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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: 811-22542

SSGA ACTIVE ETF TRUST

(Exact name of registrant as specified in charter)

One Lincoln Street, Boston, Massachusetts 02111

(Address of principal executive offices) (zip code)

Ryan M. Louvar, Esq.

State Street Bank and Trust Company

One Lincoln Street/CPH0326

Boston, Massachusetts 02111

(Name and address of agent for service)

Copy to:

W. John McGuire, Esq.

Bingham McCutchen LLP

2020 K Street, N.W.

Washington, DC 20006

Registrant’s telephone number, including area code: (866) 787-2257

Date of fiscal year end: June 30

Date of reporting period: December 31, 2012

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Item 1. Reports to Shareholders.

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SSgA Active ETF Trust

Semi-Annual Report December 31, 2012

Precise in a world that isn’t.^SM

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SPDR SSGA MULTI-ASSET REAL RETURN ETF — PERFORMANCE SUMMARY

The following performance chart of the Fund’s total return at net asset value, the total return based on market price and its benchmark index is provided for comparative purposes only and represents the periods noted. The Fund’s per share net asset value (“NAV”) is the value of one share of the Fund and is calculated by dividing the value of total assets less total liabilities by the number of shares outstanding. The NAV return is based on the NAV of the Fund and the market return is based on the market price per share of the Fund. The market price used to calculate the market return is determined by using the midpoint between the highest bid and the lowest offer on the exchange on which the shares of the Fund are listed for trading, as of the time that the Fund’s NAV is calculated. Since shares of the Fund did not trade in the secondary market until one day after the Fund’s inception, for the period from inception to the first day of secondary market trading in shares of the Fund (4/25/12, 4/26/12, respectively), the NAV of the Fund is used as a proxy for the secondary market trading price to calculate market returns. NAV and market returns assume that dividends and capital gain distributions have been reinvested in the Fund at NAV. Market returns do not include brokerage commissions that may be payable on secondary market transactions. If brokerage commissions were included market returns would be lower.

An index is a statistical measure of a specified financial market or sector. An index does not actually hold a portfolio of securities and therefore does not reflect deductions for fees or expenses. In comparison, the Fund’s performance is negatively impacted by these deductions.

Performance quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, so you may have a gain or loss when shares are sold. Current performance may be higher or lower than that quoted. Visit www.spdrs.com for most recent month-end performance. The returns do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on the redemption or sale of Fund shares. The total expense ratio for SPDR SSgA Multi-Asset Real Return ETF as stated in the Fees and Expenses table of the prospectus dated October 31, 2012 is 0.70%.

PERFORMANCE AS OF DECEMBER 31, 2012

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SPDR SSGA MULTI-ASSET REAL RETURN ETF — PERFORMANCE SUMMARY (CONTINUED)

COMPARISON OF CHANGE IN VALUE OF A $10,000 INVESTMENT (BASED ON NET ASSET VALUE)

Past performance is not a guarantee of future results

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SPDR SSGA INCOME ALLOCATION ETF — PERFORMANCE SUMMARY

The following performance chart of the Fund’s total return at net asset value, the total return based on market price and its benchmark index is provided for comparative purposes only and represents the periods noted. The Fund’s per share net asset value (“NAV”) is the value of one share of the Fund and is calculated by dividing the value of total assets less total liabilities by the number of shares outstanding. The NAV return is based on the NAV of the Fund and the market return is based on the market price per share of the Fund. The market price used to calculate the market return is determined by using the midpoint between the highest bid and the lowest offer on the exchange on which the shares of the Fund are listed for trading, as of the time that the Fund’s NAV is calculated. Since shares of the Fund did not trade in the secondary market until one day after the Fund’s inception, for the period from inception to the first day of secondary market trading in shares of the Fund (4/25/12, 4/26/12, respectively), the NAV of the Fund is used as a proxy for the secondary market trading price to calculate market returns. NAV and market returns assume that dividends and capital gain distributions have been reinvested in the Fund at NAV. Market returns do not include brokerage commissions that may be payable on secondary market transactions. If brokerage commissions were included market returns would be lower.

An index is a statistical measure of a specified financial market or sector. An index does not actually hold a portfolio of securities and therefore does not reflect deductions for fees or expenses. In comparison, the Fund’s performance is negatively impacted by these deductions.

Performance quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, so you may have a gain or loss when shares are sold. Current performance may be higher or lower than that quoted. Visit www.spdrs.com for most recent month-end performance. The returns do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on the redemption or sale of Fund shares. The total expense ratio for SPDR SSgA Income Allocation ETF as stated in the Fees and Expenses table of the prospectus dated October 31, 2012 is 0.70%.

PERFORMANCE AS OF DECEMBER 31, 2012

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SPDR SSGA INCOME ALLOCATION ETF — PERFORMANCE SUMMARY (CONTINUED)

COMPARISON OF CHANGE IN VALUE OF A $10,000 INVESTMENT (BASED ON NET ASSET VALUE)

Past performance is not a guarantee of future results

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SPDR SSGA GLOBAL ALLOCATION ETF — PERFORMANCE SUMMARY

The following performance chart of the Fund’s total return at net asset value, the total return based on market price and its benchmark index is provided for comparative purposes only and represents the periods noted. The Fund’s per share net asset value (“NAV”) is the value of one share of the Fund and is calculated by dividing the value of total assets less total liabilities by the number of shares outstanding. The NAV return is based on the NAV of the Fund and the market return is based on the market price per share of the Fund. The market price used to calculate the market return is determined by using the midpoint between the highest bid and the lowest offer on the exchange on which the shares of the Fund are listed for trading, as of the time that the Fund’s NAV is calculated. Since shares of the Fund did not trade in the secondary market until one day after the Fund’s inception, for the period from inception to the first day of secondary market trading in shares of the Fund (4/25/12, 4/26/12, respectively), the NAV of the Fund is used as a proxy for the secondary market trading price to calculate market returns. NAV and market returns assume that dividends and capital gain distributions have been reinvested in the Fund at NAV. Market returns do not include brokerage commissions that may be payable on secondary market transactions. If brokerage commissions were included market returns would be lower.

An index is a statistical measure of a specified financial market or sector. An index does not actually hold a portfolio of securities and therefore does not reflect deductions for fees or expenses. In comparison, the Fund’s performance is negatively impacted by these deductions.

Performance quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, so you may have a gain or loss when shares are sold. Current performance may be higher or lower than that quoted. Visit www.spdrs.com for most recent month-end performance. The returns do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or on the redemption or sale of Fund shares. The total expense ratio for SPDR SSgA Global Allocation ETF as stated in the Fees and Expenses table of the prospectus dated October 31, 2012 is 0.35%.

PERFORMANCE AS OF DECEMBER 31, 2012

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SPDR SSGA GLOBAL ALLOCATION ETF — PERFORMANCE SUMMARY (CONTINUED)

COMPARISON OF CHANGE IN VALUE OF A $10,000 INVESTMENT (BASED ON NET ASSET VALUE)

Past performance is not a guarantee of future results

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SSgA ACTIVE ETF TRUST

STATEMENTS OF ASSETS AND LIABILITIES

December 31, 2012 (Unaudited)

See Notes to Financial Statements and Financial Statements of the Master Portfolios.

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SSgA ACTIVE ETF TRUST

STATEMENTS OF OPERATIONS

For the Six Months Ended December 31, 2012 (Unaudited)

See Notes to Financial Statements and Financial Statements of the Master Portfolios.

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SSgA ACTIVE ETF TRUST

STATEMENTS OF CHANGES IN NET ASSETS

See Notes to Financial Statements and Financial Statements of the Master Portfolios.

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SSgA ACTIVE ETF TRUST

FINANCIAL HIGHLIGHTS

Selected data for a share of beneficial interest outstanding throughout each period is presented below (1):

See Notes to Financial Statements and Financial Statements of the Master Portfolios.

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SSgA ACTIVE ETF TRUST

NOTES TO FINANCIAL STATEMENTS

December 31, 2012 (Unaudited)

SSgA Active ETF Trust (the “Trust”), which is registered under the Investment Company Act of 1940, as amended (“1940 Act”), is an open-end investment management company that was organized as a Massachusetts business trust on March 30, 2011.

As of December 31, 2012, the Trust offered three (3) portfolios, each of which represents a separate series of beneficial interest in the Trust (each referred to as a “Fund”, collectively as the “Funds”). The financial statements herein relate to the following three (3) Funds: SPDR SSgA Multi-Asset Real Return ETF, SPDR SSgA Income Allocation ETF and SPDR SSgA Global Allocation ETF.

The Trust is part of a master-feeder structure and each Fund invests substantially all of its assets in interests of its respective master portfolio; the SSgA Multi-Asset Real Return Portfolio, SSgA Income Allocation Portfolio and SSgA Global Allocation Portfolio (each referred to as a “Portfolio”; collectively as “Portfolios”), each of which is a series of a separately registered investment company called SSgA Master Trust (“Master Trust”). The investment objective and policies of each Fund are substantially similar to those of its respective Portfolio. The value of each Fund’s investment in its respective Portfolio reflects the Fund’s proportionate interest in the net assets of that Portfolio (99.99% for SPDR SSgA Multi-Asset Real Return ETF, 99.99% for SPDR SSgA Income Allocation ETF and 99.99% for SPDR SSgA Global Allocation ETF, at December 31, 2012). The performance of each Fund is directly affected by the performance of its respective Portfolio. The financial statements of the Portfolios, including their Schedules of Investments, are attached to this report and should be read in conjunction with the Funds’ financial statements.

Under the Trust’s organizational documents, its officers and trustees are indemnified against certain liabilities arising out of the performance of their duties to the Trust. Additionally, in the normal course of business, the Trust enters into contracts with service providers that contain general indemnification clauses. The Trust’s maximum exposure under these arrangements is unknown as this could involve future claims that may be made against the Trust that have not yet occurred. However, based on experience, the Trust expects the risk of loss to be remote.

The following is a summary of significant accounting policies followed by the Trust in the preparation of its financial statements:

The preparation of financial statements in accordance with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts and disclosures in the financial statements. Actual results could differ from those estimates. These financial statements are presented in United States dollars.

Security Valuation

Each Fund records its investments in its respective Portfolio at value each business day. The valuation policies of the Portfolios are discussed in Note 2 of the Portfolios’ Notes to Financial Statements, which are attached to this report.

The Portfolios adopted provisions surrounding fair value measurements and disclosures that define fair value, establish a framework for measuring fair value in generally accepted accounting principles and expand disclosures about fair value measurements. This applies to fair value measurements that are already required or permitted by other accounting standards and is intended to increase consistency of those measurements and applies broadly to securities and other types of assets and liabilities. The summary of the inputs used for each Portfolio, as of December 31, 2012, in valuing each Portfolio’s securities carried at fair value are discussed in Note 2 of the Portfolio’s Notes to Financial Statements, which are attached to this report.

Investment Income

Net investment income consists of a Fund’s pro-rata share of the net investment income of its respective Portfolio, less expenses of the Fund.

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SSgA ACTIVE ETF TRUST

NOTES TO FINANCIAL STATEMENTS (continued)

December 31, 2012 (Unaudited)

Advisory fees and other expenses, which are directly identifiable to a specific Fund, are applied to that Fund. Trustees’ fees and other expenses which cannot be attributed to a specific Fund are allocated in such a manner as deemed equitable, taking into consideration the nature and type of expense and the relative net assets of the Funds.

Equalization

The Funds follow the accounting practice known as “Equalization” by which a portion of the proceeds from sales and costs of reacquiring Fund shares, equivalent on a per share basis to the amount of distributable net investment income on the date of the transaction, is credited or charged to undistributed net investment income. As a result, undistributed net investment income per share is unaffected by sales or reacquisition of Fund shares. Amounts related to Equalization can be found on the Statements of Changes in Net Assets.

Investment Transactions

Investment transactions are recorded as of the trade date. Realized gains and losses from security transactions consist of the Fund’s pro-rata share of its respective Portfolio’s realized gains and losses. Realized gains and losses from security transactions are recorded on the identified cost basis. Corporate actions (including cash dividends) are recorded net of foreign tax withholdings on the ex-dividend date.

Federal Income Tax

The Funds have qualified and intend to continue to qualify for and elect treatment as “regulated investment companies” under Subchapter M of the Internal Revenue Code of 1986, as amended. By so qualifying and electing, each Fund will not be subject to federal income taxes to the extent it distributes its taxable income, including any net realized capital gains, for each fiscal year. In addition, by distributing during each calendar year substantially all of their net investment income and capital gains, if any, the Funds will not be subject to federal excise tax. Income and capital gain distributions are determined in accordance with income tax regulations which may differ from U.S. generally accepted accounting principles. These book-tax differences are primarily due to differing treatments for in-kind transactions for financial statement purposes and losses deferred due to wash sales.

Additionally, based on the Funds’ understanding of the tax rules and rates related to income, gains and transactions for the foreign jurisdictions in which the applicable Funds invest, the Funds will provide for foreign taxes and, where appropriate, deferred foreign taxes. The Funds have reviewed the tax positions for the open tax years as of June 30, 2012 and have determined that no provision for income tax is required in the Funds’ Financial Statements. The Funds’ federal tax returns are subject to examination by the Funds’ major tax jurisdictions, which include the United States of America and the Commonwealth of Massachusetts. The Funds recognized interest and penalties, if any, related to tax liabilities as income tax expense in the Statements of Operations.

For the period ended December 31, 2012, the following Funds reclassified non-taxable security gains and losses realized on the in-kind redemption of Creation Units (Note 4) as an increase or decrease to paid in capital in the Statements of Assets and Liabilities as follows:

At June 30, 2012, the Funds had capital loss carryforwards which may be utilized to offset any net short term realized capital gains. These losses will not expire and are treated as though the losses were incurred on the first day of the next fiscal year:

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SSgA ACTIVE ETF TRUST

NOTES TO FINANCIAL STATEMENTS (continued)

December 31, 2012 (Unaudited)

Distributions

Each Fund declares and distributes dividends from net investment income, if any, to its shareholders quarterly. Each Fund declares and distributes net realized capital gains, if any, at least annually. Distributions are recorded on the ex-dividend date. Income and capital gain distributions are determined in accordance with income tax regulations, which may differ from U.S. generally accepted accounting principles.

Advisory Fee

Each Fund has entered into an Investment Advisory Agreement with SSgA Funds Management, Inc. (the “Adviser” or “SSgA FM”). As compensation for the services rendered, facilities furnished, and expenses borne by the Adviser, each Fund pays the Adviser a fee accrued daily and paid monthly, based on a percentage of each Fund’s average daily net assets as shown in the following table:

The Adviser pays all operating expenses of each Fund other than management fee, distribution fee pursuant to each Fund’s Distribution and Service Plan, if any, brokerage, taxes, interest, fees and expenses of the Independent Trustees (including any Trustees’ counsel fees), litigation expenses, and other extraordinary expenses.

State Street Bank and Trust Company (“State Street”), an affiliate of the Adviser, receives fees for its services as Custodian, Administrator and Transfer Agent from the Adviser.

State Street Global Markets, LLC (the “Distributor”), an affiliate of the Adviser, serves as the distributor of the shares of each Fund. Pursuant to a Distribution and Service Plan adopted in accordance with Rule 12b-1 under the 1940 Act, each Fund is authorized to pay an amount of up to 0.25% of its average daily net assets for certain distribution-related activities. However, the Board of Trustees has determined that no such payments will be made through at least October 31, 2013 and therefore no such payments have been made.

The Distributor has established an assisted trading program to aid Authorized Participants in certain creation and redemption activity for which the Distributor receives commissions from Authorized Participants. In addition, the Distributor receives compensation from State Street associated with on-line creation and redemption activity of Authorized Participants.

Trustees’ Fees

The Trust, SSgA Master Trust, SPDR Series Trust and SPDR Index Shares Funds pay, in the aggregate, each Independent Trustee an annual fee of $150,000 plus $10,000 per in-person meeting attended and $1,250 for each telephonic or video conference meeting attended. The Chairman of the Board receives an additional annual fee of $50,000 and the Chairman of the Audit Committee receives an additional annual fee of $20,000. The Trust also reimburses each Independent Trustee for travel and other out-of-pocket expenses incurred by him/her in connection with attending such meetings and in connection with attending industry seminars and meetings. Trustee fees are allocated among the Trusts and each of their respective series in such a manner as deemed equitable, taking into consideration the relative net assets of the series.

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NOTES TO FINANCIAL STATEMENTS (continued)

December 31, 2012 (Unaudited)

Shares are issued and redeemed by a Fund only in Creation Unit size aggregations of 50,000 shares. Such transactions are generally permitted on an in-kind basis, with a separate cash payment, which is a balancing cash component to equate the transaction to the net asset value per unit of the Fund on the transaction date. Transaction fees ranging from $100 to $400 per Creation Unit for each Fund, regardless of the number of Creation Units that are created or redeemed on the same day, are charged to those persons creating or redeeming Creation Units. An additional variable fee may be charged for certain transactions. Transaction fees are received by the Trust and/or Custodian and are used to defray related expenses. The Custodian also receives amounts earned on cash collateral provided by Authorized Participants pending delivery of missing deposit securities.

In December 2011, FASB issued ASU No. 2011-11 “Disclosures about Offsetting Assets and Liabilities.” These common disclosure requirements are intended to help investors and other financial statement users to better assess the effect or potential effect of offsetting arrangements on a portfolio’s financial position. They also improve transparency in the reporting of how companies mitigate credit risk, including disclosure of related collateral pledged or received. In addition, ASU 2011-11 facilitates comparison between those entities that prepare their financial statements on the basis of U.S. GAAP and those entities that prepare their financial statements on the basis of International Financial Reporting Standards. ASU 2011-11 requires entities to disclose both gross and net information about both instruments and transactions eligible for offset in the financial position; and disclose instruments and transactions subject to an agreement similar to a master netting agreement. ASU 2011-11 is effective for fiscal years beginning on or after January 1, 2013, and interim periods within those annual periods. Management is currently evaluating the implications of ASU 2011-11 and its impact on financial statement disclosures.

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SSgA ACTIVE ETF TRUST

OTHER INFORMATION

December 31, 2012 (Unaudited)

Shareholder Expense Example

As a shareholder of a Fund, you incur two types of costs: (1) transaction costs, which may include creation and redemption fees or brokerage charges and (2) ongoing costs, including management fees, trustee fees, and other Fund expenses. This Example is intended to help you understand your ongoing costs (in dollars) of investing in a Fund and to compare these costs with the ongoing costs of investing in other funds. It is based on an investment of $1,000 invested on July 1, 2012 and held for the six months ended December 31, 2012.

Actual Expenses

The first table below provides information about actual account values and actual expenses. You may use the information in this table, together with the amount you invested, to estimate the expenses that you incurred 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 table under the heading entitled “Expenses Paid During Period” to estimate the expenses attributable to your investment during this period.

Hypothetical Example for Comparison Purposes

The second table below provides information about hypothetical account values and hypothetical expenses based on a Fund’s actual expense ratio and an assumed rate of return of 5% per year before expenses, which is not a Fund’s actual return. Thus, you should not use the hypothetical account values and expenses to estimate the actual ending account balance or your expenses for the period. Rather, these figures are provided to enable you to compare the ongoing costs of investing in a Fund and other funds. To do so, compare this 5% hypothetical example with the 5% hypothetical examples that appear in the shareholder reports of the other funds. The Funds charge transaction fees at scheduled amounts ranging from $100 to $400 per Creation Unit to those persons creating or redeeming Creation Units. If you buy or sell the Funds’ shares in the secondary market, you will incur customary brokerage commissions and charges.

Please note that the expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any transaction costs, such as creation and redemption fees, or brokerage charges. Therefore, the second table is useful in comparing ongoing costs only, and will not help you determine the relative total costs of owning different funds. In addition, if these transaction costs were included, your costs would have been higher.

Premium/Discount Information

Information regarding how often the Shares of each Fund traded on the Exchange at a price above (i.e. at a premium) or below (i.e. at a discount) the net asset value of the Fund for the past calendar year can be found on the Funds’ website at www.spdrs.com.

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SSgA ACTIVE ETF TRUST

OTHER INFORMATION (continued)

December 31, 2012 (Unaudited)

Proxy Voting Policies and Procedures and Records

A description of the Trust’s proxy voting policies and procedures that are used by the Funds’ investment adviser to vote proxies relating to the Funds’ portfolio of securities are available (i) without charge, upon request by calling 1-866-787-2257 (toll free) or (ii) on the website of the Securities and Exchange Commission, at www.sec.gov. Information regarding how the investment advisor voted for the prior 12-months period ended June 30 is available by August 31 of each year by calling the same number and on the SEC’s website, at www.sec.gov, and on the Funds’ website at www.spdrs.com.

Quarterly Portfolio Schedule

The Funds file a complete schedule of portfolio holdings with the SEC for the first and third quarters of each fiscal year on Form N-Q. The Fund’s Forms N-Q are available on the SEC’s website at www.sec.gov and may be reviewed and copied at the SEC’s Public Reference Room in Washington DC. Information on the operation of the Public Reference Room may be obtained by calling 1-800-SEC-0330. The information on the Form N-Q is available upon request, without charge, by calling 1-866-787-2257 (toll free) and on the Funds’ website at www.spdrs.com.

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The SPDR^® Family of Exchange Traded Funds

The following is a list of SPDR ETFs being offered, along with their respective exchange trading symbols. Please call 1-866-787-2257 to obtain a prospectus for any SPDR ETF. The prospectus contains more complete information, including charges, expenses, investment objectives and risk factors that should be carefully considered to determine if the Fund(s) are an appropriate investment for you. Read the prospectus(es) carefully before investing. Investing involves risk, including possible loss of principal.

SPDR Series Trust

SPDR Dow Jones Total Market ETF (TMW)

SPDR Dow Jones Large Cap ETF (ELR)

SPDR S&P 500 Growth ETF (SPYG)

SPDR S&P 500 Value ETF (SPYV)

SPDR Dow Jones Mid Cap ETF (EMM)

SPDR S&P 400 Mid Cap Growth ETF (MDYG)

SPDR S&P 400 Mid Cap Value ETF (MDYV)

SPDR S&P 600 Small Cap ETF (SLY)

SPDR S&P 600 Small Cap Growth ETF (SLYG)

SPDR S&P 600 Small Cap Value ETF (SLYV)

SPDR Global Dow ETF (DGT)

SPDR Dow Jones REIT ETF (RWR)

SPDR S&P Bank ETF (KBE)

SPDR S&P Capital Markets ETF (KCE)

SPDR S&P Insurance ETF (KIE)

SPDR S&P Mortgage Finance ETF (KME)

SPDR S&P Regional Banking ETF (KRE)

SPDR Morgan Stanley Technology ETF (MTK)

SPDR S&P Dividend ETF (SDY)

SPDR S&P Aerospace & Defense ETF (XAR)

SPDR S&P Biotech ETF (XBI)

SPDR S&P Health Care Equipment ETF (XHE)

SPDR S&P Health Care Services ETF (XHS)

SPDR S&P Homebuilders ETF (XHB)

SPDR S&P Metals & Mining ETF (XME)

SPDR S&P Oil & Gas Equipment & Services ETF (XES)

SPDR S&P Oil & Gas Exploration & Production ETF (XOP)

SPDR S&P Pharmaceuticals ETF (XPH)

SPDR S&P Retail ETF (XRT)

SPDR S&P Semiconductor ETF (XSD)

SPDR S&P Software & Services ETF (XSW)

SPDR S&P Telecom ETF (XTL)

SPDR S&P Transportation ETF (XTN)

SPDR S&P 1500 Value Tilt ETF (VLU)

SPDR S&P 1500 Momentum Tilt ETF (MMTM)

SPDR Russell 1000 Low Volatility ETF (LGLV)

SPDR Russell 2000 Low Volatility ETF (SMLV)

SPDR Wells Fargo Preferred Stock ETF (PSK)

SPDR Barclays 1-3 Month T-Bill ETF (BIL)

SPDR Barclays TIPS ETF (IPE)

SPDR Barclays Short Term Treasury ETF (SST)

SPDR Barclays Intermediate Term Treasury ETF (ITE)

SPDR Barclays Long Term Treasury ETF (TLO)

SPDR Barclays Short Term Corporate Bond ETF (SCPB)

SPDR Barclays Intermediate Term Corporate Bond ETF (ITR)

SPDR Barclays Long Term Corporate Bond ETF (LWC)

SPDR Barclays Issuer Scored Corporate Bond ETF (CBND)

SPDR Barclays Convertible Securities ETF (CWB)

SPDR Barclays Mortgage Backed Bond ETF (MBG)

SPDR Barclays Aggregate Bond ETF (LAG)

SPDR Nuveen Barclays Capital Municipal Bond ETF (TFI)

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SPDR Nuveen Barclays California Municipal Bond ETF (CXA)

SPDR Nuveen Barclays New York Municipal Bond ETF (INY)

SPDR Nuveen Barclays Short Term Municipal Bond ETF (SHM)

SPDR Nuveen S&P VRDO Municipal Bond ETF (VRD)

SPDR Nuveen S&P High Yield Municipal Bond ETF (HYMB)

SPDR Nuveen Barclays Build America Bond ETF (BABS)

SPDR DB International Government Inflation-Protected Bond ETF (WIP)

SPDR Barclays Short Term International Treasury Bond ETF (BWZ)

SPDR Barclays International Treasury Bond ETF (BWX)

SPDR Barclays International Corporate Bond ETF (IBND)

SPDR Barclays Emerging Markets Local Bond ETF (EBND)

SPDR Barclays High Yield Bond ETF (JNK)

SPDR Barclays Short Term High Yield Bond ETF (SJNK)

SPDR Barclays Investment Grade Floating Rate ETF (FLRN)

SPDR BofA Merrill Lynch Emerging Markets Corporate Bond ETF (EMCD)

SPDR BofA Merrill Lynch Crossover Corporate Bond ETF (XOVR)

SPDR Index Shares Funds

SPDR STOXX Europe 50 ETF (FEU)

SPDR EURO STOXX 50 ETF (FEZ)

SPDR S&P Emerging Asia Pacific ETF (GMF)

SPDR S&P Small Cap Emerging Asia Pacific ETF (GMFS)

SPDR S&P Russia ETF (RBL)

SPDR S&P China ETF (GXC)

SPDR S&P Emerging Markets ETF (GMM)

SPDR S&P Emerging Markets Dividend ETF (EDIV)

SPDR S&P BRIC 40 ETF (BIK)

SPDR S&P Emerging Europe ETF (GUR)

SPDR S&P Emerging Latin America ETF (GML)

SPDR S&P Emerging Middle East & Africa ETF (GAF)

SPDR S&P World ex-US ETF (GWL)

SPDR S&P International Small Cap ETF (GWX)

SPDR Dow Jones International Real Estate ETF (RWX)

SPDR FTSE/Macquarie Global Infrastructure 100 ETF (GII)

SPDR S&P Global Natural Resources ETF (GNR)

SPDR MSCI ACWI ex-US ETF (CWI)

SPDR MSCI ACWI IMI ETF (ACIM)

SPDR MSCI EM 50 ETF (EMFT)

SPDR Russell/Nomura PRIME Japan ETF (JPP)

SPDR Russell/Nomura Small Cap Japan ETF (JSC)

SPDR S&P International Dividend ETF (DWX)

SPDR S&P International Mid Cap ETF (MDD)

SPDR S&P Emerging Markets Small Cap ETF (EWX)

SPDR Dow Jones Global Real Estate ETF (RWO)

SPDR S&P International Consumer Discretionary Sector ETF (IPD)

SPDR S&P International Consumer Staples Sector ETF (IPS)

SPDR S&P International Energy Sector ETF (IPW)

SPDR S&P International Financial Sector ETF (IPF)

SPDR S&P International Health Care Sector ETF (IRY)

SPDR S&P International Industrial Sector ETF (IPN)

SPDR S&P International Materials Sector ETF (IRV)

SPDR S&P International Technology Sector ETF (IPK)

SPDR S&P International Telecommunications Sector ETF (IST)

SPDR S&P International Utilities Sector ETF (IPU)

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The Select Sectors SPDR Trust

The Consumer Discretionary Select Sector SPDR Fund (XLY)

The Consumer Staples Select Sector SPDR Fund (XLP)

The Energy Select Sector SPDR Fund (XLE)

The Financial Select Sector SPDR Fund (XLF)

The Health Care Select Sector SPDR Fund (XLV)

The Industrial Select Sector SPDR Fund (XLI)

The Materials Select Sector SPDR Fund (XLB)

The Technology Select Sector SPDR Fund (XLK)

The Utilities Select Sector SPDR Fund (XLU)

SSgA Active ETF Trust

SPDR SSgA Multi-Asset Real Return ETF (RLY)

SPDR SSgA Income Allocation ETF (INKM)

SPDR SSgA Global Allocation ETF (GAL)

SPDR Dow Jones Industrial Average ETF Trust (DIA)

SPDR S&P 500 ETF Trust (SPY)

State Street Global Markets, LLC, member FINRA, SIPC, is distributor for all investment portfolios of SPDR Series Trust, SPDR Index Shares Funds, and SSgA Active ETF Trust. ALPS Distributors, Inc., a registered broker-dealer, is distributor for SPDR S&P 500 ETF Trust (SPY) and SPDR Dow Jones Industrial Average ETF Trust (DIA), both unit investment trusts, and all investment portfolios of The Select Sector SPDR Trust.

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SSgA Active ETF Trust

TRUSTEES

Bonny E. Boatman

Dwight D. Churchill

David M. Kelly

Frank Nesvet, Chairman

James E. Ross

Carl G. Verboncoeur

OFFICERS

Ellen M. Needham, President

Michael P. Riley, Vice President

Chad C. Hallett, Treasurer

Matthew W. Flaherty, Assistant Treasurer

Laura F. Dell, Assistant Treasurer

Ryan M. Louvar, Secretary

Mark E. Tuttle, Assistant Secretary

Scott E. Habeeb, Assistant Secretary

Jacqueline Angell, Chief Compliance Officer

INVESTMENT MANAGER

SSgA Funds Management, Inc.

State Street Financial Center

One Lincoln Street

Boston, MA 02111

DISTRIBUTOR

State Street Global Markets, LLC

One Lincoln Street

Boston, MA 02111

CUSTODIAN, ADMINISTRATOR AND TRANSFER AGENT

State Street Bank and Trust Company

One Lincoln Street

Boston, MA 02111

LEGAL COUNSEL

Bingham McCutchen LLP

2020 K Street, NW

Washington, DC 20006

INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

Ernst & Young LLP

200 Clarendon Street

Boston, MA 02116

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SSgA Master Trust

Semi-Annual Report December 31, 2012

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SSGA MULTI-ASSET REAL RETURN PORTFOLIO — PORTFOLIO SUMMARY

TOP FIVE HOLDINGS AS OF DECEMBER 31, 2012

(The five largest holdings are subject to change, and there are no guarantees the Portfolio will continue to remain invested in a particular Fund.)

ASSET ALLOCATION AS OF DECEMBER 31, 2012*

1

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SSGA INCOME ALLOCATION PORTFOLIO — PORTFOLIO SUMMARY

TOP FIVE HOLDINGS AS OF DECEMBER 31, 2012

(The five largest holdings are subject to change, and there are no guarantees the Portfolio will continue to remain invested in a particular Fund.)

ASSET ALLOCATION AS OF DECEMBER 31, 2012*

2

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SSGA GLOBAL ALLOCATION PORTFOLIO — PORTFOLIO SUMMARY

TOP FIVE HOLDINGS AS OF DECEMBER 31, 2012