Tax-Managed Multi-Cap Growth Portfolio N-CSRS Certified semi-annual shareholder report (management investment company)

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FormN-CSR

CERTIFIED SHAREHOLDER REPORT OF REGISTERED

MANAGEMENT INVESTMENT COMPANIES

Investment Company Act File Number:811-09837

Tax-ManagedMulti-Cap Growth Portfolio

(Exact Name of Registrant as Specified in Charter)

Two International Place, Boston, Massachusetts 02110

(Address of Principal Executive Offices)

Maureen A. Gemma

Two International Place, Boston, Massachusetts 02110

(Name and Address of Agent for Services)

(617)482-8260

(Registrant’s Telephone Number)

October 31

Date of Fiscal Year End

April 30, 2019

Date of Reporting Period

Item 1. Reports to Stockholders

Tax-Managed Multi-Cap Growth Portfolio

April 30, 2019

Portfolio of Investments (Unaudited)

Common Stocks — 99.0%
Security	Shares		Value
Aerospace & Defense — 1.2%
Raytheon Co.		11,121	$	1,974,978
			$	1,974,978
Auto Components — 0.9%
Aptiv PLC		17,499	$	1,499,664
			$	1,499,664
Beverages — 2.3%
Coca-Cola Co. (The)		29,800	$	1,461,988
Constellation Brands, Inc., Class A		12,006		2,541,310
			$	4,003,298
Biotechnology — 2.2%
Celgene Corp.(1)		7,740	$	732,668
Vertex Pharmaceuticals, Inc.(1)		18,054		3,050,765
			$	3,783,433
Building Products — 1.6%
Fortune Brands Home & Security, Inc.		53,122	$	2,803,779
			$	2,803,779
Capital Markets — 2.6%
Charles Schwab Corp. (The)		68,069	$	3,116,199
S&P Global, Inc.		5,966		1,316,457
			$	4,432,656
Chemicals — 3.0%
Celanese Corp., Series A		14,828	$	1,599,793
Ecolab, Inc.		10,051		1,850,188
Sherwin-Williams Co. (The)		3,564		1,621,014
			$	5,070,995
Commercial Services & Supplies — 0.9%
Waste Connections, Inc.		16,156	$	1,498,792
			$	1,498,792
Electrical Equipment — 1.8%
AMETEK, Inc.		34,300	$	3,024,231
			$	3,024,231

Security	Shares		Value
Electronic Equipment, Instruments & Components — 0.9%
Littelfuse, Inc.		7,783	$	1,564,772
			$	1,564,772
Entertainment — 3.8%
Netflix, Inc.(1)		10,469	$	3,879,183
Walt Disney Co. (The)		18,526		2,537,506
			$	6,416,689
Food & Staples Retailing — 0.8%
US Foods Holding Corp.(1)		37,013	$	1,352,825
			$	1,352,825
Food Products — 0.6%
Mondelez International, Inc., Class A		21,503	$	1,093,428
			$	1,093,428
Health Care Equipment & Supplies — 4.1%
Align Technology, Inc.(1)		2,983	$	968,520
Danaher Corp.		11,868		1,571,798
ICU Medical, Inc.(1)		2,257		513,468
Intuitive Surgical, Inc.(1)		3,354		1,712,653
iRhythm Technologies, Inc.(1)		5,584		426,115
Stryker Corp.		9,839		1,858,685
			$	7,051,239
Health Care Providers & Services — 2.5%
Amedisys, Inc.(1)		4,463	$	570,461
UnitedHealth Group, Inc.		16,173		3,769,441
			$	4,339,902
Hotels, Restaurants & Leisure — 0.2%
Drive Shack, Inc.(1)		68,565	$	352,424
			$	352,424
Interactive Media & Services — 15.5%
Alphabet, Inc., Class A(1)		4,500	$	5,395,320
Alphabet, Inc., Class C(1)		5,402		6,420,169
Facebook, Inc., Class A(1)		37,408		7,234,707
IAC/InterActiveCorp.(1)		8,636		1,941,719
Pinterest, Inc., Class A(1)		30,000		929,400
Twitter, Inc.(1)		114,488		4,569,216
			$	26,490,531

13 See Notes to Financial Statements.

Tax-Managed Multi-Cap Growth Portfolio

April 30, 2019

Portfolio of Investments (Unaudited) — continued

Security	Shares		Value
Internet & Direct Marketing Retail — 9.6%
Amazon.com, Inc.(1)		7,760	$	14,949,795
Booking Holdings, Inc.(1)		735		1,363,418
			$	16,313,213
IT Services — 9.5%
Fiserv, Inc.(1)		13,974	$	1,219,092
GoDaddy, Inc., Class A(1)		61,194		4,987,311
Okta, Inc.(1)		29,863		3,106,648
Visa, Inc., Class A		42,000		6,906,060
			$	16,219,111
Life Sciences Tools & Services — 0.6%
Illumina, Inc.(1)		3,432	$	1,070,784
			$	1,070,784
Multiline Retail — 0.6%
Dollar Tree, Inc.(1)		9,018	$	1,003,523
			$	1,003,523
Oil, Gas & Consumable Fuels — 1.5%
Devon Energy Corp.		40,020	$	1,286,243
EOG Resources, Inc.		13,394		1,286,494
			$	2,572,737
Personal Products — 1.2%
Estee Lauder Cos., Inc. (The), Class A		11,555	$	1,985,265
			$	1,985,265
Pharmaceuticals — 2.7%
Eli Lilly & Co.		13,033	$	1,525,383
Zoetis, Inc.		29,530		3,007,335
			$	4,532,718
Road & Rail — 3.3%
J.B. Hunt Transport Services, Inc.		17,534	$	1,656,612
Norfolk Southern Corp.		10,434		2,128,745
Union Pacific Corp.		10,178		1,801,913
			$	5,587,270
Semiconductors & Semiconductor Equipment — 5.0%
Broadcom, Inc.		5,289	$	1,684,018
Monolithic Power Systems, Inc.		29,169		4,541,905
Texas Instruments, Inc.		19,463		2,293,325
			$	8,519,248

Security	Shares		Value
Software — 10.6%
Adobe, Inc.(1)		21,593	$	6,245,775
Intuit, Inc.		6,414		1,610,299
Palo Alto Networks, Inc.(1)		9,985		2,484,568
Proofpoint, Inc.(1)		7,763		973,635
SailPoint Technologies Holding, Inc.(1)		41,753		1,179,940
salesforce.com, inc.(1)		33,800		5,588,830
			$	18,083,047
Specialty Retail — 3.6%
Home Depot, Inc. (The)		9,189	$	1,871,799
TJX Cos., Inc. (The)		38,432		2,109,148
Ulta Beauty, Inc.(1)		6,209		2,166,817
			$	6,147,764
Technology Hardware, Storage & Peripherals — 2.1%
Apple, Inc.		17,520	$	3,515,738
			$	3,515,738
Textiles, Apparel & Luxury Goods — 2.5%
Lululemon Athletica, Inc.(1)		14,330	$	2,527,096
NIKE, Inc., Class B		19,321		1,696,963
			$	4,224,059
Trading Companies & Distributors — 1.3%
United Rentals, Inc.(1)		15,867	$	2,235,978
			$	2,235,978
Total Common Stocks (identified cost $73,224,318)			$	168,764,091
Short-Term Investments — 0.9%
Description	Units		Value
Eaton Vance Cash Reserves Fund, LLC, 2.54%(2)		1,452,945	$	1,452,945
Total Short-Term Investments (identified cost $1,452,935)			$	1,452,945
Total Investments — 99.9% (identified cost $74,677,253)			$	170,217,036
Other Assets, Less Liabilities — 0.1%			$	185,311
Net Assets — 100.0%			$	170,402,347

14 See Notes to Financial Statements.

Tax-Managed Multi-Cap Growth Portfolio

April 30, 2019

Portfolio of Investments (Unaudited) — continued

The percentage shown for each investment category in the Portfolio of Investments is based on net assets.

⁽¹⁾  Non-income producing security.

⁽²⁾  Affiliated investment company, available to Eaton Vance portfolios and funds, which invests in high quality, U.S. dollar denominated money market instruments. The rate shown is the annualizedseven-day yield as of April 30, 2019.

15 See Notes to Financial Statements.

Tax-Managed Multi-Cap Growth Portfolio

April 30, 2019

Statement of Assets and Liabilities (Unaudited)

Assets	April 30, 2019
Unaffiliated investments, at value (identified cost, $73,224,318)	$	168,764,091
Affiliated investment, at value (identified cost, $1,452,935)		1,452,945
Dividends receivable		24,517
Dividends receivable from affiliated investment		2,924
Receivable for investments sold		549,036
Tax reclaims receivable		8,355
Total assets	$	170,801,868
Liabilities
Payable for investments purchased	$	263,971
Payable to affiliates:
Investment adviser fee		88,819
Trustees’ fees		698
Accrued expenses		46,033
Total liabilities	$	399,521
Net Assets applicable to investors’ interest in Portfolio	$	170,402,347

16 See Notes to Financial Statements.

Tax-Managed Multi-Cap Growth Portfolio

April 30, 2019

Statement of Operations (Unaudited)

Investment Income	Six Months Ended April 30, 2019
Dividends (net of foreign taxes, $2,793)	$	517,613
Dividends from affiliated investment		29,953
Total investment income	$	547,566
Expenses
Investment adviser fee	$	496,947
Trustees’ fees and expenses		4,266
Custodian fee		36,641
Legal and accounting services		19,814
Miscellaneous		2,083
Total expenses	$	559,751
Net investment loss	$	(12,185	)
Realized and Unrealized Gain (Loss)
Net realized gain (loss) —
Investment transactions	$	1,398,645	(1)
Investment transactions — affiliated investment		(560	)
Foreign currency transactions		(12	)
Net realized gain	$	1,398,073
Change in unrealized appreciation (depreciation) —
Investments	$	20,147,208
Investments — affiliated investment		788
Net change in unrealized appreciation (depreciation)	$	20,147,996
Net realized and unrealized gain	$	21,546,069
Net increase in net assets from operations	$	21,533,884

⁽¹⁾   Includes $1,606,810 of net realized gains from redemptionsin-kind.

17 See Notes to Financial Statements.

Tax-Managed Multi-Cap Growth Portfolio

April 30, 2019

Statements of Changes in Net Assets

Increase (Decrease) in Net Assets	Six Months Ended April 30, 2019 (Unaudited)			Year Ended October 31, 2018
From operations —
Net investment loss	$	(12,185	)	$	(58,382	)
Net realized gain		1,398,073	(1)		3,713,260	(2)
Net change in unrealized appreciation (depreciation)		20,147,996			14,471,549
Net increase in net assets from operations	$	21,533,884		$	18,126,427
Capital transactions —
Contributions	$	1,583,323		$	5,611,268
Withdrawals		(6,081,078	)		(9,912,178	)
Net decrease in net assets from capital transactions	$	(4,497,755	)	$	(4,300,910	)
Net increase in net assets	$	17,036,129		$	13,825,517
Net Assets
At beginning of period	$	153,366,218		$	139,540,701
At end of period	$	170,402,347		$	153,366,218

⁽¹⁾   Includes $1,606,810 of net realized gains from redemptionsin-kind.

⁽²⁾  Includes $164,775 of net realized gains from redemptionsin-kind.

18 See Notes to Financial Statements.

Tax-Managed Multi-Cap Growth Portfolio

April 30, 2019

Financial Highlights

	Six Months Ended April 30, 2019 (Unaudited)			Year Ended October 31,
Ratios/Supplemental Data				2018			2017			2016			2015			2014
Ratios (as a percentage of average daily net assets):
Expenses(1)		0.73	%(2)		0.72	%		0.73	%		0.73	%		0.73	%		0.73	%
Net investment income (loss)		(0.02	)%(2)		(0.04	)%		0.09	%		0.28	%		0.06	%		(0.01	)%
Portfolio Turnover		6	%(3)		18	%		34	%		33	%		26	%		29	%
Total Return		14.45	%(3)		13.18	%		23.40	%		0.77	%		8.77	%		10.64	%
Net assets, end of period (000’s omitted)	$	170,402		$	153,366		$	139,541		$	119,188		$	126,104		$	113,791

⁽¹⁾   Excludes the effect of custody fee credits, if any, of less than 0.005%. Effective September 1, 2015, custody fee credits, which were earned on cash deposit balances, were discontinued by the custodian.

⁽²⁾  Annualized.

⁽³⁾  Not annualized.

19 See Notes to Financial Statements.

Tax-Managed Multi-Cap Growth Portfolio

April 30, 2019

Notes to Financial Statements (Unaudited)

1  Significant Accounting Policies

Tax-ManagedMulti-Cap Growth Portfolio (the Portfolio) is a Massachusetts business trust registered under the Investment Company Act of 1940, as amended (the 1940 Act), as a diversified,open-end management investment company. The Portfolio’s investment objective is to achieve long-term,after-tax returns by investing in a diversified portfolio of equity securities. The Declaration of Trust permits the Trustees to issue interests in the Portfolio. At April 30, 2019, Eaton VanceTax-ManagedMulti-Cap Growth Fund and Eaton VanceTax-Managed Equity Asset Allocation Fund held an interest of 58.3% and 41.7%, respectively, in the Portfolio.

The following is a summary of significant accounting policies of the Portfolio. The policies are in conformity with accounting principles generally accepted in the United States of America (U.S. GAAP). The Portfolio is an investment company and follows accounting and reporting guidance in the Financial Accounting Standards Board (FASB) Accounting Standards Codification Topic 946.

A  Investment Valuation — The following methodologies are used to determine the market value or fair value of investments.

Equity Securities.Equity securities listed on a U.S. securities exchange generally are valued at the last sale or closing price on the day of valuation or, if no sales took place on such date, at the mean between the closing bid and ask prices on the exchange where such securities are principally traded. Equity securities listed on the NASDAQ Global or Global Select Market generally are valued at the NASDAQ official closing price. Unlisted or listed securities for which closing sales prices or closing quotations are not available are valued at the mean between the latest available bid and ask prices.

Affiliated Fund.The Portfolio may invest in Eaton Vance Cash Reserves Fund, LLC (Cash Reserves Fund), an affiliated investment company managed by Eaton Vance Management (EVM). While Cash Reserves Fund is not a registered money market mutual fund, it conducts all of its investment activities in accordance with the requirements of Rule2a-7 under the 1940 Act. Investments in Cash Reserves Fund are valued at the closing net asset value per unit on the valuation day. Cash Reserves Fund generally values its investment securities based on available market quotations provided by a third party pricing service.

Fair Valuation.Investments for which valuations or market quotations are not readily available or are deemed unreliable are valued at fair value using methods determined in good faith by or at the direction of the Trustees of the Portfolio in a manner that most fairly reflects the security’s “fair value”, which is the amount that the Portfolio might reasonably expect to receive for the security upon its current sale in the ordinary course. Each such determination is based on a consideration of relevant factors, which are likely to vary from one pricing context to another. These factors may include, but are not limited to, the type of security, the existence of any contractual restrictions on the security’s disposition, the price and extent of public trading in similar securities of the issuer or of comparable companies or entities, quotations or relevant information obtained from broker/dealers or other market participants, information obtained from the issuer, analysts, and/or the appropriate stock exchange (for exchange-traded securities), an analysis of the company’s or entity’s financial statements, and an evaluation of the forces that influence the issuer and the market(s) in which the security is purchased and sold.

B  Investment Transactions — Investment transactions for financial statement purposes are accounted for on a trade date basis. Realized gains and losses on investments sold are determined on the basis of identified cost.

C  Income — Dividend income is recorded on theex-dividend date for dividends received in cash and/or securities. However, if theex-dividend date has passed, certain dividends from foreign securities are recorded as the Portfolio is informed of theex-dividend date. Withholding taxes on foreign dividends and capital gains have been provided for in accordance with the Portfolio’s understanding of the applicable countries’ tax rules and rates.

D  Federal Taxes — The Portfolio has elected to be treated as a partnership for federal tax purposes. No provision is made by the Portfolio for federal or state taxes on any taxable income of the Portfolio because each investor in the Portfolio is ultimately responsible for the payment of any taxes on its share of taxable income. Since at least one of the Portfolio’s investors is a regulated investment company that invests all or substantially all of its assets in the Portfolio, the Portfolio normally must satisfy the applicable source of income and diversification requirements (under the Internal Revenue Code) in order for its investors to satisfy them. The Portfolio will allocate, at least annually among its investors, each investor’s distributive share of the Portfolio’s net investment income, net realized capital gains and losses and any other items of income, gain, loss, deduction or credit.

As of April 30, 2019, the Portfolio had no uncertain tax positions that would require financial statement recognition,de-recognition, or disclosure. The Portfolio files a U.S. federal income tax return annually after its fiscalyear-end, which is subject to examination by the Internal Revenue Service for a period of three years from the date of filing.

E  Foreign Currency Translation — Other assets and liabilities initially expressed in foreign currencies are translated each business day into U.S. dollars based upon current exchange rates. Income and expenses denominated in foreign currencies are translated into U.S. dollars based upon currency exchange rates in effect on the respective dates of such transactions.

F  Use of Estimates — The preparation of the financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of income and expense during the reporting period. Actual results could differ from those estimates.

G  Indemnifications — Under the Portfolio’s organizational documents, its officers and Trustees may be indemnified against certain liabilities and expenses arising out of the performance of their duties to the Portfolio. Under Massachusetts law, if certain conditions prevail, interestholders in the Portfolio could be deemed to have personal liability for the obligations of the Portfolio. However, the Portfolio’s Declaration of Trust contains an express disclaimer of

20

Tax-Managed Multi-Cap Growth Portfolio

April 30, 2019

Notes to Financial Statements (Unaudited) — continued

liability on the part of Portfolio interestholders and theBy-laws provide that the Portfolio shall assume the defense on behalf of any Portfolio interestholder. Moreover, theBy-laws also provide for indemnification out of Portfolio property of any interestholder held personally liable solely by reason of being or having been an interestholder for all loss or expense arising from such liability. Additionally, in the normal course of business, the Portfolio enters into agreements with service providers that may contain indemnification clauses. The Portfolio’s maximum exposure under these arrangements is unknown as this would involve future claims that may be made against the Portfolio that have not yet occurred.

H  Interim Financial Statements — The interim financial statements relating to April 30, 2019 and for the six months then ended have not been audited by an independent registered public accounting firm, but in the opinion of the Portfolio’s management, reflect all adjustments, consisting only of normal recurring adjustments, necessary for the fair presentation of the financial statements.

2  Investment Adviser Fee and Other Transactions with Affiliates

The investment adviser fee is earned by Boston Management and Research (BMR), a subsidiary of EVM, as compensation for investment advisory services rendered to the Portfolio. The fee is computed at an annual rate of 0.65% of the Portfolio’s average daily net assets up to $500 million, and is payable monthly. On net assets of $500 million and over, the annual fee is reduced. For the six months ended April 30, 2019, the Portfolio’s investment adviser fee amounted to $496,947 or 0.65% (annualized) of the Portfolio’s average daily net assets. The Portfolio invests its cash in Cash Reserves Fund. EVM does not currently receive a fee for advisory services provided to Cash Reserves Fund.

Trustees and officers of the Portfolio who are members of EVM’s or BMR’s organizations receive remuneration for their services to the Portfolio out of the investment adviser fee. Trustees of the Portfolio who are not affiliated with the investment adviser may elect to defer receipt of all or a percentage of their annual fees in accordance with the terms of the Trustees Deferred Compensation Plan. For the six months ended April 30, 2019, no significant amounts have been deferred. Certain officers and Trustees of the Portfolio are officers of the above organizations.

3  Purchases and Sales of Investments

Purchases and sales of investments, other than short-term obligations andin-kind transaction, aggregated $11,159,615 and $8,745,790, respectively, for the six months ended April 30, 2019.In-kind sales for the six months ended April 30, 2019 aggregated $1,949,442.

4  Federal Income Tax Basis of Investments

The cost and unrealized appreciation (depreciation) of investments of the Portfolio at April 30, 2019, as determined on a federal income tax basis, were as follows:

Aggregate cost	$	74,677,890
Gross unrealized appreciation	$	95,901,325
Gross unrealized depreciation		(362,179	)
Net unrealized appreciation	$	95,539,146

5  Line of Credit

The Portfolio participates with other portfolios and funds managed by EVM and its affiliates in a $625 million unsecured line of credit agreement with a group of banks, which is in effect through October 29, 2019. Borrowings are made by the Portfolio solely to facilitate the handling of unusual and/or unanticipated short-term cash requirements. Interest is charged to the Portfolio based on its borrowings at an amount above either the Eurodollar rate or Federal Funds rate. In addition, a fee computed at an annual rate of 0.15% on the daily unused portion of the line of credit is allocated among the participating portfolios and funds at the end of each quarter. Because the line of credit is not available exclusively to the Portfolio, it may be unable to borrow some or all of its requested amounts at any particular time. The Portfolio did not have any significant borrowings or allocated fees during the six months ended April 30, 2019.

21

Tax-Managed Multi-Cap Growth Portfolio

April 30, 2019

Notes to Financial Statements (Unaudited) — continued

6  Fair Value Measurements

Under generally accepted accounting principles for fair value measurements, a three-tier hierarchy to prioritize the assumptions, referred to as inputs, is used in valuation techniques to measure fair value. The three-tier hierarchy of inputs is summarized in the three broad levels listed below.

• Level 1 – quoted prices in active markets for identical investments

• Level 2 – other significant observable inputs (including quoted prices for similar investments, interest rates, prepayment speeds, credit risk, etc.)

• Level 3 – significant unobservable inputs (including a fund’s own assumptions in determining the fair value of investments)

In cases where the inputs used to measure fair value fall in different levels of the fair value hierarchy, the level disclosed is determined based on the lowest level input that is significant to the fair value measurement in its entirety. The inputs or methodology used for valuing securities are not necessarily an indication of the risk associated with investing in those securities.

At April 30, 2019, the hierarchy of inputs used in valuing the Portfolio’s investments, which are carried at value, were as follows:

Asset Description	Level 1			Level 2		Level 3		Total
Common Stocks	$	168,764,091	*	$	—	$	—	$	168,764,091
Short-Term Investments		—			1,452,945		—		1,452,945
Total Investments	$	168,764,091		$	1,452,945	$	—	$	170,217,036

* The level classification by major category of investments is the same as the category presentation in the Portfolio of Investments.

22

Eaton Vance

Tax-Managed Multi-Cap Growth Fund

April 30, 2019

Board of Trustees’ Contract Approval

Overview of the Contract Review Process

The Investment Company Act of 1940, as amended (the “1940 Act”), provides, in substance, that the investment advisory agreement between a fund and its investment adviser will continue in effect fromyear-to-year only if its continuation is approved on an annual basis by a vote of the fund’s board of trustees, including a majority of the trustees who are not “interested persons” of the fund (“independent trustees”), cast in person at a meeting called for the purpose of considering such approval.

At a meeting held on April 24, 2019, the Boards of Trustees/Directors (collectively, the “Board”) of the registered investment companies advised by Eaton Vance Management or its affiliate, Boston Management and Research (the “Eaton Vance Funds”), including a majority of the independent trustees (the “Independent Trustees”), voted to approve the continuation of existing investment advisory andsub-advisory agreements for each of the Eaton Vance Funds for an additionalone-year period. In voting its approval, the Board relied upon the affirmative recommendation of its Contract Review Committee, which is a committee exclusively comprised of Independent Trustees. Prior to making its recommendation, the Contract Review Committee reviewed information furnished by the adviser andsub-adviser (where applicable) to each of the Eaton Vance Funds (including information specifically requested by the Board) for a series of meetings held between February and April 2019. Members of the Contract Review Committee also considered information received at prior meetings of the Board and its committees, to the extent such information was relevant to the Contract Review Committee’s annual evaluation of the investment advisory andsub-advisory agreements.

Among other things, the information the Board considered included the following (for funds that invest through one or more underlying portfolios, references to “each fund” in this section may include information that was considered at the portfolio-level):

Information about Fees, Performance and Expenses

• A report from an independent data provider comparing advisory and related fees paid by each fund to such fees paid by comparable funds, as identified by the independent data provider (“comparable funds”);

• A report from an independent data provider comparing each fund’s total expense ratio (and its components) to those of comparable funds;

• A report from an independent data provider comparing the investment performance of each fund (including, where relevant, yield data, Sharpe ratios and information ratios) to the investment performance of comparable funds over various time periods;

• Data regarding investment performance relative to benchmark indices and, in certain instances, to customized groups of peer funds and blended indices identified by the adviser in consultation with the Portfolio Management Committee of the Board;

• Comparative information concerning the fees charged and services provided by the adviser andsub-adviser (where applicable) to each fund in managing other accounts (including mutual funds, other collective investment funds and institutional accounts) using investment strategies and techniques similar to those used in managing such fund(s), if any;

• Profitability analyses with respect to the adviser andsub-adviser (where applicable) to each of the funds;

Information about Portfolio Management and Trading

• Descriptions of the investment management services provided to each fund, as well as each of the funds’ investment strategies and policies;

• The procedures and processes used to determine the fair value of fund assets, when necessary, and actions taken to monitor and test the effectiveness of such procedures and processes;

• Information about the policies and practices of each fund’s adviser andsub-adviser (where applicable and in the context of asub-adviser with trading responsibilities) with respect to trading, including their processes for seeking best execution of portfolio transactions;

• Information about the allocation of brokerage transactions and the benefits, if any, received by the adviser andsub-adviser (where applicable and in the context of asub-adviser with trading responsibilities) to each fund as a result of brokerage allocation, including information concerning the acquisition of research through client commission arrangements and policies with respect to “soft dollars”;

• Data relating to the portfolio turnover rate of each fund;

Information about each Adviser andSub-adviser

• Reports detailing the financial results and condition of the adviser andsub-adviser (where applicable) to each fund;

• Information regarding the individual investment professionals whose responsibilities include portfolio management and investment research for the funds, and, for portfolio managers and certain other investment professionals, information relating to their responsibilities with respect to managing other mutual funds and investment accounts, if applicable;

• The Code of Ethics of the adviser and its affiliates and thesub-adviser (where applicable) of each fund, together with information relating to compliance with, and the administration of, such codes;

• Policies and procedures relating to proxy voting and the handling of corporate actions and class actions;

• Information concerning the resources devoted to compliance efforts undertaken by the adviser and its affiliates and thesub-adviser (where applicable) of each fund, if any, including descriptions of their various compliance programs and their record of compliance;

• Information concerning the business continuity and disaster recovery plans of the adviser and its affiliates and thesub-adviser (where applicable) of each fund, if any;

23

Eaton Vance

Tax-Managed Multi-Cap Growth Fund

April 30, 2019

Board of Trustees’ Contract Approval — continued

• A description of Eaton Vance Management’s and Boston Management and Research’s oversight ofsub-advisers, including with respect to regulatory and compliance issues, investment management and other matters;

Other Relevant Information

• Information concerning the nature, cost and character of the administrative and othernon-investment advisory services provided by Eaton Vance Management and its affiliates;

• Information concerning management of the relationship with the custodian, subcustodians and fund accountants by the adviser or administrator to each of the funds; and

• The terms of each investment advisory agreement.

During the various meetings of the Board and its committees throughout the twelve months ended April 2019, the Trustees received information from portfolio managers and other investment professionals of the advisers andsub-advisers (where applicable) of the funds regarding investment and performance matters, and considered various investment and trading strategies used in pursuing the funds’ investment objectives. The Trustees also received information regarding risk management techniques employed in connection with the management of the funds. The Board and its Committees evaluated issues pertaining to industry and regulatory developments, compliance procedures, fund governance and other issues with respect to the funds, and received and participated in reports and presentations provided by Eaton Vance Management, Boston Management and Research and fundsub-advisers (as applicable), with respect to such matters. In addition to the formal meetings of the Board and its committees, the Independent Trustees held regular teleconferences to discuss, among other topics, matters relating to the continuation of investment advisory andsub-advisory agreements.

The Contract Review Committee was advised throughout the contract review process by Goodwin Procter LLP, independent legal counsel for the Independent Trustees. The members of the Contract Review Committee, with the advice of such counsel, exercised their own business judgment in determining the material factors to be considered in evaluating each investment advisory andsub-advisory agreement and the weight to be given to each such factor. The conclusions reached with respect to each investment advisory andsub-advisory agreement were based on a comprehensive evaluation of all the information provided and not any single factor. Moreover, each member of the Contract Review Committee may have placed varying emphasis on particular factors in reaching conclusions with respect to each investment advisory andsub-advisory agreement. In evaluating each investment advisory andsub-advisory agreement, including the fee structures and other terms contained in such agreements, the members of the Contract Review Committee were also informed by multiple years of analysis and discussion with the adviser andsub-adviser (where applicable) to each of the Eaton Vance Funds.

Results of the Process

Based on its consideration of the foregoing, and such other information as it deemed relevant, including the factors and conclusions described below, the Contract Review Committee concluded that the continuation of the investment advisory agreement betweenTax-ManagedMulti-Cap Growth Portfolio (the “Portfolio”), the portfolio in which Eaton VanceTax-ManagedMulti-Cap Growth Fund (the “Fund”) invests, and Boston Management and Research (the “Adviser”), including its fee structure, is in the interests of shareholders and, therefore, recommended to the Board approval of the agreement. Based on the recommendation of the Contract Review Committee, the Board, including a majority of the Independent Trustees, voted to approve continuation of the investment advisory agreement for the Portfolio.

Nature, Extent and Quality of Services

In considering whether to approve the investment advisory agreement for the Portfolio, the Board evaluated the nature, extent and quality of services provided to the Portfolio by the Adviser.

The Board considered the Adviser’s management capabilities and investment processes in light of the types of investments held by the Portfolio, including the education, experience and number of investment professionals and other personnel who provide portfolio management, investment research, and similar services to the Portfolio, including recent changes to such personnel. The Board specifically noted that the Adviser has devoted extensive resources toin-house equity research capabilities and also draws upon independent research available from third-party sources. The Board considered the Adviser’s experience managing funds that seek to maximizeafter-tax returns. The Board also took into account the resources dedicated to portfolio management and other services, the compensation methods of the Adviser and other factors, including the reputation and resources of the Adviser to recruit and retain highly qualified research, advisory and supervisory investment professionals. In addition, the Board considered the time and attention devoted to the Eaton Vance Funds, including the Portfolio, by senior management, as well as the infrastructure, operational capabilities and support staff in place to assist in the portfolio management and operations of the Portfolio, including the provision of administrative services. The Board also considered the business-related and other risks to which the Adviser or its affiliates may be subject in managing the Portfolio.

The Board considered the compliance programs of the Adviser and relevant affiliates thereof. The Board considered compliance and reporting matters regarding, among other things, personal trading by investment professionals, disclosure of portfolio holdings, late trading, frequent trading, portfolio valuation, business continuity and the allocation of investment opportunities. The Board also considered the responses of the Adviser and its affiliates to requests in recent years from regulatory authorities, such as the Securities and Exchange Commission and the Financial Industry Regulatory Authority.

24

Eaton Vance

Tax-Managed Multi-Cap Growth Fund

April 30, 2019

Board of Trustees’ Contract Approval — continued

The Board considered shareholder and other administrative services provided or managed by Eaton Vance Management and its affiliates, including transfer agency and accounting services. The Board evaluated the benefits to shareholders of investing in a fund that is a part of a large fund complex offering exposure to a variety of asset classes and investment disciplines, as well as the ability, in many cases, to exchange an investment among different funds without incurring additional sales charges.

After consideration of the foregoing factors, among others, the Board concluded that the nature, extent and quality of services provided by the Adviser, taken as a whole, are appropriate and consistent with the terms of the investment advisory agreement.

Fund Performance

The Board compared the Fund’s investment performance to that of comparable funds and appropriate benchmark indices. The Board’s review included comparative performance data with respect to the Fund for theone-, three-, five- andten-year periods ended September 30, 2018. In this regard, the Board noted that the performance of the Fund was higher than the median performance of the Fund’s peer group for the three-year period. The Board also noted that the performance of the Fund was higher than its secondary benchmark index, but lower than its primary benchmark index, for the three-year period. The Board concluded that the performance of the Fund was satisfactory.

Management Fees and Expenses

The Board considered contractual fee rates payable by the Portfolio and by the Fund for advisory and administrative services (referred to collectively as “management fees”). As part of its review, the Board considered the Fund’s management fees and total expense ratio for theone-year period ended September 30, 2018, as compared to those of comparable funds, before and after giving effect to any undertaking to waive fees or reimburse expenses. The Board also received and considered information about the services offered and the fee rates charged by the Adviser to other types of accounts with investment objectives and strategies that are substantially similar to and/or managed in a similar investment style as the Portfolio. In this regard, the Board received information about the differences in the nature and scope of services the Adviser provides to the Portfolio as compared to other types of accounts and the material differences in compliance, reporting and other legal burdens and risks to the Adviser as between the Portfolio and other types of accounts. The Board also considered certain factors identified by management in response to inquiries from the Contract Review Committee regarding the Fund’s total expense ratio relative to comparable funds.

After considering the foregoing information, and in light of the nature, extent and quality of the services provided by the Adviser, the Board concluded that the management fees charged for advisoryand related services are reasonable.

Profitability and“Fall-Out” Benefits

The Board considered the level of profits realized by the Adviser and relevant affiliates thereof in providing investment advisory and administrative services to the Fund, to the Portfolio and to all Eaton Vance Funds as a group. The Board considered the level of profits realized without regard to marketing support or other payments by the Adviser and its affiliates to third parties in respect of distribution services.

The Board concluded that, in light of the foregoing factors and the nature, extent and quality of the services rendered, the profits realized by the Adviser and its affiliates are deemed not to be excessive.

The Board also considered direct or indirectfall-out benefits received by the Adviser and its affiliates in connection with their respective relationships with the Fund and the Portfolio, including the benefits of research services that may be available to the Adviser as a result of securities transactions effected for the Portfolio and other investment advisory clients.

Economies of Scale

In reviewing management fees and profitability, the Board also considered the extent to which the Adviser and its affiliates, on the one hand, and the Fund and the Portfolio, on the other hand, can expect to realize benefits from economies of scale as the assets of the Fund and the Portfolio increase. The Board acknowledged the difficulty in accurately measuring the benefits resulting from economies of scale, if any, with respect to the management of any specific fund or group of funds. The Board reviewed data summarizing the increases and decreases in the assets of the Fund and of all Eaton Vance Funds as a group over various time periods, and evaluated the extent to which the total expense ratio of the Fund and the profitability of the Adviser and its affiliates may have been affected by such increases or decreases. Based upon the foregoing, the Board concluded that the Fund currently shares in the benefits from economies of scale, if any, when they are realized by the Adviser. The Board also concluded that the structure of the advisory fee, which includes breakpoints at several asset levels, will allow the Fund and the Portfolio to continue to benefit from any economies of scale in the future.

25

Eaton Vance

Tax-Managed Multi-Cap Growth Fund

April 30, 2019

Officers and Trustees

Officers of Eaton VanceTax-ManagedMulti-Cap Growth Fund

Payson F. Swaffield

President

Maureen A. Gemma

Vice President, Secretary and

Chief Legal Officer

James F. Kirchner

Treasurer

Richard F. Froio

Chief Compliance Officer

Officers ofTax-ManagedMulti-Cap Growth Portfolio

Edward J. Perkin

President

Maureen A. Gemma

Vice President, Secretary and

Chief Legal Officer

James F. Kirchner

Treasurer

Richard F. Froio

Chief Compliance Officer

Trustees of Eaton VanceTax-ManagedMulti-Cap Growth Fund andTax-ManagedMulti-Cap Growth Portfolio

William H. Park

Chairperson

Thomas E. Faust Jr.*

Mark R. Fetting

Cynthia E. Frost

George J. Gorman

Valerie A. Mosley

Helen Frame Peters

Keith Quinton⁽¹⁾

Marcus L. Smith⁽¹⁾

Susan J. Sutherland

Scott E. Wennerholm

* Interested Trustee

⁽¹⁾  Messrs. Quinton and Smith began serving as Trustees effective October 1, 2018.

26

Eaton Vance Funds

IMPORTANT NOTICES

Privacy.  The Eaton Vance organization is committed to ensuring your financial privacy. Each of the financial institutions identified below has in effect the following policy (“Privacy Policy”) with respect to nonpublic personal information about its customers:

• Only such information received from you, through application forms or otherwise, and information about your Eaton Vance fund transactions will be collected. This may include information such as name, address, social security number, tax status, account balances and transactions.

• None of such information about you (or former customers) will be disclosed to anyone, except as permitted by law (which includes disclosure to employees necessary to service your account). In the normal course of servicing a customer’s account, Eaton Vance may share information with unaffiliated third parties that perform various required services such as transfer agents, custodians and broker-dealers.

• Policies and procedures (including physical, electronic and procedural safeguards) are in place that are designed to protect the confidentiality of such information.

• We reserve the right to change our Privacy Policy at any time upon proper notification to you. Customers may want to review our Privacy Policy periodically for changes by accessing the link on our homepage: www.eatonvance.com.

Our pledge of privacy applies to the following entities within the Eaton Vance organization: the Eaton Vance Family of Funds, Eaton Vance Management, Eaton Vance Investment Counsel, Eaton Vance Distributors, Inc., Eaton Vance Trust Company, Eaton Vance Management (International) Limited, Eaton Vance Advisers International Ltd., Eaton Vance Management’s Real Estate Investment Group and Boston Management and Research. In addition, our Privacy Policy applies only to those Eaton Vance customers who are individuals and who have a direct relationship with us. If a customer’s account (i.e., fund shares) is held in the name of a third-party financial advisor/broker-dealer, it is likely that only such advisor’s privacy policies apply to the customer. This notice supersedes all previously issued privacy disclosures. For more information about Eaton Vance’s Privacy Policy, please call1-800-262-1122.

Delivery of Shareholder Documents.  The Securities and Exchange Commission (SEC) permits funds to deliver only one copy of shareholder documents, including prospectuses, proxy statements and shareholder reports, to fund investors with multiple accounts at the same residential or post office box address. This practice is often called “householding” and it helps eliminate duplicate mailings to shareholders.Eaton Vance, or your financial advisor, may household the mailing of your documents indefinitely unless you instruct Eaton Vance, or your financial advisor, otherwise.If you would prefer that your Eaton Vance documents not be householded, please contact Eaton Vance at1-800-262-1122, or contact your financial advisor. Your instructions that householding not apply to delivery of your Eaton Vance documents will typically be effective within 30 days of receipt by Eaton Vance or your financial advisor.

Portfolio Holdings.  Each Eaton Vance Fund and its underlying Portfolio(s) (if applicable) files a schedule of portfolio holdings on Part F toForm N-PORT with the SEC for the first and third quarters of each fiscal year. The FormN-PORT will be available on the Eaton Vance website at www.eatonvance.com, by calling Eaton Vance at1-800-262-1122 or in the EDGAR database on the SEC’s website at www.sec.gov.

Proxy Voting.  From time to time, funds are required to vote proxies related to the securities held by the funds. The Eaton Vance Funds or their underlying Portfolios (if applicable) vote proxies according to a set of policies and procedures approved by the Funds’ and Portfolios’ Boards. You may obtain a description of these policies and procedures and information on how the Funds or Portfolios voted proxies relating to portfolio securities during the most recent12-month period ended June 30, without charge, upon request, by calling1-800-262-1122 and by accessing the SEC’s website at www.sec.gov.

27

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Investment Adviser ofTax-ManagedMulti-Cap Growth Portfolio

Boston Management and Research

Two International Place

Boston, MA 02110

Administrator of Eaton VanceTax-ManagedMulti-Cap Growth Fund

Eaton Vance Management

Two International Place

Boston, MA 02110

Principal Underwriter*

Eaton Vance Distributors, Inc.

Two International Place

Boston, MA 02110

(617)482-8260

Custodian

State Street Bank and Trust Company

State Street Financial Center, One Lincoln Street

Boston, MA 02111

Transfer Agent

BNY Mellon Investment Servicing (US) Inc.

Attn: Eaton Vance Funds

P.O. Box 9653

Providence, RI 02940-9653

(800)262-1122

Fund Offices

Two International Place

Boston, MA 02110

* FINRA BrokerCheck.  Investors may check the background of their Investment Professional by contacting the Financial Industry Regulatory Authority (FINRA). FINRA BrokerCheck is a free tool to help investors check the professional background of current and former FINRA-registered securities firms and brokers. FINRA BrokerCheck is available by calling1-800-289-9999 and at www.FINRA.org. The FINRA BrokerCheck brochure describing this program is available to investors at www.FINRA.org.

7717    4.30.19

Item 2. Code of Ethics

Not required in this filing.

Item 3. Audit Committee Financial Expert

Not required in this filing.

Item 4. Principal Accountant Fees and Services

Not required in this filing.

Item 5. Audit Committee of Listed Registrants

Not applicable.

Item 6. Schedule of Investments

Please see schedule of investments contained in the Report to Stockholders included under Item 1 of this FormN-CSR.

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

Not applicable.

Item 8. Portfolio Managers ofClosed-End Management Investment Companies

Not applicable.

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

Not applicable.

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

No material changes.

Item 11. Controls and Procedures

(a) It is the conclusion of the registrant’s principal executive officer and principal financial officer that the effectiveness of the registrant’s current disclosure controls and procedures (such disclosure controls and procedures having been evaluated within 90 days of the date of this filing) provide reasonable assurance that the information required to be disclosed by the registrant has been recorded, processed, summarized and reported within the time period specified in the Commission’s rules and forms and that the information required to be disclosed by the registrant has been accumulated and communicated to the registrant’s principal executive officer and principal financial officer in order to allow timely decisions regarding required disclosure.

(b) There have been no changes in the registrant’s internal controls over financial reporting during the second fiscal quarter of the period 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. Disclosure of Securities Lending Activities forClosed-End Management Investment Companies

Not applicable.

Item 13. Exhibits

(a)(1)	Registrant’s Code of Ethics – Not applicable (please see Item 2).
(a)(2)(i)	Treasurer’s Section 302 certification.
(a)(2)(ii)	President’s Section 302 certification.
(b)	Combined Section 906 certification.

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.

Tax-ManagedMulti-Cap Growth Portfolio

By:	/s/ Edward J. Perkin
	Edward J. Perkin
	President
Date:	June 24, 2019

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

By:	/s/ James F. Kirchner
	James F. Kirchner
	Treasurer
Date:	June 24, 2019
By:	/s/ Edward J. Perkin
	Edward J. Perkin
	President
Date:	June 24, 2019