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: 811-4441 

T. Rowe Price GNMA Fund

(Exact name of registrant as specified in charter) 

100 East Pratt Street, Baltimore, MD 21202 

(Address of principal executive offices) 

David Oestreicher 

 100 East Pratt Street, Baltimore, MD 21202 

 (Name and address of agent for service) 

Registrant’s telephone number, including area code: (410) 345-2000 

Date of fiscal year end: May 31 

Date of reporting period: May 31, 2011 

Item 1: Report to Shareholders

 GNMA Fund May 31, 2011 

The views and opinions in this report were current as of May 31, 2011. 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, 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.

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Manager’s Letter

Fellow Shareholders

GNMAs and other longer-term bonds generated decent gains over the past six months and year. Continuing economic weakness, subdued inflation pressures, and Federal Reserve policy caused longer-term Treasury yields to decline over the past year, helping to support bond prices. Mortgage-backed securities (MBS) benefited from healthy demand and subdued refinancing activity, allowing them to perform somewhat better than the overall investment-grade bond market over the past six months after having lagged earlier in our reporting period. The GNMA Fund recorded a modest gain and slightly outperformed its peers while trailing its Barclays benchmark in both periods.

ECONOMY AND INTEREST RATES

The U.S. economy continued on a path of steady but frustratingly slow and uneven recovery over the past year. Healthy exports boosted the manufacturing sector, while subdued growth in consumer income and spending helped the service sector expand at a more modest pace. After struggling through much of the latter half of 2010, the labor market gained some momentum early in 2011 but appeared to moderate again as our reporting period ended. The housing market remained especially weak, with home construction falling to record low levels while housing prices resumed their decline after the homebuyer tax incentives ended.

According to the Commerce Department’s latest estimates, economic growth improved through the second half of 2010 but then decelerated substantially in the first quarter of 2011. One culprit appears to have been political turmoil in the Middle East and North Africa (MENA) region, which led to a surge in oil and gasoline prices that took a bite out of consumers’ purchasing power. Another factor may have been the devastating earthquake and tsunami that struck northeastern Japan in March 2011, which caused problems in global manufacturing supply chains, particularly in the auto sector.

In November 2010, Federal Reserve Chairman Ben Bernanke announced another round of quantitative easing, dubbed “QE2,” in which the Fed would purchase up to $600 billion of Treasury securities through June 2011. The goal of the program was to put a ceiling on Treasury yields, thereby driving investors into riskier fixed income sectors and stocks. The Fed appeared to base its move on the theory that decreasing yields on riskier debt instruments, such as corporate bonds and MBS, facilitates borrowing and economic growth, while an appreciating stock market incites consumer confidence through the “wealth effect.” It seems markets anticipated further stimulus, as risk sectors began to rally months in advance of—and continued to rally through—the November QE2 announcement. The results are hard to dispute—for instance, the large-cap S&P 500 stock index returned 25.95% over the 12-month period ended May 31, 2011, despite concerns from many critics that QE2 will bring about future inflationary pressures.

Despite the Fed’s QE2 purchases, long-term Treasury yields rose beginning in the autumn before falling back in April and May in response to weaker economic data and increased concerns about the credit situation in Europe. The increase in Treasury yields in the spring drove a corresponding rise in MBS yields, although the gap between MBS yields and the 10-year Treasury note—known as the yield spread—narrowed a bit as the period progressed. GNMA yields ended the period lower than they were a year ago but slightly higher than their level six months ago.

PERFORMANCE AND STRATEGY REVIEW

The GNMA Fund returned 2.33% for the six-month period and 5.58% for the 12-month period ended May 31, 2011. As shown in the table, the portfolio modestly underperformed the Barclays Capital U.S. GNMA Index yet outperformed the Lipper GNMA Funds Average in both periods. The fund’s performance continued to compare favorably with the majority of its peers over the long term. (Based on cumulative total return, the fund was ranked 22 of 68, 35 of 63, 30 of 56, and 18 of 49 GNMA funds for the 1-, 3-, 5-, and 10-year periods ended May 31, 2011, respectively. Results will vary for other time periods. Past performance cannot guarantee future results.)

Fixed income spread sectors—those that offer more yield and credit risk than Treasuries—offered strong absolute returns and fared well on a relative basis over the past 12 months, as measured by Barclays Capital. MBS guaranteed by Ginnie Mae, which compose the bulk of the fund, bested Treasuries by nearly 4% during the period and outperformed the broader mortgage market, which also includes MBS backed by Fannie Mae and Freddie Mac. Non-GNMA securities held in the fund also outperformed Treasuries. Commercial mortgage-backed securities (CMBS) were particularly strong, surpassing Treasury returns by over 10%. This performance is particularly impressive given some of the obstacles facing the financial markets over the period, such as geopolitical strife in the MENA region, continued European fiscal challenges, and the terrible natural disasters that occurred in Japan in March.

MBS continued to benefit from favorable technical factors. Demand was strong from traditional investors such as money managers and banks. In addition, real estate investment trusts, or REITs, emerged as a solid source of demand. Because REITs use leverage, they have benefited from the steep yield curve, which allows them to borrow cheaply at short-term rates and invest in MBS at higher rates over the longer term. On the supply side, net issuance of new securities remained low, also supporting prices.

Finally, the combination of a tightening in credit underwriting and stable but higher interest rates over the course of the last six months provided a favorable fundamental backdrop for MBS. Many homeowners remain “underwater” on their homes, with the balance of their loan higher than the value of their house. When combined with still-tight credit conditions, the environment makes it quite difficult to take advantage of low rates by prepaying an old mortgage and securing a new one. What was bad news for homeowners was, in this case, good news for investors, who benefited from interest income for a longer period than would have been the case if prepayments had risen.

Much of our time is dedicated to careful selection of MBS pools with both appealing valuations and structures that respond well to changes in interest rates. To benefit from the slow prepayment environment described above, the fund holds several positions in interest-only MBS, which excelled over the period. Likewise, a modest allocation to top-tier, AAA rated CMBS has been a positive contributor to performance.

OUTLOOK

Valuations within the mortgage sector appear fair following the strong performance the sector delivered over the course of the last few years. Muted refinance activity, a stable interest rate environment, and robust demand for the asset class may continue to support valuations in the near term. Of course, if interest rates start to rise in a meaningful way, mortgage bond prices will suffer. We believe the fund is well positioned if interest rates rise, though we expect rate increases to be modest in the current economic environment.

Despite the many challenges facing the global economy, we expect gradual improvement in the pace of the U.S. recovery. As of this writing, our internal projections call for gross domestic product to grow 2.8% in 2011. We also expect the Fed to tighten policy slowly, including bringing an end to QE2 in June 2011 and using other tools at its disposal over the course of 2012. Continued growth and gradually rising inflation pressures, combined with the federal government’s massive borrowing needs, are likely to eventually place upward pressure on interest rates. This could enable fixed income investors to earn higher income, but it could also mean bond price declines.

Successfully navigating a sputtering economic recovery, global geopolitical turbulence, and uncertainty around future public policy remains of utmost importance for investors. However, the voracious appetite for yield in an environment of all-time low interest rates seems to be overwhelming these broader concerns for many. We will continue to rely on our risk-aware approach, however, seeking to capture what yields are possible in this environment while avoiding any pitfalls that remain.

As always, thank you for investing with T. Rowe Price.

Respectfully submitted,

Andrew McCormick
President of the fund and chairman of the Investment Advisory Committee

June 10, 2011

The committee chairman has day-to-day responsibility for managing the portfolio and works with committee members in developing and executing each fund’s investment program.

RISK OF GNMA FUND INVESTING

Even though principal and interest payments on GNMAs are guaranteed, an increase in interest rates can cause share price to decline, resulting in a loss of principal. Investors in bond funds are also subject to several other types of risk—interest rate risk, credit risk, prepayment risk, extension risk, and derivatives risk. Since the fund invests primarily in GNMAs, which are backed by the full faith and credit of the U.S. government, its exposure to credit risk is low. A mortgage-backed bond, unlike most other bonds, can be hurt when interest rates fall because homeowners tend to refinance and prepay principal. Prepayments can cause the average maturity of the portfolio to shorten, require the fund to reinvest proceeds at lower interest rates, or even cause certain bonds’ prices to fall below what the fund paid for them, resulting in a capital loss. Increased interest rates can cause the fund’s average maturity to lengthen unexpectedly due to a drop in mortgage prepayments. Shareholders are also exposed to derivatives risk, the potential that our investments in these complex and volatile instruments could affect the fund’s share price.

GLOSSARY

Barclays Capital U.S. GNMA Index: Tracks the performance of mortgage-backed pass-through securities of the Government National Mortgage Association (GNMA).

Basis point: One one-hundredth of one percentage point, or 0.01%.

Current coupon GNMA: An index that tracks a theoretical 30-year GNMA mortgage that is priced at par. It is computed by interpolating from the two 30-year GNMAs whose prices bracket par.

Duration: A measure of a bond or bond fund’s sensitivity to changes in interest rates. For example, a fund with a duration of five years would fall about 5% in response to a one-percentage-point rise in rates, and vice versa.

Extension risk: As interest rates rise, the likelihood of prepayment decreases, and the average life and duration of mortgage securities lengthens. Investors are unable to capitalize on higher interest rates because their investment is locked in at a lower rate for a longer period of time.

Gross domestic product (GDP): The total market value of all goods and services produced in a country in a given year.

Lipper averages: The averages of available mutual fund performance returns for specified time periods in categories defined by Lipper Inc.

SEC yield (30-day): A method of calculating a fund’s yield that assumes all portfolio securities are held until maturity. Yield will vary and is not guaranteed.

Total return: The annual rate of return on a bond, taking into account interest income, plus appreciation or depreciation. If a bond is held to maturity, its total return equals its yield to maturity.

Weighted average maturity: A measure of a fund’s interest rate sensitivity. In general, the longer the average maturity, the greater the fund’s sensitivity to interest rate changes. The weighted average maturity may take into account the interest rate readjustment dates for certain securities. Money funds must maintain a weighted average maturity of less than 60 days.

Yield curve: A graph depicting the relationship between yields and maturity dates for a set of similar securities. These curves are in constant flux. One of the key activities in managing any fixed income portfolio is to study the trends reflected by yield curves.

Performance and Expenses

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.

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 expenses based on the fund’s actual returns. 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 annual small-account maintenance fee of $10, generally for accounts with less than $2,000 ($500 for UGMA/UTMA). The fee is waived for any investor whose T. Rowe Price mutual fund accounts total $25,000 or more, accounts employing automatic investing, and IRAs and other retirement plan accounts that utilize a prototype plan sponsored by T. Rowe Price (although a separate custodial or administrative fee may apply to such accounts). This fee is not included in the accompanying table. 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.

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

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

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

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

NOTES TO FINANCIAL STATEMENTS 

T. Rowe Price GNMA Fund (the fund), is registered under the Investment Company Act of 1940 (the 1940 Act) as a diversified, open-end management investment company. The fund commenced operations on November 26, 1985. The fund seeks high current income consistent with high overall credit quality and moderate price fluctuation by investing at least 80% of its total assets in GNMA securities backed by the full faith and credit of the U.S. government.

NOTE 1 - SIGNIFICANT ACCOUNTING POLICIES

Basis of Preparation The accompanying financial statements were prepared in accordance with accounting principles generally accepted in the United States of America (GAAP), which require the use of estimates made by management. Management believes that estimates and valuations are appropriate; however, actual results may differ from those estimates, and the valuations reflected in the accompanying financial statements may differ from the value ultimately realized upon sale or maturity.

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. Paydown gains and losses are recorded as an adjustment to interest income. Dividends received from mutual fund investments are reflected as dividend income; capital gain distributions are reflected as realized gain/loss. Earnings on investments recognized as partnerships for federal income tax purposes reflect the tax character of such earnings. Dividend income and capital gain distributions are recorded on the ex-dividend date. Income tax-related interest and penalties, if incurred, would be recorded as income tax expense. Investment transactions are accounted for on the trade date. Realized gains and losses are reported on the identified cost basis. Distributions to shareholders are recorded on the ex-dividend date. Income distributions are declared daily and paid monthly. Capital gain distributions, if any, are generally declared and paid by the fund annually.

Credits The fund earns credits on temporarily uninvested cash balances held at the custodian, which reduce the fund’s custody charges. Custody expense in the accompanying financial statements is presented before reduction for credits, which are reflected as expenses paid indirectly.

New Accounting Pronouncement On June 1, 2010, the fund adopted new accounting guidance that requires enhanced disclosures about fair value measurements in the financial statements. Adoption of this guidance had no impact on the fund’s net assets or results of operations.

NOTE 2 - VALUATION

The fund’s financial instruments are reported at fair value as defined by GAAP. The fund determines the values of its assets and liabilities 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.

Valuation Methods Debt securities are generally traded in the over-the-counter (OTC) market. Securities with remaining maturities of one year or more at the time of acquisition are valued at prices furnished by dealers who make markets in such securities or by an independent pricing service, which considers the yield or price of bonds of comparable quality, coupon, maturity, and type, as well as prices quoted by dealers who make markets in such securities. Securities with remaining maturities of less than one year at the time of acquisition generally use amortized cost in local currency to approximate fair value. However, if amortized cost is deemed not to reflect fair value or the fund holds a significant amount of such securities with remaining maturities of more than 60 days, the securities are valued at prices furnished by dealers who make markets in such securities or by an independent pricing service.

Investments in mutual funds are valued at the mutual fund’s closing net asset value per share on the day of valuation. Investments in private investment companies are valued at the entity’s net asset value (or equivalent) as of the valuation date. Financial futures contracts are valued at closing settlement prices. Swaps are valued at prices furnished by independent swap dealers or by an independent pricing service.

Other investments, including restricted securities, and those financial instruments 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.

Valuation Inputs Various inputs are used to determine the value of the fund’s financial instruments. These inputs are summarized in the three broad levels listed below:

Level 1 – quoted prices in active markets for identical financial instruments

Level 2 – observable inputs other than Level 1 quoted prices (including, but not limited to, quoted prices for similar financial instruments, interest rates, prepayment speeds, and credit risk)

Level 3 – unobservable inputs

Observable inputs are those based on market data obtained from sources independent of the fund, and unobservable inputs reflect the fund’s own assumptions based on the best information available. The input levels are not necessarily an indication of the risk or liquidity associated with financial instruments at that level. The following table summarizes the fund’s financial instruments, based on the inputs used to determine their values on May 31, 2011:

Following is a reconciliation of the fund’s Level 3 holdings for the year ended May 31, 2011. Gain (loss) reflects both realized and change in unrealized gain (loss) on Level 3 holdings during the period, if any, and is included on the accompanying Statement of Operations. The change in unrealized gain (loss) on Level 3 instruments held at May 31, 2011, totaled $(1,286,000) for the year ended May 31, 2011.

NOTE 3 - DERIVATIVE INSTRUMENTS

During the year ended May 31, 2011, the fund invested in derivative instruments. As defined by GAAP, a derivative is a financial instrument whose value is derived from an underlying security price, foreign exchange rate, interest rate, index of prices or rates, or other variable; it requires little or no initial investment and permits or requires net settlement. The fund invests in derivatives only if the expected risks and rewards are consistent with its investment objectives, policies, and overall risk profile, as described in its prospectus and Statement of Additional Information. The fund may use derivatives for a variety of purposes, such as seeking to hedge against declines in principal value, increase yield, invest in an asset with greater efficiency and at a lower cost than is possible through direct investment, or to adjust portfolio duration and credit exposure. The risks associated with the use of derivatives are different from, and potentially much greater than, the risks associated with investing directly in the instruments on which the derivatives are based. Investments in derivatives can magnify returns positively or negatively; however, the fund at all times maintains sufficient cash reserves, liquid assets, or other SEC-permitted asset types to cover the settlement obligations under its open derivative contracts.

The fund values its derivatives at fair value, as described below and in Note 2, and recognizes changes in fair value currently in its results of operations. Accordingly, the fund does not follow hedge accounting, even for derivatives employed as economic hedges. The fund does not offset the fair value of derivative instruments against the right to reclaim or obligation to return collateral.

The following table summarizes the fair value of the fund’s derivative instruments held as of May 31, 2011, and the related location on the accompanying Statement of Assets and Liabilities, presented by primary underlying risk exposure:

Additionally, the amount of gains and losses on derivative instruments recognized in fund earnings during the year ended May 31, 2011, and the related location on the accompanying Statement of Operations is summarized in the following table by primary underlying risk exposure:

Futures Contracts The fund is subject to interest rate risk in the normal course of pursuing its investment objectives and uses futures contracts to help manage such risk. The fund may enter into futures contracts to manage exposure to interest rate and yield curve movements, security prices, foreign currencies, credit quality, and mortgage prepayments; as an efficient means of adjusting exposure to all or part of a target market; to enhance income; as a cash management tool; and/or to adjust portfolio duration and credit exposure. A futures contract provides for the future sale by one party and purchase by another of a specified amount of a particular underlying financial instrument at an agreed-upon price, date, time, and place. The fund currently invests only in exchange-traded futures, which generally are standardized as to maturity date, underlying financial instrument, and other contract terms. Upon entering into a futures contract, the fund is required to deposit with the broker cash or securities in an amount equal to a certain percentage of the contract value (initial margin deposit); the margin deposit must then be maintained at the established level over the life of the contract. Subsequent payments are made or received by the fund each day to settle daily fluctuations in the value of the contract (variation margin), which reflect changes in the value of the underlying financial instrument. Variation margin is recorded as unrealized gain or loss until the contract is closed. The value of a futures contract included in net assets is the amount of unsettled variation margin; net variation margin receivable is reflected as an asset, and net variation margin payable is reflected as a liability on the accompanying Statement of Assets and Liabilities. Risks related to the use of futures contracts include possible illiquidity of the futures markets, contract prices that can be highly volatile and imperfectly correlated to movements in hedged security values and interest rates, and potential losses in excess of the fund’s initial investment. During the year ended May 31, 2011, the fund’s exposure to futures, based on underlying notional amounts, was generally between 0% and 9% of net assets.

Interest Rate Swaps The fund is subject to interest rate risk in the normal course of pursuing its investment objectives and uses swap contracts to help manage such risk. The fund may use swaps in an effort to manage exposure to changes in interest rates and credit quality, to adjust overall exposure to certain markets, to enhance total return or protect the value of portfolio securities, to serve as a cash management tool, and/or to adjust portfolio duration and credit exposure. Interest rate swaps are agreements to exchange cash flows based on the difference between specified interest rates applied to a notional principal amount for a specified period of time. The value of a swap included in net assets is the unrealized gain or loss on the contract plus or minus any unamortized premiums paid or received, respectively. Appreciated swaps and premiums paid are reflected as assets, and depreciated swaps and premiums received are reflected as liabilities on the accompanying Statement of Assets and Liabilities. Net periodic receipts or payments required by swaps are accrued daily and are recorded as realized gain or loss for financial reporting purposes; fluctuations in the fair value of swaps are reflected in the change in net unrealized gain or loss and are reclassified to realized gain or loss upon termination prior to maturity or cash settlement. Risks related to the use of interest rate swaps include the potential for unanticipated movements in interest and/or currency rates, the possible failure of a counterparty to perform in accordance with the terms of the swap agreements, potential government regulation that could adversely affect the fund’s swap investments, and potential losses in excess of the fund’s initial investment. During the year ended May 31, 2011, the fund’s exposure to swaps, based on underlying notional amounts, was generally between 0% and 17% of net assets.

NOTE 4 - OTHER INVESTMENT TRANSACTIONS

Consistent with its investment objective, the fund engages in the following practices to manage exposure to certain risks and/or to 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.

Restricted Securities The fund may invest in securities that are subject to legal or contractual restrictions on resale. Prompt sale of such securities at an acceptable price may be difficult and may involve substantial delays and additional costs.

TBA Purchase and Sale Commitments During the year ended May 31, 2011, the fund entered into to be announced (TBA) purchase and/or sale commitments, pursuant to which it agrees to purchase or sell, respectively, mortgage-backed securities for a fixed unit price, with payment and delivery at a scheduled future date beyond the customary settlement period for such mortgage-backed securities. With TBA transactions, the particular securities to be delivered are not identified at the trade date; however, delivered securities must meet specified terms, including issuer, rate, and mortgage term, and be within industry-accepted “good delivery” standards. The fund generally enters into TBA purchase transactions with the intention of taking possession of the underlying mortgage securities; however, for either purchase or sale transactions, the fund also may extend the settlement by “rolling” the transaction. Until settlement, the fund maintains cash reserves and liquid assets sufficient to settle its TBA commitments.

Dollar Rolls During the year ended May 31, 2011, the fund entered into dollar roll transactions, pursuant to which it sells a mortgage-backed TBA or security and simultaneously purchases a similar, but not identical, TBA with the same issuer, rate, and terms. The fund may execute a “roll” to obtain better underlying mortgage securities or to enhance returns. The fund generally enters into dollar roll transactions with the intention of taking possession of the underlying mortgage securities, but may close a contract prior to settlement or “roll” settlement to a later date if deemed to be in the best interest of shareholders. Actual mortgages received by the fund may be less favorable than those anticipated. The fund accounts for dollar roll transactions as purchases and sales, which has the effect of increasing its portfolio turnover rate.

T. Rowe Price Term Asset-Backed Opportunity Fund, L.L.C. During the year ended May 31, 2011, the fund was invested in the T. Rowe Price Term Asset-Backed Opportunity Fund, L.L.C. (private fund), a private investment company managed by T. Rowe Price Associates, Inc. that participates in the Term Asset-Backed Securities Loan Facility (TALF) program created and administered by the Federal Reserve Bank of New York (FRBNY). The TALF program provided eligible borrowers with term loans secured by eligible asset-backed securities and/or commercial mortgage-backed securities, which were either owned by the borrower or purchased by the borrower and subsequently pledged as collateral for a TALF loan. TALF loans generally are nonrecourse in nature. The private fund is treated as a partnership for federal income tax purposes. It has a limited life extending five years from the date on which the TALF program closed for any new loans, which was June 30, 2010. The private fund can have two possible extensions (one year each) with the consent of a majority of its investors. Invested capital generally will be returned to investors as underlying securities are liquidated and the TALF loans are repaid or mature, with the balance paid at maturity of the private fund. Ownership interests in the private fund may not be redeemed, sold, or assigned. As of May 31, 2011, outstanding capital commitments may no longer be called by the private fund.

Counterparty Risk and Collateral The fund has entered into collateral agreements with certain counterparties to mitigate counterparty risk associated with certain over-the-counter (OTC) financial instruments, including swaps, forward currency exchange contracts, TBA purchase commitments, and OTC options (collectively, covered OTC instruments). Subject to certain minimum exposure requirements (which typically range from $100,000 to $500,000), collateral requirements generally are determined and transfers made based on the net aggregate unrealized gain or loss on all OTC instruments covered by a particular collateral agreement with a specified counterparty. Collateral, both pledged by the fund to a counterparty and pledged by a counterparty to the fund, is held in a segregated account by a third-party agent and can be in the form of cash or debt securities issued by the U.S. government or related agencies. Securities posted as collateral by the fund to a counterparty are so noted in the accompanying Portfolio of Investments and remain in the fund’s net assets. As of May 31, 2011, securities valued at $1,940,000 had been posted by the fund to counterparties. In accordance with GAAP, cash pledged by counterparties to the fund is included in the fund’s net assets; however, securities pledged by counterparties to the fund are not recorded by the fund. As of May 31, 2011, collateral pledged by counterparties to the fund consisted of $627,000 cash.

At any point in time, the fund’s risk of loss from counterparty credit risk on covered OTC instruments is the aggregate unrealized gain on appreciated covered OTC instruments in excess of collateral, if any, pledged by the counterparty to the fund. Counterparty risk related to exchange-traded futures and options contracts is minimal because the exchange’s clearinghouse provides protection against counterparty defaults. In accordance with the terms of the relevant derivatives agreements, counterparties to OTC derivatives may be able to terminate derivative contracts prior to maturity after the occurrence of certain stated events, such as a decline in net assets above a certain percentage or a failure by the fund to perform its obligations under the contract. Upon termination, all transactions would typically be liquidated and a net amount would be owed by or payable to the fund. Generally, for exchange-traded derivatives such as futures and options, each broker, in its sole discretion, may change margin requirements applicable to the fund.

Other Purchases and sales of portfolio securities other than short-term and U.S. government securities aggregated $55,448,000 and $47,985,000, respectively, for the year ended May 31, 2011. Purchases and sales of U.S. government securities aggregated $3,562,451,000 and $3,477,614,000, respectively, for the year ended May 31, 2011.

NOTE 5 - 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. Distributions determined in accordance with federal income tax regulations may differ 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 but are not adjusted for temporary differences.

The fund files U.S. federal, state, and local tax returns as required. The fund’s tax returns are subject to examination by the relevant tax authorities until expiration of the applicable statute of limitations, which is generally three years after the filing of the tax return but which can be extended to six years in certain circumstances. Tax returns for open years have incorporated no uncertain tax positions that require a provision for income taxes.

Reclassifications to paid-in capital relate primarily to a tax practice that treats a portion of the proceeds from each redemption of capital shares as a distribution of taxable net investment income and/or realized capital gain. Reclassifications between income and gain relate primarily to the character of paydown gains and losses on asset-backed securities. For the year ended May 31, 2011, the following reclassifications were recorded to reflect tax character; there was no impact on results of operations or net assets:

Distributions during the years ended May 31, 2011 and May 31, 2010, totaled $62,348,000 and $64,494,000, respectively, and were characterized as ordinary income for tax purposes. At May 31, 2011, the tax-basis cost of investments and components of net assets were as follows:

The fund intends to retain realized gains to the extent of available capital loss carryforwards. During the year ended May 31, 2011, the fund utilized $26,383,000 of capital loss carryforwards.

NOTE 6 - RELATED PARTY TRANSACTIONS

The fund is managed by T. Rowe Price Associates, Inc. (Price Associates), a wholly owned subsidiary of T. Rowe Price Group, Inc. (Price Group). The investment management agreement between the fund and Price Associates provides for an annual investment management fee, which is computed daily and paid monthly. The fee consists of an individual fund fee, equal to 0.15% of the fund’s average daily net assets, and a group fee. The group fee rate is calculated based on the combined net assets of certain mutual funds sponsored by Price Associates (the group) applied to a graduated fee schedule, with rates ranging from 0.48% for the first $1 billion of assets to 0.28% for assets in excess of $300 billion. The fund’s group fee is determined by applying the group fee rate to the fund’s average daily net assets. At May 31, 2011, the effective annual group fee rate was 0.30%. In addition, the fund has entered into service agreements with Price Associates and two wholly owned subsidiaries of Price Associates (collectively, Price). Price Associates computes the daily share price and provides certain other administrative services to the fund. T. Rowe Price Services, Inc., provides shareholder and administrative services in its capacity as the fund’s transfer and dividend disbursing agent. T. Rowe Price Retirement Plan Services, Inc., provides subaccounting and recordkeeping services for certain retirement accounts invested in the fund. For the year ended May 31, 2011, expenses incurred pursuant to these service agreements were $119,000 for Price Associates; $625,000 for T. Rowe Price Services, Inc.; and $188,000 for T. Rowe Price Retirement Plan Services, Inc. The total amount payable at period-end pursuant to these service agreements is reflected as Due to Affiliates in the accompanying financial statements.

The fund is also one of several mutual funds sponsored by Price Associates (underlying Price funds) in which the T. Rowe Price Spectrum Funds (Spectrum Funds) may invest. The Spectrum Funds do not invest in the underlying Price funds for the purpose of exercising management or control. Pursuant to a special servicing agreement, expenses associated with the operation of the Spectrum Funds are borne by each underlying Price fund to the extent of estimated savings to it and in proportion to the average daily value of its shares owned by the Spectrum Funds. Expenses allocated under this agreement are reflected as shareholder servicing expense in the accompanying financial statements. For the year ended May 31, 2011, the fund was allocated $765,000 of Spectrum Funds’ expenses, of which $535,000 related to services provided by Price. The amount payable at period-end pursuant to this agreement is reflected as Due to Affiliates in the accompanying financial statements. At May 31, 2011, approximately 37% of the outstanding shares of the fund were held by the Spectrum Funds.

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 Investment Funds), open-end management investment companies managed by Price Associates and considered affiliates of the fund. The T. Rowe Price Reserve Investment 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 Investment Funds pay no investment management fees.

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Shareholders of T. Rowe Price GNMA 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 GNMA Fund (the “Fund”) at May 31, 2011, 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 May 31, 2011 by correspondence with the custodian and brokers, and confirmation of the underlying funds by correspondence with the transfer agent, provide a reasonable basis for our opinion.

PricewaterhouseCoopers LLP
Baltimore, Maryland
July 15, 2011

TAX INFORMATION (UNAUDITED) FOR THE TAX YEAR ENDED 5/31/11

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.

The fund’s distributions to shareholders included:

• $684,000 from short-term capital gains,

• $3,185,000 from long-term capital gains, subject to the 15% rate gains category.

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 website, sec.gov. The description of our proxy voting policies and procedures is also available on our website, troweprice.com. To access it, click on the words “Our Company” at the top of our corporate homepage. Then, when the next page appears, click on the words “Proxy Voting Policies” on the left side of the page.

Each fund’s most recent annual proxy voting record is available on our website and through the SEC’s website. To access it through our website, follow the directions above, then click on the words “Proxy Voting Records” on the right side of the Proxy Voting Policies 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 website (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.

APPROVAL OF INVESTMENT MANAGEMENT AGREEMENT

On March 9, 2011, the fund’s Board of Directors (Board) unanimously approved the continuation of the investment advisory contract (Contract) between the fund and its investment advisor, T. Rowe Price Associates, Inc. (Advisor). The Board considered a variety of factors in connection with its review of the Contract, also taking into account information provided by the Advisor during the course of the year, as discussed below:

Services Provided by the Advisor
The Board considered the nature, quality, and extent of the services provided to the fund by the Advisor. These services included, but were not limited to, management of the fund’s portfolio and a variety of related activities, as well as financial and administrative services, reporting, and communications. The Board also reviewed the background and experience of the Advisor’s senior management team and investment personnel involved in the management of the fund. The Board concluded that it was satisfied with the nature, quality, and extent of the services provided by the Advisor.

Investment Performance of the Fund
The Board reviewed the fund’s average annual total returns over the 1-, 3-, 5-, and 10-year periods, as well as the fund’s year-by-year returns, and compared these returns with a wide variety of previously agreed upon comparable performance measures and market data, including those supplied by Lipper and Morningstar, which are independent providers of mutual fund data. On the basis of this evaluation and the Board’s ongoing review of investment results, and factoring in the relative market conditions during certain of the performance periods, the Board concluded that the fund’s performance was satisfactory.

Costs, Benefits, Profits, and Economies of Scale
The Board reviewed detailed information regarding the revenues received by the Advisor under the Contract and other benefits that the Advisor (and its affiliates) may have realized from its relationship with the fund, including research received under “soft dollar” agreements and commission-sharing arrangements with broker-dealers. The Board considered that the Advisor may receive some benefit from soft-dollar arrangements pursuant to which research is received from broker-dealers that execute the applicable fund’s portfolio transactions. The Board also received information on the estimated costs incurred and profits realized by the Advisor and its affiliates from advising T. Rowe Price mutual funds, as well as estimates of the gross profits realized from managing the fund in particular. The Board concluded that the Advisor’s profits were reasonable in light of the services provided to the fund. The Board also considered whether the fund or other funds benefit under the fee levels set forth in the Contract from any economies of scale realized by the Advisor. Under the Contract, the fund pays a fee to the Advisor composed of two components—a group fee rate based on the aggregate assets of certain T. Rowe Price mutual funds (including the fund) that declines at certain asset levels and an individual fund fee rate that is assessed on the assets of the fund. The Board determined that it would be appropriate to introduce another breakpoint into the group fee rate, effective May 1, 2011, to allow fund shareholders to participate in additional economies of scale. The Board concluded that the advisory fee structure for the fund continued to provide for a reasonable sharing of benefits from any economies of scale with the fund’s investors.

Fees
The Board reviewed the fund’s management fee rate, operating expenses, and total expense ratio and compared them with fees and expenses of other comparable funds based on information and data supplied by Lipper. The information provided to the Board indicated that the fund’s management fee rate was above the median for certain groups of comparable funds but at or below the median for other groups of comparable funds. The information also indicated that the fund’s total expense ratio was above the median for certain groups of comparable funds but below the median for other groups of comparable funds. The Board also reviewed the fee schedules for institutional accounts of the Advisor and its affiliates with similar mandates. Management provided the Board with information about the Advisor’s responsibilities and services provided to institutional account clients, which are more limited than its responsibilities for the fund and other T. Rowe Price mutual funds that it advises, and showing that the Advisor performs significant additional services and assumes greater risk for the fund and other T. Rowe Price mutual funds that it advises than it does for institutional account clients. On the basis of the information provided, the Board concluded that the fees paid by the fund under the Contract were reasonable.

Approval of the Contract
As noted, the Board approved the continuation of the Contract. No single factor was considered in isolation or to be determinative to the decision. Rather, the Board was assisted by the advice of independent legal counsel and concluded, in light of a weighting and balancing of all factors considered, that it was in the best interests of the fund to approve the continuation of the Contract (including the fees to be charged for services thereunder).

ABOUT THE FUND’S TRUSTEES AND OFFICERS

Your fund is overseen by a Board of Trustees (Board) that meets regularly to review a wide variety of matters affecting the fund, including performance, investment programs, compliance matters, advisory fees and expenses, service providers, and other business affairs. The Board elects the fund’s officers, who are listed in the final table. At least 75% of the Board’s members are independent of T. Rowe Price Associates, Inc. (T. Rowe Price), and its affiliates; “inside” or “interested” trustees are employees or officers of T. Rowe Price. The business address of each trustee and officer is 100 East Pratt Street, Baltimore, Maryland 21202. The Statement of Additional Information includes additional information about the fund trustees and is available without charge by calling a T. Rowe Price representative at 1-800-225-5132.

Independent Trustees
Name
(Year of Birth)	Principal Occupation(s) and Directorships of Public Companies and
Year Elected*	Other Investment Companies During the Past Five Years
William R. Brody	President and Trustee, Salk Institute for Biological Studies (2009
(1944)	to present); Director, Novartis, Inc. (2009 to present); Director, IBM
2009	(2007 to present); President and Trustee, Johns Hopkins University
	(1996 to 2009); Chairman of Executive Committee and Trustee,
	Johns Hopkins Health System (1996 to 2009)
Jeremiah E. Casey	Retired
(1940)
2006
Anthony W. Deering	Chairman, Exeter Capital, LLC, a private investment firm (2004
(1945)	to present); Director, Under Armour (2008 to present); Director,
1985	Vornado Real Estate Investment Trust (2004 to present); Director,
	Mercantile Bankshares (2002 to 2007); Member, Advisory Board,
	Deutsche Bank North America (2004 to present)
Donald W. Dick, Jr.	Principal, EuroCapital Partners, LLC, an acquisition and management
(1943)	advisory firm (1995 to present)
2001
Karen N. Horn	Senior Managing Director, Brock Capital Group, an advisory and
(1943)	investment banking firm (2004 to present); Director, Eli Lilly and
2003	Company (1987 to present); Director, Simon Property Group (2004
	to present); Director, Norfolk Southern (2008 to present); Director,
	Fannie Mae (2006 to 2008)
Theo C. Rodgers	President, A&R Development Corporation (1977 to present)
(1941)
2005
John G. Schreiber	Owner/President, Centaur Capital Partners, Inc., a real estate
(1946)	investment company (1991 to present); Cofounder and Partner,
1992	Blackstone Real Estate Advisors, L.P. (1992 to present); Director,
	General Growth Properties, Inc. (2010 to present)
Mark R. Tercek	President and Chief Executive Officer, The Nature Conservancy
(1957)	(2008 to present); Managing Director, The Goldman Sachs Group,
2009	Inc. (1984 to 2008)
*Each independent trustee oversees 129 T. Rowe Price portfolios and serves until retirement,
resignation, or election of a successor.

Inside Trustees
Name
(Year of Birth)
Year Elected*
[Number of T. Rowe Price	Principal Occupation(s) and Directorships of Public Companies and
Portfolios Overseen]	Other Investment Companies During the Past Five Years
Edward C. Bernard	Director and Vice President, T. Rowe Price; Vice Chairman of the
(1956)	Board, Director, and Vice President, T. Rowe Price Group, Inc.;
2006	Chairman of the Board, Director, and President, T. Rowe Price
[129]	Investment Services, Inc.; Chairman of the Board and Director,
	T. Rowe Price Retirement Plan Services, Inc., T. Rowe Price Savings
	Bank, and T. Rowe Price Services, Inc.; Chairman of the Board, Chief
	Executive Officer, and Director, T. Rowe Price International; Chief
	Executive Officer, Chairman of the Board, Director, and President,
	T. Rowe Price Trust Company; Chairman of the Board, all funds
Michael C. Gitlin	Director of Fixed Income, T. Rowe Price (2009 to present); Global
(1970)	Head of Trading, T. Rowe Price (2007 to 2009); Vice President, Price
2010	Hong Kong, Price Singapore, T. Rowe Price, T. Rowe Price Group, Inc.,
[39]	and T. Rowe Price International; formerly Head of U.S. Equity Sales,
	Citigroup Global Markets (2005 to 2007)
*Each inside trustee serves until retirement, resignation, or election of a successor.

Officers
Name (Year of Birth)
Position Held With GNMA Fund	Principal Occupation(s)
Christopher P. Brown (1977)	Vice President, T. Rowe Price
Vice President
Roger L. Fiery III, CPA (1959)	Vice President, Price Hong Kong, Price
Vice President	Singapore, T. Rowe Price, T. Rowe Price Group,
	Inc., T. Rowe Price International, and T. Rowe
	Price Trust Company
John R. Gilner (1961)	Chief Compliance Officer and Vice President,
Chief Compliance Officer	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	Trust Company
Gregory K. Hinkle, CPA (1958)	Vice President, T. Rowe Price, T. Rowe Price
Treasurer	Group, Inc., and T. Rowe Price Trust Company;
	formerly Partner, PricewaterhouseCoopers LLP
	(to 2007)
Keir R. Joyce, CFA (1972)	Vice President, T. Rowe Price and T. Rowe Price
Vice President	Group, Inc.
Alan D. Levenson, Ph.D. (1958)	Vice President, T. Rowe Price and T. Rowe Price
Vice President	Group, Inc.
Patricia B. Lippert (1953)	Assistant Vice President, T. Rowe Price and
Secretary	T. Rowe Price Investment Services, Inc.
Andrew C. McCormick (1960)	Vice President, T. Rowe Price, T. Rowe Price
President	Group, Inc., and T. Rowe Price Trust Company;
	formerly Chief Investment Officer, IMPAC
	Mortgage Holdings (to 2008); Senior Portfolio
	Manager, Avenue Capital Group (to 2006)
David Oestreicher (1967)	Director and Vice President, T. Rowe Price
Vice President	Investment Services, Inc., T. Rowe Price Trust
	Company, and T. Rowe Price Services, Inc.;
	Vice President, Price Hong Kong, Price
	Singapore, T. Rowe Price, T. Rowe Price Group,
	Inc., T. Rowe Price International, and T. Rowe
	Price Retirement Plan Services, Inc.
Deborah D. Seidel (1962)	Vice President, T. Rowe Price, T. Rowe Price
Vice President	Group, Inc., T. Rowe Price Investment Services,
	Inc., and T. Rowe Price Services, Inc.
Julie L. Waples (1970)	Vice President, T. Rowe Price
Vice President
John D. Wells (1960)	Vice President, T. Rowe Price, T. Rowe Price
Vice President	Group, Inc., and T. Rowe Price Savings Bank
Unless otherwise noted, officers have been employees of T. Rowe Price or T. Rowe Price
International for at least 5 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. Anthony W. Deering qualifies as an audit committee financial expert, as defined in Item 3 of Form N-CSR. Mr. Deering 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:

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 and, if applicable, agreed-upon procedures related to fund acquisitions. 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 $1,539,000 and $1,879,000, 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 GNMA Fund
By	/s/ Edward C. Bernard
	Edward C. Bernard
	Principal Executive Officer
Date	July 15, 2011
	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/ Edward C. Bernard
	Edward C. Bernard
	Principal Executive Officer
Date	July 15, 2011
By	/s/ Gregory K. Hinkle
	Gregory K. Hinkle
	Principal Financial Officer
Date	July 15, 2011