186% 01/25/2006		393,114		393,114
First Tennessee National Corp. Eurodollar Time Deposit 4.290% 01/13/2006		1,316,225		1,316,225
Fortis Bank Eurodollar Time Deposit 4.280% 01/12/2006		658,112		658,112
Fortis Bank Eurodollar Time Deposit 4.300% 01/04/2006		658,112		658,112
Fortis Bank Eurodollar Time Deposit 4.350% 01/03/2006		658,112		658,112
Freddie Mac Discount Note 4.234% 01/30/2006		528,494		528,494
General Electric Capital Corp. 4.274% 01/23/2006		1,308,766		1,308,766
Goldman Sachs Financial Square Prime Obligations Money Market Fund(c)		482,875		482,875
Merrimac Cash Fund, Premium Class(c)		105,298		105,298
Morgan Stanley Dean Witter & Co. 4.330% 01/13/2006		1,316,225		1,316,225
National Australia Bank Eurodollar Time Deposit 4.156% 01/03/2006		2,145,185		2,145,185

(Continued)

The accompanying notes are an integral part of the financial statements.

10

MML Equity Index Fund – Portfolio of Investments (Continued)

	Principal Amount		Market Value
Rabobank Nederland Eurodollar Time Deposit 4.150% 01/03/2006	$	855,546	$	855,546
Rabobank Nederland Eurodollar Time Deposit 4.210% 01/19/2006		1,052,980		1,052,980
Royal Bank of Canada Eurodollar Time Deposit 4.220% 01/20/2006		329,056		329,056
Royal Bank of Canada Eurodollar Time Deposit 4.250% 01/24/2006		658,112		658,112
Royal Bank of Scotland Eurodollar Time Deposit 4.250% 01/23/2006		658,112		658,112
Royal Bank of Scotland Eurodollar Time Deposit 4.300% 01/31/2006		987,168		987,168
Skandinaviska Enskilda Banken AB Eurodollar Time Deposit 4.230% 01/03/2006		329,056		329,056
Skandinaviska Enskilda Banken AB Eurodollar Time Deposit 4.300% 01/17/2006		921,357		921,357
Societe Generale Eurodollar Time Deposit 4.280% 01/30/2006		658,112		658,112
Societe Generale Eurodollar Time Deposit 4.280% 01/31/2006		658,112		658,112
Svenska Handlesbanken Eurodollar Time Deposit 4.100% 01/03/2006		751,050		751,050
The Bank of the West Eurodollar Time Deposit 4.290% 01/25/2006		1,052,980		1,052,980
Toronto Dominion Bank Eurodollar Time Deposit 4.300% 01/23/2006		658,112		658,112
UBS AG Eurodollar Time Deposit 4.255% 01/18/2006		329,056		329,056
UBS AG Eurodollar Time Deposit 4.260% 01/10/2006		658,112		658,112
Wells Fargo Eurodollar Time Deposit 4.270% 01/03/2006		552,814		552,814
Wells Fargo Eurodollar Time Deposit 4.300% 01/18/2006		1,316,225		1,316,225
				31,128,588

	Principal Amount		Market Value
Repurchase Agreement — 0.3%
Investors Bank & Trust Company Repurchase Agreement, dated 12/30/05, 3.02%, due 01/03/2006(f)	$	1,401,383	$	1,401,383
U.S. Treasury Bills — 0.1%
U.S. Treasury Bill(d) 3.938% 04/06/2006		385,000		380,436
TOTAL SHORT-TERM INVESTMENTS (Cost $32,910,929)				32,910,407
TOTAL INVESTMENTS — 107.7% (Cost $381,338,175)(g)				426,370,774
Other Assets/ (Liabilities) — (7.7%)				(30,673,724	)
NET ASSETS — 100.0%			$	395,697,050

Notes to Portfolio of Investments

REIT - Real Estate Investment Trust

(a)  Non-income producing security.

(b)  Denotes all or a portion of security on loan. (Note 2).

(c)  Amount represents shares owned of the fund.

(d)  This security is held as collateral for open futures contracts. (Note 2).

(e)  Represents investments of security lending collateral. (Note 2).

(f)  Maturity value of $1,401,854. Collateralized by U.S. Government Agency obligation with a rate of 7.625%, maturity date of 07/25/2027, and an aggregate market value, including accrued interest, of $1,471,453.

(g)  See Note 6 for aggregate cost for Federal tax purposes.

The accompanying notes are an integral part of the financial statements.

11

MML Equity Index Fund – Financial Statements

Statement of Assets and Liabilities

	December 31, 2005
Assets:
Investments, at value (cost $348,427,246) (Note 2)	$	393,460,367
Short-term investments, at value (cost $32,910,929) (Note 2)		32,910,407
Total Investments (including securities on loan with market values of $29,856,824)		426,370,774
Cash		2,487
Receivables from:
Investments sold		459,488
Affiliated investment adviser (Note 3)		4,389
Fund shares sold		256,828
Interest and dividends		659,368
Total assets		427,753,334
Liabilities:
Payables for:
Investments purchased		499,467
Fund shares repurchased		214,016
Variation margin on open futures contracts (Note 2)		11,287
Securities on loan (Note 2)		31,128,588
Affiliated trustees' fees and expenses (Note 3)		91,565
Affiliates (Note 3):
Investment management fees		33,982
Administration fees		41,636
Accrued expense and other liabilities		35,743
Total liabilities		32,056,284
Net assets	$	395,697,050
Net assets consist of:
Paid-in capital	$	369,697,848
Distributions in excess of net investment income		(57,938	)
Accumulated net realized loss on investments and futures contracts		(18,947,169	)
Net unrealized appreciation on investments and futures contracts		45,004,309
	$	395,697,050
Class I shares:
Net assets	$	76,012,310
Shares outstanding		4,949,687
Net asset value, offering price and redemption price per share	$	15.36
Class II shares:
Net assets	$	182,390,108
Shares outstanding		11,887,978
Net asset value, offering price and redemption price per share	$	15.34
Class III shares:
Net assets	$	137,294,632
Shares outstanding		8,966,163
Net asset value, offering price and redemption price per share	$	15.31

The accompanying notes are an integral part of the financial statements.

12

MML Equity Index Fund – Financial Statements (Continued)

Statement of Operations

	Year ended December 31, 2005
Investment income (Note 2):
Dividends	$	7,222,635
Interest		67,134
Securities lending income		30,133
Total investment income		7,319,902
Expenses (Note 3):
Investment management fees (Note 3)		390,399
Shareholder reporting fees		41,640
Trustee reporting		443
Trustees' fees (Note 3)		163,847
Custody fees		45,973
Audit and legal fees		48,708
Proxy fees		930
		691,940
Administration fees:
Class I		237,395
Class II		335,339
Class III		67,386
Total expenses		1,332,060
Expenses waived (Note 3)		(106,332	)
Class II Administration fees waived (Note 3)		(88,247	)
Class III Administration fees waived (Note 3)		(67,386	)
Net expenses		1,070,095
Net investment income		6,249,807
Realized and unrealized gain (loss):
Net realized gain (loss) on:
Investment transactions		(3,949,975	)
Closed futures contracts		185,072
Net realized loss		(3,764,903	)
Net change in unrealized appreciation (depreciation) on:
Investments		15,041,411
Open futures contracts		(106,836	)
Net unrealized gain		14,934,575
Net realized and unrealized gain		11,169,672
Net increase in net assets resulting from operations	$	17,419,479

The accompanying notes are an integral part of the financial statements.

13

MML Equity Index Fund – Financial Statements (Continued)

Statements of Changes in Net Assets

	Year ended December 31, 2005			Year ended December 31, 2004
Increase (Decrease) in Net Assets:
Operations:
Net investment income	$	6,249,807		$	7,085,355
Net realized loss on investment transactions and futures contracts		(3,764,903	)		(5,329,330	)
Net change in unrealized appreciation (depreciation) on investments and futures contracts		14,934,575			38,239,207
Net increase in net assets resulting from operations		17,419,479			39,995,232
Distributions to shareholders (Note 2):
From net investment income:
Class I		(1,060,658	)		(1,343,883	)
Class II		(2,843,739	)		(3,190,498	)
Class III		(2,331,952	)		(2,549,489	)
Total distributions from net investment income		(6,236,349	)		(7,083,870	)
Tax return of capital:
Class I		(5,900	)		-
Class II		(13,202	)		-
Class III		(10,069	)		-
Total tax return of capital		(29,171	)		-
Net fund share transactions (Note 5):
Class I		(11,332,021	)		1,433
Class II		(6,849,410	)		(19,877,415	)
Class III		(3,611,884	)		(11,810,653	)
Decrease in net assets from net fund share transactions		(21,793,315	)		(31,686,635	)
Total increase (decrease) in net assets		(10,639,356	)		1,224,727
Net assets:
Beginning of year		406,336,406			405,111,679
End of year (including distributions in excess of net investment income of $57,938 and $10,102, respectively)	$	395,697,050		$	406,336,406

The accompanying notes are an integral part of the financial statements.

14

MML Equity Index Fund – Financial Statements (Continued)

Financial Highlights (For a share outstanding throughout each period)

	Class I
	Year ended 12/31/05			Year ended 12/31/04			Year ended 12/31/03			Year ended 12/31/02			Year ended 12/31/01
Net asset value, beginning of year	$	14.90		$	13.71		$	10.83		$	14.14		$	16.27
Income (loss) from investment operations:
Net investment income		0.21	***		0.22	***		0.16	***		0.14	***		0.14	***
Net realized and unrealized gain (loss) on investments		0.47			1.21			2.88			(3.31	)		(2.14	)
Total income (loss) from investment operations		0.68			1.43			3.04			(3.17	)		(2.00	)
Less distributions to shareholders:
From net investment income		(0.22	)		(0.24	)		(0.16	)		(0.14	)		(0.07	)
Tax return of capital		(0.00	)†		-			-			-			-
From net realized gains		-			-			-			-			(0.06	)
Total distributions		(0.22	)		(0.24	)		(0.16	)		(0.14	)		(0.13	)
Net asset value, end of year	$	15.36		$	14.90		$	13.71		$	10.83		$	14.14
Total Return(a)		4.53	%		10.42	%		28.08	%		(22.46	)%		(12.32	)%
Ratios / Supplemental Data:
Net assets, end of year (000's)	$	76,012		$	85,138		$	78,597		$	58,454		$	81,535
Ratio of expenses to average daily net assets:
Before expense waiver		0.48	%		0.44	%		0.44	%		0.44	%		0.45	%
After expense waiver#		0.45	%		N/A			N/A			N/A			N/A
Net investment income to average daily net assets		1.42	%		1.60	%		1.37	%		1.16	%		0.92	%
Portfolio turnover rate		4	%		4	%		5	%		6	%		5	%
	Class II
	Year ended 12/31/05			Year ended 12/31/04			Year ended 12/31/03			Year ended 12/31/02			Year ended 12/31/01
Net asset value, beginning of year	$	14.89		$	13.70		$	10.82		$	14.13		$	16.26
Income (loss) from investment operations:
Net investment income		0.24	***		0.25	***		0.19	***		0.17	***		0.16	***
Net realized and unrealized gain (loss) on investments		0.45			1.20			2.87			(3.32	)		(2.14	)
Total income (loss) from investment operations		0.69			1.45			3.06			(3.15	)		(1.98	)
Less distributions to shareholders:
From net investment income		(0.24	)		(0.26	)		(0.18	)		(0.16	)		(0.09	)
Tax return of capital		(0.00	)†		-			-			-			-
From net realized gains		-			-			-			-			(0.06	)
Total distributions		(0.24	)		(0.26	)		(0.18	)		(0.16	)		(0.15	)
Net asset value, end of year	$	15.34		$	14.89		$	13.70		$	10.82		$	14.13
Total Return(a)		4.65	%		10.60	%		28.31	%		(22.29	)%		(12.18	)%
Ratios / Supplemental Data:
Net assets, end of year (000's)	$	182,390		$	184,271		$	188,869		$	125,942		$	74,636
Ratio of expenses to average daily net assets:
Before expense waiver		0.37	%		0.33	%		0.33	%		0.33	%		0.34	%
After expense waiver#		0.29	%		0.27	%		0.25	%		0.26	%		0.29	%
Net investment income to average daily net assets		1.59	%		1.75	%		1.56	%		1.37	%		1.08	%
Portfolio turnover rate		4	%		4	%		5	%		6	%		5	%

†  Tax return of capital is less than $0.01 per share.

***  Per share amount calculated on the average shares method.

#  Computed after giving effect to an agreement by MassMutual to waive certain fees and expenses of the Fund for the years ended December 31, 2001, 2002, 2003, 2004 and 2005.

(a)  Total Return information shown in the Financial Highlights table does not reflect expenses that apply at the separate account level or to related insurance products. Inclusion of these charges would reduce the total return figures for all periods shown.

The accompanying notes are an integral part of the financial statements.

15

MML Equity Index Fund – Financial Statements (Continued)

Financial Highlights (For a share outstanding throughout each period)

	Class III
	Year ended 12/31/05			Year ended 12/31/04			Year ended 12/31/03			Year ended 12/31/02			Year ended 12/31/01
Net asset value, beginning of year	$	14.86		$	13.67		$	10.80		$	14.10		$	16.27
Income (loss) from investment operations:
Net investment income		0.26	***		0.26	***		0.20	***		0.18	***		0.19	***
Net realized and unrealized gain (loss) on investments		0.46			1.21			2.86			(3.31	)		(2.19	)
Total income (loss) from investment operations		0.72			1.47			3.06			(3.13	)		(2.00	)
Less distributions to shareholders:
From net investment income		(0.27	)		(0.28	)		(0.19	)		(0.17	)		(0.11	)
Tax return of capital		(0.00	)†		-			-			-			-
From net realized gains		-			-			-			-			(0.06	)
Total distributions		(0.27	)		(0.28	)		(0.19	)		(0.17	)		(0.17	)
Net asset value, end of year	$	15.31		$	14.86		$	13.67		$	10.80		$	14.10
Total Return(a)		4.80	%		10.77	%		28.38	%		(22.18	)%		(12.30	)%
Ratios / Supplemental Data:
Net assets, end of year (000's)	$	137,295		$	136,927		$	137,646		$	115,070		$	154,588
Ratio of expenses to average daily net assets:
Before expense waiver		0.23	%		0.19	%		0.19	%		0.19	%		0.20	%
After expense waiver#		0.15	%		0.14	%		0.14	%		0.14	%		0.15	%
Net investment income to average daily net assets		1.72	%		1.88	%		1.67	%		1.46	%		1.32	%
Portfolio turnover rate		4	%		4	%		5	%		6	%		5	%

†  Tax return of capital is less than $0.01 per share.

***  Per share amount calculated on the average shares method.

#  Computed after giving effect to an agreement by MassMutual to waive certain fees and expenses of the Fund for the years ended December 31, 2001, 2002, 2003, 2004 and 2005.

(a)  Total Return information shown in the Financial Highlights table does not reflect expenses that apply at the separate account level or to related insurance products. Inclusion of these charges would reduce the total return figures for all periods shown.

The accompanying notes are an integral part of the financial statements.

16

Notes to Financial Statements

1.  The Fund
  MML Series Investment Fund ("MML Trust") is registered under the Investment Company Act of 1940, as amended (the "1940 Act"), as a no-load, open end, management investment company. The Trust is organized under the laws of the Commonwealth of Massachusetts as a Massachusetts business trust pursuant to an Agreement and Declaration of Trust dated May 14, 1993, as amended. The following is a series of the Trust (referred to as the "Fund"): MML Equity Index Fund ("Equity Index Fund").

The MML Trust was established by Massachusetts Mutual Life Insurance Company ("MassMutual") for the purpose of providing vehicles for the investment of assets of various separate investment accounts established by MassMutual and by life insurance companies which are subsidiaries of MassMutual. Shares of MML Trust are not offered to the general public.

The Fund offers three classes of shares: Class I, Class II and Class III. Each share class invests in the same portfolio of assets. The principal difference among the classes is the level of service and administration fees borne by the classes. Because each class will have different fees and expenses, performance and share prices among the classes will vary. The classes of shares are offered to different types of investors, as outlined in the Fund's Prospectus.

2.  Significant Accounting Policies
  The following is a summary of significant accounting policies followed consistently by the Fund in the preparation of the financial statements in conformity with accounting principles generally accepted in the United States of America ("generally accepted accounting principles"). The preparation of the financial statements in accordance with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts and disclosures in the financial statements. Actual results could differ from those estimates.

Investment Valuation
  Equity securities are valued on the basis of valuations furnished by a pricing service, authorized by the Board of Trustees ("Trustees"), which provides the last reported sale price for securities listed on a national securities exchange or the official closing price on the NASDAQ National Market System, or in the case of over-the-counter securities not so listed, the last reported bid price. Debt securities (other than short-term obligations with a remaining maturity of sixty days or less) are valued on the basis of valuations furnished by a pricing service, authorized by the Trustees, which determines valuations taking into account appropriate factors such as institutional-size trading in similar groups of securities, yield, quality, coupon rate, m aturity, type of issue, trading characteristics and other market data. Short-term securities with a remaining maturity of sixty days or less are valued at either amortized cost or at original cost plus accrued interest, whichever approximates current market value. All other securities and other assets, including futures, options, swaps and debt securities for which the prices supplied by a pricing agent are deemed by the Trustees not to be representative of market values, including restricted securities and securities for which no market quotation is available, are valued at fair value in accordance with procedures approved by and determined in good faith by the Trustees, although the actual calculation may be done by others. Securities are typically valued on the basis of valuations furnished by a primary pricing service or, if no such valuation is available, from a secondary pricing service. However, valuation methods approved by the Trustees which are intended to reflect fair value may be used when pricin g service information is not readily available or when a security's value is believed to have been materially affected by a significant event, such as a natural disaster, an economic event like a bankruptcy filing, or a substantial fluctuation in domestic or foreign markets, that has occurred after the close of the exchange or market on which the security is principally traded (for example, a foreign exchange or market). In such a case, the Fund's value for a security is likely to be different from the last quoted market price or pricing service information. Due to the subjective and variable nature of fair value pricing, it is possible that the value determined for a particular asset may be materially different from the value realized upon such asset's sale.

Portfolio securities traded on more than one national securities exchange are valued at the last price on the business day as of which such value is being determined at the close of the exchange representing the principal market for such securities. All assets and liabilities expressed in foreign currencies are converted into U.S. dollars at the mean between the buying and selling rates of such currencies against

17

Notes to Financial Statements (Continued)

U.S. dollars last quoted by any major bank. If such quotations are not available, the rate of exchange is determined in accordance with policies established by the Trustees.

Securities Lending
  The Fund may lend its securities to qualified brokers; however, securities lending cannot exceed 33% of the total assets of the Fund taken at current value. The loans are collateralized at all times with cash or securities with a market value at least equal to 100% of the market value of the securities on loan. The market value of the loaned securities is determined at the close of business of the Fund and any additional collateral is delivered to the Fund the next business day. As with other extensions of credit, the Fund may bear the risk of delay in recovery or even loss of rights in the collateral should the borrower of the securities fail financially. The Fund receives compensation for lending its securities. At December 31, 2005, the Fund loaned securities having a market value of $29,856,824, collateralized by cash, which was invested in short-term instruments with a market value of $31,128,588.

The amount of securities on loan indicated in the table above may not correspond with the securities on loan identified on the Portfolio of Investments because securities with pending sales are in process of recall from the brokers. At December 31, 2005, the Fund had securities on loan with pending sales in the amount of $29,471.

The Fund receives, as fees, a share of the income earned on investment of the cash collateral received for the loan of securities. For the year ended December 31, 2005, the Fund earned securities lending income in the following amount:

Securities Lending Gross Income		Securities Lending Fees and Expenses			Securities Lending Net Income
$	1,046,123	$	(1,015,990	)	$	30,133

Repurchase Agreements
  The Fund may enter into repurchase agreements with certain banks and broker/dealers whereby the Fund acquires a security for cash and obtains a simultaneous commitment from the seller to repurchase the security at an agreed upon price and date. The Fund, through its custodian, takes possession of the securities collateralizing the repurchase agreement. The collateral is marked to market daily to ensure that the market value of the underlying assets remains sufficient to protect the Fund in the event of default by the seller. Collateral for certain tri-party repurchase agreements is held at the counterparty's custodian in a segregated account for the benefit of the Fund and the counterparty. In connection with transactions in repurchase agreements, i f the seller defaults and the value of the collateral declines or if the seller enters insolvency proceedings, realization of collateral by the Fund may be delayed or limited.

Accounting for Investments
  Investment transactions are accounted for on the trade date. Realized gains and losses on sales of investments and unrealized appreciation and depreciation of investments are computed on the specific identification cost method. Interest income, adjusted for amortization of discounts and premiums on debt securities, is earned from the settlement date and is recorded on the accrual basis. Dividend income is recorded on the ex-dividend date.

Federal Income Tax
  It is the Fund's intent to continue to comply with the provisions of subchapter M of the Internal Revenue Code of 1986, as amended (the "Code"), applicable to a regulated investment company. Under such provisions, the Fund will not be subject to federal income taxes on its ordinary income and net realized capital gains to the extent they are distributed or deemed to have been distributed to its shareholders. Therefore, no Federal income tax provision is required.

Dividends and Distributions to Shareholders
  Dividends from net investment income and distributions of any net realized capital gains of the Fund are declared and paid annually and at other times as may be required to satisfy tax or regulatory requirements. Distributions to shareholders are recorded on the ex-dividend date. Income and capital gain distributions are determined in accordance with income tax regulations, which may differ from generally accepted accounting principles. These differences are primarily due to investments in passive

18

Notes to Financial Statements (Continued)

foreign investment companies and the deferral of wash sale losses. As a result, net investment income and net realized gain on investment transactions for a reporting period may differ significantly from distributions during such period.

Accordingly, the Fund may periodically make reclassifications among certain of their capital accounts without impacting the net asset value of the Fund.

During the year ended December 31, 2005, the following amounts were reclassified due to differences between book and tax accounting.

Paid-in Capital			Accumulated Net Realized Gain (Loss) on Investments		Undistributed Net Investment Income
$	(70,186	)	$	102,309	$	(32,123	)

Foreign Currency Translation
  The books and records of the Fund are maintained in U.S. dollars. The market values of foreign currencies, foreign securities and other assets and liabilities denominated in foreign currencies are translated into U.S. dollars at the mean of the buying and selling rates of such currencies against the U.S. dollar at the end of each business day. Purchases and sales of foreign securities and income and expense items are translated at the rates of exchange prevailing on the respective dates of such transactions. The Fund does not isolate that portion of the results of operations arising from changes in the exchange rates from that portion arising from changes in the market prices of securities. Net realized foreign currency gains and losses resul ting from changes in exchange rates include foreign currency gains and losses between trade date and settlement date on investment securities transactions, foreign currency transactions and the difference between the amounts of dividends recorded on the books of the Fund and the amount actually received.

Forward Foreign Currency Contracts
  The Fund may enter into forward foreign currency contracts in order to hedge the effect of currency movements of foreign denominated securities or obligations. A forward foreign currency contract is an agreement between two parties to buy and sell a currency at a set price on a future date. The market value of a forward foreign currency contract fluctuates with changes in foreign currency exchange and interest rates. Forward foreign currency contracts are marked to market daily and the change in their value is recorded by the Fund as an unrealized gain or loss. When a forward foreign currency contract is extinguished, through delivery or offset by enteri ng into another forward foreign currency contract, the Fund records a realized gain or loss equal to the difference between the value of the contract at the time it was opened and the value of the contract at the time it was extinguished or offset.

Forward foreign currency contracts involve a risk of loss from the potential inability of counterparties to meet the terms of their contracts and from unanticipated movements in foreign currency values and interest rates.

The notional or contractual amounts of these instruments represent the investments the Fund has in particular classes of financial instruments and does not necessarily represent the amounts potentially subject to risk. The measurement of the risk associated with these instruments is meaningful only when all related and offsetting transactions are considered.

At December 31, 2005, the Fund had no open forward foreign currency contracts.

19

Notes to Financial Statements (Continued)

Delayed Delivery Transactions, When Issued Securities, and Forward Commitments  The Fund may purchase or sell securities on a "when issued" or delayed delivery or on a forward commitment basis. The Fund uses forward commitments to manage interest rate exposure or as a temporary substitute for purchasing or selling particular debt securities. Payment and delivery may take place after the customary settlement period for that security. The price of the underlying securities and the date when the securities will be delivered and paid for are fixed at the time the transaction is negotiated. These securities are valued on the basis of valuations furnished by a pricing service, authorized by the Trustees, which determines valuations taking into account appropriate factors such a s institutional-size trading in similar groups of securities, yield, quality, coupon rate, maturity, type of issue, trading characteristics and other market data. Securities for which no market quotation is available, are valued at fair value in accordance with procedures approved by and determined in good faith by the Trustees, although the actual calculation may be done by others. The Fund records on a daily basis the unrealized appreciation (depreciation) based upon changes in the value of these securities. When a forward commitment contract is closed, the Fund records a realized gain or loss equal to the difference between the value of the contract at the time it was opened and the value of the contract at the time it was closed. Losses may arise due to changes in the value of the underlying securities or if the counterparty does not perform under the contract, or if the issuer does not issue the securities due to political, economic, or other factors. The Fund monitors exposure to ensure counterparties are creditworthy and concentration of exposure is minimized.

At December 31, 2005, the Fund had no open forward commitments, delayed delivery contracts or when issued securities.

Financial Futures Contracts
  The Fund may purchase or sell financial futures contracts and options on such futures contracts for the purpose of hedging the market risk on existing securities or as a substitute for the purchase of securities. Futures contracts are contracts for delayed delivery of securities at a specific future date and at a specific price or yield. Upon entering into a contract, the Fund deposits and maintains as collateral such initial margin as required by the exchange on which the transaction is effected. Pursuant to the contract, the Fund agrees to receive from or pay to the broker an amount of cash equal to the daily fluctuation in value of the contract. Such receipts or payments are known as variation margin and are recorded by the Fund as unrealiz ed gains or losses. When the contract is closed, the Fund records a realized gain or loss equal to the difference between the value of the contract at the time it was opened and the value at the time it was closed. Futures contracts are valued at the settlement price established each day by the board of trade or exchange on which they are traded.

A summary of open futures contracts for the Fund at December 31, 2005, is as follows:

Number of Contracts	Type	Expiration Date		Notional Contract Value		Net Unrealized Depreciation
MML Equity Index Fund
BUYS 39	S&P 500 Index		03/17/06	$	2,446,860	$	(28,290	)

Allocation of Operating Activity
  In maintaining the records for the Fund, the income and expense accounts are allocated to each class of shares. Investment income, unrealized and realized gains or losses are prorated among the classes of shares based on the relative net assets of each. Expenses are allocated to each class of shares depending on the nature of the expenditures. Administration fees, which are directly attributable to a class of shares, are charged to that class' operations. Expenses of the Fund not directly attributable to the operations of any class of shares are prorated among the classes to which the expense relates based on the relative net assets of each.

20

Notes to Financial Statements (Continued)

Foreign Securities  The Fund may also invest in foreign securities, subject to certain percentage restrictions. Investing in securities of foreign companies and foreign governments involves special risks and considerations not typically associated with investing in securities issued by U.S. companies and the U.S. Government. These risks include revaluation of currencies and future adverse political and economic developments. Moreover, securities of many foreign companies and foreign governments and their markets may be less liquid and their prices more volatile than those of securities of comparable U.S. companies and the U.S. Government.

3.  Management Fees and Other Transactions

Investment Management Fees
  Under an agreement between the Trust and MassMutual on behalf of the Fund, MassMutual is responsible for providing investment management services for the Fund. In return for this service, MassMutual receives an advisory fee quarterly from the Fund at the annual rate of 0.10% of the average daily net asset value of the Fund.

MassMutual has entered into an investment sub-advisory agreement with Northern Trust Investments, N.A. ("Northern Trust") for the Fund. MassMutual pays a sub-advisory fee to Northern Trust based upon the aggregate net assets under management which include (1) the average daily net assets of the Fund, and (2) the average daily net assets of all other funds or accounts of MassMutual or its affiliates for which Northern Trust provides sub-advisory services and which have substantially the same investment objectives, policies and investment strategies.

Administration & Shareholder Service Fees  Under a separate administrative and shareholder services agreement between the Fund and MassMutual, MassMutual provides certain administrative and shareholder services and bears some class specific administrative expenses. In return for these services, MassMutual receives an administrative services fee monthly based upon the average daily net assets of the applicable class of shares of the Fund at the following annual rates: 0.30% on the first $100,000,000, 0.28% on the next $150,000,000 and 0.26% on assets in excess of $250,000,000 of Class I shares of the Fund, 0.19% of the average daily net assets of Class II shares of the Fund, and for Class III shares, an amount not to exceed 0.05% of the average daily net assets of the Class III shares.

Expense Waivers  For each class of the Fund, MassMutual has agreed, at least through April 30, 2006, to bear the expenses of the Fund, to the extent that the aggregate expenses (excluding the Fund's management and administrative fees, interest, taxes, brokerage commissions and extraordinary expenses) incurred during the Fund's fiscal year exceed 0.05% of the average daily net assets of the Fund for such year. MassMutual has also agreed to waive certain administrative and shareholder service fees payable by the Fund on account of Class II or Class III shares.

Other  Certain officers and trustees of the Fund are also officers of MassMutual. The compensation of each trustee who is not an officer of MassMutual is borne by the Fund.

Deferred Compensation  Trustees of the Fund that are not employees of MassMutual or its subsidiaries may elect to defer receipt of their annual fees in accordance with terms of the Non-Qualified Deferred Compensation Plan. Any amounts deferred shall accrue interest at a rate equal to eight percent (8%) per annum.

For the year ended December 31, 2005, no significant amounts have been deferred.

21

Notes to Financial Statements (Continued)

4.  Purchases and Sales of Investments  Cost of purchases and proceeds from sales of investment securities (excluding short-term investments) for the year ended December 31, 2005, were as follows:

	Long-Term U.S. Government Securities		Other Long-Term Securities
Purchases	$	-	$	17,423,834
Sales	$	-	$	39,701,023

5.  Capital Share Transactions
  The Fund is authorized to issue an unlimited number of shares, with no par value in each class of shares. Changes in shares outstanding for the Fund are as follows:

	Year ended December 31, 2005						Year ended December 31, 2004
	Shares			Amount			Shares			Amount
Class I
Sold		268,067		$	4,013,494			1,190,416		$	16,724,615
Issued as reinvestment of dividends		68,899			1,066,558			90,073			1,343,884
Redeemed		(1,099,955	)		(16,412,073	)		(1,299,529	)		(18,067,066	)
Net increase (decrease)		(762,989	)	$	(11,332,021	)		(19,040	)	$	1,433
Class II
Sold		1,309,259		$	19,563,975			1,537,829		$	21,537,619
Issued as reinvestment of dividends		184,796			2,856,941			213,984			3,190,498
Redeemed		(1,980,256	)		(29,270,326	)		(3,163,722	)		(44,605,532	)
Net decrease		(486,201	)	$	(6,849,410	)		(1,411,909	)	$	(19,877,415	)
Class III
Sold		37,261		$	572,832			19,216		$	267,033
Issued as reinvestment of dividends		151,784			2,342,021			171,337			2,549,488
Redeemed		(435,899	)		(6,526,737	)		(1,043,953	)		(14,627,174	)
Net decrease		(246,854	)	$	(3,611,884	)		(853,400	)	$	(11,810,653	)

6.  Federal Income Tax Information
  At December 31, 2005, the cost of securities and the unrealized appreciation (depreciation) in the value of investments owned by the Fund, as computed on a Federal income tax basis, were as follows:

Federal Income Tax Cost		Tax Basis Unrealized Appreciation		Tax Basis Unrealized Depreciation			Net Unrealized Appreciation
$	387,779,169	$	79,364,265	$	(40,772,660	)	$	38,591,605

At December 31, 2005, the Fund had available, for Federal income tax purposes, unused capital losses:

Expiring 2010		Expiring 2011		Expiring 2012		Expiring 2013
$	6,501,477	$	110,945	$	2,351,065	$	3,224,406

Net capital loss carryforwards may be applied against any net realized taxable gains in each succeeding year, or until their respective expiration dates, whichever occurs first.

22

Notes to Financial Statements (Continued)

Certain differences exist from the amounts reflected in the Statement of Changes in Net Assets primarily due to the character of short-term capital gains treated as ordinary income for tax purposes. The tax character of distributions paid during the year ended December 31, 2005 was as follows:

Ordinary Income		Long Term Capital Gain		Short Term Capital Gain		Return of Capital
$	6,236,349	$	-	$	-	$	29,171

The tax character of distributions paid during the year ended December 31, 2004 was as follows:

Ordinary Income		Long Term Capital Gain		Return of Capital
$	7,083,870	$	-	$	-

At December 31, 2005, the components of distributable earnings on a tax basis were as follows:

Undistributed Ordinary Income		Undistributed Long Term Capital Gain/ (Capital Loss Carryover)			Other Temporary Differences			Unrealized Appreciation*
$	-	$	(12,187,893	)	$	(404,510	)	$	38,591,605

*  Includes unrealized appreciation (depreciation) on investments, derivatives and foreign currency denominated assets and liabilities if any.

The Fund elected to defer to January 1, 2006 post-October losses in the amount of $313,532.

7.  Proxy Voting (Unaudited)
  A description of the policies and procedures that the Fund's investment adviser and sub-adviser use to vote proxies relating to the Fund's portfolio securities is available, without charge, upon request, by calling 1-888-309-3539, and on the Securities and Exchange Commission's website at http://www.sec.gov.

Information regarding how the Fund voted proxies relating to portfolio securities during the most recent 12-month period ended June 30 is available, without charge, upon request, on the MassMutual website at http://www.massmutual.com and on the Securities and Exchange Commission's website at http://www.sec.gov.

8.  Quarterly Reporting (Unaudited)
  The Fund files its complete schedule of portfolio holdings with the SEC for the first and third quarters of each fiscal year on Form N-Q. The Fund's Forms N-Q are available on the SEC website at http://www.sec.gov. The Fund's Forms N-Q may be reviewed and copied at the SEC's Public Reference Room in Washington D.C. Information on the operation of the SEC's Public Reference Room may be obtained by calling 1-800-SEC-0330.

23

Report of Independent Registered Public Accounting Firm

To the Board of Trustees and Shareholders of MML Series Investment Fund

We have audited the accompanying statement of assets and liabilities, including the portfolio of investments, of the MML Series Investment Fund ("MML Trust"), comprised of the Equity Index Fund (the "Fund"), as of December 31, 2005, and the related statement of operations for the year then ended, the statements of changes in net assets for each of the two years in the period then ended, and the financial highlights for each of the five years in the period then ended. These financial statements and financial highlights are the responsibility of the MML Trust's management. Our responsibility is to express an opinion on these financial statements and financial highlights based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. The MML Trust is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. Our audits include consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion of the effectiveness of the MML Trust's internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. Our procedures include confirmation of securities owned as of December 31, 2005, by correspondence with the custodian and brokers; where replies were not received from brokers, we performed other auditing procedures. We believe that our audit provides a reasonable basis for our opinion.

In our opinion, such financial statements and financial highlights present fairly, in all material respects, the financial position of the Fund as of December 31, 2005, and the results of its operations for the year then ended, the changes in its net assets for each of the two years in the period then ended and its financial highlights for each of the five years in the period then ended in conformity with accounting principles generally accepted in the United States of America.

Deloitte & Touche LLP
Boston, Massachusetts
February 22, 2006

24

Trustees and Officers (Unaudited)

The following table lists the Trust's trustees and officers as of December 31, 2005; their address and age; their position with the Trust; the length of time holding that position with the Trust; their principal occupation(s) during the past five years; the number of portfolios in the fund complex they oversee; and other directorships they hold in companies subject to registration or reporting requirements of the Securities Exchange Act of 1934 (generally called "public companies") or in registered investment companies. The Trust's Statement of Additional Information includes additional information about the Trust's trustees and is available, without charge, upon request by calling 1-888-309-3539 or by writing MML Series Investment Fund, c/o Massachusetts Mutual Life Insurance Company, 1295 State Street, Springfield, Massachusetts 01111-0111, Attention: Retirement Services Marketing.

Disinterested Trustees	Name, Address*, and Age	Position(s) Held with Trust	Term of Office** and Length of Time Served	Principal Occupation(s) During Past 5 Years	Number of Portfolios in Fund Complex Overseen by Trustee		Other Directorships Held by Trustee
	Richard W. Greene Age: 70	Chairman and Trustee of the Trust	Since 1999	Retired; Vice President for Investments and Treasurer (1998-2000), University of Rochester (private university).		31	Trustee (since 1996), Advisory Board Member (1996-1999), MassMutual Select Funds (open-end investment company).
	Richard H. Ayers Age: 63	Trustee of the Trust	Since 1999	Retired.		31	Director, Applera Corporation; Trustee (since 1996) MassMutual Select Funds (open-end investment company).
	Allan W. Blair Age: 57	Trustee of the Trust	Since 2003	President and Chief Executive Officer (since 1996), Economic Development Council of Western Massachusetts; President and Chief Executive Officer (since 1993), Westmass Area Development Corporation; President and Chief Executive Officer (since 1984), Westover Metropolitan Development Corporation.		31	Director (since 2001), Future Works, Inc.; Trustee (since 2003), MassMutual Select Funds (open-end investment company).
	Mary E. Boland Age: 66	Trustee of the Trust	Since 1973	Attorney at Law (since 2004); Attorney at Law (1965-2004), Egan, Flanagan and Cohen, P.C. (law firm), Springfield, MA.		31	Director (1995-1999), Trustee (until 1995), SIS Bank (formerly, Springfield Institution for Savings); Director (since 1999), BankNorth Massachusetts; Vice Chairman (since 1999), Massachusetts Educational Financing Authority; Trustee (since 1994), MassMutual Select Funds (open-end investment company).

25

Trustees and Officers (Unaudited) (Continued)

	Name, Address*, and Age	Position(s) Held with Trust	Term of Office** and Length of Time Served	Principal Occupation(s) During Past 5 Years	Number of Portfolios in Fund Complex Overseen by Trustee		Other Directorships Held by Trustee
	R. Alan Hunter, Jr. Age: 59	Trustee of the Trust	Since 2003	Retired.		31	Trustee (since 2003), MassMutual Select Funds (open-end investment company).
	F. William Marshall, Jr. Age: 63	Trustee of the Trust	Since 1996	Consultant (since 1999); Chairman (1999), Family Bank, F.S.B. (formerly SIS Bank).		31	Trustee (since 2000), Board II Oppenheimer Funds; Trustee (since 1996), MassMutual Select Funds (open-end investment company).
Interested Trustees
	Robert E. Joyal Age: 60	Vice Chairman and Trustee of the Trust	Since 2003	Retired; President (2001-2003), Managing Director (2000-2001) and Executive Director (1999-2000), David L. Babson & Company Inc.		33	Trustee (since 2003), President (1999-2003), MassMutual Corporate Investors and MassMutual Participation Investors (closed-end investment companies); Director (since 1996), Antares Capital Corporation (bank loan syndication); Director (since 2003), Pemco Aviation Group, Inc.; Trustee (since 2003), MassMutual Select Funds (open-end investment company).
	Frederick C. Castellani Age: 59	Trustee of the Trust	Since 2001	Executive Vice President (since 2001), Senior Vice President (1996-2001), MassMutual.		31	Trustee and President (since 2001), MassMutual Select Funds (open-end investment company); Vice President (since 2004), MassMutual Premier Funds (open-end investment company); Vice President (since 2005), MML Series Investment Fund II (open-end investment company).

26

Trustees and Officers (Unaudited) (Continued)

Principal Officers Who Are Not Trustees	Name, Address*, and Age	Position(s) Held with Trust	Length of Time Served	Principal Occupation(s) During Past 5 Years	Number of Portfolios in Fund Complex Overseen by Officer
	Kristin Bushard Age: 39	Vice President of the Trust	Since 2005	Assistant Vice President (since 2005), Managing Director (2003-2005), MassMutual; Assistant Vice President (2000-2003), Allmerica Asset Management.		61
	Michael A. Chong Age: 48	Vice President and Chief Compliance Officer of the Trust	Since 2004	Vice President, Compliance (since 2004), Vice President and Associate General Counsel (1999-2004), MassMutual.		61
	James S. Collins Age: 47	Chief Financial Officer and Treasurer of the Trust	Since 2000	Vice President (since 1999), MassMutual.		61
	David W. O'Leary Age: 45	President of the Trust	Since 2001	Senior Vice President (since 2001), MassMutual; Senior Vice President (1999-2001), Vice President (1996-1999), Aetna Financial Services.		14
	Ian W. Sheridan Age: 40	Vice President of the Trust	Since 2004	Vice President (since 2003), MassMutual; Vice President of Marketing and Business Development (1999-2003), Automatic Data Processing (ADP).		61

*  The address of each Trustee and Principal Officer is the same as that for the Trust; 1295 State Street, Springfield, Massachusetts 01111.

**  Each Trustee of the Trust serves until the next meeting of shareholders called for the purpose of electing Trustees and until the election and qualification of his successor or until he dies, resigns or is removed. Notwithstanding the foregoing, unless the Trustees determine that is is desirable and in the best interest of the Trust that an exception to the retirement policy of the Trust be made, a Trustee shall retire and cease to serve as a Trustee as of the first board meeting following the date on which the Trustee attains the age of seventy-two years.

Federal Tax Information (Unaudited)

For corporate shareholders, 100% of the ordinary dividends paid during the Fund's year ended December 31, 2005 qualified for the dividends received deduction.

27

Other Information (Unaudited)

Fund Expenses
December 31, 2005

Expense Examples	The following information is in regards to expenses for the six month period ended December 31, 2005: As a shareholder of the Fund, you incur ongoing costs, including management fees and other Fund expenses. These examples are intended to help you understand your ongoing costs (in dollars) of investing in the Fund and to compare these costs with the ongoing costs of investing in other mutual funds. These examples are based on an investment of $1,000 invested for the six month period ended December 31, 2005.
Actual Expenses	The first line of each table on the following pages provides information about actual account values and actual expenses. You may use the information in this line, together with the amount you invested, to estimate the expenses that you paid over the period. Simply divide your account value by $1,000 (for example, an $8,600 account value divided by $1,000 = 8.6), then multiply the result by the number in the first line under the heading entitled "Operating Expenses Incurred" to estimate the expenses you paid on your account during this period.
Hypothetical Example for Comparison Purposes	The second line of each table on the following pages provides information about hypothetical account values and hypothetical expenses based on the Fund's actual expense ratio and an assumed rate of return of 5% per year before expenses, which is not the Fund's actual return. The hypothetical account values and expenses may not be used to estimate the actual ending account balance or expenses you paid for the period. You may use this information to compare the ongoing costs of investing in the Fund and other funds. To do so, compare this 5% hypothetical example with the 5% hypothetical examples that appear in the shareholder reports of the other funds. Please note that the expenses shown in the tables are meant to highlight your ongoing costs only. Therefore, the second line of the table is useful in comparing ongoing costs only, and will not help you determine the relati ve total costs of owning different funds.

28

Other Information (Unaudited) (Continued)

The Fund incurs ongoing operating expenses during the normal course of business, such as management fees and other expenses. The following tables, assuming a $1,000 investment in a class of shares, disclose the ending account value and operating expenses incurred for the six months ended December 31, 2005, based on, (1) the Fund's actual return and actual expenses, and (2) a hypothetical annualized 5% return and the Fund's actual expenses:

Equity Index Fund Class I
	Beginning Value		Ending Value		Operating Expense Incurred*
1) Actual	$	1,000.00	$	1,055.30	$	2.33
2) Hypothetical		1,000.00		1,022.94		2.29

*  Expenses are calculated using the annualized expense ratio for the six months ended December 31, 2005 of 0.45%, multiplied by the average account value over the period, multiplied by the number of days in the period, divided by the number of days in the year.

Class II
	Beginning Value		Ending Value		Operating Expense Incurred*
1) Actual	$	1,000.00	$	1,055.70	$	1.50
2) Hypothetical		1,000.00		1,023.74		1.48

*  Expenses are calculated using the annualized expense ratio for the six months ended December 31, 2005 of 0.29%, multiplied by the average account value over the period, multiplied by the number of days in the period, divided by the number of days in the year.

Class III
	Beginning Value		Ending Value		Operating Expense Incurred*
1) Actual	$	1,000.00	$	1,056.60	$	0.78
2) Hypothetical		1,000.00		1,024.45		0.77

*  Expenses are calculated using the annualized expense ratio for the six months ended December 31, 2005 of 0.15%, multiplied by the average account value over the period, multiplied by the number of days in the period, divided by the number of days in the year.

29

© 2006 Massachusetts Mutual Life Insurance Company. All rights reserved.

MassMutual Financial Group is a marketing designation (or fleet name) for
Massachusetts Mutual Life Insurance Company (MassMutual) and its affiliates.

L4540_a 306

Item 2. Code of Ethics.

As of December 31, 2005, the Registrant adopted a Code of Ethics that applies to the Principal Executive Officer and Principal Financial Officer pursuant to the Sarbanes-Oxley Act of 2002. For the year ended December 31, 2005, there were no amendments to a provision of the Code of Ethics. A copy of its Code of Ethics is filed with this Form N-CSR under Item 12(a)(1).

Item 3. Audit Committee Financial Expert.

The Registrant’s Board of Trustees has determined that Richard H. Ayers and R. Alan Hunter, Jr., both members of the Audit Committee, are audit committee financial experts as defined by the Securities and Exchange Commission (the “SEC”). Mr. Ayers and Mr. Hunter are “independent” as defined by the SEC for purposes of audit committee financial expert determinations.

Item 4. Principal Accountant Fees and Services.

Aggregate fees stated below include amounts paid to Deloitte & Touche on behalf of the MML Money Market Fund, the MML Inflation-Protected Bond Fund, the MML Managed Bond Fund, the MML Blend Fund, the MML Equity Fund, the MML Enhanced Index Core Equity Fund, the MML Small Cap Equity Fund and the MML Small Company Opportunities Fund prior to the close of business on April 29, 2005 when the reorganization of the Funds into the MML Series Investment Fund II was completed.

(a)AUDIT FEES: The aggregate fees paid and accrued by the Registrant for professional services rendered by its independent auditors, Deloitte & Touche LLP, for the audit of the Registrant’s annual financial statements for 2005 and 2004 were $263,800 and $263,800, respectively.

(b)AUDIT RELATED FEES: No such fees were billed to the Registrant by Deloitte & Touche LLP for 2005 and 2004.

(c)TAX FEES: The aggregate fees paid or accrued by the Registrant for professional services rendered by Deloitte & Touche LLP for the review of Form 1120-RIC, Form 8613, excise distribution projections, distribution calculation and reasonable out of pocket expenses for 2005 and 2004 were $54,700 and $37,900, respectively.

(d)ALL OTHER FEES: No such fees were billed to the Registrant by Deloitte & Touche LLP for 2005 and 2004.

(e)(1) AUDIT COMMITTEE PRE-APPOVAL POLICY: All services to be performed for the Registrant by Deloitte & Touche LLP must be pre-approved by the audit committee. All services performed during 2005 and 2004 were pre-approved by the committee.

(2) Not applicable.

(f)Not applicable.

(g)The aggregate non-audit fees billed by Deloitte and Touche LLP for services rendered to the Registrant, and the Registrant’s adviser, for the fiscal years 2005 and 2004 were $381,552 and $445,171, respectively.

(h)Not applicable.

Item 5. Audit Committee of Listed Registrants.

Not applicable to this filing.

Item 6. Schedule of Investments.

Not applicable to this filing.

Item 7. Disclosure of Proxy Voting Policies and Procedures for Closed-End Management Investment Companies.

Not applicable to this filing.

Item 8. Portfolio Managers of Closed-End Management Investment Companies.

Not applicable to this filing.

Item 9. Purchases of Equity Securities by Closed-End Management Investment Company and Affiliated Purchasers.

Not applicable to this filing.

Item 10. Submission of Matters to a Vote of Security Holders.

Not applicable to this filing.

Item 11. Controls and Procedures.

(a) The Registrant’s Principal Executive Officer and Principal Financial Officer concluded that the Registrant’s disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940) were effective as of a date within 90 days prior to the filing date of this report (the “Evaluation Date”), based on their evaluation of the effectiveness of the Registrant’s disclosure controls and procedures as of the Evaluation Date.

(b) There were no changes in the Registrant’s internal control over financial reporting (as defined in Rule 30a-3(d) under the 1940 Act (17 CFR 270.30a-3(d)) that occurred during the Registrant’s most recent fiscal quarter  that has materially affected, or is reasonably likely to materially affect, the Registrant’s internal control over financial reporting.

Item 12. Exhibits.

(a)(1) Code of Ethics (Item 2) is attached.

(a)(2) Certifications of the Principal Executive Officer and Principal Financial Officer of the Registrant as required by Rule 30a-2(a) under the Investment Company Act of 1940 (17 CFR 270.30a-2(a)) are attached hereto as Exhibit 99CERT.

(a)(3) Not applicable to this filing.

(b) Certifications pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 as required by Rule 30a-2(b), under the Investment Company Act of 1940 (17 CFR 270.30a-2(b)), Rule 15d-14(b) under the Securities Exchange Act of 1934 (17 CFR 240.15d-14(b)) and Section 1350 of Chapter 63 of Title 18 of the United States Code (18 U.S.C. 1350) are attached hereto as Exhibit 99.906CERT.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

(Registrant)		MML Series Investment Fund
By (Signature and Title)		/s/ David W. O’Leary
		David W. O’Leary, President and Principal Executive Officer
Date	3/3/06
Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.
By (Signature and Title)		/s/ David W. O’Leary
		David W. O’Leary, President and Principal Executive Officer
Date	3/3/06
By (Signature and Title)		/s/ James S. Collins
		James S. Collins, Treasurer and Principal Financial Officer
Date	3/3/06

EX-99.CODEETH

Exhibit 99.CODEETH

CODE OF ETHICS

FOR PRINCIPAL EXECUTIVE AND SENIOR FINANCIAL OFFICERS

OF

THE MASSMUTUAL SELECT FUNDS
THE MML SERIES INVESTMENT FUND

This Code of Ethics (the “Code”) for Principal Executive and Senior Financial Officers has been adopted by those investment companies identified above for which Massachusetts Mutual Life Insurance Company (“MassMutual”) acts as investment adviser (individually, a “Fund” and collectively, the “Funds”), to effectuate compliance with Section 406 under the Sarbanes-Oxley Act of 2002 and the rules adopted to implement Section 406. The Code applies to each Fund’s principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions (“Covered Officers”). A listing of positions currently within the ambit of Covered Officers for each Fund is attached asExhibit A.(1)

1.Purposes of the Code

This Code sets forth standards and procedures that are reasonably designed to deter wrongdoing and to promote:

•honest and ethical conduct, including the ethical handling of actual or apparent conflicts of interest between personal and professional relationships;

•full, fair, accurate, timely, and understandable disclosure in reports and documents that the Funds file with, or submit to, the Securities and Exchange Commission (“SEC”) and in other public communications made by the Funds;

•compliance with applicable governmental laws, rules and regulations;

•the prompt internal reporting of violations of this Code to an appropriate person identified in the Code; and

•accountability for adherence to this Code.

It is acknowledged that, as a result of the contractual relationship between each Fund and MassMutual, of which the Covered Officers are also officers or employees, and subject to MassMutual’s fiduciary duties to each Fund, the Covered Officers will, in the normal course of their duties, be involved in establishing policies and implementing decisions that may have different effects on MassMutual and the Funds. It is further acknowledged that the participation of the Covered Officers in such activities is inherent in the contractual relationship between each Fund and MassMutual and is consistent with the expectations of each Fund’s Board of Trustees with respect to the performance by the Covered Officers of their duties as officers of the Funds.

In general, the principles that govern honest and ethical conduct, including the avoidance of conflicts of interest between personal and professional relationships, reflect, at the minimum, the following: (1) the duty at all times in performing any responsibilities as a financial officer, controller,

(1) The obligations imposed by this Code on Covered Officers are separate from and in addition to any obligations that may be imposed on such persons as Covered Persons under the Code of Ethics adopted by the Funds dated August 4, 2003, under Rule 17j-1 of the Investment Company Act of 1940, as amended and any other code of conduct applicable to Covered Officers in whatever capacity they serve.  This Code does not incorporate by reference any provisions of the Rule 17j-1 Code of Ethics and accordingly, any violations or waivers granted under the Rule 17j-1 Code of Ethics will not be considered a violation or waiver under this Code.

1

accountant or principal executive officer of a Fund, to place the interests of the Fund ahead of personal interests; (2) the fundamental standard that Covered Officers should not take inappropriate advantage of their positions; (3) the duty to assure that each Fund’s financial statements and reports to shareholders are prepared honestly and accurately in accordance with applicable rules, regulations and accounting standards; and (4) the duty to conduct the Fund’s business and affairs in an honest and ethical manner. Each Covered Officer should be sensitive to situations that may give rise to actual as well as apparent conflicts of interest.

2.Prohibitions

The specific provisions and reporting requirements of this Code are concerned primarily with promoting honest and ethical conduct and avoiding conflicts of interest between personal and professional relationships.

No Covered Officer may use information concerning the business and affairs of a Fund (including the investment intentions of a Fund), or use his or her ability to influence such investment intentions, for personal gain to himself or herself, his or her family or friends or any other person or in a manner detrimental to the interests of a Fund or its shareholders.

No Covered Officer may use his or her personal influence or personal relationships to influence the preparation and issuance of financial reports of a Fund whereby the Covered Officer would benefit personally to the detriment of the Fund and its shareholders.

No Covered Officer shall, in connection with carrying out his or her official duties and responsibilities on behalf of a Fund:

(i)	employ any device, scheme or artifice to defraud a Fund or its shareholders;
(ii)	intentionally cause a Fund to make any untrue statement of a material fact or omit to state a material fact necessary in order to make the statements made, in light of the circumstances under which they are made, not misleading in its official documents, regulatory filings, financial statements or communications to the public;
(iii)	engage in any act, practice, or course of business which operates or would operate as a fraud or deceit upon any Fund or its shareholders;
(iv)	engage in any manipulative practice with respect to any Fund;
(v)	intentionally cause a Fund to fail to comply with applicable laws, rules and regulations, including failure to comply with the requirement of full, fair, accurate, understandable and timely disclosure in reports and documents that a Fund files with, or submits to, the SEC and in other public communications made by the Fund;
(vi)	intentionally mislead or omit to provide material information to the Fund’s independent auditors or to the Board of Trustees or the officers of the Fund or its investment adviser in connection with Fund related matters;
(vii)	fail to notify the Code Administrator (as defined in Section 7 below) promptly if he or she becomes aware of any existing or potential violations of this Code or applicable laws; or
(viii)	retaliate against others for, or otherwise discourage, the reporting of actual or apparent violations of this Code.

3.Reports of Conflicts of Interests

If a Covered Officer becomes aware of an actual or apparent conflict of interest under this Code, he or she must immediately report the matter to the Code’s Administrator. Upon receipt of

2

such report, the Code Administrator will take prompt steps to determine whether an actual conflict of interest exists or appears to exist, and if so, will take steps (if possible) to resolve the conflict or remedy the appearance thereof. If the Code Administrator determines that no actual or apparent conflict exists, the Code Administrator shall meet with the Covered Officer to advise him or her of such finding and of his or her reason for taking no action. In lieu of determining whether a conflict or appearance of conflict exists, the Code Administrator may in his or her discretion refer the matter to the affected Fund’s Board of Trustees or any committee appointed by the Board to deal with such information.

If the Code Administrator is involved or believed to be involved in the conflict of interest or appearance of conflict of interest, the Covered Officer shall report the matter directly to MassMutual’s General Counsel, or his or her designee, who shall take the same action as described above with respect to resolving the matter.

4.Waivers

Any Covered Officer requesting a waiver of any provision of this Code must submit a written request for such waiver to the Code Administrator, setting forth the basis of such request and all necessary facts upon which such request can be evaluated. The Code Administrator shall review such request and make a written determination thereon.

In determining whether to waive any of the provisions of this Code, the Code Administrator shall consider whether the proposed action:

(i)is prohibited by this Code;

(ii)is consistent with honest and ethical conduct; and

(iii)will result in a conflict of interest between the Covered Officer’s personal and professional obligations to a Fund.

In lieu of determining whether to waive any provision of this Code, the Code Administrator may in his or her discretion refer the matter to the affected Fund’s Board of Trustees or any committee appointed by the Board to deal with such information.

5.Reporting Requirements

(a)Each Covered Officer shall, upon becoming subject to this Code, be presented with a copy of this Code by the Code Administrator, and shall affirm in writing to the Code Administrator that he or she has received, read, understands and shall adhere to this Code (See Exhibit B).

(b)At least annually, all Covered Officers shall be provided with a copy of the current Code by the Code Administrator, and shall certify that they have read and understand the Code and recognize that they are subject thereto (See Exhibit B).

(c)At least annually, all Covered Officers shall certify that they have complied with the requirements of this Code and that they have disclosed or reported any violations of this Code to the Code Administrator (See Exhibit C).

(d)The Code Administrator shall submit a quarterly report to the Board of Trustees or any committee appointed by the Board to deal with such information, containing (i) a description of any report of a conflict of interest or apparent conflict and the disposition thereof; (ii) a description of any request for a waiver from this Code and the disposition thereof; (iii) any violation of the Code that has been reported or found and the sanction imposed; and (iv) any other significant information arising in connection with the Code, including any proposed amendments.

(e)Each Covered Officer shall notify the Code Administrator promptly if he or she knows of

3

or has a reasonable belief that any violation of this Code has occurred or is likely to occur. Failure to do so is itself a violation of this Code.

(f)Any changes to or waivers of this Code, including “implicit” waivers as defined in applicable SEC rules, will, to the extent required, be disclosed by the Funds as provided by applicable SEC rules.(2)

6.Sanctions

Any violations of this Code shall be subject to the imposition of such sanctions by MassMutual as may be deemed appropriate under the circumstances to achieve the purpose of this Code and may include, without limitation, a letter of censure, suspension from employment or termination of employment, in the sole discretion of MassMutual, and/or removal as an officer of the Fund, in the sole discretion of the Fund’s Board of Trustees or any committee appointed by the Board to deal with such information.

7.Administration and Construction

(a)The administration of this Code of Ethics shall be the responsibility of the Code Administrator of this Code, acting under the terms of this Code and the oversight of the Board of Trustees of the Fund or any committee appointed by the Board to deal with such information.

(b)The Code Administrator shall be the Compliance Officer of the Funds or his or her designee.

(c)The duties of such Code Administrator will include:

(i)maintaining a current list of the names of all Covered Officers;

(ii)   furnishing all Covered Officers a copy of this Code and initially and periodically      informing them of their duties and obligations thereunder;

(iii)maintaining or supervising the maintenance of all records required by this Code, including records of waivers granted hereunder;

(iv)issuing interpretations of this Code which appear to the Code Administrator to be    consistent with the objectives of this Code and any applicable laws or regulations;

(v)conducting such inspections or investigations as shall reasonably be required to   detect and report any violations of this Code, with his or her recommendations to MassMutual’s General Counsel, or his or her designee, and to the Board of Trustees of the affected Fund(s) or any committee appointed by them to deal with such information; and

(vi)periodically conducting educational training programs as needed to explain and   reinforce the terms of this Code.

(d)In carrying out the duties and responsibilities described under this Code, the Code Administrator may consult with such other persons as the Code Administrator shall deem necessary or desirable, including legal counsel to the Trust, legal counsel to the Trustees who are not “interested persons,” as that term is defined in the Investment Company Act of 1940, as amended (the “Disinterested Trustees”), and legal counsel to the Trust’s

(2) An "implicit waiver" is the failure to take action within a reasonable period of time regarding a material departure from a provision of this Code that has been made known to the Code Administrator, MassMutual’s General Counsel, or his or her designee, or an officer of the Trust. 

4

investment adviser.

8.Required Records

The Code Administrator shall maintain and cause to be maintained in an easily accessible place the following records for the period required by applicable SEC rules (currently six years following the end of the fiscal year of the Fund in which the applicable event or report occurred):

(a)a copy of any Code which has been in effect during the period;

(b)a copy of each certification pursuant to the Code made by a Covered Officer during the period;

(c)a copy of each report made by the Code Administrator pursuant to this Code during the period;

(d)a list of all Covered Officers who are or have been required to make reports pursuant to this Code during the period, plus those person(s) who are or were responsible for reviewing these reports;

(e)a record of any request to waive any requirement of this Code, the decision thereon and the reasons supporting the decision;

(f)a record of any report of any conflict of interest or appearance of a conflict of interest received by the Code Administrator or discovered by the Code Administrator during the period, the decision thereon and the reasons supporting the decision; and

(g)a record of any violation of any such Code and of any action taken as a result of such violation, during the period.

9.Amendments and Modifications

This Code (other than Exhibit A and the names of the Funds identified on the first page that have adopted the Code) may not be amended or modified except by a writing that is approved or ratified by a majority vote of the Board of Trustees and the Disinterested Trustees.

10.Confidentiality.

This Code is for the internal use of the Funds. Reports and records prepared or maintained under this Code are considered confidential and shall be maintained and protected accordingly to the extent permitted by applicable laws, rules and regulations. Except as otherwise required by law or this Code, such matters shall not be disclosed to anyone other than the Trustees and their counsel, Fund counsel, Fund officers, the independent auditors of the Funds, and MassMutual or its counsel, except as such disclosure may be required pursuant to applicable judicial or regulatory process.

5

Exhibit A

Positions Covered by this Code of Ethics

MassMutual Institutional Funds and MML Series Investment Fund

Principal Executive Officer

Chief Financial Officer

Treasurer

Assistant Treasurer

Personnel of MassMutual who by virtue of their jobs perform critical financial and accounting functions for MassMutual on behalf of a Fund, including:

Second Vice President/Fund Operations

6

Exhibit B

INITIAL/ANNUAL CERTIFICATION

By signing below I certify that I have received, read, and understand this Code of Ethics for Principal Executive and Senior Financial Officers of the Funds (the “Code”), and further certify that I shall adhere to this Code.

Signature

(Type or Print) Name and Title

Date

Please return the executed certification to the Code Administrator.

7

Exhibit C

ANNUAL COMPLIANCE/REPORTING CERTIFICATION

By signing below, I certify that I have complied with the requirements of this Code of Ethics for Principal Executive and Senior Financial Officers of the Funds (the “Code”), and have disclosed or reported any violations of this Code to the Code Administrator for the year ended                        .

Signature

(Type or Print) Name and Title

Date

Please return the executed certification to the Code Administrator.

8

EX-99.CERT

EXHIBIT 99.CERT

CERTIFICATION PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002:

I, David W. O’Leary certify that:

1. I have reviewed this report on Form N-CSR of MML Series Investment Fund;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations, changes in net assets, and cash flows (if the financial statements are required to include a statement of cash flows) of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940) and internal control over financial reporting (as defined in Rule 30a-3(d) under the Investment Company Act of 1940) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of a date within 90 days prior to the filing date of this report, based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize, and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	3/3/06	/s/ David W. O’Leary
		David W. O’Leary
		President and Principal Executive Officer

CERTIFICATION PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002:

I, James S. Collins, certify that:

1. I have reviewed this report on Form N-CSR of MML Series Investment Fund;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations, changes in net assets, and cash flows (if the financial statements are required to include a statement of cash flows) of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940) and internal control over financial reporting (as defined in Rule 30a-3(d) under the Investment Company Act of 1940) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of a date within 90 days prior to the filing date of this report, based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize, and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	3/3/06	/s/ James S. Collins
		James S. Collins
		Treasurer and Principal Financial Officer

EX-99.906CERT

EXHIBIT 99.906.CERT

CERTIFICATION PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Certified Shareholder Report of the MML Series Investment Fund (the “Trust”) on Form N-CSR for the period ending December 31, 2005, as filed with the Securities and Exchange Commission on the date hereof (“the Report”), the undersigned hereby certifies that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Trust.

Date:	3/3/06	/s/ David W. O’Leary
		David W. O’Leary
		President and Principal Executive Officer

This certification is being furnished to the Commission solely pursuant to Rule 30a-2(b) under the Investment Company Act of 1940, as amended, and 18 U.S.C. § 1350 and is not being filed as part of the Form N-CSR with the Commission.

CERTIFICATION PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Certified Shareholder Report of the MML Series Investment Fund (the “Trust”) on Form N-CSR for the period ending December 31, 2005, as filed with the Securities and Exchange Commission on the date hereof (“the Report”), the undersigned hereby certifies that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Trust.

Date:	3/3/06	/s/ James S. Collins
		James S. Collins
		Treasurer and Principal Financial Officer

This certification is being furnished to the Commission solely pursuant to Rule 30a-2(b) under the Investment Company Act of 1940, as amended, and 18 U.S.C. § 1350 and is not being filed as part of the Form N-CSR with the Commission.