Type N-30D SPDR DOW JONES INDUSTRIA For: Apr 30

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Table of Contents

Semi-Annual Report

April 30, 2021

SPDR® Dow Jones Industrial AverageSM ETF Trust

A Unit Investment Trust

“Dow Jones Industrial AverageSM”,
“DJIA®”, “Dow Jones®”, “The Dow®” and
“DIAMONDS®” are trademarks and service marks of Standard & Poor’s Financial Services LLC and have
been licensed for use by S&P Dow Jones Indices LLC (“S&P”) and sublicensed for use by State Street Global Advisors Funds Distributors, LLC. SPDR Dow Jones Industrial Average ETF Trust (the “Trust”), PDR Services LLC and
NYSE Arca, Inc. are permitted to use these trademarks and service marks pursuant to separate sublicenses. The Trust is not sponsored, endorsed, sold or promoted by S&P, its affiliates or its third party licensors.

“SPDR®” is
a trademark of Standard & Poor’s Financial Services LLC and has been licensed for use by S&P and sublicensed for use by State Street Global Advisors Funds Distributors, LLC. No financial product offered by State Street Global
Advisors Funds Distributors, LLC or its affiliates is sponsored, endorsed, sold or promoted by S&P, its affiliates or its third party licensors.

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SPDR Dow Jones Industrial Average ETF Trust

Semi-Annual Report

April 30,
2021

(Unaudited)

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SPDR Dow Jones Industrial Average ETF Trust

Schedule of Investments

April 30, 2021 (Unaudited)

See accompanying notes to financial statements.

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SPDR Dow Jones Industrial Average ETF Trust

Schedule of Investments (continued)

April 30, 2021 (Unaudited)

The following table summarizes the value of the Trust’s investments according to the fair value hierarchy as
of April 30, 2021.

See accompanying notes to financial statements.

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SPDR Dow Jones Industrial Average ETF Trust

Portfolio Statistics (Unaudited)

April 30, 2021

INDUSTRY BREAKDOWN AS OF APRIL 30, 2021*

See accompanying notes to financial statements.

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SPDR Dow Jones Industrial Average ETF Trust

Statement of Assets And Liabilities

April 30, 2021 (Unaudited)

See accompanying notes to financial statements.

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SPDR Dow Jones Industrial Average ETF Trust

Statements of Operations

See accompanying notes to financial statements.

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SPDR Dow Jones Industrial Average ETF Trust

Statements of Changes in Net Assets

See accompanying notes to financial statements.

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SPDR Dow Jones Industrial Average ETF Trust

Financial Highlights

Selected data for a Unit outstanding throughout each period

See accompanying notes to
financial statements.

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SPDR Dow Jones Industrial Average ETF Trust

Notes to Financial Statements

April 30, 2021 (Unaudited)

Note 1 — Organization

SPDR Dow Jones Industrial Average ETF Trust (the “Trust”) is a unit investment trust created under the laws of the State of New York and registered under the Investment Company Act of 1940, as amended.
The Trust is an “Exchange-Traded Fund”, the units of which are listed on and traded on the New York Stock Exchange under the symbol “DIA”, and operates under an exemptive order granted by the U.S. Securities and Exchange
Commission (the “SEC”). The Trust was created to provide investors with the opportunity to purchase a security representing a proportionate undivided interest in a portfolio of securities consisting of substantially all of the component
common stocks, in substantially the same weighting, which comprise the Dow Jones Industrial Average (the “DJIA”). Each unit of fractional undivided interest in the Trust is referred to as a “Unit.” The Trust commenced operations
on January 14, 1998 upon the initial issuance of 500,000 Units (equivalent to ten “Creation Units” — see Note 4) in exchange for a portfolio of securities assembled to reflect the intended portfolio composition of the Trust.

Effective June 16, 2017, State Street Bank and Trust Company (“SSBT”) resigned as trustee of the Trust. PDR Services, LLC, as sponsor of
the Trust (the “Sponsor”), appointed State Street Global Advisors Trust Company, a wholly-owned subsidiary of SSBT, as trustee of the Trust (the “Trustee”).

The services received, and the trustee fees paid, by the Trust have not changed as a result of the change in the identity of the Trustee. SSBT continues to maintain the Trust’s accounting records, act as
custodian and transfer agent to the Trust, and provide administrative services, including the filing of certain regulatory reports.

Under the Amended
and Restated Standard Terms and Conditions of the Trust, as amended (the “Trust Agreement”), the Sponsor and the Trustee 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 that contain general indemnification clauses. The Trust’s maximum exposure under these arrangements is unknown as this would involve future claims that may be made against the
Trust that have not yet occurred. However, based on experience, the Trustee expects the risk of material loss to be remote.

The Sponsor is an indirect,
wholly-owned subsidiary of Intercontinental Exchange, Inc. (“ICE”). ICE is a publicly-traded entity, trading on the New York Stock Exchange under the symbol “ICE.”

Note 2 — Summary of Significant Accounting Policies

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

The preparation of financial statements in accordance
with U.S. generally accepted accounting principles (“U.S. GAAP”) requires the Trustee to make estimates and assumptions that affect the

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SPDR Dow Jones Industrial Average ETF Trust

Notes to Financial Statements — (continued)

April 30, 2021 (Unaudited)

Note 2 — Summary of Significant Accounting Policies – (continued)

reported amounts and disclosures in the financial statements. Actual results could differ from those estimates. The Trust is an investment company under U.S. GAAP and follows the accounting and
reporting guidance applicable to investment companies.

Security Valuation

The Trust’s investments are valued at fair value each day that the New York Stock Exchange (“NYSE”) is open and, for financial reporting purposes, as of the report date should the reporting period
end on a day that the NYSE is not open. Fair value is generally defined as the price a fund would receive to sell an asset or pay to transfer a liability in an orderly transaction between market participants at the measurement date. By its nature, a
fair value price is a good faith estimate of the valuation in a current sale and may not reflect an actual market price. The investments of the Trust are valued pursuant to the policy and procedures developed by the Oversight Committee of the
Trustee (the “Committee”). The Committee provides oversight of the valuation of investments for the Trust.

Valuation techniques used to value
the Trust’s equity investments are as follows:

Equity investments (including preferred stocks) traded on a recognized securities exchange for
which market quotations are readily available are valued at the last sale price or official closing price, as applicable, on the primary market or exchange on which they trade. Equity investments traded on a recognized exchange for which there were
no sales on that day are valued at the last published sale price or at fair value.

In the event that prices or quotations are not readily available or
that the application of these valuation methods results in a price for an investment that is deemed to be not representative of the fair value of such investment, fair value will be determined in good faith by the Committee, in accordance with the
valuation policy and procedures approved by the Trustee.

Fair value pricing could result in a difference between the prices used to calculate the
Trust’s net asset value (“NAV”) and the prices used by the Trust’s underlying index, the DJIA, which in turn could result in a difference between the Trust’s performance and the performance of the DJIA.

The Trustee values the Trust’s assets and liabilities at fair value using a hierarchy that prioritizes the inputs to valuation techniques, giving the highest
priority to readily available unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements) when market prices are not readily available or
reliable. The categorization of a value determined for an investment within the hierarchy is based upon the pricing transparency of the investment and is not necessarily an indication of the risk associated with the investment.

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SPDR Dow Jones Industrial Average ETF Trust

Notes to Financial Statements — (continued)

April 30, 2021 (Unaudited)

Note 2 — Summary of Significant Accounting Policies – (continued)

The three levels of the fair value hierarchy are as follows:

Investment Transactions and Income Recognition

Investment transactions are accounted for on the trade date for financial reporting purposes. Dividend income and capital gain distributions, if any, are recognized on the
ex-dividend date, or when the information becomes available, net of any foreign taxes withheld at source, if any. Non-cash dividends received in the form of stock, if
any, are recorded as dividend income at fair value. Realized gains and losses from the sale or disposition of investments are determined using the identified cost method.

Distributions

The Trust declares and distributes dividends from net investment income, if any, to its holders
of Units (“Unitholders”) monthly. Capital gain distributions, if any, are generally declared and paid annually. Additional distributions may be paid by the Trust to avoid imposition of federal income and excise tax on any remaining
undistributed net investment income and capital gains. The amount and character of income and gains to be distributed are determined in accordance with federal tax regulations which may differ from net investment income and realized gains recognized
for U.S. GAAP purposes.

Equalization

The
Trustee follows the accounting practice known as “Equalization” by which a portion of the proceeds from sales and costs of reacquiring the Trust’s Units, equivalent on a per Unit 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 Unit is unaffected by sales or reacquisitions of the Trust’s Units. Amounts related to
Equalization can be found on the Statements of Changes in Net Assets.

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SPDR Dow Jones Industrial Average ETF Trust

Notes to Financial Statements — (continued)

April 30, 2021 (Unaudited)

Note 2 — Summary of Significant Accounting Policies – (continued)

Federal Income Taxes

For U.S. federal income tax purposes, the Trust has qualified as a “regulated investment company” under Subchapter M of the Internal Revenue Code of 1986, as amended (a “RIC”), and intends to
continue to qualify as a RIC. As a RIC, the Trust will generally not be subject to U.S. federal income tax for any taxable year on income, including net capital gains, that it distributes to its Unitholders, provided that it distributes on a timely
basis at least 90% of its “investment company taxable income” determined prior to the deduction for dividends paid by the Trust (generally, its taxable income other than net capital gain) for such taxable year. In addition, provided that
the Trust distributes substantially all of its ordinary income and capital gains during each calendar year, the Trust will not be subject to U.S. federal excise tax. Income and capital gain distributions are determined in accordance with U.S.
federal income tax principles, which may differ from U.S. GAAP.

U.S. GAAP requires the evaluation of tax positions taken in the course of preparing the
Trust’s tax returns to determine whether the tax positions are more likely than not to be sustained by the applicable tax authority. For U.S. GAAP purposes, the Trust recognizes the tax benefits of uncertain tax positions only when the position
is more likely than not to be sustained, assuming examination by tax authorities.

The Trustee has reviewed the Trust’s tax positions for the open
tax years as of October 31, 2020 and has determined that no provision for income tax is required in the Trust’s financial statements. Generally, the Trust’s tax returns for the prior three fiscal years remain subject to examinations
by the Trust’s major tax jurisdictions, which include the United States of America, the Commonwealth of Massachusetts and the State of New York. The Trustee has the Trust recognize interest and penalties, if any, related to tax liabilities as
income tax expense in the Statements of Operations. There were no such expenses for the year ended October 31, 2020.

No income tax returns are
currently under examination. The Trustee has analyzed the relevant tax laws and regulations and their application to the Trust’s facts and circumstances and does not believe there are any uncertain tax positions that require recognition of any
tax liabilities. Any potential tax liability is also subject to ongoing interpretation of laws by taxing authorities. The tax treatment of the Trust’s investments may change over time based on factors including, but not limited to, new tax
laws, regulations and interpretations thereof.

During the six months ended April 30, 2021, the Trustee reclassified $1,409,474,328 of non-taxable security gains realized from the in-kind redemption of Creation Units (Note 4) as an increase to paid in capital in the Trust’s Statement of Assets and
Liabilities.

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Notes to Financial Statements — (continued)

April 30, 2021 (Unaudited)

Note 2 — Summary of Significant Accounting Policies – (continued)

At April 30, 2021, gross unrealized appreciation and gross unrealized depreciation of investments based on
cost for federal income tax purposes were as follows:

Note 3 — Transactions with Affiliates of the Trustee and Sponsor

SSBT maintains the Trust’s accounting records, acts as custodian and transfer agent to the Trust, and provides administrative services, including the filing
of certain regulatory reports. The Trustee pays SSBT for such services. The Trustee is responsible for determining the composition of the portfolio of securities which must be delivered and/or received in exchange for the issuance and/or redemption
of Creation Units of the Trust, and for adjusting the composition of the Trust’s portfolio from time to time to conform to changes in the composition and/or weighting structure of the DJIA . For these services, the Trustee received a fee at the
following annual rates for the six months ended April 30, 2021:

The adjustment amount (the “Adjustment Amount”) is the sum of (a) the excess or deficiency of transaction fees
received by the Trustee, less the expenses incurred in processing orders for the creation and redemption of Units and (b) the amounts earned by the Trustee with respect to the cash held by the Trustee for the benefit of the Trust.

During the six months ended April 30, 2021, the Adjustment Amount reduced the Trustee’s fee by $323,719. The Adjustment Amount included an excess of net
transaction fees from processing orders of $310,267 and a Trustee earnings credit of $13,452.

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Notes to Financial Statements — (continued)

April 30, 2021 (Unaudited)

Note 3 — Transactions with Affiliates of the Trustee and Sponsor – (continued)

In accordance with the Trust Agreement and under the terms of an exemptive order issued by the SEC, dated
December 30, 1997, the Sponsor is reimbursed by the Trust for certain expenses up to a maximum of 0.20% of the Trust’s NAV on an annualized basis. The expenses reimbursed to the Sponsor for the six months ended April 30, 2021, and the
years ended October 31, 2020, 2019 and 2018, did not exceed 0.20% per annum. The licensing and marketing fee disclosed below are subject to both the reimbursement from the Trust to the Sponsor and expense limitation of 0.20% of the Trust’s
NAV for the six months ended April 30, 2021 and the years ended October 31 2020, 2019 and 2018. The Trust reimbursed the Sponsor for $140,518, $433,106, $364,163, and $787,057, of legal fees for the six months ended April 30, 2021 and
the years ended October 31, 2020, 2019 and 2018, respectively which are included in Legal and audit fees on the Statements of Operations.

S&P
OPCO LLC (“S&P OPCO”), a subsidiary of S&P Dow Jones Indices LLC (as successor-in-interest to Dow Jones & Company, Inc.), per a license from
Standard & Poor’s Financial Services LLC, and State Street Global Advisors Funds Distributors, LLC (“SSGA FD” or the “Marketing Agent”) have entered into a license agreement, as amended from time to time (the
“License Agreement”). The License Agreement grants SSGA FD, an affiliate of the Trustee, a license to use the DJIA and to use certain trade names and trademarks of S&P OPCO in connection with the Trust. The DJIA also serves as the
basis for determining the composition of the Trust’s portfolio. The Trustee (on behalf of the Trust), the Sponsor and NYSE Arca, Inc. (“NYSE Arca”) have each received a sublicense from SSGA FD for the use of the DJIA and certain trade
names and trademarks in connection with their rights and duties with respect to the Trust. The License Agreement may be amended without the consent of any of the owners of beneficial interests of Units. The License Agreement is scheduled to be
effective until December 31, 2022 and automatically renew thereafter for successive annual periods. Pursuant to such arrangements and in accordance with the Trust Agreement, the Trust reimburses the Sponsor for payment of fees under the License
Agreement to S&P OPCO equal to 0.05% on the first $1 billion of the then rolling average asset balance and 0.04% on any excess rolling average asset balance over and above $1 billion. The minimum annual license fee for the Trust is
$1 million.

The Sponsor has entered into an agreement with the Marketing Agent pursuant to which the Marketing Agent has agreed to market and
promote the Trust. The Marketing Agent is reimbursed by the Sponsor for the expenses it incurs for providing such services out of amounts that the Trust reimburses the Sponsor. Expenses incurred by the Marketing Agent include, but are not limited
to: printing and distribution of marketing materials describing the Trust, associated legal, consulting, advertising and marketing costs and other out-of-pocket
expenses.

ALPS Distributors, Inc. (the “Distributor”) serves as the distributor of the Units. The Sponsor pays the Distributor for its
services a flat annual fee of $35,000, and the Trust does not reimburse the Sponsor for this fee.

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Notes to Financial Statements — (continued)

April 30, 2021 (Unaudited)

Note 4 — Unitholder Transactions

Units are issued and redeemed by the Trust only in Creation Unit size aggregations of 50,000 Units. Such
transactions are only permitted on an in-kind basis, with a separate cash payment that is equivalent to the undistributed net investment income per Unit (income equalization) and a balancing cash component to
equate the transaction to the NAV per Unit of the Trust on the transaction date. There is a transaction fee payable to the Trustee in connection with each creation and redemption of Creation Units made through the clearing process (the
“Transaction Fee”). The Transaction Fee is non-refundable, regardless of the NAV of the Trust. The Transaction Fee is the lesser of $1,000 or 0.10% (10 basis points) of the value of one Creation Unit
at the time of creation per participating party per day, regardless of the number of Creation Units created or redeemed on such day. The Transaction Fee is currently $1,000. For creations and redemptions outside the clearing process, including
orders from a participating party restricted from engaging in transactions in one or more of the common stocks that are included in the DJIA, an additional amount not to exceed three (3) times the Transaction Fee applicable for one Creation
Unit is charged per Creation Unit per day.

Note 5 — Investment Transactions

For the six months ended April 30, 2021, the Trust had in-kind contributions,
in-kind redemptions, purchases and sales of investment securities of $9,269,775,651, $7,979,293,052, $0 and $0 respectively. Net realized gain (loss) on investment transactions in the Statement of Operations
includes net gains resulting from in-kind transactions of $1,409,474,328.

Note 6 — Equity
Investing and Market Risk

An investment in the Trust involves risks similar to those of investing in any fund of equity securities, such as market
fluctuations caused by such factors as economic and political developments, changes in interest rates, perceived trends in securities prices, war, acts of terrorism, the spread of infectious disease or other public health issues. Local, regional or
global events such as war, acts of terrorism, the spread of infectious disease or other public health issues, recessions, or other events could have a significant impact on the Trust and its investments and could result in increased premiums or
discounts to the Trust’s net asset value.

An investment in the Trust is subject to the risks of any investment in a broadly based portfolio of
equity securities, including the risk that the general level of stock prices may decline, thereby adversely affecting the value of such investment. The value of common stocks actually held by the Trust and that make up the Trust’s portfolio
(the “Portfolio Securities”) may fluctuate in accordance with changes in the financial condition of the issuers of Portfolio Securities, the value of equity securities generally and other factors. The identity and weighting of common
stocks that are included in the DJIA and the Portfolio Securities change from time to time.

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Notes to Financial Statements — (continued)

April 30, 2021 (Unaudited)

Note 6 — Equity Investing and Market Risk – (continued)

The financial condition of issuers of Portfolio Securities may become impaired or the general condition of the
stock market may deteriorate, either of which may cause a decrease in the value of the Trust’s portfolio and thus in the value of Units. Since the Trust is not actively managed, the adverse financial condition of an issuer will not result in
its elimination from the Trust’s portfolio unless such issuer is removed from the DJIA. Equity securities are susceptible to general stock market fluctuations and to volatile increases and decreases in value as market confidence in and
perceptions of their issuers change. These investor perceptions are based on various and unpredictable factors, including expectations regarding government, economic, monetary and fiscal policies, inflation and interest rates, economic expansion or
contraction, and global or regional political, economic and banking crises, as well as war, acts of terrorism and the spread of infectious disease or other public health issues.

An outbreak of infectious respiratory illness caused by a novel coronavirus known as COVID-19 was first detected in China in December 2019 and was declared a pandemic by the
World Health Organization in March 2020. This coronavirus has resulted in travel restrictions, restrictions on gatherings of people (including closings of, or limitations on, dining and entertainment establishments, as well as schools and
universities), closed businesses (or businesses that are restricted in their operations), closed international borders, enhanced health screenings at ports of entry and elsewhere, disruption of and delays in healthcare service preparation and
delivery, prolonged quarantines, cancellations, supply chain disruptions, and lower consumer demand, as well as general concern and uncertainty. The impact of COVID-19, and other infectious disease outbreaks
that may arise in the future, could adversely affect the economies of many nations or the entire global economy, individual issuers and capital markets in ways that cannot necessarily be foreseen. Public health crises caused by the COVID-19 outbreak may exacerbate other pre-existing political, social and economic risks in certain countries or globally. The duration of the
COVID-19 outbreak cannot be determined with certainty. The risk of further spreading of COVID-19 has led to significant uncertainty and volatility in the financial
markets and disruption to the global economy, the consequences of which are currently unpredictable. Certain of the Trust’s investments are likely to have exposure to businesses that, as a result of
COVID-19, experience a slowdown or temporary suspension in business activities. These factors, as well as any restrictive measures instituted in order to prevent or control a pandemic or other public health
crisis, such as the one posed by COVID-19, could have a material and adverse effect on the Trust’s investments.

Holders of common stocks of any given issuer incur more risk than holders of preferred stocks and debt obligations of the issuer because the rights of common stockholders, as owners of the issuer, generally are
subordinate to the rights of creditors of, or holders of debt obligations or preferred stocks issued by, such issuer. Further, unlike debt securities that typically have a stated principal amount payable at maturity, or preferred stocks that
typically have a liquidation preference and may have

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Notes to Financial Statements — (continued)

April 30, 2021 (Unaudited)

Note 6 — Equity Investing and Market Risk – (continued)

stated optional or mandatory redemption provisions, common stocks have neither a fixed principal amount nor a maturity. Equity securities values are subject to market fluctuations as long as the
equity securities remain outstanding. The value of the Trust’s portfolio will fluctuate over the entire life of the Trust.

The Trust may have
significant investments in one or more specific industries or sectors, subjecting it to risks greater than general market risk.

The Trust may invest a
larger percentage of its assets in the securities of a few issuers. As a result, the Trust’s performance may be disproportionately impacted by the performance of relatively few securities.

There can be no assurance that the issuers of Portfolio Securities will pay dividends. Distributions generally depend upon the declaration of dividends by the
issuers of Portfolio Securities and the declaration of such dividends generally depends upon various factors, including the financial condition of the issuers and general economic conditions.

Note 7 — Subsequent Events

The Trustee has evaluated the impact of all subsequent events on the
Trust through the date on which the financial statements were issued and has determined that there were no subsequent events requiring adjustment or disclosure in the financial statements.

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Other Information

April 30, 2021 (Unaudited)

Comparison of Total Returns Based on NAV and Bid/Ask Price(1)

The table below is provided to compare the Trust’s total pre-tax return at NAV with the total pre-tax returns based on bid/ask price and the performance of
the DJIA. Past performance is not necessarily an indication of how the Trust will perform in the future.

Cumulative Total Return

Average Annual Total Return

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SPDR Dow Jones Industrial Average ETF Trust

(Unaudited)

Sponsor

PDR Services LLC

c/o NYSE Holdings LLC

11 Wall Street

New York, NY 10005

Trustee

State Street Global Advisors Trust Company

One Iron Street

Boston, MA 02210

Distributor

ALPS Distributors, Inc.

1290 Broadway Suite 1100

Denver, CO 80203

Independent Registered Public Accounting Firm

PricewaterhouseCoopers LLP

101 Seaport Boulevard, Suite 500

Boston, MA 02210

SPDRDIASAR