T. Rowe Price Total Equity Market Index Fund

N-CSR 1 artmx.htm T. ROWE PRICE TOTAL EQUITY MARKET INDEX FUND T. Rowe Price Total Equity Market Index Fund - December 31, 2005

Item 1: Report to Shareholders

Total Equity Market Index Fund

December 31, 2005

The views and opinions in this report were current as of December 31, 2005. They are not guarantees of performance or investment results and should not be taken as investment advice. Investment decisions reflect a variety of factors, and the managers reserve the right to change their views about individual stocks, sectors, and the markets at any time. As a result, the views expressed should not be relied upon as a forecast of the fund’s future investment intent. The report is certified under the Sarbanes-Oxley Act of 2002, which requires mutual funds and other public companies to affirm that, to the best of their knowledge, the information in their financial reports is fairly and accurately stated in all material respects.

Fellow Shareholders

U.S. stocks completed their third consecutive year of gains in 2005, as good performance in the second half of the year lifted equities out of their first-half doldrums. Mid-cap stocks performed best. Despite soaring energy prices, rising borrowing costs, and widespread damage along the Gulf Coast stemming from several hurricanes, most major indexes finished near their highest levels of the year—supported by firm economic and corporate earnings growth and merger activity—amid hopes that the Federal Reserve would soon stop raising short-term interest rates.

MARKET ENVIRONMENT

Conditions in the U.S. economy were favorable over the last six months. Economic growth as measured by gross domestic product (GDP) was probably about 3%, job growth was steady, and unemployment hovered around 5%. Fears of higher inflation and slower economic growth, however, picked up in the third quarter. Oil prices spiked in late August to $70 per barrel as Hurricane Katrina severely disrupted energy production along the Gulf Coast but settled around $60 by the end of December. In addition, consumer sentiment soured as gasoline temporarily surged above $3 per gallon and higher oil and natural gas prices presaged a significant jump in heating costs this winter. A sharp fourth-quarter decline in energy costs helped lift consumer sentiment and tempered fears of a significant acceleration of inflation.

Federal Reserve officials acknowledged the economic uncertainty stemming from hurricane damage and elevated energy costs, but concluded that the effects on the economy would be temporary and persisted in raising short-term interest rates at a gradual pace. In the last six months, the central bank lifted the federal funds target rate from 3.25% to 4.25%, a level not seen in more than four years. However, there have been signs in recent months that the Fed may be nearing the end of its rate-tightening program, which began 18 months ago when the fed funds rate was 1.00%. The strongest evidence comes from the Fed’s most recent monetary policy meeting on December 13, 2005. According to the minutes and the post-meeting statement, central bank officials no longer characterize monetary policy as being "accommodative," and they believe that the number of additional interest rate increases "probably would not be large."

Large-cap shares, as measured by the S&P 500 Stock Index, returned 5.77% and 4.91% in the 6- and 12-month periods ended December 31, 2005, versus 7.92% and 10.28% for the Dow Jones Wilshire 4500 Completion Index, a broad benchmark for small- and mid-cap stocks. As measured by various Russell indexes, value stocks generally outperformed growth across all market capitalizations for the full year, but the relative performance of growth stocks improved notably in the second half of the year.

The market for initial public offerings (IPOs) in the second half of the year was comparable to that of the first half. In aggregate, more than 200 companies went public in 2005, according to data from Dealogic and Thomson Financial. Despite strong merger and acquisition activity, particularly from private equity firms, the universe of publicly traded companies based in the U.S., as measured by the Dow Jones Wilshire 5000 Composite Index, expanded in the last six months for the first time in quite some time. As of December 31, there were 4,990 companies in the index versus 4,905 six months ago and 4,971 at the end of 2004.

FUND MERGER NEWS AND SUMMARY OF INVESTMENT STRATEGIES

On July 11, 2005, the T. Rowe Price Equity Index 500 Fund acquired substantially all of the assets of the TD Waterhouse Equity Index 500 Fund and the TD Waterhouse Dow 30 Fund. At the same time, the T. Rowe Price Extended Equity Market Index Fund acquired substantially all of the assets of the TD Waterhouse Extended Market Index Fund. These acquisitions were accomplished by tax-free exchanges. We would like to welcome our new shareholders and thank our longer-term shareholders for their continuing confidence in our investment management abilities. In addition, we believe this is an appropriate time to summarize our funds’ investment strategies for all shareholders.

T. Rowe Price’s Equity Market Index Funds are designed for investors who want to harness the potential for long-term capital appreciation from broad exposure to large-cap stocks (Equity Index 500 Fund), small- and mid-cap stocks (Extended Equity Market Index Fund), or the entire U.S. stock market (Total Equity Market Index Fund). These funds could serve as core holdings in an investor’s portfolio, as they offer many attributes that most investors will find appealing.

• They are well-diversified, which can reduce the potentially negative impact of a given stock on the entire portfolio. The Equity Index 500 Fund invests in all of the S&P 500 Index stocks, while the Total Equity Market Index Fund and the Extended Equity Market Index Fund invested in approximately 1,900 and 2,500 stocks, respectively, as of December 31.

• They tend to closely track their benchmarks. The Equity Index 500 Fund uses a full replication strategy so that the weightings of our holdings match those of the S&P 500 Index. The Total Equity Market Index Fund and the Extended Equity Market Index Fund use a sampling strategy to approximate the sector allocations, price/earnings ratio, and other attributes of their benchmarks. We occasionally invest in securities such as futures and exchange-traded funds (ETFs) so that the index funds can accommodate cash flows and remain fully invested.

• They offer instant, broad exposure to different sectors of the stock market, and each fund’s sector allocations are consistent with its benchmark’s sector breakdown. As such, changes in their sector diversification and other overall characteristics reflect changes in the composition of the indexes, rather than strategic shifts that are typical of an actively managed fund.

• Their expenses are generally very low, which enables investors to retain more of their returns. In general, T. Rowe Price’s equity index funds’ expense ratios are well below those of their peer group averages, as measured by Lipper.

EQUITY INDEX 500 FUND

Your fund returned 5.63% in the last six months and 4.62% for the 12-month period ended December 31, 2005, respectively. As shown in the table, the fund closely tracked the performance of its benchmark, the S&P 500 Stock Index, in both periods. Fund performance tends to slightly trail that of the benchmark due to annual operating and management expenses.

As measured by various S&P 500 sectors, materials stocks did best in percentage terms in the last six months. Shares of metals and mining companies were boosted by the surging price of gold, which climbed to well above $500 per ounce and approached 25-year highs. Energy stocks also continued their impressive run, though the sector backpedaled somewhat in the fourth quarter as oil and gasoline prices fell from peak levels.

The financials sector performed well and, because it is the largest sector in the S&P 500, contributed the most to index and fund performance. Insurance companies benefited from the belief that the industry’s pricing power would be stronger in the wake of last year’s tragic hurricane season. Companies tied to the capital markets also did very well, while real estate and mortgage finance companies lagged as the housing market started to cool.

Information technology stocks, the second-largest S&P 500 sector, also contributed substantially to fund performance. All major underlying industries posted gains, but makers of computers and peripherals fared best, lifted by shares of Apple Computer, which soared along with the popularity of its iPod devices. (Please refer to the fund’s portfolio of investments for a complete listing of the fund’s holdings and the amount each represents in the portfolio.)

For the 12-month period, many S&P 500 sectors produced modest gains, but energy stocks far surpassed other segments. Utilities also performed well, as investors sought securities with attractive dividend yields in an environment of relatively low interest rates. On the downside, consumer discretionary stocks sank amid concerns that elevated energy costs would sap consumer spending. Telecommunication services shares also declined amid weak fundamentals and heightened competition.

Standard & Poor’s authorized a total of 20 changes to the composition of the S&P 500 Index in 2005, 17 of which occurred in the second half of the year. Many of the stocks that left the index were acquired, though a few, such as Delta Air Lines, were dropped after they filed for bankruptcy. Please see the table on page 14 for a complete list of index changes in 2005.

TOTAL EQUITY MARKET INDEX FUND

Your fund returned 6.31% and 6.23% in the 6- and 12-month periods ended December 31, 2005, respectively. The fund nosed past the Dow Jones Wilshire 5000 Composite Index in the last six months and narrowly trailed the benchmark for the full year, as shown in the table. The fund typically lags its benchmark by a wider margin due to annual operating and management expenses.

In general, what is true about the performance of the S&P 500 Stock Index is also true about the performance of the Dow Jones Wilshire 5000 Composite Index. The Wilshire 5000 index, which represents the entire U.S. stock market, includes all S&P 500 companies. In fact, the S&P 500 represents 74% of the Wilshire 5000’s total market value. The largest components of the Wilshire index—as with the S&P 500—have the greatest influence on performance. In addition, the percentage weightings of the major sectors are somewhat similar.

In the last six months, the materials and energy sectors performed best in percentage terms, but the information technology and financials sectors—the two largest in the fund and the index—contributed the most to the portfolio’s performance. In contrast, telecommunication services and utility stocks lagged, and consumer discretionary shares were hobbled by weakness among media companies.

For the 12-month period, energy stocks decisively topped the performance charts in percentage terms and as contributors to our performance. Utilities were strong for the full year, and health care stocks also performed well, as weakness among pharmaceutical stocks was overcome by strength among providers and service companies as well as biotechnology shares. Information technology shares contributed significantly to fund performance, thanks primarily to Internet company Google, which gained steadily throughout the year. Consumer discretionary stocks performed the worst. (Please refer to the fund’s portfolio of investments for a complete listing of the fund’s holdings and the amount each represents in the portfolio.)

EXTENDED EQUITY MARKET INDEX FUND

Boosted by strong performance of mid- and small-cap shares, your fund returned 7.68% and 9.95% in the 6- and 12-month periods ended December 31, 2005, respectively. Thanks to our sampling strategy, the fund closely tracked the Dow Jones Wilshire 4500 Completion Index in both periods, as shown in the table. Due to annual operating and management expenses, however, the fund lagged its benchmark’s performance slightly.

In the last six months, the energy sector produced the best returns on a percentage basis, but information technology shares—the largest sector in the Dow Jones Wilshire 4500 Completion Index—contributed the most to our performance, helped by robust performance of Google. Several mid- and small-cap sectors produced very strong returns, as shown in the table, outpacing their larger counterparts. For example, in the telecommunication services sector, smaller wireless companies fared much better than large-cap wireline businesses. Also, biotechnology companies did much better than pharmaceutical giants in the health care space. (Please refer to the fund’s portfolio of investments for a complete listing of the fund’s holdings and the amount each represents in the portfolio.)

For the 12-month period, energy stocks produced superior returns in percentage terms and contributed the most to our performance. Many other sectors produced excellent returns. Financials lagged somewhat, despite strength in insurance companies, due to weakness among interest rate-sensitive commercial banks, thrifts, and mortgage finance companies. Consumer-related stocks performed worst for the year and in the last six months, as surging energy costs tempered consumer spending.

OUTLOOK

The environment for equities going into 2006 looks quite favorable. The U.S. economy is growing at a steady clip, the Federal Reserve is nearly finished raising short-term interest rates, and corporate profit growth remains healthy. Corporate balance sheets are flush with cash, and consumers have generally remained resilient in the face of rising interest rates and higher energy costs. Of course, stocks could stumble if this pleasant picture becomes clouded. For example, interest rates could keep rising, particularly if inflation picks up, and corporate earnings might slow more than is generally expected.

We do not know if the three-year bull market in equities will continue throughout 2006, and even if it does, we will not try to predict which sectors, stocks, or industries will perform best. Our task is to track closely the major equity indexes with the assets that you have entrusted to us. Once again, we would like you to know that we appreciate your confidence in T. Rowe Price, and we thank you for investing with us.

Respectfully submitted,

E. Frederick Bair
Chairman of the Investment Advisory Committee, Equity Index 500 Fund
and Extended Equity Market Index Fund
Cochairman of the Investment Advisory Committee, Total Equity Market
Index Fund

Ken D. Uematsu
Cochairman of the Investment Advisory Committee, Total Equity Market
Index Fund

January 17, 2006

The committee chairmen have day-to-day responsibility for managing the portfolio and work with committee members in developing and executing the fund’s investment program.

RISKS OF INVESTING

As with all stock mutual funds, the funds’ share prices can fall because of weakness in the stock market, a particular industry, or specific holdings. Stock markets can decline for many reasons, including adverse political or economic developments, changes in investor psychology, or heavy institutional selling. The prospects for an industry or company may deteriorate because of a variety of factors, including disappointing earnings or changes in the competitive environment.

GLOSSARY

Dow Jones Wilshire 5000 Composite Index: Tracks the performance of the most active stocks in the broad U.S. market.

Dow Jones Wilshire 4500 Completion Index: Tracks the performance of all stocks in the Dow Jones Wilshire 5000 Composite Index, excluding those in the S&P 500 Stock Index.

Fed funds target rate: An overnight lending rate set by the Federal Reserve and used by banks to meet reserve requirements. Banks also use the fed funds rate as a benchmark for their prime lending rates.

S&P 500 Stock Index: Tracks the stocks of 500 mostly large U.S. companies.

PORTFOLIO HIGHLIGHTS

THE EVOLVING S&P 500 INDEX

GROWTH OF $10,000

This chart shows the value of a hypothetical $10,000 investment in the fund over the past 10 fiscal year periods or since inception (for funds lacking 10-year records). The result is compared with benchmarks, which may include a broad-based market index and a peer group average or index. Market indexes do not include expenses, which are deducted from fund returns as well as mutual fund averages and indexes.

AVERAGE ANNUAL COMPOUND TOTAL RETURN

This table shows how the fund would have performed each year if its actual (or cumulative) returns for the periods shown had been earned at a constant rate.

GROWTH OF $10,000

AVERAGE ANNUAL COMPOUND TOTAL RETURN

This table shows how the fund would have performed each year if its actual (or cumulative) returns for the periods shown had been earned at a constant rate.

GROWTH OF $10,000

AVERAGE ANNUAL COMPOUND TOTAL RETURN

This table shows how the fund would have performed each year if its actual (or cumulative) returns for the periods shown had been earned at a constant rate.

FUND EXPENSE EXAMPLE

As a mutual fund shareholder, you may incur two types of costs: (1) transaction costs such as redemption fees or sales loads and (2) ongoing costs, including management fees, distribution and service (12b-1) fees, and other fund expenses. The following example is 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. The example is based on an investment of $1,000 invested at the beginning of the most recent six-month period and held for the entire period.

Actual Expenses
The first line of the following table (“Actual”) provides information about actual account values and actual expenses. You may use the information in this line, together with your account balance, 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 “Expenses Paid During Period” to estimate the expenses you paid on your account during this period.

Hypothetical Example for Comparison Purposes
The information on the second line of the table (“Hypothetical”) is based on hypothetical account values and expenses derived from the fund’s actual expense ratio and an assumed 5% per year rate of return before expenses (not the fund’s actual return). You may compare the ongoing costs of investing in the fund with other funds by contrasting this 5% hypothetical example and the 5% hypothetical examples that appear in the shareholder reports of the other funds. The hypothetical account values and expenses may not be used to estimate the actual ending account balance or expenses you paid for the period.

Note: T. Rowe Price charges an account maintenance fee that is not included in the accompanying table. The account maintenance fee is charged on a quarterly basis, usually during the last week of a calendar quarter, and applies to accounts with balances below $10,000 on the day of the assessment. The fee is charged to accounts that fall below $10,000 for any reason, including market fluctuations, redemptions, or exchanges. When an account with less than $10,000 is closed either through redemption or exchange, the fee is charged and deducted from the proceeds. The fee applies to IRA accounts but not to retirement plans directly registered with T. Rowe Price Services or accounts maintained by intermediaries through NSCC^®Networking. If you are subject to the fee, keep it in mind when you are estimating the ongoing expenses of investing in the fund and when comparing the expenses of this fund with other funds.

You should also be aware that the expenses shown in the table highlight only your ongoing costs and do not reflect any transaction costs, such as redemption fees or sales loads. 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. To the extent a fund charges transaction costs, however, the total cost of owning that fund is higher.

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

NOTES TO FINANCIAL STATEMENTS

NOTE 1 - SIGNIFICANT ACCOUNTING POLICIES

T. Rowe Price Index Trust, Inc. (the trust) is registered under the Investment Company Act of 1940 (the 1940 Act). The Total Equity Market Index Fund (the fund), a diversified, open-end management investment company, is one portfolio established by the trust. The fund commenced operations on January 30, 1998. The fund seeks to match the performance of the entire U.S. stock market, as represented by the Dow Jones Wilshire 5000 Composite Index.

The accompanying financial statements were prepared in accordance with accounting principles generally accepted in the United States of America, which require the use of estimates made by fund management. Fund management believes that estimates and security valuations are appropriate; however actual results may differ from those estimates, and the security valuations reflected in the financial statements may differ from the value the fund ultimately realizes upon sale of the securities.

Valuation The fund values its investments and computes its net asset value per share at the close of the New York Stock Exchange (NYSE), normally 4 p.m. ET, each day that the NYSE is open for business. Equity securities listed or regularly traded on a securities exchange or in the over-the-counter market are valued at the last quoted sale price at the time the valuations are made, except for OTC Bulletin Board securities, which are valued at the mean of the latest bid and asked prices. A security that is listed or traded on more than one exchange is valued at the quotation on the exchange determined to be the primary market for such security. Listed securities not traded on a particular day are valued at the mean of the latest bid and asked prices. Debt securities with original maturities of less than one year are valued at amortized cost in local currency, which approximates fair value when combined with accrued interest.

Investments in mutual funds are valued at the mutual fund’s closing net asset value per share on the day of valuation. Financial futures contracts are valued at closing settlement prices.

Other investments, including restricted securities, and those for which the above valuation procedures are inappropriate or are deemed not to reflect fair value are stated at fair value as determined in good faith by the T. Rowe Price Valuation Committee, established by the fund’s Board of Trustees.

Redemption Fees A 0.5% fee is assessed on redemptions of fund shares held less than 90 days/3 months to deter short-term trading and protect the interests of long-term shareholders. Redemption fees are withheld from proceeds that shareholders receive from the sale or exchange of fund shares. The fees are paid to the fund, and are recorded as an increase to paid-in capital. The fees may cause the redemption price per share to differ from the net asset value per share.

Investment Transactions, Investment Income, and Distributions Income and expenses are recorded on the accrual basis. Premiums and discounts on debt securities are amortized for financial reporting purposes. Dividends received from mutual fund investments are reflected as dividend income; capital gain distributions are reflected as realized gain/loss. Dividend income and capital gain distributions are recorded on the ex-dividend date. Investment transactions are accounted for on the trade date. Realized gains and losses are reported on the identified cost basis. Payments (“variation margin”) made or received to settle the daily fluctuations in the value of futures contracts are recorded as unrealized gains or losses until the contracts are closed. Unsettled variation margin on futures contracts is reflected as other assets or liabilities, and unrealized gains and losses on futures contracts are reflected as the change in net unrealized gain or loss in the accompanying financial statements. Distributions to shareholders are recorded on the ex-dividend date. Income distributions are declared and paid on an annual basis. Capital gain distributions, if any, are declared and paid by the fund, typically on an annual basis.

NOTE 2 - INVESTMENT TRANSACTIONS

Consistent with its investment objective, the fund engages in the following practices to manage exposure to certain risks or enhance performance. The investment objective, policies, program, and risk factors of the fund are described more fully in the fund’s prospectus and Statement of Additional Information.

Futures Contracts During the year ended December 31, 2005, the fund was a party to futures contracts, which provide for the future sale by one party and purchase by another of a specified amount of a specific financial instrument at an agreed upon price, date, time, and place. Risks arise from possible illiquidity of the futures market and from movements in security values.

Securities Lending The fund lends its securities to approved brokers to earn additional income. It receives as collateral cash and U.S. government securities valued at 102% to 105% of the value of the securities on loan. Cash collateral is invested in a money market pooled trust managed by the fund’s lending agent in accordance with investment guidelines approved by fund management. Collateral is maintained over the life of the loan in an amount not less than the value of loaned securities, as determined at the close of fund business each day; any additional collateral required due to changes in security values is delivered to the fund the next business day. Although risk is mitigated by the collateral, the fund could experience a delay in recovering its securities and a possible loss of income or value if the borrower fails to return the securities. Securities lending revenue recognized by the fund consists of earnings on invested collateral and borrowing fees, net of any rebates to the borrower and compensation to the lending agent. At December 31, 2005, the value of loaned securities was $32,308,000; aggregate collateral consisted of $33,400,000 in the money market pooled trust and U.S. government securities valued at $8,000.

Other Purchases and sales of portfolio securities, other than short-term securities, aggregated $25,854,000 and $15,930,000, respectively, for the year ended December 31, 2005.

NOTE 3 - FEDERAL INCOME TAXES

No provision for federal income taxes is required since the fund intends to continue to qualify as a regulated investment company under Subchapter M of the Internal Revenue Code and distribute to shareholders all of its taxable income and gains. Federal income tax regulations differ from generally accepted accounting principles; therefore, distributions determined in accordance with tax regulations may differ significantly in amount or character from net investment income and realized gains for financial reporting purposes. Financial reporting records are adjusted for permanent book/tax differences to reflect tax character. Financial records are not adjusted for temporary differences.

Distributions during the year ended December 31, 2005 totaled $5,071,000 and were characterized as ordinary income for tax purposes. At December 31, 2005, the tax-basis components of net assets were as follows:

Pursuant to federal income tax regulations applicable to investment companies, the fund has elected to treat net capital losses realized between November 1 and December 31 of each year as occurring on the first day of the following tax year. Consequently, $550,000 of realized losses reflected in the accompanying financial statements will not be recognized for tax purposes until 2006. The fund intends to retain realized gains to the extent of available capital loss carryforwards for federal income tax purposes. During the year ended December 31, 2005, the fund utilized $413,000 of capital loss carryforwards. As of December 31, 2005, the fund had $5,639,000 of capital loss carryforwards that expire in 2009, $13,059,000 that expire in 2010, and $1,163,000 that expire in 2012.

For the year ended December 31, 2005, the fund recorded the following permanent reclassifications to reflect tax character. Reclassifications to paid-in capital relate primarily to per share rounding of distributions. Results of operations and net assets were not affected by these reclassifications.

At December 31, 2005, the cost of investments for federal income tax purposes was $346,175,000.

NOTE 4 - RELATED PARTY TRANSACTIONS

The fund is managed by T. Rowe Price Associates, Inc. (the manager or Price Associates), a wholly owned subsidiary of T. Rowe Price Group, Inc. The investment management and administrative agreement between the fund and the manager provides for an all-inclusive annual fee equal to 0.40% of the fund’s average daily net assets. The fee is computed daily and paid monthly. The agreement provides that investment management, shareholder servicing, transfer agency, accounting, and custody services are provided to the fund, and interest, taxes, brokerage commissions, directors’ fees and expenses, and extraordinary expenses are paid directly by the fund.

The fund may invest in the T. Rowe Price Reserve Investment Fund and the T. Rowe Price Government Reserve Investment Fund (collectively, the T. Rowe Price Reserve Funds), open-end management investment companies managed by Price Associates and affiliates of the fund. The T. Rowe Price Reserve Funds are offered as cash management options to mutual funds, trusts, and other accounts managed by Price Associates and/or its affiliates, and are not available for direct purchase by members of the public. The T. Rowe Price Reserve Funds pay no investment management fees. During the year ended December 31, 2005, dividend income from the T. Rowe Price Reserve Funds totaled $248,000, and the value of shares of the T. Rowe Price Reserve Funds held at December 31, 2005 and December 31, 2004 was $6,019,000 and $7,086,000, respectively.

As of December 31, 2005, T. Rowe Price Group, Inc. and/or its wholly owned subsidiaries owned 152,943 shares of the fund, representing less than 1% of the fund’s net assets.

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors of T. Rowe Price Index Trust, Inc. and
Shareholders of T. Rowe Price Total Equity Market Index Fund

In our opinion, the accompanying statement of assets and liabilities, including the portfolio of investments, and the related statements of operations and of changes in net assets and the financial highlights present fairly, in all material respects, the financial position of T. Rowe Price Total Equity Market Index Fund (one of the portfolios comprising T. Rowe Price Index Trust, Inc., hereafter referred to as the “Fund”) at December 31, 2005, 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 the 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. These financial statements and financial highlights (hereafter referred to as “financial statements”) are the responsibility of the Fund’s management; our responsibility is to express an opinion on these financial statements based on our audits. We conducted our audits of these financial statements 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. An audit 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, and evaluating the overall financial statement presentation. We believe that our audits, which included confirmation of securities at December 31, 2005 by correspondence with the custodian, brokers and by agreement to the underlying ownership records for T. Rowe Price Reserve Investment fund, provide a reasonable basis for our opinion.

PricewaterhouseCoopers LLP
Baltimore, Maryland
February 13, 2006

TAX INFORMATION (UNAUDITED) FOR THE TAX YEAR ENDED 12/31/05

We are providing this information as required by the Internal Revenue Code. The amounts shown may differ from those elsewhere in this report because of differences between tax and financial reporting requirements.

For taxable non-corporate shareholders, $4,721,000 of the fund’s income represents qualified dividend income subject to the 15% rate category.

For corporate shareholders, $4,648,000 of the fund’s income qualifies for the dividends-received deduction.

INFORMATION ON PROXY VOTING POLICIES, PROCEDURES, AND RECORDS

A description of the policies and procedures used by T. Rowe Price funds and portfolios to determine how to vote proxies relating to portfolio securities is available in each fund’s Statement of Additional Information, which you may request by calling 1-800-225-5132 or by accessing the SEC’s Web site, www.sec.gov. The description of our proxy voting policies and procedures is also available on our Web site, www.troweprice.com. To access it, click on the words “Company Info” at the top of our homepage for individual investors. Then, in the window that appears, click on the “Proxy Voting Policy” navigation button in the top left corner.

Each fund’s most recent annual proxy voting record is available on our Web site and through the SEC’s Web site. To access it through our Web site, follow the directions above, then click on the words “Proxy Voting Record” at the bottom of the Proxy Voting Policy page.

HOW TO OBTAIN QUARTERLY PORTFOLIO HOLDINGS

The fund files a complete schedule of portfolio holdings with the Securities and Exchange Commission for the first and third quarters of each fiscal year on Form N-Q. The fund’s Form N-Q is available electronically on the SEC’s Web site (www.sec.gov); hard copies may be reviewed and copied at the SEC’s Public Reference Room, 450 Fifth St. N.W., Washington, DC 20549. For more information on the Public Reference Room, call 1-800-SEC-0330.

ABOUT THE FUND’S DIRECTORS AND OFFICERS

Your fund is governed by a Board of Directors that meets regularly to review investments, performance, compliance matters, advisory fees, expenses, and other business affairs, and is responsible for protecting the interests of shareholders. The majority of the fund’s directors are independent of T. Rowe Price Associates, Inc. (T. Rowe Price); “inside” directors are officers of T. Rowe Price. The Board of Directors elects the fund’s officers, who are listed in the final table. The business address of each director and officer is 100 East Pratt Street, Baltimore, MD 21202. The Statement of Additional Information includes additional information about the fund directors and is available without charge by calling a T. Rowe Price representative at 1-800-225-5132.

Independent Directors

Name
(Year of Birth)
Year Elected *
[Number of T. Rowe Price	Principal Occupation(s) During Past 5 Years and Directorships of
Portfolios Overseen]	Other Public Companies

Jeremiah E. Casey **	Director, National Life Insurance (2001 to 8/05); Director, The Rouse
(1940)	Company, real estate developers (1990 to 2004)
2005
[59]

Anthony W. Deering	Chairman, Exeter Capital, LLC, a private investment firm (2004 to pres-
(1945)	ent); Director, Chairman of the Board, and Chief Executive Officer, The
2001	Rouse Company, real estate developers (1997 to 2004); Director,
[113]	Mercantile Bank (4/03 to present)

Donald W. Dick, Jr.	Principal, EuroCapital Advisors, LLC, an acquisition and management
(1943)	advisory firm; Chairman, President, and Chief Executive Officer, The
1994	Haven Group, a custom manufacturer of modular homes (1/04
[113]	to present)

David K. Fagin	Chairman and President, Nye Corporation (6/88 to present); Director,
(1938)	Canyon Resources Corp. and Golden Star Resources Ltd. (5/00 to
1994	present) and Pacific Rim Mining Corp. (2/02 to present)
[113]

Karen N. Horn	Managing Director and President, Global Private Client Services, Marsh
(1943)	Inc. (1999 to 2003); Managing Director and Head of International
2003	Private Banking, Bankers Trust (1996 to 1999); Director, Eli Lilly and
[113]	Company and Georgia Pacific

F. Pierce Linaweaver	President, F. Pierce Linaweaver & Associates, Inc., consulting environ-
(1934)	mental and civil engineers
2001
[113]

Theo C. Rodgers ***	President, A&R Development Corporation
(1941)
2005
[97]

John G. Schreiber	Owner/President, Centaur Capital Partners, Inc., a real estate investment
(1946)	company; Partner, Blackstone Real Estate Advisors, L.P.; Director, AMLI
2001	Residential Properties Trust
[113]

* Each independent director serves until retirement, resignation, or election of a successor.
** Elected effective October 19, 2005.
*** Elected effective April 1, 2005.

Inside Directors

Name
(Year of Birth)
Year Elected *
[Number of T. Rowe Price	Principal Occupation(s) During Past 5 Years and Directorships of
Portfolios Overseen]	Other Public Companies

James A.C. Kennedy, CFA	Director and Vice President, T. Rowe Price and T. Rowe Price Group,
(1953)	Inc.; Director, T. Rowe Price Global Asset Management Limited,
1997	T. Rowe Price Global Investment Services Limited, and T. Rowe Price
[45]	International, Inc.

James S. Riepe	Director and Vice President, T. Rowe Price; Vice Chairman of the Board,
(1943)	Director, and Vice President, T. Rowe Price Group, Inc.; Chairman of the
1990	Board and Director, T. Rowe Price Global Asset Management Limited,
[113]	T. Rowe Price Global Investment Services Limited, T. Rowe Price
	Investment Services, Inc., T. Rowe Price Retirement Plan Services, Inc.,
	and T. Rowe Price Services, Inc.; Chairman of the Board, Director,
	President, and Trust Officer, T. Rowe Price Trust Company; Director,
	T. Rowe Price International, Inc.; Chairman of the Board, all funds

* Each inside director serves until retirement, resignation, or election of a successor.

Officers

Name (Year of Birth)
Title and Fund(s) Served	Principal Occupation(s)

E. Frederick Bair, CFA, CPA (1969)	Vice President, T. Rowe Price and T. Rowe Price
President, Index Trust	Trust Company

Joseph A. Carrier (1960)	Vice President, T. Rowe Price, T. Rowe Price
Treasurer, Index Trust	Group, Inc., T. Rowe Price Investment Services,
	Inc., and T. Rowe Price Trust Company

Wendy R. Diffenbaugh (1953)	Vice President, T. Rowe Price
Vice President, Index Trust

Roger L. Fiery III, CPA (1959)	Vice President, T. Rowe Price, T. Rowe Price
Vice President, Index Trust	Group, Inc., T. Rowe Price International, Inc.,
	and T. Rowe Price Trust Company

John R. Gilner (1961)	Chief Compliance Officer and Vice President,
Chief Compliance Officer, Index Trust	T. Rowe Price; Vice President, T. Rowe Price
	Group, Inc., and T. Rowe Price Investment
	Services, Inc.

Gregory S. Golczewski (1966)	Vice President, T. Rowe Price and T. Rowe Price
Vice President, Index Trust	Trust Company

Ann M. Holcomb, CFA (1972)	Vice President, T. Rowe Price and T. Rowe Price
Vice President, Index Trust	Trust Company

Henry H. Hopkins (1942)	Director and Vice President, T. Rowe Price
Vice President, Index Trust	Investment Services, Inc., T. Rowe Price Services,
	Inc., and T. Rowe Price Trust Company; Vice
	President, T. Rowe Price, T. Rowe Price Group,
	Inc., T. Rowe Price International, Inc., and T. Rowe
	Price Retirement Plan Services, Inc.

Patricia B. Lippert (1953)	Assistant Vice President, T. Rowe Price and
Secretary, Index Trust	T. Rowe Price Investment Services, Inc.

Sudhir Nanda, Ph.D., CFA (1959)	Vice President, T. Rowe Price and T. Rowe Price
Vice President, Index Trust	Group, Inc.

Ken D. Uematsu, CFA (1966)	Assistant Vice President, T. Rowe Price
Vice President, Index Trust

Julie L. Waples (1970)	Vice President, T. Rowe Price
Vice President, Index Trust

Richard T. Whitney, CFA (1958)	Vice President, T. Rowe Price, T. Rowe Price
Vice President, Index Trust	Group, Inc., T. Rowe Price International, Inc.,
	and T. Rowe Price Trust Company

Paul W. Wojcik, CFA (1970)	Vice President, T. Rowe Price and T. Rowe Price
Vice President, Index Trust	Group, Inc.

Unless otherwise noted, officers have been employees of T. Rowe Price or T. Rowe Price International for at
least five years.

Item 2. Code of Ethics.

The registrant has adopted a code of ethics, as defined in Item 2 of Form N-CSR, applicable to its principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions. A copy of this code of ethics is filed as an exhibit to this Form N-CSR. No substantive amendments were approved or waivers were granted to this code of ethics during the period covered by this report.

Item 3. Audit Committee Financial Expert.

The registrant’s Board of Directors/Trustees has determined that Mr. Donald W. Dick Jr. qualifies as an audit committee financial expert, as defined in Item 3 of Form N-CSR. Mr. Dick is considered independent for purposes of Item 3 of Form N-CSR.

Item 4. Principal Accountant Fees and Services.

(a) – (d) Aggregate fees billed to the registrant for the last two fiscal years for professional services rendered by the registrant’s principal accountant were as follows:

	2005	2004
Audit Fees	$7,790	$7,336
Audit-Related Fees	501	1,033
Tax Fees	2,213	1,990
All Other Fees	393	-

Audit fees include amounts related to the audit of the registrant’s annual financial statements and services normally provided by the accountant in connection with statutory and regulatory filings. Audit-related fees include amounts reasonably related to the performance of the audit of the registrant’s financial statements and specifically include the issuance of a report on internal controls. Tax fees include amounts related to services for tax compliance, tax planning, and tax advice. The nature of these services specifically includes the review of distribution calculations and the preparation of Federal, state, and excise tax returns. All other fees include the registrant’s pro-rata share of amounts for agreed-upon procedures in conjunction with service contract approvals by the registrant’s Board of Directors/Trustees.

(e)(1) The registrant’s audit committee has adopted a policy whereby audit and non-audit services performed by the registrant’s principal accountant for the registrant, its investment adviser, and any entity controlling, controlled by, or under common control with the investment adviser that provides ongoing services to the registrant require pre-approval in advance at regularly scheduled audit committee meetings. If such a service is required between regularly scheduled audit committee meetings, pre-approval may be authorized by one audit committee member with ratification at the next scheduled audit committee meeting. Waiver of pre-approval for audit or non-audit services requiring fees of a de minimis amount is not permitted.

(2) No services included in (b) – (d) above were approved pursuant to paragraph (c)(7)(i)(C) of Rule 2-01 of Regulation S-X.

(f) Less than 50 percent of the hours expended on the principal accountant’s engagement to audit the registrant’s financial statements for the most recent fiscal year were attributed to work performed by persons other than the principal accountant’s full-time, permanent employees.

(g) The aggregate fees billed for the most recent fiscal year and the preceding fiscal year by the registrant’s principal accountant for non-audit services rendered to the registrant, its investment adviser, and any entity controlling, controlled by, or under common control with the investment adviser that provides ongoing services to the registrant were $1,008,000 and $903,000, respectively, and were less than the aggregate fees billed for those same periods by the registrant’s principal accountant for audit services rendered to the T. Rowe Price Funds.

(h) All non-audit services rendered in (g) above were pre-approved by the registrant’s audit committee. Accordingly, these services were considered by the registrant’s audit committee in maintaining the principal accountant’s independence.

Item 5. Audit Committee of Listed Registrants.

Not applicable.

Item 6. Schedule of Investments.

Not applicable. The complete schedule of investments is included in Item 1 of this Form N-CSR.

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

Not applicable.

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

Not applicable.

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

Not applicable.

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

Not applicable.

Item 11. Controls and Procedures.

(a) The registrant’s principal executive officer and principal financial officer have evaluated the registrant’s disclosure controls and procedures within 90 days of this filing and have concluded that the registrant’s disclosure controls and procedures were effective, as of that date, in ensuring that information required to be disclosed by the registrant in this Form N-CSR was recorded, processed, summarized, and reported timely.

(b) The registrant’s principal executive officer and principal financial officer are aware of no change in the registrant’s internal control over financial reporting that occurred during the registrant’s second fiscal quarter covered by this report that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting.

Item 12. Exhibits.

(a)(1) The registrant’s code of ethics pursuant to Item 2 of Form N-CSR is attached.

(2) Separate certifications by the registrant's principal executive officer and principal financial officer, pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 and required by Rule 30a-2(a) under the Investment Company Act of 1940, are attached.

(3) Written solicitation to repurchase securities issued by closed-end companies: not applicable.

(b) A certification by the registrant's principal executive officer and principal financial officer, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 and required by Rule 30a-2(b) under the Investment Company Act of 1940, is attached.


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.

T. Rowe Price Index Trust, Inc.


By	/s/ James S. Riepe
	James S. Riepe
	Principal Executive Officer

Date	February 21, 2006


	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	/s/ James S. Riepe
	James S. Riepe
	Principal Executive Officer

Date	February 21, 2006



By	/s/ Joseph A. Carrier
	Joseph A. Carrier
	Principal Financial Officer

Date	February 21, 2006