Institutional Class	Class P	Administrative Class	Class D
Share Class & Ticker:	PCPIX	PCSPX	N/A	PCSDX

Summary Prospectus May 12, 2010

PIMCO CommoditiesPLUS^™ Short Strategy Fund

Before you invest, you may want to review the Fund’s prospectus, which contains more information about the Fund and its risks. You can find the Fund’s prospectus and other information about the Fund online at www.pimco-funds.com/prospectuses. You can also get this information at no cost by calling 1-866-414-6349 or by sending an email request to Orders@MySummaryProspectus.com. The Fund’s prospectus, dated May 12, 2010, as supplemented, and Statement of Additional Information, dated October 1, 2009, as supplemented, are incorporated by reference into this Summary Prospectus.

INVESTMENT OBJECTIVE

The Fund seeks total return which exceeds that of the inverse return of its benchmark, consistent with prudent investment management.

FEES AND EXPENSES OF THE FUND

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund:

Shareholder Fees (fees paid directly from your investment): None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

	Institutional Class		Class P		Admini strative Class		Class D
Management Fees	0.79	%	0.89	%	0.79	%	1.04	%
Distribution and/or Service (12b-1) Fees	N/A		N/A		0.25	%	0.25	%
Other Expenses(1)	0.06	%	0.06	%	0.06	%	0.06	%
Interest Expense(2)	0.05%		0.05%		0.05%		0.05%
Organizational Expenses	0.01%		0.01%		0.01%		0.01%
Acquired Fund Fees and Expenses(1)	0.09	%	0.09	%	0.09	%	0.09	%
Total Annual Fund Operating Expenses (3)	0.94	%	1.04	%	1.19	%	1.44	%
Fee Waiver and Expense Reimbursement(4)(5)	(0.10	%)	(0.10	%)	(0.10	%)	(0.10	%)
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement(6)	0.84	%	0.94	%	1.09	%	1.34	%

(1) Estimated amounts for the current fiscal year.

(2) Interest expense results from the Fund’s use of certain investments such as reverse repurchase agreements. Such expense is required to be treated as a Fund expense for accounting purposes and is not payable to PIMCO. Any interest expense amount will vary based on the Fund’s use of those investments as an investment strategy best suited to seek the objective of the Fund.

(3) Total Annual Fund Operating Expenses excluding interest expense is 0.89%, 0.99%, 1.14% and 1.39% for Institutional Class, Class P, Administrative Class and Class D, respectively.

(4) Pacific Investment Management Company LLC (“PIMCO”) has contractually agreed, through July 31, 2011, to waive its supervisory and administrative fee, or reimburse the Fund, to the extent that organizational expenses and pro rata Trustees’ fees exceed 0.0049% of the Fund’s aver-

age net assets attributable to Institutional Class, Class P, Administrative Class and Class D shares, respectively (the “Expense Limit”). Under the Expense Limitation Agreement, which renews annually for a full year unless terminated by PIMCO upon at least 30 days’ notice prior to the end of the contract term, PIMCO may recoup these waivers and reimbursements in future periods, not exceeding three years, provided organizational expenses and pro rata Trustees’ fees plus such recoupment, do not exceed the Expense Limit.

(5) PIMCO has contractually agreed to waive the Fund’s advisory fee and the supervisory and administrative fee in an amount equal to the management fee and administrative services fee, respectively, paid by the PIMCO Cayman Commodity Fund IV Ltd. (the “Subsidiary”) to PIMCO. The Subsidiary pays PIMCO a management fee and an administrative services fee at the annual rates of 0.49% and 0.20%, respectively, of its net assets. This waiver may not be terminated by PIMCO and will remain in effect for as long as PIMCO’s contract with the Subsidiary is in place.

(6) Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement excluding interest expense is 0.79%, 0.89%, 1.04% and 1.29% for Institutional Class, Class P, Administrative Class and Class D, respectively.

Example. The Example is intended to help you compare the cost of investing in Institutional Class, Class P, Administrative Class or Class D shares of the Fund with the costs of investing in other mutual funds. The Example assumes that you invest $10,000 in the noted class of shares for the time periods indicated, and then redeem all your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, the Example shows what your costs would be based on these assumptions.

	1 Year	3 Years
Institutional Class	$86	$268
Class P	$96	$300
Administrative Class	$111	$347
Class D	$136	$425

Portfolio Turnover. The Fund pays transaction costs when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example tables, affect the Fund’s performance. The Fund has not yet commenced operations. Thus, no portfolio turnover rate is provided for the Fund.

PRINCIPAL INVESTMENT STRATEGIES

The Fund seeks to achieve its investment objective by investing under normal circumstances in short positions with respect to the Dow Jones—UBS Commodity Index Total Return (the “Index”), including commodity-linked derivative instruments backed by an actively

PIMCO CommoditiesPLUS^TM Short Strategy Fund

managed, low volatility portfolio of Fixed Income Instruments, such that the Fund’s net asset value may vary inversely with the value of the Index on a daily basis, subject to certain limitations summarized below. The Fund will generally benefit when the price of the Index is declining. When the Index is rising, the Fund will generally not perform as well. Fixed Income Instruments owned by the Fund may also benefit or detract from the Fund’s net asset value. The Fund is designed for investors seeking to take advantage of declines in the value of the Index, or investors wishing to hedge existing long commodities positions. However, the Fund is not designed or expected to produce returns which replicate the inverse of the performance of the Index due to compounding, PIMCO’s active management, Fund fees and expenses and other factors discussed below. “Fixed Income Instruments” include bonds, debt securities and other similar instruments issued by various U.S. and non-U.S. public- or private-sector entities.

The Fund will maintain short positions through the use of a combination of commodity-linked derivative instruments, including swap agreements, futures, options on futures, commodity index-linked notes and commodity options that provide short exposure to the investment returns of the commodities futures markets. Commodities are assets that have tangible properties, such as oil, metals, and agricultural products. The value of commodity-linked derivative instruments may be affected by overall market movements and other factors affecting the value of a particular industry or commodity, such as weather, disease, embargoes, or political and regulatory developments. While the Fund will, under normal circumstances, invest primarily in Index short positions backed by a portfolio of Fixed Income Instruments, PIMCO may reduce the Fund’s exposure to Index short positions when PIMCO deems it appropriate to do so. Additionally, the Fund may purchase call options on Index futures contracts or on other similar Index derivatives in an effort to limit the total potential decline in the Fund’s net asset value during a market in which prices of commodities positions are rising or expected to rise. Because the Fund invests primarily in short positions, gains and losses in the Fund will primarily be taxable as short-term gains or losses. However, a portion of the gains or losses from certain types of derivatives, including futures contracts in which the Fund may choose to invest, will be taxable as long-term gains or losses.

The Fund will seek to gain short exposure to the commodity futures markets primarily through investments in swap agreements and futures, and through investments in the PIMCO Cayman Commodity Fund IV Ltd., a wholly-owned subsidiary of the Fund organized under the laws of the Cayman Islands (the “Subsidiary”). The Subsidiary is advised by PIMCO, and has the same investment objective as the Fund. As discussed in greater detail elsewhere in the prospectus, the Subsidiary (unlike the Fund) may invest without limitation in commodity-linked swap agreements and other commodity-linked derivative instruments. The derivative instruments in which the Fund and the Subsidiary primarily intend to invest are instruments inversely linked to certain commodity indices and instruments inversely linked to the value of a particular commodity or commodity futures contract, or a subset of commodities or commodity futures contracts. These instruments may specify short exposure to commodity futures with different roll dates, reset dates or contract months than those specified by a particular commodity index. As a result, the commodity-linked derivatives component of the Fund’s portfolio may deviate from the inverse returns of any particular commodity index. The Fund or the Subsidiary may over-weight or under-weight its short exposure to a particular commodity index, or a subset of commodities, such that the Fund has greater or lesser short exposure to that index than the value of the Fund’s net assets, or greater or lesser short exposure to a subset of commodities than is represented by a particular commodity index. Such

deviations will frequently be the result of temporary market fluctuations, and under normal circumstances the Fund will seek to maintain notional short exposure to one or more commodity indices within 5% (plus or minus) of the value of the Fund’s net assets.

The Fund may also invest in leveraged or unleveraged commodity index-linked notes, which are derivative debt instruments with principal and/or coupon payments linked to the inverse performance of commodity indices. These commodity index-linked notes are sometimes referred to as “structured notes” because the terms of these notes may be structured by the issuer and the purchaser of the note. The value of these notes will rise or fall in response to changes in the underlying commodity or related index of investment.

Assets not invested in commodity-linked derivative instruments or the Subsidiary may be invested in Fixed Income Instruments, including derivative Fixed Income Instruments. The Fund is non-diversified, which means that it may invest its assets in a smaller number of issuers than a diversified fund. In addition, the Fund may invest its assets in particular sectors of the commodities futures market.

The average portfolio duration of the fixed income portion of this Fund will vary based on PIMCO’s forecast for interest rates and under normal market conditions is not expected to exceed one year. Duration is a measure of the expected life of a fixed income security that is used to determine the sensitivity of a security’s price to changes in interest rates. The Fund may invest in investment grade securities that are rated at least Baa, including up to 10% of its total assets in securities rated below A, by Moody’s Investors Service, Inc., or equivalently rated by Standard & Poor’s Rating Services or Fitch, Inc., or, if unrated, determined by PIMCO to be of comparable quality. The Fund may invest up to 10% of its total assets in securities denominated in foreign currencies and may invest without limit in U.S. dollar denominated securities of foreign issuers. The Fund will normally limit its foreign currency exposure (from non-U.S. dollar denominated securities or currencies) to 5% of its total assets. The Fund may, without limitation, seek to obtain market exposure to the securities in which it primarily invests by entering into a series of purchase and sale contracts or by using other investment techniques (such as buy back or dollar rolls). The Fund may purchase and sell securities on a when-issued, delayed delivery or forward commitment basis and may engage in short sales.

Although the Fund uses derivatives and other short positions to gain exposures that may vary inversely with the performance of the Index on a daily basis, the Fund as a whole is not designed or expected to produce returns which replicate the inverse of the performance of the Index, and the degree of variation could be substantial, particularly over longer periods. Because the value of the Fund’s derivatives short positions move in the opposite direction from the value of the Index each day, for periods greater than one day, the effect of compounding may result in the performance of these derivatives positions, and the Fund’s performance attributable to those positions, to be either greater than or less than the inverse of the Index performance for such periods, and the extent of the variation could be substantial due to market volatility and other factors. In addition, the combination of income and capital gains or losses derived from the Fixed Income Instruments serving as cover for the Fund’s short positions, coupled with the ability of the Fund to reduce or limit short exposure, as described above, may result in an imperfect inverse correlation between the performance of the Index and the performance of the Fund. It is possible for the Fund to experience a negative return when the Index is declining, and vice versa. Further, there are a number of other reasons why changes in the value of derivatives positions may not correlate exactly (either positively or inversely) with an index or which may otherwise prevent a mutual fund or its positions from achieving such correlation.

PRINCIPAL RISKS

It is possible to lose money on an investment in the Fund. Under certain conditions, generally in a market where the value of commodity-linked derivative instruments are rising and fixed income securities are declining, the Fund may experience substantial losses. The principal risks of investing in the Fund, which could adversely affect its net asset value, yield and total return are:

Interest Rate Risk: the risk that fixed income securities will decline in value because of an increase in interest rates; a fund with a longer average portfolio duration will be more sensitive to changes in interest rates than a fund with a shorter average portfolio duration

Credit Risk: the risk that the Fund could lose money if the issuer or guarantor of a fixed income security, or the counterparty to a derivative contract, is unable or unwilling to meet its financial obligations

Market Risk: the risk that the value of securities owned by the Fund may go up or down, sometimes rapidly or unpredictably, due to factors affecting securities markets generally or particular industries

Issuer Risk: the risk that the value of a security may decline for reasons directly related to the issuer, such as management performance, financial leverage and reduced demand for the issuer’s goods or service

Liquidity Risk: the risk that a particular investment may be difficult to purchase or sell and that the Fund may be unable to sell illiquid securities at an advantageous time or price or achieve its desired level of exposure to a certain sector

Derivatives Risk: the risk of investing in derivative instruments, including correlation, liquidity, interest rate, market, credit and management risks, mispricing or improper valuation. Changes in the value of the derivative may not inversely correlate perfectly with the underlying asset, rate or index, and the Fund could lose more than the principal amount invested

Commodity Risk: the risk that investing in commodity-linked derivative instruments may subject the Fund to greater volatility than investments in traditional securities. The value of commodity-linked derivative instruments may be affected by changes in overall market movements, commodity index volatility, changes in interest rates, or factors affecting a particular industry or commodity, such as drought, floods, weather, livestock disease, embargoes, tariffs and international economic, political and regulatory developments

Mortgage-Related and Other Asset-Backed Risk: the risks of investing in mortgage-related and other asset-backed securities, including interest rate risk, extension risk and prepayment risk

Foreign (non-U.S.) Investment Risk: the risk that investing in foreign (non-U.S.) securities may result in the Fund experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies, due to smaller markets, differing reporting, accounting and auditing standards, and nationalization, expropriation or confiscatory taxation, currency blockage, or political changes or diplomatic developments

Issuer Non-Diversification Risk: the risks of focusing investments in a small number of issuers, industries or foreign currencies, including being more susceptible to risks associated with a single economic, political or regulatory occurrence than a more diversified portfolio might be. Funds that are “non-diversified” may invest a greater percentage of their assets in the securities of a single issuer (such as bonds issued by a particular state) than funds that are “diversified”

Leveraging Risk: the risk that certain transactions of the Fund, such as reverse repurchase agreements, loans of portfolio securities, and the

use of when-issued, delayed delivery or forward commitment transactions, or derivative instruments, may give rise to leverage, causing the Fund to be more volatile than if it had not been leveraged

Management Risk: the risk that the investment techniques and risk analyses applied by PIMCO will produce the desired results and that legislative, regulatory, or tax developments may affect the investment techniques available to PIMCO and the individual portfolio manager in connection with managing the Fund. There is no guarantee that the investment objective of the Fund will be achieved

Tax Risk: the risk that the tax treatment of swap agreements and other derivative instruments, such as commodity-linked derivative instruments, including commodity index-linked notes, swap agreements, commodity options, futures, and options on futures, may be affected by future regulatory or legislative changes that could affect the character, timing and/or amount of the Fund’s taxable income or gains and distributions

Subsidiary Risk: the risk that, by investing in the Subsidiary, the Fund is indirectly exposed to the risks associated with the Subsidiary’s investments. There is no guarantee that the investment objective of the Subsidiary will be achieved

Short Sale Risk: the risk of entering into short sales, including the potential loss of more money than the actual cost of the investment, and the risk that the third party to the short sale may fail to honor its contract terms, causing a loss to the Fund

Please see “Description of Principal Risks” in the Fund’s prospectus for a more detailed description of the risks of investing in the Fund. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

PERFORMANCE INFORMATION

The Fund does not have a full calendar year of performance. Thus, no bar chart or Average Annual Total Returns table is included for the Fund. Once the Fund commences operations, performance will be updated daily and quarterly and may be obtained as follows: daily updates on the net asset value and performance page at http://www.pimco-funds.com/DailyNAV.aspx and quarterly updates at http://www.pimco-funds.com/PerfSummary.aspx.

The Fund’s benchmark index is the Dow Jones-UBS Commodity Index Total Return. The index is an unmanaged index composed of futures contracts on 19 physical commodities. The index is designed to be a highly liquid and diversified benchmark for commodities as an asset class.

INVESTMENT ADVISER/PORTFOLIO MANAGER

PIMCO serves as the investment adviser for the Fund. The Fund’s portfolio is managed by Nicholas J. Johnson. Mr. Johnson is a Senior Vice President of PIMCO and he will manage the Fund as of its inception.

PURCHASE AND SALE OF FUND SHARES

Institutional Class, Class P or Administrative Class shares: The minimum initial investment for Institutional Class, Class P or Administrative Class shares of the Fund is $1 million, except that the minimum initial investment may be modified for certain financial intermediaries that submit trades on behalf of underlying investors.

Class D shares: The minimum initial investment for Class D shares of the Fund is $1,000, except that the minimum initial investment may be modified for certain financial intermediaries that submit trades on behalf of underlying investors. The minimum subsequent investment for Class D shares is $50.

You may sell (redeem) all or part of your Fund shares on any business day. Depending on the elections made on the Client Registration Application, you may sell by:

n Sending a written request by mail to: PIMCO Funds at PIMCO Funds c/o BFDS Midwest 330 W. 9th Street, Kansas City, MO 64105

n Calling us at 1-800-927-4648 and a Shareholder Services associate will assist you

n Sending a fax to our Shareholder Services department at 1-816-421-2861

n Sending an email to pimcoteam@bfdsmidwest.com

TAX INFORMATION

The Fund’s distributions are generally taxable to you as ordinary income, capital gains, or a combination of the two, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or an individual retirement account.

PAYMENTS TO BROKER-DEALERS AND  OTHER FINANCIAL INTERMEDIARIES

If you purchase shares of the Fund through a broker-dealer or other financial intermediary (such as a bank), the Fund and/or its related companies (including PIMCO) may pay the intermediary for the sale of those shares of the Fund and/or related services. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your salesperson to recommend the Fund over another investment. Ask your salesperson or visit your financial intermediary’s Web site for more information.

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