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: 811-09013

Eaton Vance Senior Income Trust

(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)

June 30

Date of Fiscal Year End

December 31, 2019

Date of Reporting Period

Item 1. Reports to Stockholders

Eaton Vance

Senior Income Trust (EVF)

Semiannual Report

December 31, 2019

Important Note. Beginning on January 1, 2021, as permitted by regulations adopted by the Securities and Exchange Commission, paper copies of the Fund’s annual and semi-annual shareholder reports will no longer be sent by mail unless you specifically request paper copies of the reports. Instead, the reports will be made available on the Fund’s website (funds.eatonvance.com/closed-end-fund-and-term-trust-documents.php), and you will be notified by mail each time a report is posted and provided with a website address to access the report.

If you already elected to receive shareholder reports electronically, you will not be affected by this change and you need not take any action. If you hold shares at the Fund’s transfer agent, American Stock Transfer & Trust Company, LLC (“AST”), you may elect to receive shareholder reports and other communications from the Fund electronically by contacting AST. If you own your shares through a financial intermediary (such as a broker-dealer or bank), you must contact your financial intermediary to sign up.

You may elect to receive all future Fund shareholder reports in paper free of charge. If you hold shares at AST, you can inform AST that you wish to continue receiving paper copies of your shareholder reports by calling 1-866-439-6787. If you own these shares through a financial intermediary, you must contact your financial intermediary or follow instructions included with this disclosure, if applicable, to elect to continue to receive paper copies of your shareholder reports. Your election to receive reports in paper will apply to all funds held with AST or to all funds held through your financial intermediary, as applicable.

Commodity Futures Trading Commission Registration. Effective December 31, 2012, the Commodity Futures Trading Commission (“CFTC”) adopted certain regulatory changes that subject registered investment companies and advisers to regulation by the CFTC if a fund invests more than a prescribed level of its assets in certain CFTC-regulated instruments (including futures, certain options and swap agreements) or markets itself as providing investment exposure to such instruments. The Fund has claimed an exclusion from the definition of the term “commodity pool operator” under the Commodity Exchange Act. Accordingly, neither the Fund nor the adviser with respect to the operation of the Fund is subject to CFTC regulation. Because of its management of other strategies, the Fund’s adviser is registered with the CFTC as a commodity pool operator and a commodity trading advisor.

Fund shares are not insured by the FDIC and are not deposits or other obligations of, or guaranteed by, any depository institution. Shares are subject to investment risks, including possible loss of principal invested.

Semiannual Report December 31, 2019

Eaton Vance

Senior Income Trust

Table of Contents

Performance	2
Fund Profile	3
Endnotes and Additional Disclosures	4
Financial Statements	5
Annual Meeting of Shareholders	45
Officers and Trustees	46
Important Notices	47

Eaton Vance

Senior Income Trust

December 31, 2019

Performance^1,2

Portfolio Managers John Redding, Andrew N. Sveen, CFA, Catherine C. McDermott, William E. Holt, CFA and Daniel P. McElaney, CFA

% Average Annual Total Returns	Inception Date		Six Months			One Year			Five Years			Ten Years
Fund at NAV		10/30/1998		3.52	%		10.39	%		6.48	%		7.19	%
Fund at Market Price		—		7.12			14.23			7.12			6.72
S&P/LSTA Leveraged Loan Index		—		2.74	%		8.64	%		4.44	%		5.00	%
% Premium/Discount to NAV3
													–8.56	%
Distributions4
Total Distributions per share for the period												$	0.255
Distribution Rate at NAV													6.50	%
Distribution Rate at Market Price													7.11	%
% Total Leverage5
Auction Preferred Shares (APS)													9.15	%
Borrowings													26.28

See Endnotes and Additional Disclosures in this report.

Past performance is no guarantee of future results. Returns are historical and are calculated net of management fees and other expenses by determining the percentage change in net asset value (NAV) or market price (as applicable) with all distributions reinvested in accordance with the Fund’s Dividend Reinvestment Plan. Performance at market price will differ from performance at NAV due to variations in the Fund’s market price versus NAV, which may reflect factors such as fluctuations in supply and demand for Fund shares, changes in Fund distributions, shifting market expectations for the Fund’s future returns and distribution rates, and other considerations affecting the trading prices of closed-end funds. Investment return and principal value will fluctuate so that shares, when sold, may be worth more or less than their original cost. Performance for periods less than or equal to one year is cumulative. Performance is for the stated time period only; due to market volatility, current Fund performance may be lower or higher than the quoted return. For performance as of the most recent month-end, please refer to eatonvance.com.

2

Eaton Vance

Senior Income Trust

December 31, 2019

Fund Profile

Top 10 Issuers (% of total investments)⁶

Reynolds Group Holdings, Inc.	1.3	%
TransDigm, Inc.	1.2
Bausch Health Companies, Inc.	1.2
Asurion, LLC	1.2
Hyland Software, Inc.	0.9
Jaguar Holding Company II	0.9
Infor (US), Inc.	0.8
Calpine Corporation	0.8
Uber Technologies	0.8
Hub International Limited	0.8
Total	9.9	%

Top 10 Sectors (% of total investments)⁶

Electronics/Electrical	11.9	%
Health Care	8.7
Business Equipment and Services	7.5
Drugs	4.5
Leisure Goods/Activities/Movies	4.5
Chemicals and Plastics	4.3
Telecommunications	4.1
Oil and Gas	4.1
Insurance	4.1
Cable and Satellite Television	3.6
Total	57.3	%

Credit Quality (% of bonds, loans and asset-backed securities)⁷

See Endnotes and Additional Disclosures in this report.

3

Eaton Vance

Senior Income Trust

December 31, 2019

Endnotes and Additional Disclosures

¹  S&P/LSTA Leveraged Loan Index is an unmanaged index of the institutional leveraged loan market. S&P/LSTA Leveraged Loan indices are a product of S&P Dow Jones Indices LLC (“S&P DJI”) and have been licensed for use. S&P^® is a registered trademark of S&P DJI; Dow Jones^® is a registered trademark of Dow Jones Trademark Holdings LLC (“Dow Jones”); LSTA is a trademark of Loan Syndications and Trading Association, Inc. S&P DJI, Dow Jones, their respective affiliates and their third party licensors do not sponsor, endorse, sell or promote the Fund, will not have any liability with respect thereto and do not have any liability for any errors, omissions, or interruptions of the S&P Dow Jones Indices. Unless otherwise stated, index returns do not reflect the effect of any applicable sales charges, commissions, expenses, taxes or leverage, as applicable. It is not possible to invest directly in an index.

²  Performance results reflect the effects of leverage. Performance since inception for an index, if presented, is the performance since the Fund’s or oldest share class’ inception, as applicable. Included in the average annual total return at NAV for the five- and ten- year periods is the impact of the 2017 and 2019 tender and repurchase of a portion of the Fund’s APS at 95% and 92% of the Fund’s APS per share liquidation preference, respectively. Had these transactions not occurred, the total return at NAV would be lower for the Fund.

³  The shares of the Fund often trade at a discount or premium to their net asset value. The discount or premium may vary over time and may be higher or lower than what is quoted in this report. For up-to-date premium/discount information, please refer to https://funds.eatonvance.com/closed-end-fund-prices.php.

⁴  The Distribution Rate is based on the Fund’s last regular distribution per share in the period (annualized) divided by the Fund’s NAV or market price at the end of the period. The Fund’s distributions may be comprised of amounts characterized for federal income tax purposes as qualified and non-qualified ordinary dividends, capital gains and nondividend distributions, also known as return of capital. For additional information about nondividend distributions, please refer to Eaton Vance Closed-End Fund Distribution Notices (19a) posted on our website, eatonvance.com. The Fund will determine the federal income tax character of distributions paid to a shareholder after the end of the calendar year. This is reported on the IRS form 1099-DIV and provided to the shareholder shortly after each year-end. For information about the tax character of distributions made in prior calendar years, please refer to Performance-Tax Character of Distributions on the Fund’s webpage available at eatonvance.com. The Fund’s distributions are determined by the investment adviser based on its current assessment of the Fund’s long-term return potential. Fund distributions may be affected by numerous factors including changes in Fund performance, the cost of financing for leverage, portfolio holdings, realized and projected returns, and other factors. As portfolio and market conditions change, the rate of distributions paid by the Fund could change.

⁵  Leverage represents the liquidation value of the Fund’s APS and borrowings outstanding as a percentage of Fund net assets applicable to common shares plus APS and borrowings outstanding. Use of leverage creates an opportunity for income, but creates risks including greater price volatility. The cost of leverage rises and falls with changes in short-term interest rates. The Fund may be required to maintain prescribed asset coverage for its leverage and may be required to reduce its leverage at an inopportune time.

⁶  Excludes cash and cash equivalents.

⁷  Credit ratings are categorized using S&P Global Ratings (“S&P”). Ratings, which are subject to change, apply to the creditworthiness of the issuers of the underlying securities and not to the Fund or its shares. Credit ratings measure the quality of a bond based on the issuer’s creditworthiness, with ratings ranging from AAA, being the highest, to D, being the lowest based on S&P’s measures. Ratings of BBB or higher by S&P are considered to be investment- grade quality. Credit ratings are based largely on the ratings agency’s analysis at the time of rating. The rating assigned to any particular security is not necessarily a reflection of the issuer’s current financial condition and does not necessarily reflect its assessment of the volatility of a security’s market value or of the liquidity of an investment in the security. Holdings designated as “Not Rated” (if any) are not rated by S&P.

Fund profile subject to change due to active management.

   Important Notice to Shareholders

Effective November 1, 2019, the Fund is managed by John Redding, Andrew N. Sveen, Catherine C. McDermott, William E. Holt and Daniel P. McElaney.

4

Eaton Vance

Senior Income Trust

December 31, 2019

Portfolio of Investments (Unaudited)

Senior Floating-Rate Loans — 131.2%(1)
Borrower/Tranche Description		Principal Amount* (000’s omitted)		Value
Aerospace and Defense — 2.3%
Dynasty Acquisition Co., Inc.
Term Loan, 5.94%, (3 mo. USD LIBOR + 4.00%), Maturing April 6, 2026			243	$	245,443
IAP Worldwide Services, Inc.
Revolving Loan, 1.42%, (3 mo. USD LIBOR + 5.50%), Maturing July 19, 2021(2)			161		157,235
Term Loan - Second Lien, 8.44%, (3 mo. USD LIBOR + 6.50%), Maturing July 18, 2020(3)			210		167,807
TransDigm, Inc.
Term Loan, 4.30%, (1 mo. USD LIBOR + 2.50%), Maturing June 9, 2023			2,889		2,901,600
Term Loan, 4.30%, (1 mo. USD LIBOR + 2.50%), Maturing August 22, 2024			1,204		1,209,458
Wesco Aircraft Hardware Corp.
Term Loan, 4.30%, (1 mo. USD LIBOR + 2.50%), Maturing November 30, 2020			398		398,310
WP CPP Holdings, LLC
Term Loan, 5.68%, (3 mo. USD LIBOR + 3.75%), Maturing April 30, 2025			915		910,170
				$	5,990,023
Automotive — 3.3%
Adient US, LLC
Term Loan, 6.18%, (3 mo. USD LIBOR + 4.25%), Maturing May 6, 2024			672	$	676,523
American Axle and Manufacturing, Inc.
Term Loan, 4.07%, (USD LIBOR + 2.25%), Maturing April 6, 2024(4)			1,088		1,086,589
Autokiniton US Holdings, Inc.
Term Loan, 8.17%, (1 mo. USD LIBOR + 6.38%), Maturing May 22, 2025			369		354,600
Bright Bidco B.V.
Term Loan, 5.40%, (USD LIBOR + 3.50%), Maturing June 30, 2024(4)			732		436,348
Chassix, Inc.
Term Loan, 7.44%, (USD LIBOR + 5.50%), Maturing November 15, 2023(4)			637		589,225
Dayco Products, LLC
Term Loan, 6.16%, (3 mo. USD LIBOR + 4.25%), Maturing May 19, 2023			488		431,438
Garrett LX III S.a.r.l.
Term Loan, 2.75%, (3 mo. EURIBOR + 2.75%), Maturing September 27, 2025	EUR		184		207,456
Term Loan, 4.45%, (3 mo. USD LIBOR + 2.50%), Maturing September 27, 2025			123		123,322

Borrower/Tranche Description		Principal Amount* (000’s omitted)		Value
Automotive (continued)
IAA, Inc.
Term Loan, 4.06%, (1 mo. USD LIBOR + 2.25%), Maturing June 28, 2026			267	$	268,915
Panther BF Aggregator 2 L.P.
Term Loan, 5.30%, (1 mo. USD LIBOR + 3.50%), Maturing April 30, 2026			1,671		1,680,893
Tenneco, Inc.
Term Loan, 4.80%, (1 mo. USD LIBOR + 3.00%), Maturing October 1, 2025			1,683		1,650,602
Thor Industries, Inc.
Term Loan, 5.50%, (1 mo. USD LIBOR + 3.75%), Maturing February 1, 2026			509		511,380
TI Group Automotive Systems, LLC
Term Loan, 3.50%, (3 mo. EURIBOR + 2.75%, Floor 0.75%), Maturing June 30, 2022	EUR		359		403,767
Term Loan, 4.30%, (1 mo. USD LIBOR + 2.50%), Maturing June 30, 2022			430		431,882
				$	8,852,940
Beverage and Tobacco — 0.7%
Arterra Wines Canada, Inc.
Term Loan, 4.65%, (1 mo. USD LIBOR + 2.75%), Maturing December 15, 2023			1,190	$	1,191,143
Flavors Holdings, Inc.
Term Loan, 7.69%, (3 mo. USD LIBOR + 5.75%), Maturing April 3, 2020(3)			271		257,772
Term Loan - Second Lien, 11.94%, (3 mo. USD LIBOR + 10.00%), Maturing October 3, 2021(3)			500		475,000
				$	1,923,915
Brokerage / Securities Dealers / Investment Houses — 0.1%
OZ Management L.P.
Term Loan, 6.50%, (1 mo. USD LIBOR + 4.75%), Maturing April 10, 2023			59	$	58,573
Resolute Investment Managers, Inc.
Term Loan - Second Lien, 9.43%, (3 mo. USD LIBOR + 7.50%), Maturing April 30, 2023			250		249,375
				$	307,948
Building and Development — 4.1%
Advanced Drainage Systems, Inc.
Term Loan, 4.00%, (1 mo. USD LIBOR + 2.25%), Maturing July 31, 2026			139	$	140,853
American Builders & Contractors Supply Co., Inc.
Term Loan, 3.80%, (1 mo. USD LIBOR + 2.00%), Maturing January 15, 2027			1,122		1,127,448

5 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2019

Portfolio of Investments (Unaudited) — continued

Borrower/Tranche Description	Principal Amount* (000’s omitted)		Value
Building and Development (continued)
APi Group DE, Inc.
Term Loan, 4.30%, (1 mo. USD LIBOR + 2.50%), Maturing October 1, 2026		675	$	681,223
Beacon Roofing Supply, Inc.
Term Loan, 4.05%, (1 mo. USD LIBOR + 2.25%), Maturing January 2, 2025		270		271,792
Brookfield Property REIT, Inc.
Term Loan, 4.30%, (1 mo. USD LIBOR + 2.50%), Maturing August 27, 2025		444		442,153
Core & Main L.P.
Term Loan, 4.53%, (USD LIBOR + 2.75%), Maturing August 1, 2024(4)		517		516,949
CPG International, Inc.
Term Loan, 5.93%, (6 mo. USD LIBOR + 3.75%), Maturing May 5, 2024		911		915,054
Cushman & Wakefield U.S. Borrower, LLC
Term Loan, 5.05%, (1 mo. USD LIBOR + 3.25%), Maturing August 21, 2025		2,592		2,605,553
Henry Company, LLC
Term Loan, 5.80%, (1 mo. USD LIBOR + 4.00%), Maturing October 5, 2023		194		195,584
NCI Building Systems, Inc.
Term Loan, 5.49%, (1 mo. USD LIBOR + 3.75%), Maturing April 12, 2025		346		345,467
Quikrete Holdings, Inc.
Term Loan, 4.55%, (1 mo. USD LIBOR + 2.75%), Maturing November 15, 2023		1,202		1,209,542
RE/MAX International, Inc.
Term Loan, 4.55%, (1 mo. USD LIBOR + 2.75%), Maturing December 15, 2023		891		891,930
Summit Materials Companies I, LLC
Term Loan, 3.80%, (1 mo. USD LIBOR + 2.00%), Maturing November 21, 2024		294		295,746
Werner FinCo L.P.
Term Loan, 5.80%, (1 mo. USD LIBOR + 4.00%), Maturing July 24, 2024		538		537,992
WireCo WorldGroup, Inc.
Term Loan, 6.80%, (1 mo. USD LIBOR + 5.00%), Maturing September 30, 2023		266		253,558
Term Loan - Second Lien, 10.80%, (1 mo. USD LIBOR + 9.00%), Maturing September 30, 2024		575		534,750
			$	10,965,594
Business Equipment and Services — 10.9%
Adtalem Global Education, Inc.
Term Loan, 4.80%, (1 mo. USD LIBOR + 3.00%), Maturing April 11, 2025		172	$	172,662

Borrower/Tranche Description		Principal Amount* (000’s omitted)		Value
Business Equipment and Services (continued)
AlixPartners, LLP
Term Loan, 3.25%, (3 mo. EURIBOR + 3.25%), Maturing April 4, 2024	EUR		347	$	392,573
Term Loan, 4.55%, (1 mo. USD LIBOR + 2.75%), Maturing April 4, 2024			1,047		1,054,482
Allied Universal Holdco, LLC
Term Loan, 6.05%, (1 mo. USD LIBOR + 4.25%), Maturing July 10, 2026			1,069		1,077,296
Term Loan, 6.05%, (1 mo. USD LIBOR + 4.25%), Maturing July 10, 2026			106		106,663
Altran Technologies S.A.
Term Loan, 3.00%, (3 mo. EURIBOR + 3.00%), Maturing March 20, 2025	EUR		616		695,802
AppLovin Corporation
Term Loan, 5.30%, (1 mo. USD LIBOR + 3.50%), Maturing August 15, 2025			1,634		1,646,054
Belfor Holdings, Inc.
Term Loan, 5.69%, (1 mo. USD LIBOR + 4.00%), Maturing April 6, 2026			249		250,305
BidFair MergeRight, Inc.
Term Loan, 7.24%, (1 mo. USD LIBOR + 5.50%), Maturing January 15, 2027			300		297,750
Bracket Intermediate Holding Corp.
Term Loan, 6.35%, (3 mo. USD LIBOR + 4.25%), Maturing September 5, 2025			420		418,638
Brand Energy & Infrastructure Services, Inc.
Term Loan, 6.24%, (3 mo. USD LIBOR + 4.25%), Maturing June 21, 2024			244		243,402
Camelot U.S. Acquisition 1 Co.
Term Loan, 5.05%, (1 mo. USD LIBOR + 3.25%), Maturing October 31, 2026			700		705,104
Ceridian HCM Holding, Inc.
Term Loan, 4.80%, (1 mo. USD LIBOR + 3.00%), Maturing April 30, 2025			691		696,578
CM Acquisition Co.
Term Loan, 11.94%, (3 mo. USD LIBOR + 10.00%), Maturing July 26, 2023			128		124,316
Cypress Intermediate Holdings III, Inc.
Term Loan, 4.55%, (1 mo. USD LIBOR + 2.75%), Maturing April 29, 2024			1,202		1,209,291
Deerfield Dakota Holding, LLC
Term Loan, 5.05%, (1 mo. USD LIBOR + 3.25%), Maturing February 13, 2025			744		743,388
EAB Global, Inc.
Term Loan, 5.74%, (USD LIBOR + 3.75%), Maturing November 15, 2024(4)			614		616,365

6 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2019

Portfolio of Investments (Unaudited) — continued

Borrower/Tranche Description	Principal Amount* (000’s omitted)		Value
Business Equipment and Services (continued)
EIG Investors Corp.
Term Loan, 5.67%, (3 mo. USD LIBOR + 3.75%), Maturing February 9, 2023		1,375	$	1,363,870
Element Materials Technology Group US Holdings, Inc.
Term Loan, 5.44%, (3 mo. USD LIBOR + 3.50%), Maturing June 28, 2024		172		170,830
Garda World Security Corporation
Term Loan, 6.66%, (3 mo. USD LIBOR + 4.75%), Maturing October 30, 2026		975		981,906
IG Investment Holdings, LLC
Term Loan, 5.80%, (1 mo. USD LIBOR + 4.00%), Maturing May 23, 2025		1,114		1,118,605
IRI Holdings, Inc.
Term Loan, 6.30%, (1 mo. USD LIBOR + 4.50%), Maturing December 1, 2025		965		949,162
Iron Mountain, Inc.
Term Loan, 3.55%, (1 mo. USD LIBOR + 1.75%), Maturing January 2, 2026		418		417,211
KAR Auction Services, Inc.
Term Loan, 4.06%, (1 mo. USD LIBOR + 2.25%), Maturing September 19, 2026		299		301,928
Kronos Incorporated
Term Loan, 4.91%, (3 mo. USD LIBOR + 3.00%), Maturing November 1, 2023		2,772		2,789,503
KUEHG Corp.
Term Loan, 5.69%, (3 mo. USD LIBOR + 3.75%), Maturing February 21, 2025		1,425		1,430,345
Term Loan - Second Lien, 10.19%, (3 mo. USD LIBOR + 8.25%), Maturing August 18, 2025		200		200,000
Monitronics International, Inc.
Term Loan, 8.30%, (1 mo. USD LIBOR + 6.50%), Maturing March 29, 2024		745		624,007
PGX Holdings, Inc.
Term Loan, 7.05%, (1 mo. USD LIBOR + 5.25%), Maturing September 29, 2020		565		301,107
Pike Corporation
Term Loan, 5.05%, (1 mo. USD LIBOR + 3.25%), Maturing July 24, 2026		244		246,145
Pre-Paid Legal Services, Inc.
Term Loan, 5.05%, (1 mo. USD LIBOR + 3.25%), Maturing May 1, 2025		225		225,392
Prime Security Services Borrower, LLC
Term Loan, 4.94%, (1 mo. USD LIBOR + 3.25%), Maturing September 23, 2026		1,128		1,132,002
Prometric Holdings, Inc.
Term Loan, 4.79%, (1 mo. USD LIBOR + 3.00%), Maturing January 29, 2025		147		147,478

Borrower/Tranche Description		Principal Amount* (000’s omitted)		Value
Business Equipment and Services (continued)
Red Ventures, LLC
Term Loan, 4.80%, (1 mo. USD LIBOR + 3.00%), Maturing November 8, 2024			663	$	669,880
Sabre GLBL, Inc.
Term Loan, 3.80%, (1 mo. USD LIBOR + 2.00%), Maturing February 22, 2024			466		469,247
SMG US Midco 2, Inc.
Term Loan, 4.80%, (1 mo. USD LIBOR + 3.00%), Maturing January 23, 2025			123		123,580
Spin Holdco, Inc.
Term Loan, 5.25%, (3 mo. USD LIBOR + 3.25%), Maturing November 14, 2022			1,687		1,678,795
Techem Verwaltungsgesellschaft 675 mbH
Term Loan, 3.50%, (3 mo. EURIBOR + 3.50%), Maturing July 31, 2025	EUR		715		807,908
Tempo Acquisition, LLC
Term Loan, 4.55%, (1 mo. USD LIBOR + 2.75%), Maturing May 1, 2024			904		911,107
Vestcom Parent Holdings, Inc.
Term Loan, 5.80%, (1 mo. USD LIBOR + 4.00%), Maturing December 19, 2023			241		228,972
WASH Multifamily Laundry Systems, LLC
Term Loan, 5.05%, (1 mo. USD LIBOR + 3.25%), Maturing May 14, 2022			122		119,463
West Corporation
Term Loan, 5.43%, (3 mo. USD LIBOR + 3.50%), Maturing October 10, 2024			148		124,695
Term Loan, 5.93%, (3 mo. USD LIBOR + 4.00%), Maturing October 10, 2024			515		437,325
Zephyr Bidco Limited
Term Loan, 5.21%, (1 mo. GBP LIBOR + 4.50%), Maturing July 23, 2025	GBP		350		458,394
				$	28,879,526
Cable and Satellite Television — 4.9%
Altice France S.A.
Term Loan, 5.43%, (1 mo. USD LIBOR + 3.69%), Maturing January 31, 2026			346	$	346,670
Term Loan, 5.74%, (1 mo. USD LIBOR + 4.00%), Maturing August 14, 2026			696		700,400
CSC Holdings, LLC
Term Loan, 3.99%, (1 mo. USD LIBOR + 2.25%), Maturing July 17, 2025			1,702		1,706,239
Term Loan, 3.99%, (1 mo. USD LIBOR + 2.25%), Maturing January 15, 2026			471		473,088
Term Loan, 4.24%, (1 mo. USD LIBOR + 2.50%), Maturing April 15, 2027			593		596,450

7 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2019

Portfolio of Investments (Unaudited) — continued

Borrower/Tranche Description		Principal Amount* (000’s omitted)		Value
Cable and Satellite Television (continued)
Numericable Group S.A.
Term Loan, 3.00%, (3 mo. EURIBOR + 3.00%), Maturing July 31, 2025	EUR		219	$	243,988
Term Loan, 4.55%, (1 mo. USD LIBOR + 2.75%), Maturing July 31, 2025			878		872,930
Radiate Holdco, LLC
Term Loan, 4.80%, (1 mo. USD LIBOR + 3.00%), Maturing February 1, 2024			904		908,096
Telenet Financing USD, LLC
Term Loan, 3.99%, (1 mo. USD LIBOR + 2.25%), Maturing August 15, 2026			1,375		1,384,884
Virgin Media Bristol, LLC
Term Loan, 4.24%, (1 mo. USD LIBOR + 2.50%), Maturing January 31, 2028			2,050		2,065,375
Virgin Media SFA Finance Limited
Term Loan, 2.50%, (6 mo. EURIBOR + 2.50%), Maturing January 31, 2029	EUR		575		647,436
Ziggo B.V.
Term Loan, 3.00%, (3 mo. EURIBOR + 3.00%), Maturing January 31, 2029	EUR		1,075		1,207,335
Ziggo Secured Finance Partnership
Term Loan, 4.24%, (1 mo. USD LIBOR + 2.50%), Maturing April 15, 2025			1,700		1,703,896
				$	12,856,787
Chemicals and Plastics — 6.5%
Alpha 3 B.V.
Term Loan, 4.94%, (3 mo. USD LIBOR + 3.00%), Maturing January 31, 2024			643	$	645,453
Aruba Investments, Inc.
Term Loan, 5.05%, (1 mo. USD LIBOR + 3.25%), Maturing February 2, 2022			434		434,903
Axalta Coating Systems US Holdings, Inc.
Term Loan, 3.69%, (3 mo. USD LIBOR + 1.75%), Maturing June 1, 2024			1,249		1,253,038
Chemours Company (The)
Term Loan, 2.50%, (3 mo. EURIBOR + 2.00%, Floor 0.50%), Maturing April 3, 2025	EUR		285		315,805
Emerald Performance Materials, LLC
Term Loan, 5.30%, (1 mo. USD LIBOR + 3.50%), Maturing August 1, 2021			235		233,906
Ferro Corporation
Term Loan, 4.19%, (3 mo. USD LIBOR + 2.25%), Maturing February 14, 2024			158		158,236
Term Loan, 4.19%, (3 mo. USD LIBOR + 2.25%), Maturing February 14, 2024			161		161,675
Term Loan, 4.19%, (3 mo. USD LIBOR + 2.25%), Maturing February 14, 2024			195		194,900

Borrower/Tranche Description		Principal Amount* (000’s omitted)		Value
Chemicals and Plastics (continued)
Flint Group GmbH
Term Loan, 4.94%, (3 mo. USD LIBOR + 3.00%), Maturing September 7, 2021			71	$	61,746
Flint Group US, LLC
Term Loan, 4.94%, (3 mo. USD LIBOR + 3.00%), Maturing September 7, 2021			427		373,512
Gemini HDPE, LLC
Term Loan, 4.43%, (3 mo. USD LIBOR + 2.50%), Maturing August 7, 2024			740		743,870
H.B. Fuller Company
Term Loan, 3.76%, (1 mo. USD LIBOR + 2.00%), Maturing October 20, 2024			760		762,974
Hexion, Inc.
Term Loan, 4.00%, (3 mo. EURIBOR + 4.00%), Maturing July 1, 2026	EUR		700		788,134
Term Loan, 5.60%, (3 mo. USD LIBOR + 3.50%), Maturing July 1, 2026			348		350,418
INEOS Enterprises Holdings Limited
Term Loan, 4.00%, (3 mo. EURIBOR + 4.00%), Maturing August 28, 2026	EUR		100		113,011
INEOS Enterprises Holdings US Finco, LLC
Term Loan, 5.91%, (3 mo. USD LIBOR + 4.00%), Maturing August 31, 2026			125		125,350
INEOS Finance PLC
Term Loan, 2.50%, (1 mo. EURIBOR + 2.00%, Floor 0.50%), Maturing March 31, 2024	EUR		1,421		1,596,425
Kraton Polymers, LLC
Term Loan, 4.30%, (1 mo. USD LIBOR + 2.50%), Maturing March 5, 2025			362		361,463
Messer Industries GmbH
Term Loan, 4.44%, (3 mo. USD LIBOR + 2.50%), Maturing March 1, 2026			695		699,309
Minerals Technologies, Inc.
Term Loan, 4.06%, (USD LIBOR + 2.25%), Maturing February 14, 2024(4)			411		413,478
Momentive Performance Materials, Inc.
Term Loan, 5.05%, (1 mo. USD LIBOR + 3.25%), Maturing May 15, 2024			224		222,616
Orion Engineered Carbons GmbH
Term Loan, 2.25%, (3 mo. EURIBOR + 2.25%), Maturing July 25, 2024	EUR		360		406,526
Term Loan, 3.94%, (3 mo. USD LIBOR + 2.00%), Maturing July 25, 2024			475		476,282
PMHC II, Inc.
Term Loan, 5.44%, (3 mo. USD LIBOR + 3.50%), Maturing March 31, 2025			820		730,056

8 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2019

Portfolio of Investments (Unaudited) — continued

Borrower/Tranche Description		Principal Amount* (000’s omitted)		Value
Chemicals and Plastics (continued)
PQ Corporation
Term Loan, 4.43%, (3 mo. USD LIBOR + 2.50%), Maturing February 8, 2025			1,091	$	1,098,104
Pregis TopCo Corporation
Term Loan, 5.80%, (1 mo. USD LIBOR + 4.00%), Maturing July 31, 2026			300		300,562
Spectrum Holdings III Corp.
Term Loan, 5.05%, (1 mo. USD LIBOR + 3.25%), Maturing January 31, 2025			156		145,902
Starfruit Finco B.V.
Term Loan, 3.75%, (3 mo. EURIBOR + 3.75%), Maturing October 1, 2025	EUR		200		226,677
Term Loan, 4.96%, (1 mo. USD LIBOR + 3.25%), Maturing October 1, 2025			1,306		1,308,915
Tronox Finance, LLC
Term Loan, 4.61%, (USD LIBOR + 2.75%), Maturing September 23, 2024(4)			1,370		1,374,294
Univar, Inc.
Term Loan, 4.05%, (1 mo. USD LIBOR + 2.25%), Maturing July 1, 2024			988		993,380
Venator Materials Corporation
Term Loan, 4.80%, (1 mo. USD LIBOR + 3.00%), Maturing August 8, 2024			171		170,421
				$	17,241,341
Conglomerates — 0.3%
Kronos Acquisition Holdings, Inc.
Term Loan, 8.80%, (1 mo. USD LIBOR + 7.00%), Maturing May 15, 2023			744	$	738,792
Penn Engineering & Manufacturing Corp.
Term Loan, 4.55%, (1 mo. USD LIBOR + 2.75%), Maturing June 27, 2024			104		104,373
				$	843,165
Containers and Glass Products — 3.2%
Berlin Packaging, LLC
Term Loan, 4.72%, (USD LIBOR + 3.00%), Maturing November 7, 2025(4)			123	$	122,553
Berry Global, Inc.
Term Loan, 3.72%, (1 mo. USD LIBOR + 2.00%), Maturing October 1, 2022			384		386,320
Term Loan, 2.50%, (1 mo. EURIBOR + 2.50%), Maturing July 1, 2026	EUR		149		167,877
Term Loan, 4.22%, (1 mo. USD LIBOR + 2.50%), Maturing July 1, 2026			448		449,771

Borrower/Tranche Description	Principal Amount* (000’s omitted)		Value
Containers and Glass Products (continued)
BWAY Holding Company
Term Loan, 5.23%, (3 mo. USD LIBOR + 3.25%), Maturing April 3, 2024		1,200	$	1,197,838
Consolidated Container Company, LLC
Term Loan, 4.55%, (1 mo. USD LIBOR + 2.75%), Maturing May 22, 2024		171		171,980
Flex Acquisition Company, Inc.
Term Loan, 5.09%, (USD LIBOR + 3.00%), Maturing December 29, 2023(4)		1,434		1,425,612
Term Loan, 5.35%, (3 mo. USD LIBOR + 3.25%), Maturing June 29, 2025		685		681,367
Libbey Glass, Inc.
Term Loan, 4.71%, (1 mo. USD LIBOR + 3.00%), Maturing April 9, 2021		455		373,621
Pelican Products, Inc.
Term Loan, 5.24%, (1 mo. USD LIBOR + 3.50%), Maturing May 1, 2025		296		271,860
Reynolds Group Holdings, Inc.
Term Loan, 4.55%, (1 mo. USD LIBOR + 2.75%), Maturing February 5, 2023		2,465		2,476,343
Ring Container Technologies Group, LLC
Term Loan, 4.55%, (1 mo. USD LIBOR + 2.75%), Maturing October 31, 2024		389		390,447
Trident TPI Holdings, Inc.
Term Loan, 4.80%, (1 mo. USD LIBOR + 3.00%), Maturing October 17, 2024		368		358,698
			$	8,474,287
Cosmetics / Toiletries — 0.3%
KIK Custom Products, Inc.
Term Loan, 5.79%, (1 mo. USD LIBOR + 4.00%), Maturing May 15, 2023		876	$	863,455
			$	863,455
Drugs — 6.1%
Akorn, Inc.
Term Loan, 11.81%, (11.06% cash (1 mo. USD LIBOR + 9.25%), 0.75% PIK), Maturing April 16, 2021		965	$	926,810
Albany Molecular Research, Inc.
Term Loan, 5.05%, (1 mo. USD LIBOR + 3.25%), Maturing August 30, 2024		318		317,489
Alkermes, Inc.
Term Loan, 3.99%, (1 mo. USD LIBOR + 2.25%), Maturing March 23, 2023		187		186,067

9 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2019

Portfolio of Investments (Unaudited) — continued

Borrower/Tranche Description		Principal Amount* (000’s omitted)		Value
Drugs (continued)
Amneal Pharmaceuticals, LLC
Term Loan, 5.31%, (1 mo. USD LIBOR + 3.50%), Maturing May 4, 2025			1,649	$	1,491,962
Arbor Pharmaceuticals, Inc.
Term Loan, 6.94%, (3 mo. USD LIBOR + 5.00%), Maturing July 5, 2023			1,005		892,206
Bausch Health Companies, Inc.
Term Loan, 4.74%, (1 mo. USD LIBOR + 3.00%), Maturing June 2, 2025			2,583		2,602,142
Catalent Pharma Solutions, Inc.
Term Loan, 4.05%, (1 mo. USD LIBOR + 2.25%), Maturing May 18, 2026			372		374,514
Endo Luxembourg Finance Company I S.a.r.l.
Term Loan, 6.06%, (1 mo. USD LIBOR + 4.25%), Maturing April 29, 2024			2,860		2,724,564
Horizon Therapeutics USA, Inc.
Term Loan, 3.94%, (1 mo. USD LIBOR + 2.25%), Maturing May 22, 2026			976		984,112
Jaguar Holding Company II
Term Loan, 4.30%, (1 mo. USD LIBOR + 2.50%), Maturing August 18, 2022			3,210		3,231,122
Mallinckrodt International Finance S.A.
Term Loan, 4.69%, (3 mo. USD LIBOR + 2.75%), Maturing September 24, 2024			1,291		1,052,638
Term Loan, 4.91%, (3 mo. USD LIBOR + 3.00%), Maturing February 24, 2025			1,462		1,194,211
Nidda Healthcare Holding AG
Term Loan, Maturing August 21, 2024(5)	EUR		275		309,078
				$	16,286,915
Ecological Services and Equipment — 1.2%
Advanced Disposal Services, Inc.
Term Loan, 3.85%, (1 week USD LIBOR + 2.25%), Maturing November 10, 2023			938	$	942,857
EnergySolutions, LLC
Term Loan, 5.69%, (3 mo. USD LIBOR + 3.75%), Maturing May 9, 2025			864		818,742
GFL Environmental, Inc.
Term Loan, 4.80%, (1 mo. USD LIBOR + 3.00%), Maturing May 30, 2025			1,133		1,136,200
Terrapure Environmental Ltd.
Term Loan, Maturing November 25, 2026(5)			200		201,000
US Ecology Holdings, Inc.
Term Loan, 4.30%, (1 mo. USD LIBOR + 2.50%), Maturing August 14, 2026			125		126,133
				$	3,224,932

Borrower/Tranche Description		Principal Amount* (000’s omitted)		Value
Electronics / Electrical — 18.2%
Almonde, Inc.
Term Loan, 5.70%, (6 mo. USD LIBOR + 3.50%), Maturing June 13, 2024			1,677	$	1,669,568
Applied Systems, Inc.
Term Loan, 5.19%, (3 mo. USD LIBOR + 3.25%), Maturing September 19, 2024			1,347		1,354,280
Term Loan - Second Lien, 8.94%, (3 mo. USD LIBOR + 7.00%), Maturing September 19, 2025			1,225		1,257,156
Aptean, Inc.
Term Loan, 6.19%, (3 mo. USD LIBOR + 4.25%), Maturing April 23, 2026			248		247,350
Term Loan - Second Lien, 10.44%, (3 mo. USD LIBOR + 8.50%), Maturing April 23, 2027			650		643,500
Avast Software B.V.
Term Loan, 4.19%, (3 mo. USD LIBOR + 2.25%), Maturing September 29, 2023			257		259,345
Banff Merger Sub, Inc.
Term Loan, 4.75%, (3 mo. EURIBOR + 4.75%), Maturing October 2, 2025	EUR		124		139,750
Term Loan, 6.05%, (1 mo. USD LIBOR + 4.25%), Maturing October 2, 2025			1,510		1,494,888
Barracuda Networks, Inc.
Term Loan, 5.16%, (3 mo. USD LIBOR + 3.25%), Maturing February 12, 2025			1,136		1,144,054
Canyon Valor Companies, Inc.
Term Loan, 4.55%, (1 mo. USD LIBOR + 2.75%), Maturing June 16, 2023			790		790,799
CDW, LLC
Term Loan, 3.55%, (1 mo. USD LIBOR + 1.75%), Maturing October 13, 2026			598		602,938
Celestica, Inc.
Term Loan, 4.29%, (1 mo. USD LIBOR + 2.50%), Maturing June 27, 2025			149		148,639
Cohu, Inc.
Term Loan, 4.80%, (1 mo. USD LIBOR + 3.00%), Maturing October 1, 2025			346		343,897
CommScope, Inc.
Term Loan, 5.05%, (1 mo. USD LIBOR + 3.25%), Maturing April 6, 2026			823		829,311
CPI International, Inc.
Term Loan, 5.30%, (1 mo. USD LIBOR + 3.50%), Maturing July 26, 2024			318		306,171
Datto, Inc.
Term Loan, 6.05%, (1 mo. USD LIBOR + 4.25%), Maturing April 2, 2026			174		175,757
ECI Macola/Max Holding, LLC
Term Loan, 6.19%, (3 mo. USD LIBOR + 4.25%), Maturing September 27, 2024			368		368,834

10 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2019

Portfolio of Investments (Unaudited) — continued

Borrower/Tranche Description		Principal Amount* (000’s omitted)		Value
Electronics / Electrical (continued)
Electro Rent Corporation
Term Loan, 6.94%, (3 mo. USD LIBOR + 5.00%), Maturing January 31, 2024			582	$	586,850
Energizer Holdings, Inc.
Term Loan, 4.00%, (1 mo. USD LIBOR + 2.25%), Maturing December 17, 2025			165		166,081
Epicor Software Corporation
Term Loan, 5.05%, (1 mo. USD LIBOR + 3.25%), Maturing June 1, 2022			2,118		2,134,727
EXC Holdings III Corp.
Term Loan, 5.44%, (3 mo. USD LIBOR + 3.50%), Maturing December 2, 2024			221		220,219
Financial & Risk US Holdings, Inc.
Term Loan, 5.05%, (1 mo. USD LIBOR + 3.25%), Maturing October 1, 2025			569		574,705
Flexera Software, LLC
Term Loan, 5.30%, (1 mo. USD LIBOR + 3.50%), Maturing February 26, 2025			147		148,045
GlobalLogic Holdings, Inc.
Term Loan, 5.05%, (1 mo. USD LIBOR + 3.25%), Maturing August 1, 2025			194		195,906
Hyland Software, Inc.
Term Loan, 5.30%, (1 mo. USD LIBOR + 3.50%), Maturing July 1, 2024			1,726		1,741,996
Term Loan - Second Lien, 8.80%, (1 mo. USD LIBOR + 7.00%), Maturing July 7, 2025			2,031		2,061,334
Infoblox, Inc.
Term Loan, 6.30%, (1 mo. USD LIBOR + 4.50%), Maturing November 7, 2023			883		887,668
Infor (US), Inc.
Term Loan, 4.69%, (3 mo. USD LIBOR + 2.75%), Maturing February 1, 2022			3,273		3,291,007
Informatica, LLC
Term Loan, 3.50%, (3 mo. EURIBOR + 3.50%), Maturing August 5, 2022	EUR		147		166,624
Term Loan, 5.05%, (1 mo. USD LIBOR + 3.25%), Maturing August 5, 2022			2,073		2,084,214
MA FinanceCo., LLC
Term Loan, 4.05%, (1 mo. USD LIBOR + 2.25%), Maturing November 19, 2021			1,323		1,334,031
Term Loan, 4.30%, (1 mo. USD LIBOR + 2.50%), Maturing June 21, 2024			222		222,843
MACOM Technology Solutions Holdings, Inc.
Term Loan, 4.05%, (1 mo. USD LIBOR + 2.25%), Maturing May 17, 2024			577		552,648
Microchip Technology Incorporated
Term Loan, 3.80%, (1 mo. USD LIBOR + 2.00%), Maturing May 29, 2025			704		711,285

Borrower/Tranche Description	Principal Amount* (000’s omitted)		Value
Electronics / Electrical (continued)
MKS Instruments, Inc.
Term Loan, 3.55%, (1 mo. USD LIBOR + 1.75%), Maturing February 2, 2026		165	$	165,289
MTS Systems Corporation
Term Loan, 5.05%, (1 mo. USD LIBOR + 3.25%), Maturing July 5, 2023		234		235,754
NCR Corporation
Term Loan, 4.30%, (1 mo. USD LIBOR + 2.50%), Maturing August 28, 2026		449		451,680
Renaissance Holding Corp.
Term Loan, 5.05%, (1 mo. USD LIBOR + 3.25%), Maturing May 30, 2025		566		565,136
Term Loan - Second Lien, 8.80%, (1 mo. USD LIBOR + 7.00%), Maturing May 29, 2026		75		70,312
Seattle Spinco, Inc.
Term Loan, 4.30%, (1 mo. USD LIBOR + 2.50%), Maturing June 21, 2024		1,499		1,504,912
SGS Cayman L.P.
Term Loan, 7.32%, (3 mo. USD LIBOR + 5.38%), Maturing April 23, 2021		187		184,995
SkillSoft Corporation
Term Loan, 6.95%, (6 mo. USD LIBOR + 4.75%), Maturing April 28, 2021		2,223		1,730,157
SolarWinds Holdings, Inc.
Term Loan, 4.55%, (1 mo. USD LIBOR + 2.75%), Maturing February 5, 2024		907		914,620
Solera, LLC
Term Loan, 4.55%, (1 mo. USD LIBOR + 2.75%), Maturing March 3, 2023		1,106		1,109,511
Sparta Systems, Inc.
Term Loan, 5.44%, (3 mo. USD LIBOR + 3.50%), Maturing August 21, 2024		574		498,974
SS&C Technologies Holdings Europe S.a.r.l.
Term Loan, 4.05%, (1 mo. USD LIBOR + 2.25%), Maturing April 16, 2025		520		523,880
SS&C Technologies, Inc.
Term Loan, 4.05%, (1 mo. USD LIBOR + 2.25%), Maturing April 16, 2025		750		755,578
SurveyMonkey, Inc.
Term Loan, 5.38%, (1 week USD LIBOR + 3.75%), Maturing October 10, 2025		471		472,473
Sutherland Global Services, Inc.
Term Loan, 7.32%, (3 mo. USD LIBOR + 5.38%), Maturing April 23, 2021		802		794,727
Switch, Ltd.
Term Loan, 4.05%, (1 mo. USD LIBOR + 2.25%), Maturing June 27, 2024		122		122,675

11 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2019

Portfolio of Investments (Unaudited) — continued

Borrower/Tranche Description	Principal Amount* (000’s omitted)		Value
Electronics / Electrical (continued)
Tibco Software, Inc.
Term Loan, 5.71%, (1 mo. USD LIBOR + 4.00%), Maturing June 30, 2026		569	$	572,099
TriTech Software Systems
Term Loan, 5.55%, (1 mo. USD LIBOR + 3.75%), Maturing August 29, 2025		396		379,500
TTM Technologies, Inc.
Term Loan, 4.19%, (1 mo. USD LIBOR + 2.50%), Maturing September 28, 2024		127		127,957
Uber Technologies, Inc.
Term Loan, 5.30%, (1 mo. USD LIBOR + 3.50%), Maturing July 13, 2023		2,009		2,010,637
Term Loan, 5.74%, (1 mo. USD LIBOR + 4.00%), Maturing April 4, 2025		1,208		1,211,634
Ultimate Software Group, Inc. (The)
Term Loan, 5.55%, (1 mo. USD LIBOR + 3.75%), Maturing May 4, 2026		773		778,217
Ultra Clean Holdings, Inc.
Term Loan, 6.30%, (1 mo. USD LIBOR + 4.50%), Maturing August 27, 2025		364		364,969
Verifone Systems, Inc.
Term Loan, 5.90%, (3 mo. USD LIBOR + 4.00%), Maturing August 20, 2025		570		564,173
Veritas Bermuda, Ltd.
Term Loan, 6.32%, (USD LIBOR + 4.50%), Maturing January 27, 2023(4)		1,031		996,613
Vero Parent, Inc.
Term Loan, 8.16%, (3 mo. USD LIBOR + 6.25%), Maturing August 16, 2024		1,198		1,152,681
Vungle, Inc.
Term Loan, 7.30%, (1 mo. USD LIBOR + 5.50%), Maturing September 30, 2026		324		321,351
Western Digital Corporation
Term Loan, 3.45%, (1 mo. USD LIBOR + 1.75%), Maturing April 29, 2023		708		712,908
			$	48,149,832
Equipment Leasing — 0.1%
IBC Capital Limited
Term Loan, 5.65%, (3 mo. USD LIBOR + 3.75%), Maturing September 11, 2023		270	$	270,863
			$	270,863
Financial Intermediaries — 4.4%
Apollo Commercial Real Estate Finance, Inc.
Term Loan, 4.49%, (1 mo. USD LIBOR + 2.75%), Maturing May 15, 2026		199	$	199,995

Borrower/Tranche Description		Principal Amount* (000’s omitted)		Value
Financial Intermediaries (continued)
Aretec Group, Inc.
Term Loan, 6.05%, (1 mo. USD LIBOR + 4.25%), Maturing October 1, 2025			2,358	$	2,334,827
Citco Funding, LLC
Term Loan, 4.30%, (1 mo. USD LIBOR + 2.50%), Maturing September 28, 2023			1,891		1,891,841
Claros Mortgage Trust, Inc.
Term Loan, 4.96%, (1 mo. USD LIBOR + 3.25%), Maturing August 9, 2026			349		351,743
Ditech Holding Corporation
Term Loan, 0.00%, Maturing June 30, 2022(6)			1,397		578,968
EIG Management Company, LLC
Term Loan, 5.55%, (1 mo. USD LIBOR + 3.75%), Maturing February 22, 2025			123		123,043
Evergood 4 ApS
Term Loan, 3.75%, (3 mo. EURIBOR + 3.75%), Maturing February 6, 2025	EUR		325		366,994
Focus Financial Partners, LLC
Term Loan, 4.30%, (1 mo. USD LIBOR + 2.50%), Maturing July 3, 2024			1,334		1,345,319
Franklin Square Holdings L.P.
Term Loan, 4.06%, (1 mo. USD LIBOR + 2.25%), Maturing August 1, 2025			247		247,801
Greenhill & Co., Inc.
Term Loan, 4.99%, (1 mo. USD LIBOR + 3.25%), Maturing April 12, 2024			512		506,116
GreenSky Holdings, LLC
Term Loan, 5.06%, (1 mo. USD LIBOR + 3.25%), Maturing March 31, 2025			639		640,222
Guggenheim Partners, LLC
Term Loan, 4.55%, (1 mo. USD LIBOR + 2.75%), Maturing July 21, 2023			503		503,813
Harbourvest Partners, LLC
Term Loan, 3.99%, (1 mo. USD LIBOR + 2.25%), Maturing March 3, 2025			475		477,244
LPL Holdings, Inc.
Term Loan, 3.54%, (1 mo. USD LIBOR + 1.75%), Maturing November 12, 2026			600		604,625
Ocwen Loan Servicing, LLC
Term Loan, 6.80%, (1 mo. USD LIBOR + 5.00%), Maturing December 7, 2020			128		127,541
Starwood Property Trust, Inc.
Term Loan, 4.30%, (1 mo. USD LIBOR + 2.50%), Maturing July 27, 2026			249		251,398
StepStone Group L.P.
Term Loan, 5.84%, (2 mo. USD LIBOR + 4.00%), Maturing March 27, 2025			295		294,382

12 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2019

Portfolio of Investments (Unaudited) — continued

Borrower/Tranche Description		Principal Amount* (000’s omitted)		Value
Financial Intermediaries (continued)
Victory Capital Holdings, Inc.
Term Loan, 5.35%, (3 mo. USD LIBOR + 3.25%), Maturing July 1, 2026			563	$	567,292
Virtus Investment Partners, Inc.
Term Loan, 3.94%, (1 mo. USD LIBOR + 2.25%), Maturing June 1, 2024			254		255,536
				$	11,668,700
Food Products — 4.2%
Alphabet Holding Company, Inc.
Term Loan, 5.30%, (1 mo. USD LIBOR + 3.50%), Maturing September 26, 2024			1,124	$	1,086,655
Atkins Nutritionals Holdings II, Inc.
Term Loan, 5.73%, (3 mo. USD LIBOR + 3.75%), Maturing July 7, 2024			175		177,188
B&G Foods, Inc.
Term Loan, 4.30%, (1 mo. USD LIBOR + 2.50%), Maturing October 10, 2026			125		125,934
Badger Buyer Corp.
Term Loan, 5.30%, (1 mo. USD LIBOR + 3.50%), Maturing September 30, 2024			171		153,101
CHG PPC Parent, LLC
Term Loan, 3.50%, (1 mo. EURIBOR + 3.50%), Maturing March 31, 2025	EUR		1,375		1,554,869
Term Loan, 4.55%, (1 mo. USD LIBOR + 2.75%), Maturing March 31, 2025			222		222,733
Del Monte Foods, Inc.
Term Loan, 5.16%, (3 mo. USD LIBOR + 3.25%), Maturing February 18, 2021			818		730,908
Dole Food Company, Inc.
Term Loan, 4.53%, (1 mo. USD LIBOR + 2.75%), Maturing April 6, 2024			773		772,954
Froneri International PLC
Term Loan, 2.13%, (1 mo. EURIBOR + 2.13%), Maturing January 31, 2025	EUR		1,200		1,351,241
Hearthside Food Solutions, LLC
Term Loan, 5.49%, (1 mo. USD LIBOR + 3.69%), Maturing May 23, 2025			840		833,952
Term Loan, 5.80%, (1 mo. USD LIBOR + 4.00%), Maturing May 23, 2025			198		198,000
HLF Financing S.a.r.l.
Term Loan, 4.55%, (1 mo. USD LIBOR + 2.75%), Maturing August 18, 2025			494		496,527
Jacobs Douwe Egberts International B.V.
Term Loan, 2.25%, (3 mo. EURIBOR + 1.75%, Floor 0.50%), Maturing November 1, 2025	EUR		117		132,745
Term Loan, 3.75%, (1 mo. USD LIBOR + 2.00%), Maturing November 1, 2025			681		684,897

Borrower/Tranche Description		Principal Amount* (000’s omitted)		Value
Food Products (continued)
JBS USA Lux S.A.
Term Loan, 3.80%, (1 mo. USD LIBOR + 2.00%), Maturing May 1, 2026			1,935	$	1,951,446
Nomad Foods Europe Midco Limited
Term Loan, 3.99%, (1 mo. USD LIBOR + 2.25%), Maturing May 15, 2024			566		568,562
				$	11,041,712
Food Service — 1.9%
1011778 B.C. Unlimited Liability Company
Term Loan, 3.55%, (1 mo. USD LIBOR + 1.75%), Maturing November 19, 2026			2,675	$	2,681,671
IRB Holding Corp.
Term Loan, 5.22%, (3 mo. USD LIBOR + 3.25%), Maturing February 5, 2025			887		892,322
NPC International, Inc.
Term Loan, 5.43%, (3 mo. USD LIBOR + 3.50%), Maturing April 19, 2024			414		193,099
Restaurant Technologies, Inc.
Term Loan, 5.05%, (1 mo. USD LIBOR + 3.25%), Maturing October 1, 2025			99		99,743
US Foods, Inc.
Term Loan, 3.55%, (1 mo. USD LIBOR + 1.75%), Maturing June 27, 2023			393		394,699
Term Loan, 3.80%, (1 mo. USD LIBOR + 2.00%), Maturing September 13, 2026			773		777,323
				$	5,038,857
Food / Drug Retailers — 0.9%
Albertsons, LLC
Term Loan, 4.55%, (1 mo. USD LIBOR + 2.75%), Maturing November 17, 2025			183	$	185,087
Term Loan, 4.55%, (1 mo. USD LIBOR + 2.75%), Maturing August 17, 2026			1,485		1,500,189
Allsup’s Convenience Stores, Inc.
Term Loan, 8.00%, (1 mo. USD LIBOR + 6.25%), Maturing November 18, 2024			300		299,250
Diplomat Pharmacy, Inc.
Term Loan, 6.41%, (3 mo. USD LIBOR + 4.50%), Maturing December 20, 2024			218		212,386
L1R HB Finance Limited
Term Loan, 4.25%, (3 mo. EURIBOR + 4.25%), Maturing August 9, 2024	EUR		200		135,869
Term Loan, 6.04%, (3 mo. GBP LIBOR + 5.25%), Maturing September 2, 2024	GBP		200		160,446
				$	2,493,227

13 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2019

Portfolio of Investments (Unaudited) — continued

Borrower/Tranche Description		Principal Amount* (000’s omitted)		Value
Health Care — 12.4%
Acadia Healthcare Company, Inc.
Term Loan, 4.30%, (1 mo. USD LIBOR + 2.50%), Maturing February 11, 2022			114	$	114,669
ADMI Corp.
Term Loan, 4.55%, (1 mo. USD LIBOR + 2.75%), Maturing April 30, 2025			813		815,164
Alliance Healthcare Services, Inc.
Term Loan, 6.30%, (1 mo. USD LIBOR + 4.50%), Maturing October 24, 2023			380		347,700
Term Loan - Second Lien, 11.80%, (1 mo. USD LIBOR + 10.00%), Maturing April 24, 2024			225		192,375
athenahealth, Inc.
Term Loan, 6.40%, (3 mo. USD LIBOR + 4.50%), Maturing February 11, 2026			893		899,197
Athletico Management, LLC
Term Loan, 5.24%, (1 mo. USD LIBOR + 3.50%), Maturing October 31, 2025			248		248,119
Avantor, Inc.
Term Loan, 4.80%, (1 mo. USD LIBOR + 3.00%), Maturing November 21, 2024			208		209,343
BioClinica, Inc.
Term Loan, 6.06%, (1 mo. USD LIBOR + 4.25%), Maturing October 20, 2023			704		686,323
BW NHHC Holdco, Inc.
Term Loan, 6.91%, (3 mo. USD LIBOR + 5.00%), Maturing May 15, 2025			1,068		880,997
Carestream Dental Equipment, Inc.
Term Loan, 5.05%, (1 mo. USD LIBOR + 3.25%), Maturing September 1, 2024			435		425,590
Certara L.P.
Term Loan, 5.44%, (3 mo. USD LIBOR + 3.50%), Maturing August 15, 2024			489		488,750
Change Healthcare Holdings, LLC
Term Loan, 4.30%, (1 mo. USD LIBOR + 2.50%), Maturing March 1, 2024			2,374		2,385,394
CHG Healthcare Services, Inc.
Term Loan, 4.80%, (1 mo. USD LIBOR + 3.00%), Maturing June 7, 2023			1,507		1,518,466
CryoLife, Inc.
Term Loan, 5.19%, (3 mo. USD LIBOR + 3.25%), Maturing November 14, 2024			221		221,694
CTC AcquiCo GmbH
Term Loan, 2.50%, (3 mo. EURIBOR + 2.50%), Maturing March 7, 2025	EUR		390		435,235
Da Vinci Purchaser Corp.
Term Loan, Maturing December 3, 2026(5)			175		175,219

Borrower/Tranche Description	Principal Amount* (000’s omitted)		Value
Health Care (continued)
Ensemble RCM, LLC
Term Loan, 5.66%, (3 mo. USD LIBOR + 3.75%), Maturing August 3, 2026		249	$	251,401
Envision Healthcare Corporation
Term Loan, 5.55%, (1 mo. USD LIBOR + 3.75%), Maturing October 10, 2025		2,402		2,057,709
Gentiva Health Services, Inc.
Term Loan, 5.56%, (1 mo. USD LIBOR + 3.75%), Maturing July 2, 2025		1,139		1,146,753
GHX Ultimate Parent Corporation
Term Loan, 5.21%, (3 mo. USD LIBOR + 3.25%), Maturing June 28, 2024		440		440,806
Greatbatch Ltd.
Term Loan, 4.22%, (1 mo. USD LIBOR + 2.50%), Maturing October 27, 2022		683		684,734
Grifols Worldwide Operations USA, Inc.
Term Loan, 3.74%, (1 mo. USD LIBOR + 2.00%), Maturing November 15, 2027		2,009		2,027,707
Hanger, Inc.
Term Loan, 5.30%, (1 mo. USD LIBOR + 3.50%), Maturing March 6, 2025		491		493,859
Inovalon Holdings, Inc.
Term Loan, 5.25%, (1 mo. USD LIBOR + 3.50%), Maturing April 2, 2025		538		542,066
IQVIA, Inc.
Term Loan, 3.69%, (3 mo. USD LIBOR + 1.75%), Maturing March 7, 2024		313		315,154
Term Loan, 3.69%, (3 mo. USD LIBOR + 1.75%), Maturing January 17, 2025		464		466,779
Medical Solutions, LLC
Term Loan, 6.30%, (1 mo. USD LIBOR + 4.50%), Maturing June 14, 2024		567		565,961
MPH Acquisition Holdings, LLC
Term Loan, 4.69%, (3 mo. USD LIBOR + 2.75%), Maturing June 7, 2023		1,571		1,553,648
National Mentor Holdings, Inc.
Term Loan, 5.80%, (1 mo. USD LIBOR + 4.00%), Maturing March 9, 2026		13		13,289
Term Loan, 5.80%, (1 mo. USD LIBOR + 4.00%), Maturing March 9, 2026		235		237,542
Navicure, Inc.
Term Loan, 5.80%, (1 mo. USD LIBOR + 4.00%), Maturing October 22, 2026		450		451,969
One Call Corporation
Term Loan, 7.16%, (3 mo. USD LIBOR + 5.25%), Maturing November 25, 2022		1,007		936,422

14 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2019

Portfolio of Investments (Unaudited) — continued

Borrower/Tranche Description	Principal Amount* (000’s omitted)		Value
Health Care (continued)
Ortho-Clinical Diagnostics S.A.
Term Loan, 5.31%, (3 mo. USD LIBOR + 3.25%), Maturing June 30, 2025		2,313	$	2,290,314
Parexel International Corporation
Term Loan, 4.55%, (1 mo. USD LIBOR + 2.75%), Maturing September 27, 2024		1,123		1,102,475
Phoenix Guarantor, Inc.
Term Loan, 6.21%, (1 mo. USD LIBOR + 4.50%), Maturing March 5, 2026		871		876,611
Radiology Partners Holdings, LLC
Term Loan, 6.66%, (USD LIBOR + 4.75%), Maturing July 9, 2025(4)		272		273,729
RadNet, Inc.
Term Loan, 5.51%, (3 mo. USD LIBOR + 3.50%), Maturing June 30, 2023		724		729,542
Select Medical Corporation
Term Loan, 4.58%, (3 mo. USD LIBOR + 2.50%), Maturing March 6, 2025		1,265		1,269,459
Sound Inpatient Physicians
Term Loan, 4.55%, (1 mo. USD LIBOR + 2.75%), Maturing June 27, 2025		222		222,825
Surgery Center Holdings, Inc.
Term Loan, 5.05%, (1 mo. USD LIBOR + 3.25%), Maturing September 2, 2024		464		463,500
Team Health Holdings, Inc.
Term Loan, 4.55%, (1 mo. USD LIBOR + 2.75%), Maturing February 6, 2024		1,343		1,092,415
Tecomet, Inc.
Term Loan, 4.99%, (1 mo. USD LIBOR + 3.25%), Maturing May 1, 2024		366		366,825
U.S. Anesthesia Partners, Inc.
Term Loan, 4.80%, (1 mo. USD LIBOR + 3.00%), Maturing June 23, 2024		734		730,690
Verscend Holding Corp.
Term Loan, 6.30%, (1 mo. USD LIBOR + 4.50%), Maturing August 27, 2025		716		721,754
Viant Medical Holdings, Inc.
Term Loan, 5.69%, (3 mo. USD LIBOR + 3.75%), Maturing July 2, 2025		222		218,392
Wink Holdco, Inc.
Term Loan, 4.80%, (1 mo. USD LIBOR + 3.00%), Maturing December 2, 2024		221		220,638
			$	32,809,203

Borrower/Tranche Description		Principal Amount* (000’s omitted)		Value
Home Furnishings — 0.6%
Serta Simmons Bedding, LLC
Term Loan, 5.25%, (1 mo. USD LIBOR + 3.50%), Maturing November 8, 2023			2,364	$	1,537,723
				$	1,537,723
Industrial Equipment — 5.4%
AI Alpine AT Bidco GmbH
Term Loan, 4.60%, (2 mo. USD LIBOR + 2.75%), Maturing October 31, 2025			99	$	97,515
Altra Industrial Motion Corp.
Term Loan, 3.80%, (1 mo. USD LIBOR + 2.00%), Maturing October 1, 2025			311		312,243
Apex Tool Group, LLC
Term Loan, 7.30%, (1 mo. USD LIBOR + 5.50%), Maturing August 1, 2024			1,117		1,102,562
Carlisle Foodservice Products, Inc.
Term Loan, 4.80%, (1 mo. USD LIBOR + 3.00%), Maturing March 20, 2025			123		121,452
Coherent Holding GmbH
Term Loan, 3.00%, (3 mo. EURIBOR + 2.25%, Floor 0.75%), Maturing November 7, 2023	EUR		325		369,081
CPM Holdings, Inc.
Term Loan, 5.55%, (1 mo. USD LIBOR + 3.75%), Maturing November 17, 2025			149		147,634
Delachaux Group S.A.
Term Loan, 3.75%, (3 mo. EURIBOR + 3.75%), Maturing April 16, 2026	EUR		175		197,559
Term Loan, 6.50%, (3 mo. USD LIBOR + 4.50%), Maturing April 16, 2026			225		223,101
DexKo Global, Inc.
Term Loan, 3.75%, (3 mo. EURIBOR + 3.75%), Maturing July 24, 2024	EUR		147		162,210
Term Loan, 3.75%, (3 mo. EURIBOR + 3.75%), Maturing July 24, 2024	EUR		367		405,528
Term Loan, 5.30%, (1 mo. USD LIBOR + 3.50%), Maturing July 24, 2024			390		389,662
DXP Enterprises, Inc.
Term Loan, 6.54%, (1 mo. USD LIBOR + 4.75%), Maturing August 29, 2023			244		244,986
Dynacast International, LLC
Term Loan, 5.19%, (3 mo. USD LIBOR + 3.25%), Maturing January 28, 2022			577		562,659
Engineered Machinery Holdings, Inc.
Term Loan, 4.94%, (3 mo. USD LIBOR + 3.00%), Maturing July 19, 2024			641		636,165
Term Loan, 6.19%, (3 mo. USD LIBOR + 4.25%), Maturing July 19, 2024			149		148,748

15 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2019

Portfolio of Investments (Unaudited) — continued

Borrower/Tranche Description		Principal Amount* (000’s omitted)		Value
Industrial Equipment (continued)
EWT Holdings III Corp.
Term Loan, 4.80%, (1 mo. USD LIBOR + 3.00%), Maturing December 20, 2024			926	$	931,056
Filtration Group Corporation
Term Loan, 3.50%, (3 mo. EURIBOR + 3.50%), Maturing March 29, 2025	EUR		172		194,429
Term Loan, 4.80%, (1 mo. USD LIBOR + 3.00%), Maturing March 29, 2025			733		736,543
Gardner Denver, Inc.
Term Loan, 3.00%, (1 mo. EURIBOR + 3.00%), Maturing July 30, 2024	EUR		188		213,180
Term Loan, 4.55%, (1 mo. USD LIBOR + 2.75%), Maturing July 30, 2024			451		454,322
Gates Global, LLC
Term Loan, 3.00%, (3 mo. EURIBOR + 3.00%), Maturing April 1, 2024	EUR		413		464,052
Term Loan, 4.55%, (1 mo. USD LIBOR + 2.75%), Maturing April 1, 2024			2,101		2,106,639
Hayward Industries, Inc.
Term Loan, 5.30%, (1 mo. USD LIBOR + 3.50%), Maturing August 5, 2024			216		214,927
LTI Holdings, Inc.
Term Loan, 5.30%, (1 mo. USD LIBOR + 3.50%), Maturing September 6, 2025			222		201,357
Term Loan, 6.55%, (1 mo. USD LIBOR + 4.75%), Maturing July 24, 2026			100		91,521
Pro Mach Group, Inc.
Term Loan, 4.54%, (1 mo. USD LIBOR + 2.75%), Maturing March 7, 2025			123		121,930
Quimper AB
Term Loan, 4.25%, (3 mo. EURIBOR + 4.25%), Maturing February 13, 2026	EUR		850		956,822
Robertshaw US Holding Corp.
Term Loan, 5.06%, (1 mo. USD LIBOR + 3.25%), Maturing February 28, 2025			467		427,019
Shape Technologies Group, Inc.
Term Loan, 4.93%, (3 mo. USD LIBOR + 3.00%), Maturing April 21, 2025			73		66,110
Thermon Industries, Inc.
Term Loan, 5.44%, (1 mo. USD LIBOR + 3.75%), Maturing October 24, 2024			125		125,819
Titan Acquisition Limited
Term Loan, 4.80%, (1 mo. USD LIBOR + 3.00%), Maturing March 28, 2025			1,400		1,379,412
Welbilt, Inc.
Term Loan, 4.30%, (1 mo. USD LIBOR + 2.50%), Maturing October 23, 2025			639		642,199
				$	14,448,442

Borrower/Tranche Description		Principal Amount* (000’s omitted)		Value
Insurance — 6.2%
Alliant Holdings Intermediate, LLC
Term Loan, 4.80%, (1 mo. USD LIBOR + 3.00%), Maturing May 9, 2025			1,128	$	1,129,766
Term Loan, 4.99%, (1 mo. USD LIBOR + 3.25%), Maturing May 9, 2025			224		224,575
AmWINS Group, Inc.
Term Loan, 4.53%, (1 mo. USD LIBOR + 2.75%), Maturing January 25, 2024			2,061		2,079,709
Asurion, LLC
Term Loan, 4.80%, (1 mo. USD LIBOR + 3.00%), Maturing August 4, 2022			1,933		1,947,248
Term Loan, 4.80%, (1 mo. USD LIBOR + 3.00%), Maturing November 3, 2023			983		990,496
Term Loan - Second Lien, 8.30%, (1 mo. USD LIBOR + 6.50%), Maturing August 4, 2025			1,800		1,826,550
Financiere CEP S.A.S.
Term Loan, 4.25%, (3 mo. EURIBOR + 4.25%), Maturing January 16, 2025	EUR		250		283,667
FrontDoor, Inc.
Term Loan, 4.31%, (1 mo. USD LIBOR + 2.50%), Maturing August 16, 2025			222		223,018
Hub International Limited
Term Loan, 4.69%, (3 mo. USD LIBOR + 2.75%), Maturing April 25, 2025			2,315		2,316,738
Term Loan, 5.90%, (3 mo. USD LIBOR + 4.00%), Maturing April 25, 2025			850		859,297
NFP Corp.
Term Loan, 4.80%, (1 mo. USD LIBOR + 3.00%), Maturing January 8, 2024			1,619		1,614,960
Sedgwick Claims Management Services, Inc.
Term Loan, 5.05%, (1 mo. USD LIBOR + 3.25%), Maturing December 31, 2025			569		570,531
USI, Inc.
Term Loan, 4.94%, (3 mo. USD LIBOR + 3.00%), Maturing May 16, 2024			1,617		1,618,406
Term Loan, 5.94%, (3 mo. USD LIBOR + 4.00%), Maturing December 2, 2026			650		653,250
				$	16,338,211
Leisure Goods / Activities / Movies — 6.8%
AMC Entertainment Holdings, Inc.
Term Loan, 4.80%, (1 mo. USD LIBOR + 3.00%), Maturing April 22, 2026			844	$	850,796
Amer Sports Oyj
Term Loan, 4.50%, (3 mo. EURIBOR + 4.50%), Maturing March 30, 2026	EUR		1,600		1,794,336

16 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2019

Portfolio of Investments (Unaudited) — continued

Borrower/Tranche Description		Principal Amount* (000’s omitted)		Value
Leisure Goods / Activities / Movies (continued)
Ancestry.com Operations, Inc.
Term Loan, 6.05%, (1 mo. USD LIBOR + 4.25%), Maturing August 27, 2026			1,393	$	1,372,976
Bombardier Recreational Products, Inc.
Term Loan, 3.80%, (1 mo. USD LIBOR + 2.00%), Maturing May 23, 2025			2,067		2,076,201
ClubCorp Holdings, Inc.
Term Loan, 4.69%, (3 mo. USD LIBOR + 2.75%), Maturing September 18, 2024			855		812,190
Crown Finance US, Inc.
Term Loan, 2.38%, (1 mo. EURIBOR + 2.38%), Maturing February 28, 2025	EUR		126		142,480
Term Loan, 4.05%, (1 mo. USD LIBOR + 2.25%), Maturing February 28, 2025			797		796,770
Term Loan, 4.30%, (1 mo. USD LIBOR + 2.50%), Maturing September 30, 2026			698		699,996
Delta 2 (LUX) S.a.r.l.
Term Loan, 4.30%, (1 mo. USD LIBOR + 2.50%), Maturing February 1, 2024			747		751,816
Emerald Expositions Holding, Inc.
Term Loan, 4.55%, (1 mo. USD LIBOR + 2.75%), Maturing May 22, 2024			517		493,526
Etraveli Holding AB
Term Loan, 4.25%, (3 mo. EURIBOR + 4.25%), Maturing August 2, 2024	EUR		425		479,901
Lindblad Expeditions, Inc.
Term Loan, 5.05%, (1 mo. USD LIBOR + 3.25%), Maturing March 27, 2025			173		174,889
Term Loan, 5.05%, (1 mo. USD LIBOR + 3.25%), Maturing March 27, 2025			693		699,554
Match Group, Inc.
Term Loan, 4.44%, (3 mo. USD LIBOR + 2.50%), Maturing November 16, 2022			241		241,076
Motion Finco S.a.r.l.
Term Loan, 0.50%, Maturing November 4, 2026(2)			32		32,344
Term Loan, 5.15%, (2 mo. USD LIBOR + 3.25%), Maturing November 13, 2026			243		246,094
Term Loan, Maturing November 13, 2026(5)	EUR		625		707,909
NASCAR Holdings, Inc.
Term Loan, 4.49%, (1 mo. USD LIBOR + 2.75%), Maturing October 19, 2026			331		334,993
Playtika Holding Corp.
Term Loan, 7.80%, (1 mo. USD LIBOR + 6.00%), Maturing December 10, 2024			1,575		1,594,687
SeaWorld Parks & Entertainment, Inc.
Term Loan, 4.80%, (1 mo. USD LIBOR + 3.00%), Maturing March 31, 2024			806		810,544

Borrower/Tranche Description		Principal Amount* (000’s omitted)		Value
Leisure Goods / Activities / Movies (continued)
SRAM, LLC
Term Loan, 4.59%, (USD LIBOR + 2.75%), Maturing March 15, 2024(4)			573	$	577,933
Steinway Musical Instruments, Inc.
Term Loan, 5.49%, (1 mo. USD LIBOR + 3.75%), Maturing February 14, 2025			418		417,040
Travel Leaders Group, LLC
Term Loan, 5.79%, (1 mo. USD LIBOR + 4.00%), Maturing January 25, 2024			443		445,743
UFC Holdings, LLC
Term Loan, 5.05%, (1 mo. USD LIBOR + 3.25%), Maturing April 29, 2026			1,025		1,033,268
Vue International Bidco PLC
Term Loan, 4.75%, (3 mo. EURIBOR + 4.75%), Maturing July 3, 2026	EUR		297		335,702
Term Loan, Maturing July 3, 2026(5)	EUR		53		60,363
				$	17,983,127
Lodging and Casinos — 4.8%
Aimbridge Acquisition Co., Inc.
Term Loan, 5.54%, (1 mo. USD LIBOR + 3.75%), Maturing February 2, 2026			124	$	125,305
Aristocrat Technologies, Inc.
Term Loan, 3.72%, (3 mo. USD LIBOR + 1.75%), Maturing October 19, 2024			469		471,926
Azelis Finance S.A.
Term Loan, 4.00%, (6 mo. EURIBOR + 4.00%), Maturing November 7, 2025	EUR		900		1,014,788
Boyd Gaming Corporation
Term Loan, 3.85%, (1 week USD LIBOR + 2.25%), Maturing September 15, 2023			314		316,953
CityCenter Holdings, LLC
Term Loan, 4.05%, (1 mo. USD LIBOR + 2.25%), Maturing April 18, 2024			1,172		1,178,325
Eldorado Resorts, LLC
Term Loan, 4.05%, (1 mo. USD LIBOR + 2.25%), Maturing April 17, 2024			206		206,540
ESH Hospitality, Inc.
Term Loan, 3.80%, (1 mo. USD LIBOR + 2.00%), Maturing September 18, 2026			314		316,984
Golden Nugget, Inc.
Term Loan, 4.69%, (USD LIBOR + 2.75%), Maturing October 4, 2023(4)			2,268		2,278,691
GVC Holdings PLC
Term Loan, 2.50%, (6 mo. EURIBOR + 2.50%), Maturing March 29, 2024	EUR		825		932,343

17 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2019

Portfolio of Investments (Unaudited) — continued

Borrower/Tranche Description		Principal Amount* (000’s omitted)		Value
Lodging and Casinos (continued)
GVC Holdings PLC (continued)
Term Loan, 4.45%, (6 mo. USD LIBOR + 2.25%), Maturing March 29, 2024			516	$	519,251
Hanjin International Corp.
Term Loan, 4.30%, (1 mo. USD LIBOR + 2.50%), Maturing October 18, 2020			250		249,687
MGM Growth Properties Operating Partnership L.P.
Term Loan, 3.80%, (1 mo. USD LIBOR + 2.00%), Maturing March 21, 2025			652		656,331
Playa Resorts Holding B.V.
Term Loan, 4.55%, (1 mo. USD LIBOR + 2.75%), Maturing April 29, 2024			1,123		1,122,555
Stars Group Holdings B.V. (The)
Term Loan, 3.75%, (3 mo. EURIBOR + 3.75%), Maturing July 10, 2025	EUR		450		510,128
Term Loan, 5.44%, (3 mo. USD LIBOR + 3.50%), Maturing July 10, 2025			1,654		1,670,479
VICI Properties 1, LLC
Term Loan, 3.79%, (1 mo. USD LIBOR + 2.00%), Maturing December 20, 2024			1,026		1,032,051
				$	12,602,337
Nonferrous Metals / Minerals — 0.6%
CD&R Hydra Buyer, Inc.
Term Loan, 7.50%, (0.00% cash, 7.50% PIK), Maturing August 15, 2021(3)(7)			77	$	61,602
Murray Energy Corporation
DIP Loan, 13.00%, (1 mo. USD LIBOR + 11.00%, Floor 2.00%), Maturing July 31, 2020			257		262,584
Term Loan, 0.00%, Maturing October 17, 2022(6)			922		204,347
Noranda Aluminum Acquisition Corporation
Term Loan, 0.00%, Maturing February 28, 2020(6)			449		26,968
Oxbow Carbon, LLC
Term Loan, 5.55%, (1 mo. USD LIBOR + 3.75%), Maturing January 4, 2023			644		645,636
Rain Carbon GmbH
Term Loan, 3.00%, (6 mo. EURIBOR + 3.00%), Maturing January 16, 2025	EUR		450		479,527
				$	1,680,664
Oil and Gas — 4.5%
Ameriforge Group, Inc.
Term Loan, 8.94%, (3 mo. USD LIBOR + 7.00%), Maturing June 8, 2022			332	$	330,680

Borrower/Tranche Description	Principal Amount* (000’s omitted)		Value
Oil and Gas (continued)
Apergy Corporation
Term Loan, 4.42%, (1 mo. USD LIBOR + 2.50%), Maturing May 9, 2025		112	$	112,119
Blackstone CQP Holdco L.P.
Term Loan, 5.41%, (3 mo. USD LIBOR + 3.50%), Maturing September 30, 2024		473		475,948
Buckeye Partners L.P.
Term Loan, 4.44%, (1 mo. USD LIBOR + 2.75%), Maturing November 1, 2026		1,250		1,262,240
Centurion Pipeline Company, LLC
Term Loan, 5.05%, (1 mo. USD LIBOR + 3.25%), Maturing September 29, 2025		124		123,905
CITGO Holding, Inc.
Term Loan, 8.80%, (1 mo. USD LIBOR + 7.00%), Maturing August 1, 2023		125		127,337
CITGO Petroleum Corporation
Term Loan, 6.44%, (3 mo. USD LIBOR + 4.50%), Maturing July 29, 2021		450		452,453
Term Loan, 6.94%, (3 mo. USD LIBOR + 5.00%), Maturing March 28, 2024		1,439		1,448,120
Delek US Holdings, Inc.
Term Loan, 4.05%, (1 mo. USD LIBOR + 2.25%), Maturing March 31, 2025		620		620,173
Equitrans Midstream Corporation
Term Loan, 6.30%, (1 mo. USD LIBOR + 4.50%), Maturing January 31, 2024		891		888,494
Fieldwood Energy, LLC
Term Loan, 7.18%, (3 mo. USD LIBOR + 5.25%), Maturing April 11, 2022		1,338		1,125,455
Matador Bidco S.a.r.l.
Term Loan, 6.55%, (1 mo. USD LIBOR + 4.75%), Maturing June 12, 2026		1,450		1,456,798
McDermott Technology Americas, Inc.
Term Loan, 7.56%, (USD LIBOR + 10.00%), Maturing October 21, 2021(2)(4)		325		332,719
Term Loan, 6.94%, (3 mo. USD LIBOR + 5.00%), Maturing May 9, 2025		987		580,964
Prairie ECI Acquiror L.P.
Term Loan, 6.69%, (3 mo. USD LIBOR + 4.75%), Maturing March 11, 2026		1,121		1,115,294
PSC Industrial Holdings Corp.
Term Loan, 5.49%, (1 mo. USD LIBOR + 3.75%), Maturing October 11, 2024		343		341,285
Sheridan Investment Partners II L.P.
DIP Loan, 8.76%, (1 mo. USD LIBOR + 7.00%), Maturing March 19, 2020		39		38,885
DIP Loan, 8.76%, (1 mo. USD LIBOR + 7.00%), Maturing March 19, 2020		39		38,885

18 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2019

Portfolio of Investments (Unaudited) — continued

Borrower/Tranche Description	Principal Amount* (000’s omitted)		Value
Oil and Gas (continued)
Sheridan Investment Partners II L.P. (continued)
Term Loan, 0.00%, Maturing December 16, 2020(6)		15	$	4,371
Term Loan, 0.00%, Maturing December 16, 2020(6)		40		11,719
Term Loan, 0.00%, Maturing December 16, 2020(6)		286		84,245
Sheridan Production Partners I, LLC
Term Loan, 0.00%, Maturing January 17, 2020(6)		57		33,385
Term Loan, 0.00%, Maturing January 17, 2020(6)		93		54,658
Term Loan, 0.00%, Maturing January 17, 2020(6)		699		412,486
UGI Energy Services, LLC
Term Loan, 5.55%, (1 mo. USD LIBOR + 3.75%), Maturing August 13, 2026		473		475,579
			$	11,948,197
Publishing — 1.3%
Ascend Learning, LLC
Term Loan, 4.80%, (1 mo. USD LIBOR + 3.00%), Maturing July 12, 2024		538	$	541,433
Getty Images, Inc.
Term Loan, 6.31%, (1 mo. USD LIBOR + 4.50%), Maturing February 19, 2026		792		795,465
Harland Clarke Holdings Corp.
Term Loan, 6.69%, (3 mo. USD LIBOR + 4.75%), Maturing November 3, 2023		370		289,121
LSC Communications, Inc.
Term Loan, 7.12%, (1 week USD LIBOR + 5.50%), Maturing September 30, 2022		385		247,919
ProQuest, LLC
Term Loan, 5.30%, (1 mo. USD LIBOR + 3.50%), Maturing October 23, 2026		700		701,313
Terrier Media Buyer, Inc.
Term Loan, 6.15%, (3 mo. USD LIBOR + 4.25%), Maturing December 17, 2026		825		834,281
Tweddle Group, Inc.
Term Loan, 6.30%, (1 mo. USD LIBOR + 4.50%), Maturing September 17, 2023		99		91,288
			$	3,500,820
Radio and Television — 2.8%
Cumulus Media New Holdings, Inc.
Term Loan, 5.55%, (1 mo. USD LIBOR + 3.75%), Maturing March 31, 2026		249	$	252,388
Diamond Sports Group, LLC
Term Loan, 5.03%, (1 mo. USD LIBOR + 3.25%), Maturing August 24, 2026		1,421		1,421,437

Borrower/Tranche Description	Principal Amount* (000’s omitted)		Value
Radio and Television (continued)
Entercom Media Corp.
Term Loan, 4.30%, (1 mo. USD LIBOR + 2.50%), Maturing November 18, 2024		439	$	443,793
Entravision Communications Corporation
Term Loan, 4.55%, (1 mo. USD LIBOR + 2.75%), Maturing November 29, 2024		382		372,071
Gray Television, Inc.
Term Loan, 3.95%, (1 mo. USD LIBOR + 2.25%), Maturing February 7, 2024		116		116,361
Term Loan, 4.20%, (1 mo. USD LIBOR + 2.50%), Maturing January 2, 2026		276		277,894
Hubbard Radio, LLC
Term Loan, 5.30%, (1 mo. USD LIBOR + 3.50%), Maturing March 28, 2025		270		270,075
iHeartCommunications, Inc.
Term Loan, 5.69%, (1 mo. USD LIBOR + 4.00%), Maturing May 1, 2026		821		830,375
Mission Broadcasting, Inc.
Term Loan, 3.94%, (1 mo. USD LIBOR + 2.25%), Maturing January 17, 2024		157		157,711
Nexstar Broadcasting, Inc.
Term Loan, 4.05%, (1 mo. USD LIBOR + 2.25%), Maturing January 17, 2024		790		793,691
Term Loan, 4.45%, (1 mo. USD LIBOR + 2.75%), Maturing September 18, 2026		250		251,667
Sinclair Television Group, Inc.
Term Loan, 4.05%, (1 mo. USD LIBOR + 2.25%), Maturing January 3, 2024		257		257,296
Term Loan, 4.24%, (1 mo. USD LIBOR + 2.50%), Maturing September 30, 2026		299		300,700
Univision Communications, Inc.
Term Loan, 4.55%, (1 mo. USD LIBOR + 2.75%), Maturing March 15, 2024		1,698		1,679,155
			$	7,424,614
Retailers (Except Food and Drug) — 2.8%
Apro, LLC
Term Loan, 2.00%, Maturing November 14, 2026(2)		61	$	61,646
Term Loan, 5.84%, (2 mo. USD LIBOR + 4.00%), Maturing November 14, 2026		214		215,760
Ascena Retail Group, Inc.
Term Loan, 6.31%, (1 mo. USD LIBOR + 4.50%), Maturing August 21, 2022		1,047		718,070
Bass Pro Group, LLC
Term Loan, 6.80%, (1 mo. USD LIBOR + 5.00%), Maturing September 25, 2024		611		609,563

19 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2019

Portfolio of Investments (Unaudited) — continued

Borrower/Tranche Description	Principal Amount* (000’s omitted)		Value
Retailers (Except Food and Drug) (continued)
BJ’s Wholesale Club, Inc.
Term Loan, 4.49%, (1 mo. USD LIBOR + 2.75%), Maturing February 3, 2024		378	$	380,637
Coinamatic Canada, Inc.
Term Loan, 5.05%, (1 mo. USD LIBOR + 3.25%), Maturing May 14, 2022		21		20,921
David’s Bridal, Inc.
Term Loan, 4.10%, (3 mo. USD LIBOR + 2.00%), Maturing October 3, 2020		16		16,226
Term Loan, 7.92%, (3 mo. USD LIBOR + 6.00%), Maturing June 30, 2023		156		151,811
Global Appliance, Inc.
Term Loan, 5.80%, (1 mo. USD LIBOR + 4.00%), Maturing September 29, 2024		451		451,169
Hoya Midco, LLC
Term Loan, 5.30%, (1 mo. USD LIBOR + 3.50%), Maturing June 30, 2024		975		973,179
J. Crew Group, Inc.
Term Loan, 4.87%, (USD LIBOR + 3.00%), Maturing March 5, 2021(3)(4)		1,385		1,130,194
LSF9 Atlantis Holdings, LLC
Term Loan, 7.74%, (1 mo. USD LIBOR + 6.00%), Maturing May 1, 2023		445		413,862
PetSmart, Inc.
Term Loan, 5.74%, (1 mo. USD LIBOR + 4.00%), Maturing March 11, 2022		1,644		1,630,626
PFS Holding Corporation
Term Loan, 5.41%, (3 mo. USD LIBOR + 3.50%), Maturing January 31, 2021		1,023		393,959
Pier 1 Imports (U.S.), Inc.
Term Loan, 5.44%, (3 mo. USD LIBOR + 3.50%), Maturing April 30, 2021		236		63,787
Radio Systems Corporation
Term Loan, 4.55%, (1 mo. USD LIBOR + 2.75%), Maturing May 2, 2024		195		193,294
			$	7,424,704
Steel — 1.0%
Atkore International, Inc.
Term Loan, 4.70%, (3 mo. USD LIBOR + 2.75%), Maturing December 22, 2023		625	$	628,960
GrafTech Finance, Inc.
Term Loan, 5.30%, (1 mo. USD LIBOR + 3.50%), Maturing February 12, 2025		1,086		1,084,380
Neenah Foundry Company
Term Loan, 8.35%, (2 mo. USD LIBOR + 6.50%), Maturing December 13, 2022		337		330,016

Borrower/Tranche Description		Principal Amount* (000’s omitted)		Value
Steel (continued)
Phoenix Services International, LLC
Term Loan, 5.49%, (1 mo. USD LIBOR + 3.75%), Maturing March 1, 2025			393	$	372,368
Zekelman Industries, Inc.
Term Loan, 4.04%, (1 mo. USD LIBOR + 2.25%), Maturing June 14, 2021			334		334,583
				$	2,750,307
Surface Transport — 0.9%
1199169 B.C. Unlimited Liability Company
Term Loan, 5.94%, (3 mo. USD LIBOR + 4.00%), Maturing April 6, 2026			131	$	131,959
Agro Merchants NAI Holdings, LLC
Term Loan, 5.69%, (3 mo. USD LIBOR + 3.75%), Maturing December 6, 2024			172		169,881
Hertz Corporation (The)
Term Loan, 4.55%, (1 mo. USD LIBOR + 2.75%), Maturing June 30, 2023			471		474,048
Kenan Advantage Group, Inc.
Term Loan, 4.80%, (1 mo. USD LIBOR + 3.00%), Maturing July 31, 2022			53		53,176
Term Loan, 4.80%, (1 mo. USD LIBOR + 3.00%), Maturing July 31, 2022			176		174,866
PODS, LLC
Term Loan, 4.49%, (1 mo. USD LIBOR + 2.75%), Maturing December 6, 2024			269		270,536
Stena International S.a.r.l.
Term Loan, 4.94%, (3 mo. USD LIBOR + 3.00%), Maturing March 3, 2021			707		701,574
XPO Logistics, Inc.
Term Loan, 3.80%, (1 mo. USD LIBOR + 2.00%), Maturing February 24, 2025			275		276,490
				$	2,252,530
Telecommunications — 5.1%
CenturyLink, Inc.
Term Loan, 4.55%, (1 mo. USD LIBOR + 2.75%), Maturing January 31, 2025			2,426	$	2,438,302
Colorado Buyer, Inc.
Term Loan, 4.74%, (1 mo. USD LIBOR + 3.00%), Maturing May 1, 2024			391		347,338
Digicel International Finance Limited
Term Loan, 5.34%, (6 mo. USD LIBOR + 3.25%), Maturing May 28, 2024			855		768,716
eircom Holdings (Ireland) Limited
Term Loan, 3.25%, (1 mo. EURIBOR + 3.25%), Maturing May 15, 2026	EUR		791		894,577

20 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2019

Portfolio of Investments (Unaudited) — continued

Borrower/Tranche Description		Principal Amount* (000’s omitted)		Value
Telecommunications (continued)
Gamma Infrastructure III B.V.
Term Loan, 3.50%, (6 mo. EURIBOR + 3.50%), Maturing January 9, 2025	EUR		750	$	838,383
Global Eagle Entertainment, Inc.
Term Loan, 9.71%, (USD LIBOR + 7.50%), Maturing January 6, 2023(4)			1,235		1,120,452
Intelsat Jackson Holdings S.A.
Term Loan, 5.68%, (6 mo. USD LIBOR + 3.75%), Maturing November 27, 2023			1,150		1,153,737
Term Loan, 6.43%, (6 mo. USD LIBOR + 4.50%), Maturing January 2, 2024			850		859,297
IPC Corp.
Term Loan, 6.43%, (3 mo. USD LIBOR + 4.50%), Maturing August 6, 2021			557		470,554
Matterhorn Telecom S.A.
Term Loan, 3.50%, (3 mo. EURIBOR + 3.50%), Maturing September 30, 2026	EUR		225		254,690
Onvoy, LLC
Term Loan, 6.30%, (1 mo. USD LIBOR + 4.50%), Maturing February 10, 2024			827		750,162
Plantronics, Inc.
Term Loan, 4.30%, (1 mo. USD LIBOR + 2.50%), Maturing July 2, 2025			585		572,957
Sprint Communications, Inc.
Term Loan, 4.31%, (1 mo. USD LIBOR + 2.50%), Maturing February 2, 2024			1,629		1,618,237
Term Loan, 4.81%, (1 mo. USD LIBOR + 3.00%), Maturing February 2, 2024			371		370,781
Syniverse Holdings, Inc.
Term Loan, 6.85%, (2 mo. USD LIBOR + 5.00%), Maturing March 9, 2023			467		434,797
Telesat Canada
Term Loan, 4.63%, (3 mo. USD LIBOR + 2.75%), Maturing December 7, 2026			625		629,688
				$	13,522,668
Utilities — 2.4%
Brookfield WEC Holdings, Inc.
Term Loan, 5.30%, (1 mo. USD LIBOR + 3.50%), Maturing August 1, 2025			1,064	$	1,072,676
Calpine Construction Finance Company L.P.
Term Loan, 4.30%, (1 mo. USD LIBOR + 2.50%), Maturing January 15, 2025			437		439,104
Calpine Corporation
Term Loan, 4.20%, (3 mo. USD LIBOR + 2.25%), Maturing January 15, 2024			1,480		1,490,427
Term Loan, 4.20%, (3 mo. USD LIBOR + 2.25%), Maturing April 5, 2026			423		425,896

Borrower/Tranche Description	Principal Amount* (000’s omitted)		Value
Utilities (continued)
Granite Acquisition, Inc.
Term Loan, 5.44%, (3 mo. USD LIBOR + 3.50%), Maturing December 19, 2021		1,165	$	1,171,598
Lightstone Holdco, LLC
Term Loan, 5.55%, (1 mo. USD LIBOR + 3.75%), Maturing January 30, 2024		38		35,076
Term Loan, 5.55%, (1 mo. USD LIBOR + 3.75%), Maturing January 30, 2024		675		621,903
Longview Power, LLC
Term Loan, 7.93%, (3 mo. USD LIBOR + 6.00%), Maturing April 13, 2021		1,313		718,115
Talen Energy Supply, LLC
Term Loan, 5.55%, (1 mo. USD LIBOR + 3.75%), Maturing July 8, 2026		349		350,425
USIC Holdings, Inc.
Term Loan, 5.05%, (1 mo. USD LIBOR + 3.25%), Maturing December 8, 2023		98		97,917
			$	6,423,137
Total Senior Floating-Rate Loans (identified cost $357,556,880)			$	348,020,703
Corporate Bonds & Notes — 11.3%
Security	Principal Amount* (000’s omitted)		Value
Aerospace and Defense — 0.3%
TransDigm, Inc.
6.50%, 7/15/24		447	$	461,945
6.25%, 3/15/26(8)		175		189,785
7.50%, 3/15/27		241		264,052
			$	915,782
Automotive — 0.3%
Navistar International Corp.,
6.625%, 11/1/25(8)		260	$	265,417
Panther BF Aggregator 2 L.P./Panther Finance Co., Inc.
8.50%, 5/15/27(8)		417		443,834
			$	709,251
Building and Development — 0.2%
Builders FirstSource, Inc.
5.625%, 9/1/24(8)		3	$	3,126
Core & Main Holdings, L.P.
8.625%, (8.625% cash or 9.375% PIK), 9/15/24(8)(9)		29		30,244

21 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2019

Portfolio of Investments (Unaudited) — continued

Security	Principal Amount* (000’s omitted)		Value
Building and Development (continued)
Hillman Group, Inc. (The)
6.375%, 7/15/22(8)		18	$	16,791
Reliance Intermediate Holdings, L.P.
6.50%, 4/1/23(8)		50		51,396
Standard Industries, Inc.
6.00%, 10/15/25(8)		30		31,612
5.00%, 2/15/27(8)		417		435,691
			$	568,860
Business Equipment and Services — 0.7%
Allied Universal Holdco, LLC/Allied Universal Finance Corp.
6.625%, 7/15/26(8)		417	$	448,931
EIG Investors Corp.
10.875%, 2/1/24		417		417,173
Prime Security Services Borrower, LLC/Prime Finance, Inc.
5.25%, 4/15/24(8)		325		344,528
5.75%, 4/15/26(8)		325		353,845
ServiceMaster Co., LLC (The)
7.45%, 8/15/27		187		211,843
			$	1,776,320
Cable and Satellite Television — 0.6%
Altice France S.A.
8.125%, 2/1/27(8)		417	$	470,418
Altice Luxembourg S.A.
10.50%, 5/15/27(8)		207		236,373
Cablevision Systems Corp.
5.875%, 9/15/22		5		5,396
CCO Holdings, LLC/CCO Holdings Capital Corp.
5.25%, 9/30/22		13		13,169
5.75%, 1/15/24		2		2,041
5.375%, 5/1/25(8)		40		41,384
5.75%, 2/15/26(8)		20		21,137
5.50%, 5/1/26(8)		417		440,382
CSC Holdings, LLC
5.25%, 6/1/24		5		5,398
DISH DBS Corp.
6.75%, 6/1/21		5		5,266
5.875%, 7/15/22		427		453,380
TEGNA, Inc.
5.00%, 9/15/29(8)		32		32,600
			$	1,726,944

Security	Principal Amount* (000’s omitted)		Value
Chemicals and Plastics — 0.0%(10)
W.R. Grace & Co.
5.125%, 10/1/21(8)		15	$	15,666
5.625%, 10/1/24(8)		5		5,540
			$	21,206
Conglomerates — 0.0%(10)
Spectrum Brands, Inc.
5.75%, 7/15/25		30	$	31,388
5.00%, 10/1/29(8)		13		13,459
			$	44,847
Consumer Products — 0.0%(10)
Central Garden & Pet Co.
6.125%, 11/15/23		15	$	15,531
			$	15,531
Containers and Glass Products — 1.2%
ARD Finance SA,
6.50%, (6.50% cash or 7.25% PIK), 6/30/27(8)(9)		292	$	302,453
Berry Global, Inc.
6.00%, 10/15/22		4		4,086
Reynolds Group Issuer, Inc./Reynolds Group Issuer, LLC
5.75%, 10/15/20		1,914		1,918,773
5.501%, (3 mo. USD LIBOR + 3.50%), 7/15/21(8)(11)		450		451,575
7.00%, 7/15/24(8)		417		431,856
			$	3,108,743
Distribution & Wholesale — 0.0%(10)
Performance Food Group, Inc.
5.50%, 10/15/27(8)		30	$	32,138
			$	32,138
Diversified Financial Services — 0.1%
GEMS MENASA Cayman, Ltd./GEMS Education Delaware, LLC
7.125%, 7/31/26(8)		200	$	210,867
			$	210,867
Drugs — 0.9%
Bausch Health Americas, Inc.
8.50%, 1/31/27(8)		90	$	102,659
Bausch Health Companies, Inc.
6.50%, 3/15/22(8)		404		413,595

22 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2019

Portfolio of Investments (Unaudited) — continued

Security		Principal Amount* (000’s omitted)		Value
Drugs (continued)
Bausch Health Companies, Inc. (continued)
7.00%, 3/15/24(8)			525	$	547,095
5.50%, 11/1/25(8)			850		890,022
7.00%, 1/15/28(8)			327		360,305
Jaguar Holding Co. II/Pharmaceutical Product Development, LLC
6.375%, 8/1/23(8)			30		31,040
				$	2,344,716
Ecological Services and Equipment — 0.2%
Covanta Holding Corp.
5.875%, 3/1/24			10	$	10,317
GFL Environmental, Inc.
8.50%, 5/1/27(8)			417		459,471
				$	469,788
Electronics / Electrical — 0.2%
CommScope, Inc.
6.00%, 3/1/26(8)			450	$	479,531
Infor (US), Inc.
6.50%, 5/15/22			25		25,419
Sensata Technologies, Inc.
4.375%, 2/15/30(8)			21		21,461
				$	526,411
Entertainment — 0.2%
Merlin Entertainments PLC
5.75%, 6/15/26(8)			417	$	457,802
				$	457,802
Financial Intermediaries — 0.2%
Icahn Enterprises, L.P./Icahn Enterprises Finance Corp.
6.25%, 2/1/22			10	$	10,208
6.25%, 5/15/26			417		444,886
JPMorgan Chase & Co.
Series S, 6.75% to 2/1/24(12)(13)			35		39,549
Navient Corp.
5.00%, 10/26/20			10		10,159
				$	504,802
Food Products — 0.2%
Iceland Bondco PLC
5.035%, (3 mo. GBP LIBOR + 4.25%), 7/15/20(8)(11)	GBP		93	$	123,829

Security	Principal Amount* (000’s omitted)		Value
Food Products (continued)
JBS USA LUX SA/JBS USA Food Co./JBS USA Finance, Inc.
5.50%, 1/15/30(8)		103	$	110,823
Post Holdings, Inc.
8.00%, 7/15/25(8)		5		5,370
5.625%, 1/15/28(8)		417		450,089
			$	690,111
Food Service — 0.0%(10)
Yum! Brands, Inc.
4.75%, 1/15/30(8)		62	$	65,060
			$	65,060
Food / Drug Retailers — 0.1%
Fresh Market, Inc. (The)
9.75%, 5/1/23(8)		575	$	293,250
			$	293,250
Health Care — 1.1%
Avantor, Inc.
6.00%, 10/1/24(8)		675	$	721,113
Centene Corp.
4.75%, 5/15/22		10		10,218
Eagle Holding Co. II, LLC
7.75%, (7.75% cash or 8.50% PIK), 5/15/22(8)(9)		417		424,156
HCA Healthcare, Inc.
6.25%, 2/15/21		40		41,790
HCA, Inc.
5.875%, 2/15/26		10		11,390
5.375%, 9/1/26		417		465,487
Hologic, Inc.
4.375%, 10/15/25(8)		10		10,346
MPH Acquisition Holdings, LLC
7.125%, 6/1/24(8)		250		242,497
RegionalCare Hospital Partners Holdings, Inc.
8.25%, 5/1/23(8)		850		899,406
Tenet Healthcare Corp.
8.125%, 4/1/22		20		22,160
6.75%, 6/15/23		5		5,504
			$	2,854,067
Insurance — 0.2%
AssuredPartners, Inc.
7.00%, 8/15/25(8)		417	$	425,211
			$	425,211

23 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2019

Portfolio of Investments (Unaudited) — continued

Security	Principal Amount* (000’s omitted)		Value
Internet Software & Services — 0.1%
Netflix, Inc.
5.50%, 2/15/22		20	$	21,225
5.875%, 2/15/25		20		22,342
5.375%, 11/15/29(8)		105		112,017
Riverbed Technology, Inc.
8.875%, 3/1/23(8)		11		6,380
			$	161,964
Leisure Goods / Activities / Movies — 0.2%
Mattel, Inc.
6.75%, 12/31/25(8)		40	$	43,076
Sabre GLBL, Inc.
5.375%, 4/15/23(8)		10		10,266
5.25%, 11/15/23(8)		20		20,575
Viking Cruises, Ltd.
6.25%, 5/15/25(8)		20		20,883
5.875%, 9/15/27(8)		417		446,440
			$	541,240
Lodging and Casinos — 0.6%
Caesars Resort Collection, LLC/CRC Finco, Inc.
5.25%, 10/15/25(8)		417	$	432,116
ESH Hospitality, Inc.
5.25%, 5/1/25(8)		15		15,537
4.625%, 10/1/27(8)		40		40,574
Golden Nugget, Inc.
8.75%, 10/1/25(8)		221		236,882
MGM Growth Properties Operating Partnership, L.P./MGP Finance Co-Issuer, Inc.
5.625%, 5/1/24		5		5,460
MGM Resorts International
7.75%, 3/15/22		15		16,752
RHP Hotel Properties, L.P./RHP Finance Corp.
5.00%, 4/15/23		15		15,344
Stars Group Holdings B.V./Stars Group US Co-Borrower, LLC
7.00%, 7/15/26(8)		417		452,695
Wynn Las Vegas, LLC/Wynn Las Vegas Capital Corp.
5.25%, 5/15/27(8)		417		443,584
Wynn Resorts Finance, LLC/Wynn Resorts Capital Corp.
5.125%, 10/1/29(8)		38		40,874
			$	1,699,818

Security	Principal Amount* (000’s omitted)		Value
Nonferrous Metals / Minerals — 0.0%(10)
New Gold, Inc.
6.25%, 11/15/22(8)		5	$	4,989
			$	4,989
Oil and Gas — 1.3%
Antero Resources Corp.
5.375%, 11/1/21		40	$	38,160
5.625%, 6/1/23		5		4,025
Ascent Resources Utica Holdings, LLC/ARU Finance Corp.
10.00%, 4/1/22(8)		417		415,801
Centennial Resource Production, LLC
6.875%, 4/1/27(8)		417		434,649
CITGO Holding, Inc.
9.25%, 8/1/24(8)		250		268,750
CITGO Petroleum Corp.
6.25%, 8/15/22(8)		325		330,279
CVR Refining, LLC/Coffeyville Finance, Inc.
6.50%, 11/1/22		60		60,900
Energy Transfer Operating, L.P.
5.875%, 1/15/24		15		16,606
Hilcorp Energy I, L.P./Hilcorp Finance Co.
6.25%, 11/1/28(8)		417		397,337
Neptune Energy Bondco PLC
6.625%, 5/15/25(8)		463		463,866
Newfield Exploration Co.
5.625%, 7/1/24		65		71,468
Parsley Energy, LLC/Parsley Finance Corp.
5.25%, 8/15/25(8)		5		5,152
5.625%, 10/15/27(8)		125		132,419
PBF Logistics, L.P./PBF Logistics Finance Corp.
6.875%, 5/15/23		3		3,097
Precision Drilling Corp.
6.50%, 12/15/21		445		445,402
Seven Generations Energy, Ltd.
6.75%, 5/1/23(8)		25		25,698
6.875%, 6/30/23(8)		15		15,475
Tervita Escrow Corp.
7.625%, 12/1/21(8)		425		428,613
Williams Cos., Inc. (The)
4.55%, 6/24/24		5		5,397
			$	3,563,094

24 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2019

Portfolio of Investments (Unaudited) — continued

Security	Principal Amount* (000’s omitted)		Value
Radio and Television — 0.5%
Diamond Sports Group, LLC/Diamond Sports Finance Co.
6.625%, 8/15/27(8)		250	$	243,587
iHeartCommunications, Inc.
6.375%, 5/1/26		102		111,194
8.375%, 5/1/27		185		205,240
Nielsen Co. Luxembourg S.a.r.l. (The)
5.50%, 10/1/21(8)		15		15,090
Sirius XM Radio, Inc.
5.00%, 8/1/27(8)		417		440,706
Terrier Media Buyer, Inc.
8.875%, 12/15/27(8)		250		265,000
Univision Communications, Inc.
6.75%, 9/15/22(8)		124		126,209
			$	1,407,026
Road & Rail — 0.0%(10)
Watco Cos., LLC/Watco Finance Corp.
6.375%, 4/1/23(8)		20	$	20,358
			$	20,358
Software and Services — 0.0%(10)
IHS Markit, Ltd.
5.00%, 11/1/22(8)		25	$	26,668
			$	26,668
Steel — 0.2%
Allegheny Technologies, Inc.
7.875%, 8/15/23		463	$	519,910
			$	519,910
Surface Transport — 0.2%
DAE Funding, LLC
5.00%, 8/1/24(8)		417	$	438,864
XPO Logistics, Inc.
6.50%, 6/15/22(8)		22		22,457
			$	461,321
Telecommunications — 1.0%
CenturyLink, Inc.
6.75%, 12/1/23		15	$	16,775
CommScope Technologies, LLC
6.00%, 6/15/25(8)		12		12,044
5.00%, 3/15/27(8)		349		328,941

Security	Principal Amount* (000’s omitted)		Value
Telecommunications (continued)
Connect Finco S.a.r.l./Connect US Finco, LLC
6.75%, 10/1/26(8)		200	$	213,250
Digicel International Finance, Ltd./Digicel Holdings Bermuda, Ltd.
8.75%, 5/25/24(8)		275		268,927
Hughes Satellite Systems Corp.
6.625%, 8/1/26		417		464,057
Intelsat Jackson Holdings S.A.
5.50%, 8/1/23		10		8,611
8.50%, 10/15/24(8)		213		194,451
Level 3 Financing, Inc.
5.375%, 1/15/24		10		10,192
Sprint Communications, Inc.
7.00%, 8/15/20		76		77,702
6.00%, 11/15/22		5		5,253
Sprint Corp.
7.25%, 9/15/21		110		116,525
7.875%, 9/15/23		644		711,887
7.625%, 2/15/25		154		169,377
T-Mobile USA, Inc.
6.375%, 3/1/25		15		15,531
6.50%, 1/15/26		45		48,333
			$	2,661,856
Utilities — 0.5%
Calpine Corp.
5.25%, 6/1/26(8)		917	$	956,956
Vistra Energy Corp.
8.125%, 1/30/26(8)		10		10,725
Vistra Operations Co., LLC
5.00%, 7/31/27(8)		250		261,707
			$	1,229,388
Total Corporate Bonds & Notes (identified cost $29,523,446)			$	30,059,339
Asset-Backed Securities — 6.6%
Security	Principal Amount (000’s omitted)		Value
Allegany Park CLO, Ltd.
Series 2019-1A, Class E, (3 mo. USD LIBOR + 6.77%), 1/20/33(8)(14)	$	450	$	449,438

25 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2019

Portfolio of Investments (Unaudited) — continued

Security	Principal Amount (000’s omitted)		Value
Ares LII CLO, Ltd.
Series 2019-52A, Class E, 8.503%, (3 mo. USD LIBOR + 6.55%), 4/22/31(8)(11)	$	500	$	492,799
Ares XXXIIR CLO, Ltd.
Series 2014-32RA, Class D, 7.76%, (3 mo. USD LIBOR + 5.85%), 5/15/30(8)(11)		1,000		957,592
Bardot CLO, Ltd.
Series 2019-2A, Class E, 8.816%, (3 mo. USD LIBOR + 6.95%), 10/22/32(8)(11)		500		503,564
Benefit Street Partners CLO XIX, Ltd.
Series 2019-19A, Class E, (3 mo. USD LIBOR + 7.02%), 1/15/33(8)(14)		750		738,959
Benefit Street Partners CLO XVII, Ltd.
Series 2019-17A, Class E, 8.601%, (3 mo. USD LIBOR + 6.60%), 7/15/32(8)(11)		500		482,228
Benefit Street Partners CLO XVIII, Ltd.
Series 2019-18A, Class E, 8.809%, (3 mo. USD LIBOR + 6.90%), 10/15/32(8)(11)		500		500,217
BlueMountain CLO XXV, Ltd.
Series 2019-25A, Class E, 8.531%, (3 mo. USD LIBOR + 6.70%), 7/15/32(8)(11)		500		496,345
BlueMountain CLO XXVI, Ltd.
Series 2019-26A, Class E, 9.526%, (3 mo. USD LIBOR + 7.70%), 10/20/32(8)(11)		1,000		1,008,487
Canyon Capital CLO, Ltd.
Series 2019-2A, Class E, 9.238%, (3 mo. USD LIBOR + 7.15%), 10/15/32(8)(11)		400		400,071
Carlyle Global Market Strategies CLO, Ltd.
Series 2012-3A, Class DR2, 8.486%, (3 mo. USD LIBOR + 6.50%), 1/14/32(8)(11)		600		541,567
Series 2015-5A, Class DR, 8.666%, (3 mo. USD LIBOR + 6.70%), 1/20/32(8)(11)		500		466,647
Cedar Funding X CLO, Ltd.
Series 2019-10A, Class E, 9.131%, (3 mo. USD LIBOR + 7.00%), 10/20/32(8)(11)		500		496,643
Dryden 40 Senior Loan Fund
Series 2015-40A, Class ER, 7.66%, (3 mo. USD LIBOR + 5.75%), 8/15/31(8)(11)		500		474,927
Fort Washington CLO, Ltd.
Series 2019-1A, Class E, 9.158%, (3 mo. USD LIBOR + 7.25%), 10/20/32(8)(11)		500		497,726
Galaxy XV CLO, Ltd.
Series 2013-15A, Class ER, 8.646%, (3 mo. USD LIBOR + 6.65%), 10/15/30(8)(11)		500		472,496
Galaxy XXI CLO, Ltd.
Series 2015-21A, Class ER, 7.216%, (3 mo. USD LIBOR + 5.25%), 4/20/31(8)(11)		500		465,568
Golub Capital Partners CLO, Ltd.
Series 2015-23A, Class ER, 7.716%, (3 mo. USD LIBOR + 5.75%), 1/20/31(8)(11)		600		533,137

Security	Principal Amount (000’s omitted)		Value
Kayne CLO, Ltd.
Series 2019-5A, Class E, 8.881%, (3 mo. USD LIBOR + 6.70%), 7/24/32(8)(11)	$	500	$	480,653
Madison Park Funding XXXVI, Ltd.
Series 2019-36A, Class E, 9.20%, (3 mo. USD LIBOR + 7.25%), 1/15/33(8)(11)		250		251,863
Madison Park Funding XXXVII, Ltd.
Series 2019-37A, Class E, 8.381%, (3 mo. USD LIBOR + 6.55%), 7/15/32(8)(11)		500		501,977
Neuberger Berman Loan Advisers CLO 31, Ltd.
Series 2019-31A, Class E, 8.716%, (3 mo. USD LIBOR + 6.75%), 4/20/31(8)(11)		500		498,054
Neuberger Berman Loan Advisers CLO 33, Ltd.
Series 2019-33A, Class E, 8.94%, (3 mo. USD LIBOR + 6.80%), 10/16/32(8)(11)		500		492,557
Palmer Square CLO, Ltd.
Series 2013-2A, Class DRR, 7.852%, (3 mo. USD LIBOR + 5.85%), 10/17/31(8)(11)		450		435,049
Series 2015-2A, Class DR, 8.466%, (3 mo. USD LIBOR + 6.50%), 7/20/30(8)(11)		600		600,008
Series 2019-1A, Class D, 8.935%, (3 mo. USD LIBOR + 7.00%), 11/14/32(8)(11)		500		502,739
Regatta XII Funding, Ltd.
Series 2019-1A, Class E, 8.851%, (3 mo. USD LIBOR + 6.85%), 10/15/32(8)(11)		300		294,832
Regatta XIV Funding, Ltd.
Series 2018-3A, Class E, 7.89%, (3 mo. USD LIBOR + 5.95%), 10/25/31(8)(11)		300		283,146
Regatta XVI Funding, Ltd.
Series 2019-2A, Class E, 8.903%, (3 mo. USD LIBOR + 7.00%), 1/15/33(8)(11)		500		496,864
Southwick Park CLO, LLC
Series 2019-4A, Class E, 8.866%, (3 mo. USD LIBOR + 6.70%), 7/20/32(8)(11)		1,000		974,118
Vibrant CLO X, Ltd.
Series 2018-10A, Class D, 8.156%, (3 mo. USD LIBOR + 6.19%), 10/20/31(8)(11)		375		335,458
Vibrant CLO XI, Ltd.
Series 2019-11A, Class D, 8.869%, (3 mo. USD LIBOR + 6.77%), 7/20/32(8)(11)		500		474,121
Voya CLO, Ltd.
Series 2013-1A, Class DR, 8.481%, (3 mo. USD LIBOR + 6.48%), 10/15/30(8)(11)		1,000		950,041
Total Asset-Backed Securities (identified cost $17,814,998)			$	17,549,891

26 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2019

Portfolio of Investments (Unaudited) — continued

Common Stocks — 1.6%
Security	Shares		Value
Aerospace and Defense — 0.1%
IAP Global Services, LLC(3)(15)(16)		29	$	371,526
			$	371,526
Automotive — 0.1%
Dayco Products, LLC(15)(16)		10,159	$	213,339
			$	213,339
Business Equipment and Services — 0.0%(10)
Crossmark Holdings, Inc.(15)(16)		1,731	$	87,415
			$	87,415
Chemicals and Plastics — 0.1%
Hexion Holdings Corp., Class B(15)(16)		18,444	$	222,250
			$	222,250
Electronics / Electrical — 0.0%(10)
Answers Corp.(3)(15)		46,839	$	91,336
			$	91,336
Health Care — 0.0%
New Millennium Holdco, Inc.(3)(15)(16)		35,156	$	0
			$	0
Oil and Gas — 0.5%
AFG Holdings, Inc.(3)(15)(16)		13,348	$	604,932
Fieldwood Energy, Inc.(15)(16)		9,594		201,474
Nine Point Energy Holdings, Inc.(3)(16)(17)		325		3
Samson Resources II, LLC, Class A(15)		22,051		463,071
Southcross Holdings Group, LLC(3)(15)(16)		30		0
Southcross Holdings L.P., Class A(15)(16)		30		2,190
			$	1,271,670
Publishing — 0.4%
ION Media Networks, Inc.(3)(15)		2,155	$	999,812
Tweddle Group, Inc.(3)(15)(16)		889		125
			$	999,937
Radio and Television — 0.3%
Clear Channel Outdoor Holdings, Inc.(15)(16)		42,539	$	121,662
Cumulus Media, Inc., Class A(15)(16)		18,865		331,458
iHeartMedia, Inc., Class A(15)(16)		18,090		305,721
			$	758,841

Security	Shares		Value
Retailers (Except Food and Drug) — 0.1%
David’s Bridal, LLC(3)(15)(16)		11,238	$	243,415
			$	243,415
Total Common Stocks (identified cost $3,565,753)			$	4,259,729
Convertible Preferred Stocks — 0.0%(10)
Security	Shares		Value
Oil and Gas — 0.0%(10)
Nine Point Energy Holdings, Inc., Series A, 12.00%(3)(16)(17)		5	$	2,889
Total Convertible Preferred Stocks (identified cost $5,000)			$	2,889
Preferred Stocks — 0.0%(10)
Security	Shares		Value
Retailers (Except Food and Drug) — 0.0%(10)
David’s Bridal, LLC, Series A(3)(15)(16)		313	$	25,040
David’s Bridal, LLC, Series B(3)(15)(16)		1,274		103,143
Total Preferred Stocks (identified cost $103,143)			$	128,183
Closed-End Funds — 1.9%
Security	Shares		Value
BlackRock Floating Rate Income Strategies Fund, Inc.		49,400	$	663,936
Invesco Senior Income Trust		178,510		765,808
Nuveen Credit Strategies Income Fund		180,539		1,384,734
Nuveen Floating Rate Income Fund		73,198		749,548
Nuveen Floating Rate Income Opportunity Fund		51,054		510,029
Voya Prime Rate Trust		196,084		982,381
Total Closed-End Funds (identified cost $5,726,072)			$	5,056,436

27 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2019

Portfolio of Investments (Unaudited) — continued

Warrants — 0.0%
Security	Shares		Value
Retailers (Except Food and Drug) — 0.0%
David’s Bridal, LLC, Exp. 11/26/22(3)(15)(16)		2,169	$	0
Total Warrants (identified cost $0)			$	0
Miscellaneous — 0.0%(10)
Security	Shares		Value
Cable and Satellite Television — 0.0%
ACC Claims Holdings, LLC(3)(16)		200,340	$	0
			$	0
Oil and Gas — 0.0%(10)
Paragon Offshore Finance Company, Class A(15)(16)		764	$	229
Paragon Offshore Finance Company, Class B(15)(16)		382		7,640
			$	7,869
Total Miscellaneous (identified cost $8,309)			$	7,869
Short-Term Investments — 2.1%
Description	Units		Value
Eaton Vance Cash Reserves Fund, LLC, 1.78%(18)		5,500,458	$	5,500,458
Total Short-Term Investments (identified cost $5,500,456)			$	5,500,458
Total Investments — 154.7% (identified cost $419,804,057)			$	410,585,497
Less Unfunded Loan Commitments — (0.1)%			$	(362,839	)
Net Investments — 154.6% (identified cost $419,441,218)			$	410,222,658
Other Assets, Less Liabilities — (40.4)%			$	(107,269,709	)
Auction Preferred Shares Plus Cumulative Unpaid Dividends — (14.2)%			$	(37,608,279	)
Net Assets Applicable to Common Shares — 100.0%			$	265,344,670

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

* In U.S. dollars unless otherwise indicated.

⁽¹⁾ Senior floating-rate loans (Senior Loans) often require prepayments from excess cash flows or permit the borrowers to repay at their election. The degree to which borrowers repay, whether as a contractual requirement or at their election, cannot be predicted with accuracy. As a result, the actual remaining maturity may be substantially less than the stated maturities shown. However, Senior Loans will typically have an expected average life of approximately two to four years. Senior Loans typically have rates of interest which are redetermined periodically by reference to a base lending rate, plus a spread. These base lending rates are primarily the London Interbank Offered Rate (“LIBOR”) and secondarily, the prime rate offered by one or more major United States banks (the “Prime Rate”). Base lending rates may be subject to a floor, or minimum rate.

⁽²⁾ Unfunded or partially unfunded loan commitments. The stated interest rate reflects the weighted average of the reference rate and spread for the funded portion, if any, and the commitment fees on the portion of the loan that is unfunded. At December 31, 2019, the total value of unfunded loan commitments is $363,470. See Note 1F for description.

⁽³⁾ For fair value measurement disclosure purposes, security is categorized as Level 3 (see Note 13).

⁽⁴⁾ The stated interest rate represents the weighted average interest rate at December 31, 2019 of contracts within the senior loan facility. Interest rates on contracts are primarily redetermined either weekly, monthly or quarterly by reference to the indicated base lending rate and spread and the reset period.

⁽⁵⁾ This Senior Loan will settle after December 31, 2019, at which time the interest rate will be determined.

⁽⁶⁾ Issuer is in default with respect to interest and/or principal payments. For a variable rate security, interest rate has been adjusted to reflect non-accrual status.

⁽⁷⁾ Fixed-rate loan.

⁽⁸⁾ Security exempt from registration pursuant to Rule 144A under the Securities Act of 1933, as amended. These securities may be sold in certain transactions in reliance on an exemption from registration (normally to qualified institutional buyers). At December 31, 2019, the aggregate value of these securities is $39,495,937 or 14.9% of the Trust’s net assets applicable to common shares.

⁽⁹⁾ Represents a payment-in-kind security which may pay interest in additional principal at the issuer’s discretion.

⁽¹⁰⁾ Amount is less than 0.05%.

⁽¹¹⁾ Variable rate security. The stated interest rate represents the rate in effect at December 31, 2019.

⁽¹²⁾ Security converts to variable rate after the indicated fixed-rate coupon period.

⁽¹³⁾ Perpetual security with no stated maturity date but may be subject to calls by the issuer.

⁽¹⁴⁾ When-issued, variable rate security whose interest rate will be determined after December 31, 2019.

⁽¹⁵⁾ Security was acquired in connection with a restructuring of a Senior Loan and may be subject to restrictions on resale.

⁽¹⁶⁾ Non-income producing security.

⁽¹⁷⁾ Restricted security (see Note 7).

⁽¹⁸⁾ 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 annualized seven-day yield as of December 31, 2019.

28 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2019

Portfolio of Investments (Unaudited) — continued

Forward Foreign Currency Exchange Contracts
Currency Purchased		Currency Sold		Counterparty	Settlement Date		Unrealized Appreciation		Unrealized (Depreciation)
USD	7,249,609	EUR	6,483,082	Goldman Sachs International		1/31/20	$	—	$	(35,112	)
USD	733,474	GBP	568,368	State Street Bank and Trust Company		1/31/20		—		(19,992	)
USD	7,425,430	EUR	6,694,280	State Street Bank and Trust Company		2/28/20		—		(109,774	)
USD	8,754,289	EUR	7,844,521	HSBC Bank USA, N.A.		3/31/20		—		(93,512	)
							$	—	$	(258,390	)

Abbreviations:

DIP	–	Debtor In Possession
EURIBOR	–	Euro Interbank Offered Rate
LIBOR	–	London Interbank Offered Rate
PIK	–	Payment In Kind

Currency Abbreviations:

EUR	–	Euro
GBP	–	British Pound Sterling
USD	–	United States Dollar

29 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2019

Statement of Assets and Liabilities (Unaudited)

Assets	December 31, 2019
Unaffiliated investments, at value (identified cost, $413,940,762)	$	404,722,200
Affiliated investment, at value (identified cost, $5,500,456)		5,500,458
Cash		4,239,138
Deposits for derivatives collateral — forward foreign currency exchange contracts		150,000
Foreign currency, at value (identified cost, $238,927)		239,649
Interest and dividends receivable		1,739,673
Dividends receivable from affiliated investment		6,411
Receivable for investments sold		514,617
Prepaid upfront fees on notes payable		23,520
Prepaid expenses		38,018
Total assets	$	417,173,684
Liabilities
Notes payable	$	108,000,000
Payable for investments purchased		2,532,979
Payable for when-issued securities		1,182,081
Payable for open forward foreign currency exchange contracts		258,390
Distributions payable		1,438,931
Payable to affiliates:
Investment adviser fee		258,595
Administration fee		86,198
Trustees’ fees		5,133
Accrued expenses		458,428
Total liabilities	$	114,220,735
Auction preferred shares (1,504 shares outstanding) at liquidation value plus cumulative unpaid dividends	$	37,608,279
Net assets applicable to common shares	$	265,344,670
Sources of Net Assets
Common shares, $0.01 par value, unlimited number of shares authorized, 37,866,607 shares issued and outstanding	$	378,666
Additional paid-in capital		277,568,442
Accumulated loss		(12,602,438	)
Net assets applicable to common shares	$	265,344,670
Net Asset Value Per Common Share
($265,344,670 ÷ 37,866,607 common shares issued and outstanding)	$	7.01

30 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2019

Statement of Operations (Unaudited)

Investment Income	Six Months Ended December 31, 2019
Interest and other income	$	11,462,320
Dividends		1,033,088
Dividends from affiliated investment		73,372
Total investment income	$	12,568,780
Expenses
Investment adviser fee	$	1,550,492
Administration fee		516,831
Trustees’ fees and expenses		9,641
Custodian fee		72,482
Transfer and dividend disbursing agent fees		9,214
Legal and accounting services		28,066
Printing and postage		17,540
Interest expense and fees		1,750,723
Preferred shares service fee		16,304
Miscellaneous		24,987
Total expenses	$	3,996,280
Net investment income	$	8,572,500
Realized and Unrealized Gain (Loss)
Net realized gain (loss) —
Investment transactions	$	(2,560,511	)
Investment transactions — affiliated investment		(879	)
Foreign currency transactions		72,989
Forward foreign currency exchange contracts		730,851
Net realized loss	$	(1,757,550	)
Change in unrealized appreciation (depreciation) —
Investments	$	1,805,931
Investments — affiliated investment		2
Foreign currency		(1,079	)
Forward foreign currency exchange contracts		(80,435	)
Net change in unrealized appreciation (depreciation)	$	1,724,419
Net realized and unrealized gain	$	33,131
Distributions to preferred shareholders	$	(464,543	)
Net increase in net assets from operations	$	8,074,826

31 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2019

Statements of Changes in Net Assets

Increase (Decrease) in Net Assets	Six Months Ended December 31, 2019 (Unaudited)			Year Ended June 30, 2019
From operations —
Net investment income	$	8,572,500		$	15,520,463
Net realized gain (loss)		(1,757,550	)		2,658,192
Net change in unrealized appreciation (depreciation)		1,724,419			(9,320,374	)
Distributions to preferred shareholders		(464,543	)		(1,175,940	)
Discount on redemption and repurchase of auction preferred shares		—			1,920,000
Net increase in net assets from operations	$	8,074,826		$	9,602,341
Distributions to common shareholders	$	(9,655,985	)	$	(14,692,244	)
Net decrease in net assets	$	(1,581,159	)	$	(5,089,903	)
Net Assets Applicable to Common Shares
At beginning of period	$	266,925,829		$	272,015,732
At end of period	$	265,344,670		$	266,925,829

32 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2019

Statement of Cash Flows (Unaudited)

Cash Flows From Operating Activities	Six Months Ended December 31, 2019
Net increase in net assets from operations	$	8,074,826
Distributions to preferred shareholders		464,543
Net increase in net assets from operations excluding distributions to preferred shareholders	$	8,539,369
Adjustments to reconcile net increase in net assets from operations to net cash provided by operating activities:
Investments purchased		(67,055,484	)
Investments sold and principal repayments		63,499,045
Increase in short-term investments, net		(2,306,899	)
Net amortization/accretion of premium (discount)		(68,627	)
Amortization of prepaid upfront fees on notes payable		63,296
Increase in interest and dividends receivable		(124,709	)
Decrease in dividends receivable from affiliated investment		2,275
Decrease in receivable for open forward foreign currency exchange contracts		15,415
Increase in prepaid expenses		(4,605	)
Increase in payable for open forward foreign currency exchange contracts		65,020
Increase in payable to affiliate for investment adviser fee		3,462
Increase in payable to affiliate for administration fee		1,154
Decrease in payable to affiliate for Trustees’ fees		(622	)
Decrease in accrued expenses		(73,575	)
Increase in unfunded loan commitments		218,055
Net change in unrealized (appreciation) depreciation from investments		(1,805,933	)
Net realized loss from investments		2,561,390
Net cash provided by operating activities	$	3,528,027
Cash Flows From Financing Activities
Cash distributions paid to common shareholders	$	(8,217,054	)
Cash distributions paid to preferred shareholders		(465,473	)
Proceeds from notes payable		12,000,000
Repayments of notes payable		(7,000,000	)
Net cash used in financing activities	$	(3,682,527	)
Net decrease in cash and restricted cash*	$	(154,500	)
Cash and restricted cash at beginning of period (including foreign currency)	$	4,783,287
Cash and restricted cash at end of period (including foreign currency)	$	4,628,787
Supplemental disclosure of cash flow information:
Cash paid for interest and fees on borrowings	$	1,748,621

* Includes net change in unrealized appreciation (depreciation) on foreign currency of $711.

33 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2019

Statement of Cash Flows (Unaudited) — continued

The following table provides a reconciliation of cash and restricted cash reported within the Statement of Assets and Liabilities that sum to the total of such amounts shown on the Statement of Cash Flows.

	December 31, 2019
Cash	$	4,239,138
Deposits for derivatives collateral — forward foreign currency exchange contracts		150,000
Foreign currency		239,649
Total cash and restricted cash as shown in the Statement of Cash Flows	$	4,628,787

34 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2019

Financial Highlights

Selected data for a common share outstanding during the periods stated

	Six Months Ended December 31, 2019 (Unaudited)			Year Ended June 30,
				2019			2018			2017			2016			2015
Net asset value — Beginning of period (Common shares)	$	7.050		$	7.180		$	7.150		$	6.650		$	7.020		$	7.340
Income (Loss) From Operations
Net investment income(1)	$	0.226		$	0.410		$	0.385		$	0.404		$	0.422		$	0.401
Net realized and unrealized gain (loss)		0.001			(0.172	)		0.038			0.436			(0.371	)		(0.316	)
Distributions to preferred shareholders —
From net investment income(1)		(0.012	)		(0.031	)		(0.028	)		(0.014	)		(0.009	)		(0.003	)
Discount on redemption and repurchase of auction preferred shares(1)		—			0.051			—			0.064			—			—
Total income from operations	$	0.215		$	0.258		$	0.395		$	0.890		$	0.042		$	0.082
Less Distributions to Common Shareholders
From net investment income	$	(0.255	)	$	(0.388	)	$	(0.365	)	$	(0.390	)	$	(0.412	)	$	(0.402	)
Total distributions to common shareholders	$	(0.255	)	$	(0.388	)	$	(0.365	)	$	(0.390	)	$	(0.412	)	$	(0.402	)
Net asset value — End of period (Common shares)	$	7.010		$	7.050		$	7.180		$	7.150		$	6.650		$	7.020
Market value — End of period (Common shares)	$	6.410		$	6.230		$	6.380		$	6.650		$	6.010		$	6.210
Total Investment Return on Net Asset Value(2)		3.52	%(3)		4.46	%(4)		6.12	%		14.02	%(5)		1.57	%		1.71	%
Total Investment Return on Market Value(2)		7.12	%(3)		3.88	%		1.39	%		17.34	%		3.77	%		(3.02	)%

35 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2019

Financial Highlights — continued

Selected data for a common share outstanding during the periods stated

	Six Months Ended December 31, 2019 (Unaudited)			Year Ended June 30,
Ratios/Supplemental Data				2019			2018			2017			2016			2015
Net assets applicable to common shares, end of period (000’s omitted)	$	265,345		$	266,926		$	272,016		$	270,810		$	251,789		$	266,009
Ratios (as a percentage of average daily net assets applicable to common shares):(6)†
Expenses excluding interest and fees(7)		1.69	%(8)		1.73	%		1.82	%		1.87	%		1.96	%		1.99	%
Interest and fee expense(9)		1.32	%(8)		1.40	%		0.83	%		0.52	%		0.28	%		0.28	%
Total expenses(7)		3.01	%(8)		3.13	%		2.65	%		2.39	%		2.24	%		2.27	%
Net investment income		6.45	%(8)		5.74	%		5.36	%		5.75	%		6.38	%		5.61	%
Portfolio Turnover		13	%(3)		26	%		34	%		42	%		31	%		33	%
Senior Securities:
Total notes payable outstanding (in 000’s)	$	108,000		$	103,000		$	93,000		$	92,000		$	25,000		$	60,000
Asset coverage per $1,000 of notes payable(10)	$	3,805		$	3,957		$	4,587		$	4,613		$	15,472		$	7,267
Total preferred shares outstanding		1,504			1,504			2,464			2,464			4,400			4,400
Asset coverage per preferred share(11)	$	70,562		$	72,464		$	68,989		$	69,078		$	71,629		$	64,119
Involuntary liquidation preference per preferred share(12)	$	25,000		$	25,000		$	25,000		$	25,000		$	25,000		$	25,000
Approximate market value per preferred share(12)	$	25,000		$	25,000		$	25,000		$	25,000		$	25,000		$	25,000

  ⁽¹⁾  Computed using average common shares outstanding.

   ⁽²⁾ Returns are historical and are calculated by determining the percentage change in net asset value or market value with all distributions reinvested. Distributions are assumed to be reinvested at prices obtained under the Trust’s dividend reinvestment plan.

  ⁽³⁾ Not annualized.

   ⁽⁴⁾ The total return based on net asset value reflects the impact of the tender and repurchase by the Trust of a portion of its Auction Preferred Shares at 92% of the per share liquidation preference. Absent this transaction, the total return based on net asset value would have been 3.71%.

   ⁽⁵⁾ The total return based on net asset value reflects the impact of the tender and repurchase by the Trust of a portion of its Auction Preferred Shares at 95% of the per share liquidation preference. Absent this transaction, the total return based on net asset value would have been 13.00%.

   ⁽⁶⁾ Ratios do not reflect the effect of dividend payments to preferred shareholders.

   ⁽⁷⁾ 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.

  ⁽⁸⁾ Annualized.

   ⁽⁹⁾ Interest and fee expense relates to the notes payable to partially redeem the Trust’s Auction Preferred Shares (see Note 2) and/or to fund investments (see Note 9).

⁽¹⁰⁾ Calculated by subtracting the Trust’s total liabilities (not including the notes payable and preferred shares) from the Trust’s total assets, and dividing the result by the notes payable balance in thousands.

⁽¹¹⁾ Calculated by subtracting the Trust’s total liabilities (not including the notes payable and preferred shares) from the Trust’s total assets, dividing the result by the sum of the value of the notes payable and liquidation value of the preferred shares, and multiplying the result by the liquidation value of one preferred share. Such amount equates to 282%, 290%, 276%, 276%, 287% and 256% at December 31, 2019 and June 30, 2019, 2018, 2017, 2016 and 2015, respectively.

⁽¹²⁾ Plus accumulated and unpaid dividends.

† Ratios based on net assets applicable to common shares plus preferred shares and borrowings are presented below. Ratios do not reflect the effect of dividend payments to preferred shareholders and exclude the effect of custody fee credits, if any. Ratios for periods less than one year are annualized.

	Six Months Ended December 31, 2019 (Unaudited)			Year Ended June 30,
				2019			2018			2017			2016			2015
Expenses excluding interest and fees		1.09	%		1.12	%		1.17	%		1.21	%		1.21	%		1.21	%
Interest and fee expense		0.85	%		0.91	%		0.54	%		0.34	%		0.17	%		0.17	%
Total expenses		1.94	%		2.03	%		1.71	%		1.55	%		1.38	%		1.38	%
Net investment income		4.16	%		3.73	%		3.46	%		3.72	%		3.93	%		3.42	%

36 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2019

Notes to Financial Statements (Unaudited)

1  Significant Accounting Policies

Eaton Vance Senior Income Trust (the Trust) is a Massachusetts business trust registered under the Investment Company Act of 1940, as amended (the 1940 Act), as a diversified, closed-end management investment company. The Trust’s investment objective is to provide a high level of current income, consistent with the preservation of capital, by investing primarily in senior, secured floating-rate loans.

The following is a summary of significant accounting policies of the Trust. The policies are in conformity with accounting principles generally accepted in the United States of America (U.S. GAAP). The Trust 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.

Senior Floating-Rate Loans. Interests in senior floating-rate loans (Senior Loans) for which reliable market quotations are readily available are valued generally at the average mean of bid and ask quotations obtained from a third party pricing service. Other Senior Loans are valued at fair value by the investment adviser under procedures approved by the Trustees. In fair valuing a Senior Loan, the investment adviser utilizes one or more of the valuation techniques described in (i) through (iii) below to assess the likelihood that the borrower will make a full repayment of the loan underlying such Senior Loan relative to yields on other Senior Loans issued by companies of comparable credit quality. If the investment adviser believes that there is a reasonable likelihood of full repayment, the investment adviser will determine fair value using a matrix pricing approach that considers the yield on the Senior Loan. If the investment adviser believes there is not a reasonable likelihood of full repayment, the investment adviser will determine fair value using analyses that include, but are not limited to: (i) a comparison of the value of the borrower’s outstanding equity and debt to that of comparable public companies; (ii) a discounted cash flow analysis; or (iii) when the investment adviser believes it is likely that a borrower will be liquidated or sold, an analysis of the terms of such liquidation or sale. In certain cases, the investment adviser will use a combination of analytical methods to determine fair value, such as when only a portion of a borrower’s assets are likely to be sold. In conducting its assessment and analyses for purposes of determining fair value of a Senior Loan, the investment adviser will use its discretion and judgment in considering and appraising relevant factors. Fair value determinations are made by the portfolio managers of the Trust based on information available to such managers. The portfolio managers of other funds managed by the investment adviser that invest in Senior Loans may not possess the same information about a Senior Loan borrower as the portfolio managers of the Trust. At times, the fair value of a Senior Loan determined by the portfolio managers of other funds managed by the investment adviser that invest in Senior Loans may vary from the fair value of the same Senior Loan determined by the portfolio managers of the Trust. The fair value of each Senior Loan is periodically reviewed and approved by the investment adviser’s Valuation Committee and by the Trustees based upon procedures approved by the Trustees. Junior Loans (i.e., subordinated loans and second lien loans) are valued in the same manner as Senior Loans.

Debt Obligations. Debt obligations are generally valued on the basis of valuations provided by third party pricing services, as derived from such services’ pricing models. Inputs to the models may include, but are not limited to, reported trades, executable bid and ask prices, broker/dealer quotations, prices or yields of securities with similar characteristics, interest rates, anticipated prepayments, benchmark curves or information pertaining to the issuer, as well as industry and economic events. The pricing services may use a matrix approach, which considers information regarding securities with similar characteristics to determine the valuation for a security. Short-term debt obligations purchased with a remaining maturity of sixty days or less for which a valuation from a third party pricing service is not readily available may be valued at amortized cost, which approximates fair value.

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 or, in the case of preferred equity securities that are not listed or traded in the over-the-counter market, by a third party pricing service that uses various techniques that consider factors including, but not limited to, prices or yields of securities with similar characteristics, benchmark yields, broker/dealer quotes, quotes of underlying common stock, issuer spreads, as well as industry and economic events.

Derivatives. Forward foreign currency exchange contracts are generally valued at the mean of the average bid and average ask prices that are reported by currency dealers to a third party pricing service at the valuation time. Such third party pricing service valuations are supplied for specific settlement periods and the Trust’s forward foreign currency exchange contracts are valued at an interpolated rate between the closest preceding and subsequent settlement period reported by the third party pricing service.

Foreign Securities and Currencies. Foreign securities and currencies are valued in U.S. dollars, based on foreign currency exchange rate quotations supplied by a third party pricing service. The pricing service uses a proprietary model to determine the exchange rate. Inputs to the model include reported trades and implied bid/ask spreads.

Affiliated Fund. The Trust 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 Rule 2a-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 Trust in a manner that most fairly reflects the security’s “fair value”, which is the amount that the Trust might reasonably expect to receive for the security upon its current sale in the ordinary course. Each such determination is based

37

Eaton Vance

Senior Income Trust

December 31, 2019

Notes to Financial Statements (Unaudited) — continued

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 — Interest income is recorded on the basis of interest accrued, adjusted for amortization of premium or accretion of discount. Fees associated with loan amendments are recognized immediately. Dividend income is recorded on the ex-dividend date for dividends received in cash and/or securities. Distributions from investment companies are recorded as dividend income, capital gains or return of capital based on the nature of the distribution.

D  Federal Taxes — The Trust’s policy is to comply with the provisions of the Internal Revenue Code applicable to regulated investment companies and to distribute to shareholders each year substantially all of its net investment income, and all or substantially all of its net realized capital gains. Accordingly, no provision for federal income or excise tax is necessary.

As of December 31, 2019, the Trust had no uncertain tax positions that would require financial statement recognition, de-recognition, or disclosure. The Trust files a U.S. federal income tax return annually after its fiscal year-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 — Investment valuations, other assets, and liabilities initially expressed in foreign currencies are translated each business day into U.S. dollars based upon current exchange rates. Purchases and sales of foreign investment securities and 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. Recognized gains or losses on investment transactions attributable to changes in foreign currency exchange rates are recorded for financial statement purposes as net realized gains and losses on investments. That portion of unrealized gains and losses on investments that results from fluctuations in foreign currency exchange rates is not separately disclosed.

F  Unfunded Loan Commitments — The Trust may enter into certain loan agreements all or a portion of which may be unfunded. The Trust is obligated to fund these commitments at the borrower’s discretion. These commitments are disclosed in the accompanying Portfolio of Investments. At December 31, 2019, the Trust had sufficient cash and/or securities to cover these commitments.

G  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.

H  Indemnifications — Under the Trust’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 Trust. Under Massachusetts law, if certain conditions prevail, shareholders of a Massachusetts business trust (such as the Trust) could be deemed to have personal liability for the obligations of the Trust. However, the Trust’s Declaration of Trust contains an express disclaimer of liability on the part of Trust shareholders and the By-laws provide that the Trust shall assume, upon request by the shareholder, the defense on behalf of any Trust shareholders. Moreover, the By-laws also provide for indemnification out of Trust property of any shareholder held personally liable solely by reason of being or having been a shareholder for all loss or expense arising from such liability. Additionally, in the normal course of business, the Trust enters into agreements with service providers that may contain 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.

I  Forward Foreign Currency Exchange Contracts — The Trust may enter into forward foreign currency exchange contracts for the purchase or sale of a specific foreign currency at a fixed price on a future date. The forward foreign currency exchange contracts are adjusted by the daily exchange rate of the underlying currency and any gains or losses are recorded as unrealized until such time as the contracts have been closed. Risks may arise upon entering these contracts from the potential inability of counterparties to meet the terms of their contracts and from movements in the value of a foreign currency relative to the U.S. dollar.

J  When-Issued Securities and Delayed Delivery Transactions — The Trust may purchase or sell securities on a delayed delivery or when-issued basis. Payment and delivery may take place after the customary settlement period for that security. At the time the transaction is negotiated, the price of the security that will be delivered is fixed. The Trust maintains cash and/or security positions for these commitments such that sufficient liquid assets will be available to make payments upon settlement. Securities purchased on a delayed delivery or when-issued basis are marked-to-market daily and begin earning interest on settlement date. Losses may arise due to changes in the market value of the underlying securities or if the counterparty does not perform under the contract.

K  Interim Financial Statements — The interim financial statements relating to December 31, 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 Trust’s management, reflect all adjustments, consisting only of normal recurring adjustments, necessary for the fair presentation of the financial statements.

38

Eaton Vance

Senior Income Trust

December 31, 2019

Notes to Financial Statements (Unaudited) — continued

2  Auction Preferred Shares

The Trust issued Auction Preferred Shares (APS) on July 27, 2001 in a public offering. Dividends on the APS, which accrue daily, are cumulative at rates which are reset every seven days by an auction, unless a special dividend period has been set. Series of APS are identical in all respects except for the reset dates of the dividend rates. If the APS auctions do not successfully clear, the dividend payment rate over the next period for the APS holders is set at a specified maximum applicable rate until such time as the APS auctions are successful. Auctions have not cleared since February 13, 2008 and the rate since that date has been the maximum applicable rate (see Note 3). The maximum applicable rate on the APS is 125% of the “AA” Financial Composite Commercial Paper Rate at the date of the auction. The stated spread over the reference benchmark rate is determined based on the credit rating of the APS.

The number of APS issued and outstanding as of December 31, 2019 is as follows:

	APS Issued and Outstanding
Series A		752
Series B		752

The APS are redeemable at the option of the Trust at a redemption price equal to $25,000 per share, plus accumulated and unpaid dividends, on any dividend payment date. The APS are also subject to mandatory redemption at a redemption price equal to $25,000 per share, plus accumulated and unpaid dividends, if the Trust is in default for an extended period on its asset maintenance requirements with respect to the APS. If the dividends on the APS remain unpaid in an amount equal to two full years’ dividends, the holders of the APS as a class have the right to elect a majority of the Board of Trustees. In general, the holders of the APS and the common shares have equal voting rights of one vote per share, except that the holders of the APS, as a separate class, have the right to elect at least two members of the Board of Trustees. The APS have a liquidation preference of $25,000 per share, plus accumulated and unpaid dividends. The Trust is required to maintain certain asset coverage with respect to the APS as defined in the Trust’s By-Laws and the 1940 Act. The Trust pays an annual fee up to 0.15% of the liquidation value of the APS to broker/dealers as a service fee if the auctions are unsuccessful; otherwise, the annual fee is 0.25%.

On June 29, 2018, the Trust announced a tender offer to purchase up to 39% of its outstanding APS at a price per share equal to 92% of the APS liquidation preference of $25,000 per share (or $23,000 per share), plus any accrued but unpaid APS dividends. The tender offer expired on September 14, 2018. The number of APS redeemed during the year ended June 30, 2019 pursuant to the tender offer and the redemption amount (excluding the final dividend payment) were as follows:

	APS Redeemed During the Year		Redemption Amount
Series A		480	$	11,040,000
Series B		480		11,040,000

3  Distributions to Shareholders and Income Tax Information

The Trust intends to make monthly distributions of net investment income to common shareholders, after payment of any dividends on any outstanding APS. In addition, at least annually, the Trust intends to distribute all or substantially all of its net realized capital gains. Distributions to common shareholders are recorded on the ex-dividend date. Distributions to preferred shareholders are recorded daily and are payable at the end of each dividend period. The dividend rates for the APS at December 31, 2019, and the amount of dividends accrued (including capital gains, if any) to APS shareholders, average APS dividend rates (annualized), and dividend rate ranges for the six months then ended were as follows:

	APS Dividend Rates at December 31, 2019			Dividends Accrued to APS Shareholders		Average APS Dividend Rates			Dividend Rate Ranges (%)
Series A		2.00	%	$	234,089		2.48	%		1.93–2.99
Series B		1.95			230,454		2.44			1.93–2.99

Beginning February 13, 2008 and consistent with the patterns in the broader market for auction-rate securities, the Trust’s APS auctions were unsuccessful in clearing due to an imbalance of sell orders over bids to buy the APS. As a result, the dividend rates of the APS were reset to the maximum applicable rates. The table above reflects such maximum dividend rate for each series as of December 31, 2019.

39

Eaton Vance

Senior Income Trust

December 31, 2019

Notes to Financial Statements (Unaudited) — continued

Distributions to shareholders are determined in accordance with income tax regulations, which may differ from U.S. GAAP. As required by U.S. GAAP, only distributions in excess of tax basis earnings and profits are reported in the financial statements as a return of capital. Permanent differences between book and tax accounting relating to distributions are reclassified to paid-in capital. For tax purposes, distributions from short-term capital gains are considered to be from ordinary income.

At June 30, 2019, the Trust had a net capital loss of $1,431,100 attributable to security transactions incurred after October 31, 2018 that it has elected to defer. This net capital loss is treated as arising on the first day of the Trust’s taxable year ending June 30, 2020.

The cost and unrealized appreciation (depreciation) of investments, including open derivative contracts, of the Trust at December 31, 2019, as determined on a federal income tax basis, were as follows:

Aggregate cost	$	419,541,337
Gross unrealized appreciation	$	4,946,594
Gross unrealized depreciation		(14,523,663	)
Net unrealized depreciation	$	(9,577,069	)

4  Investment Adviser Fee and Other Transactions with Affiliates

The investment adviser fee is earned by EVM as compensation for management and investment advisory services rendered to the Trust. Pursuant to the investment advisory agreement between the Trust and EVM, the investment advisory fee payable by the Trust is 0.85% of the Trust’s average weekly gross assets and is payable monthly. Pursuant to a fee reduction agreement between the Trust and EVM that commenced on May 1, 2010, the annual investment adviser fee is reduced by 0.01% every May 1 thereafter for the next twenty-nine years. The Trust’s advisory fee is currently computed at an annual rate of 0.75% of its average weekly gross assets and is payable monthly. The fee reduction cannot be terminated without the consent of the Trustees and shareholders. For the six months ended December 31, 2019, the Trust’s investment adviser fee totaled $1,550,492. The Trust invests its cash in Cash Reserves Fund. EVM does not currently receive a fee for advisory services provided to Cash Reserves Fund. The administration fee is earned by EVM for administering the business affairs of the Trust and is computed at an annual rate of 0.25% of the Trust’s average weekly gross assets. For the six months ended December 31, 2019, the administration fee amounted to $516,831.

Trustees and officers of the Trust who are members of EVM’s organization receive remuneration for their services to the Trust out of the investment adviser fee. Trustees of the Trust who are not affiliated with EVM 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 December 31, 2019, no significant amounts have been deferred. Certain officers and Trustees of the Trust are officers of EVM.

5  Purchases and Sales of Investments

Purchases and sales of investments, other than short-term obligations and including maturities, paydowns and principal repayments on Senior Loans, aggregated $54,514,364 and $59,026,962, respectively, for the six months ended December 31, 2019.

6  Common Shares of Beneficial Interest and Shelf Offering

The Trust may issue common shares pursuant to its dividend reinvestment plan. There were no common shares issued by the Trust for the six months ended December 31, 2019 and the year ended June 30, 2019.

In November 2013, the Board of Trustees initially approved a share repurchase program for the Trust. Pursuant to the reauthorization of the share repurchase program by the Board of Trustees in March 2019, the Trust is authorized to repurchase up to 10% of its common shares outstanding as of the last day of the prior calendar year at market prices when shares are trading at a discount to net asset value. The share repurchase program does not obligate the Trust to purchase a specific amount of shares. There were no repurchases of common shares by the Trust for the six months ended December 31, 2019 and the year ended June 30, 2019.

Pursuant to a registration statement filed with the SEC, the Trust is authorized to issue up to an additional 4,551,438 common shares through an equity shelf offering program (the “shelf offering”). Under the shelf offering, the Trust, subject to market conditions, may raise additional capital from time to time and in varying amounts and offering methods at a net price at or above the Trust’s net asset value per common share. During the six months ended December 31, 2019 and the year ended June 30, 2019, there were no shares sold by the Trust pursuant to its shelf offering.

40

Eaton Vance

Senior Income Trust

December 31, 2019

Notes to Financial Statements (Unaudited) — continued

7  Restricted Securities

At December 31, 2019, the Trust owned the following securities (representing less than 0.01% of net assets applicable to common shares) which were restricted as to public resale and not registered under the Securities Act of 1933 (excluding Rule 144A securities). The Trust has various registration rights (exercisable under a variety of circumstances) with respect to these securities. The value of these securities is determined based on valuations provided by brokers when available, or if not available, they are valued at fair value using methods determined in good faith by or at the direction of the Trustees.

Description	Date of Acquisition		Shares		Cost		Value
Common Stocks
Nine Point Energy Holdings, Inc.		7/15/14		325	$	15,070	$	3
Convertible Preferred Stocks
Nine Point Energy Holdings, Inc., Series A, 12.00%		5/26/17		5		5,000		2,889
Total Restricted Securities					$	20,070	$	2,892

8  Financial Instruments

The Trust may trade in financial instruments with off-balance sheet risk in the normal course of its investing activities. These financial instruments may include forward foreign currency exchange contracts and may involve, to a varying degree, elements of risk in excess of the amounts recognized for financial statement purposes. The notional or contractual amounts of these instruments represent the investment the Trust has in particular classes of financial instruments and do not necessarily represent the amounts potentially subject to risk. The measurement of the risks associated with these instruments is meaningful only when all related and offsetting transactions are considered. A summary of obligations under these financial instruments at December 31, 2019 is included in the Portfolio of Investments. At December 31, 2019, the Trust had sufficient cash and/or securities to cover commitments under these contracts.

The Trust is subject to foreign exchange risk in the normal course of pursuing its investment objective. Because the Trust holds foreign currency denominated investments, the value of these investments and related receivables and payables may change due to future changes in foreign currency exchange rates. To hedge against this risk, the Trust enters into forward foreign currency exchange contracts.

The Trust enters into forward foreign currency exchange contracts that may contain provisions whereby the counterparty may terminate the contract under certain conditions, including but not limited to a decline in the Trust’s net assets below a certain level over a certain period of time, which would trigger a payment by the Trust for those derivatives in a liability position. At December 31, 2019, the fair value of derivatives with credit-related contingent features in a net liability position was $258,390. The aggregate fair value of assets pledged as collateral by the Trust for such liability was $150,000 at December 31, 2019.

The over-the-counter (OTC) derivatives in which the Trust invests are subject to the risk that the counterparty to the contract fails to perform its obligations under the contract. To mitigate this risk, the Trust has entered into an International Swaps and Derivatives Association, Inc. Master Agreement (“ISDA Master Agreement”) or similar agreement with substantially all its derivative counterparties. An ISDA Master Agreement is a bilateral agreement between the Trust and a counterparty that governs certain OTC derivatives and typically contains, among other things, set-off provisions in the event of a default and/or termination event as defined under the relevant ISDA Master Agreement. Under an ISDA Master Agreement, the Trust may, under certain circumstances, offset with the counterparty certain derivative financial instruments’ payables and/or receivables with collateral held and/or posted and create one single net payment. The provisions of the ISDA Master Agreement typically permit a single net payment in the event of default including the bankruptcy or insolvency of the counterparty. However, bankruptcy or insolvency laws of a particular jurisdiction may impose restrictions on or prohibitions against the right of offset in bankruptcy or insolvency. Certain ISDA Master Agreements allow counterparties to OTC derivatives to terminate derivative contracts prior to maturity in the event the Trust’s net assets decline by a stated percentage or the Trust fails to meet the terms of its ISDA Master Agreements, which would cause the counterparty to accelerate payment by the Trust of any net liability owed to it.

The collateral requirements for derivatives traded under an ISDA Master Agreement are governed by a Credit Support Annex to the ISDA Master Agreement. Collateral requirements are determined at the close of business each day and are typically based on changes in market values for each transaction under an ISDA Master Agreement and netted into one amount for such agreement. Generally, the amount of collateral due from or to a counterparty is subject to a minimum transfer threshold amount before a transfer is required, which may vary by counterparty. Collateral pledged for the benefit of the Trust and/or counterparty is held in segregated accounts by the Trust’s custodian and cannot be sold, re-pledged, assigned or otherwise used while pledged. The portion of such collateral representing cash, if any, is reflected as deposits for derivatives collateral and, in the case of cash pledged by a counterparty for the benefit of the Trust, a corresponding liability on the Statement of Assets and Liabilities. Securities pledged by the Trust as collateral, if any, are identified as such in the Portfolio of Investments.

41

Eaton Vance

Senior Income Trust

December 31, 2019

Notes to Financial Statements (Unaudited) — continued

The fair value of open derivative instruments (not considered to be hedging instruments for accounting disclosure purposes) and whose primary underlying risk exposure is foreign exchange risk at December 31, 2019 was as follows:

	Fair Value
Derivative	Asset Derivative		Liability Derivative(1)
Forward foreign currency exchange contracts	$	—	$	(258,390	)

⁽¹⁾  Statement of Assets and Liabilities location: Payable for open forward foreign currency exchange contracts.

The Trust’s derivative liabilities at fair value by type, which are reported gross in the Statement of Assets and Liabilities, are presented in the table above. The following table presents the Trust’s derivative liabilities by counterparty, net of amounts available for offset under a master netting agreement and net of the related collateral pledged by the Trust for such liabilities as of December 31, 2019.

Counterparty	Derivative Liabilities Subject to Master Netting Agreement			Derivatives Available for Offset		Non-cash Collateral Pledged(a)		Cash Collateral Pledged(a)		Net Amount of Derivative Liabilities(b)			Total Cash Collateral Pledged
Goldman Sachs International	$	(35,112	)	$	—	$	—	$	—	$	(35,112	)	$	—
HSBC Bank USA, N.A.		(93,512	)		—		—		93,512		—			150,000
State Street Bank and Trust Company		(129,766	)		—		—		—		(129,766	)		—
	$	(258,390	)	$	—	$	—	$	93,512	$	(164,878	)	$	150,000

^(a)   In some instances, the total collateral pledged may be more than the amount shown due to overcollateralization.

^(b)  Net amount represents the net amount payable to the counterparty in the event of default.

The effect of derivative instruments (not considered to be hedging instruments for accounting disclosure purposes) on the Statement of Operations and whose primary underlying risk exposure is foreign exchange risk for the six months ended December 31, 2019 was as follows:

Derivative	Realized Gain (Loss) on Derivatives Recognized in Income(1)		Change in Unrealized Appreciation (Depreciation) on Derivatives Recognized in  Income(2)
Forward foreign currency exchange contracts	$	730,851	$	(80,435	)

⁽¹⁾  Statement of Operations location: Net realized gain (loss) – Forward foreign currency exchange contracts.

⁽²⁾  Statement of Operations location: Change in unrealized appreciation (depreciation) – Forward foreign currency exchange contracts.

The average notional amount of forward foreign currency exchange contracts (based on the absolute value of notional amounts of currency purchased and currency sold) outstanding during the six months ended December 31, 2019, which is indicative of the volume of this derivative type, was approximately $26,113,000.

9  Revolving Credit and Security Agreement

The Trust has entered into a Revolving Credit and Security Agreement, as amended (the Agreement) with conduit lenders and a bank that allows it to borrow up to $125 million and to invest the borrowings in accordance with its investment practices. Borrowings under the Agreement are secured by the assets of the Trust. Interest is charged at a rate above the conduits’ commercial paper issuance rate and is payable monthly. Under the terms of the Agreement, in effect through March 9, 2020, the Trust also pays a program fee of 0.85% per annum on its outstanding borrowings to administer the facility and a liquidity fee of 0.15% (0.25% if the outstanding loan amount is less than or equal to 60% of the total facility size) per annum on the unused portion of the total commitment under the Agreement. Program and liquidity fees for the six months ended December 31, 2019 totaled $482,759 and are included in interest expense and fees on the Statement of Operations. The Trust paid an upfront fee of $125,000 in connection with the renewal of the Agreement in March 2019, which is being amortized to interest expense over a period of one year. The unamortized balance as of December 31, 2019 is approximately $24,000 and is included in prepaid upfront fees on notes payable on the Statement of Assets and Liabilities. The Trust is required to maintain certain net asset levels during the term of the Agreement. At December 31, 2019, the Trust had borrowings outstanding under the Agreement of

42

Eaton Vance

Senior Income Trust

December 31, 2019

Notes to Financial Statements (Unaudited) — continued

$108,000,000 at an annual interest rate of 1.83%. Based on the short-term nature of the borrowings under the Agreement and the variable interest rate, the carrying amount of the borrowings at December 31, 2019 approximated its fair value. If measured at fair value, borrowings under the Agreement would have been considered as Level 2 in the fair value hierarchy (see Note 13) at December 31, 2019. For the six months ended December 31, 2019, the average borrowings under the Agreement and the average annual interest rate (excluding fees) were $108,146,739 and 2.21%, respectively.

10  Risks Associated with Foreign Investments

Investing in securities issued by companies whose principal business activities are outside the United States may involve significant risks not present in domestic investments. For example, there is generally less publicly available information about foreign companies, particularly those not subject to the disclosure and reporting requirements of the U.S. securities laws. Certain foreign issuers are generally not bound by uniform accounting, auditing, and financial reporting requirements and standards of practice comparable to those applicable to domestic issuers. Investments in foreign securities also involve the risk of possible adverse changes in investment or exchange control regulations, expropriation or confiscatory taxation, limitation on the removal of funds or other assets of the Trust, political or financial instability or diplomatic and other developments which could affect such investments. Foreign securities markets, while growing in volume and sophistication, are generally not as developed as those in the United States, and securities of some foreign issuers (particularly those located in developing countries) may be less liquid and more volatile than securities of comparable U.S. companies. In general, there is less overall governmental supervision and regulation of foreign securities markets, broker/dealers and issuers than in the United States.

11  Credit Risk

The Trust invests primarily in below investment grade floating-rate loans, which are considered speculative because of the credit risk of their issuers. Changes in economic conditions or other circumstances are more likely to reduce the capacity of issuers of these securities to make principal and interest payments. Such companies are more likely to default on their payments of interest and principal owed than issuers of investment grade bonds. An economic downturn generally leads to a higher non-payment rate, and a loan or other debt obligation may lose significant value before a default occurs. Lower rated investments also may be subject to greater price volatility than higher rated investments. Moreover, the specific collateral used to secure a loan may decline in value or become illiquid, which would adversely affect the loan’s value.

12  Investments in Affiliated Funds

At December 31, 2019, the value of the Trust’s investment in affiliated funds was $5,500,458, which represents 2.1% of the Trust’s net assets applicable to common shares. Transactions in affiliated funds by the Trust for the six months ended December 31, 2019 were as follows:

Name of affiliated fund	Value, beginning of period		Purchases		Sales proceeds			Net realized gain (loss)			Change in unrealized appreciation (depreciation)		Value, end of period		Dividend income		Units, end of period
Short-Term Investments
Eaton Vance Cash Reserves Fund, LLC, 1.78%	$	3,194,436	$	61,627,037	$	(59,320,138	)	$	(879	)	$	2	$	5,500,458	$	73,372		5,500,458

13  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.

43

Eaton Vance

Senior Income Trust

December 31, 2019

Notes to Financial Statements (Unaudited) — continued

At December 31, 2019, the hierarchy of inputs used in valuing the Trust’s investments and open derivative instruments, which are carried at value, were as follows:

Asset Description	Level 1		Level 2			Level 3*		Total
Senior Floating-Rate Loans (Less Unfunded Loan Commitments)	$	—	$	345,565,489		$	2,092,375	$	347,657,864
Corporate Bonds & Notes		—		30,059,339			—		30,059,339
Asset-Backed Securities		—		17,549,891			—		17,549,891
Common Stocks		981,091		967,489			2,311,149		4,259,729
Convertible Preferred Stocks		—		—			2,889		2,889
Preferred Stocks		—		—			128,183		128,183
Closed-End Funds		5,056,436		—			—		5,056,436
Warrants		—		—			0		0
Miscellaneous		—		7,869			0		7,869
Short-Term Investments		—		5,500,458			—		5,500,458
Total Investments	$	6,037,527	$	399,650,535		$	4,534,596	$	410,222,658
Liability Description
Forward Foreign Currency Exchange Contracts	$	—	$	(258,390	)	$	—	$	(258,390	)
Total	$	—	$	(258,390	)	$	—	$	(258,390	)

* None of the unobservable inputs for Level 3 assets, individually or collectively, had a material impact on the Trust.

Level 3 investments at the beginning and/or end of the period in relation to net assets were not significant and accordingly, a reconciliation of Level 3 assets for the six months ended December 31, 2019 is not presented.

44

Eaton Vance

Senior Income Trust

December 31, 2019

Annual Meeting of Shareholders (Unaudited)

The Fund held its Annual Meeting of Shareholders on October 17, 2019. The following action was taken by the shareholders:

Item 1:  The election of George J. Gorman, William H. Park and Marcus L. Smith as Class III Trustees of the Fund for a three-year term expiring in 2022. Mr. Park was elected solely by APS shareholders.

Nominee for Trustee Elected by All Shareholders	Number of Shares
	For		Withheld
George J. Gorman		25,992,213		6,661,348
Marcus L. Smith		26,087,256		6,566,305
Nominee for Trustee Elected by APS Shareholders	Number of Shares
	For		Withheld
William H. Park		1,282		4

45

Eaton Vance

Senior Income Trust

December 31, 2019

Officers and Trustees

Officers

Payson F. Swaffield

President

Maureen A. Gemma

Vice President, Secretary and Chief Legal Officer

James F. Kirchner

Treasurer

Richard F. Froio

Chief Compliance Officer

Trustees

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

Marcus L. Smith

Susan J. Sutherland

Scott E. Wennerholm

* Interested Trustee

46

Eaton Vance Funds

IMPORTANT NOTICES

Privacy.  The Eaton Vance organization is committed to ensuring your financial privacy. Each entity listed below has adopted a privacy policy and procedures (“Privacy Program”) Eaton Vance believes is reasonably designed to protect your personal information and to govern when and with whom Eaton Vance may share your personal information.

• At the time of opening an account, Eaton Vance generally requires you to provide us with certain information such as name, address, social security number, tax status, account numbers, and account balances. This information is necessary for us to both open an account for you and to allow us to satisfy legal requirements such as applicable anti-money laundering reviews and know-your-customer requirements.

• On an ongoing basis, in the normal course of servicing your account, Eaton Vance may share your information with unaffiliated third parties that perform various services for Eaton Vance and/or your account. These third parties include transfer agents, custodians, broker/dealers and our professional advisers, including auditors, accountants, and legal counsel. Eaton Vance may additionally share your personal information with our affiliates.

• We believe our Privacy Program is reasonably designed to protect the confidentiality of your personal information and to prevent unauthorized access to that information.

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

Our pledge of protecting your personal information 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 Limited, Eaton Vance Global Advisors Limited, Eaton Vance Management’s Real Estate Investment Group, Boston Management and Research, Calvert Research and Management, and Calvert Funds. This Privacy Notice supersedes all previously issued privacy disclosures. For more information about our Privacy Program or about how your personal information may be used, please call 1-800-262-1122.

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. American Stock Transfer & Trust Company, LLC (“AST”), the closed-end funds transfer agent, or your financial intermediary, may household the mailing of your documents indefinitely unless you instruct AST, or your financial intermediary, otherwise. If you would prefer that your Eaton Vance documents not be householded, please contact AST or your financial intermediary. Your instructions that householding not apply to delivery of your Eaton Vance documents will typically be effective within 30 days of receipt by AST or your financial intermediary.

Portfolio Holdings.  Each Eaton Vance Fund and its underlying Portfolio(s) (if applicable) files a schedule of portfolio holdings on Part F to Form N-PORT with the SEC for the first and third quarters of each fiscal year. The Form N-PORT will be available on the Eaton Vance website at www.eatonvance.com, by calling Eaton Vance at 1-800-262-1122 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 recent 12-month period ended June 30, without charge, upon request, by calling 1-800-262-1122 and by accessing the SEC’s website at www.sec.gov.

Share Repurchase Program.  The Fund’s Board of Trustees has approved a share repurchase program authorizing the Fund to repurchase up to 10% of its common shares outstanding as of the last day of the prior calendar year in open-market transactions at a discount to net asset value. The repurchase program does not obligate the Fund to purchase a specific amount of shares. The Fund’s repurchase activity, including the number of shares purchased, average price and average discount to net asset value, is disclosed in the Fund’s annual and semi-annual reports to shareholders.

Additional Notice to Shareholders.  If applicable, a Fund may also redeem or purchase its outstanding preferred shares in order to maintain compliance with regulatory requirements, borrowing or rating agency requirements or for other purposes as it deems appropriate or necessary.

Closed-End Fund Information.  Eaton Vance closed-end funds make fund performance data and certain information about portfolio characteristics available on the Eaton Vance website shortly after the end of each month. Other information about the funds is available on the website. The funds’ net asset value per share is readily accessible on the Eaton Vance website. Portfolio holdings for the most recent month-end are also posted to the website approximately 30 days following the end of the month. This information is available at www.eatonvance.com on the fund information pages under “Individual Investors — Closed-End Funds”.

47

This Page Intentionally Left Blank

Investment Adviser and Administrator

Eaton Vance Management

Two International Place

Boston, MA 02110

Custodian

State Street Bank and Trust Company

State Street Financial Center, One Lincoln Street

Boston, MA 02111

Transfer Agent

American Stock Transfer & Trust Company, LLC

6201 15^th Avenue

Brooklyn, NY 11219

Fund Offices

Two International Place

Boston, MA 02110

7700    12.31.19

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 required in this filing.

Item 6. Schedule of Investments

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

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

Not required in this filing.

Item 8. Portfolio Managers of Closed-End Management Investment Companies

Not required in this filing.

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

No such purchases this period.

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 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 for Closed-End Management Investment Companies

No activity to report for the registrant’s most recent fiscal year end.

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.

Eaton Vance Senior Income Trust

By:	/s/ Payson F. Swaffield
	Payson F. Swaffield
	President

Date:    February 24, 2020

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:    February 24, 2020

By:	/s/ Payson F. Swaffield
	Payson F. Swaffield
	President

Date:    February 24, 2020