Groowe Groowe BETA / Newsroom
⏱ News is delayed by 15 minutes. Sign in for real-time access. Sign in

Form 8-K

sec.gov

8-K — Sixth Street Specialty Lending, Inc.

Accession: 0001193125-26-332772

Filed: 2026-08-04

Period: 2026-08-04

CIK: 0001508655

Item: Results of Operations and Financial Condition

Item: Regulation FD Disclosure

Item: Financial Statements and Exhibits

Documents

8-K — tslx-20260804.htm (Primary)

EX-99.1 (tslx-ex99_1.htm)

GRAPHIC (img52863034_0.jpg)

GRAPHIC (img52863034_1.jpg)

XML — IDEA: XBRL DOCUMENT (R1.htm)

8-K

8-K (Primary)

Filename: tslx-20260804.htm · Sequence: 1

8-K

0001508655false00015086552026-08-042026-08-04

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): August 4, 2026

Sixth Street Specialty Lending, Inc.

(Exact name of registrant as specified in charter)

Delaware

001-36364

27-3380000

(State or Other Jurisdiction

of Incorporation)

(Commission

File Number)

(I.R.S. Employer

Identification No.)

2100 McKinney Avenue, Suite 1500

Dallas, TX

75201

(Address of Principal Executive Offices)

(zip code)

Registrant’s telephone number, including area code: (469) 621-3001

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2 below):

☐

Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐

Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐

Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐

Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading Symbol(s)

Name of each exchange on which registered

Common Stock, par value $0.01 per share

TSLX

The New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02 – Results of Operations and Financial Condition

On August 4, 2026, Sixth Street Specialty Lending, Inc. (the “Company”) issued a press release announcing its financial results for the three months ended June 30, 2026. The text of the press release is included as Exhibit 99.1 to this Form 8-K.

The information disclosed under this Item 2.02, including Exhibit 99.1 hereto, is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934 and shall not be deemed incorporated by reference into any filing made under the Securities Act of 1933, except as expressly set forth by specific reference in such filing.

Item 7.01 – Regulation FD Disclosure

On August 4, 2026, the Company issued a press release, included herewith as Exhibit 99.1, announcing the declaration of a third quarter 2026 base dividend per share of $0.42 to shareholders of record as of September 15, 2026, payable on September 30, 2026.

The information disclosed under this Item 7.01, including Exhibit 99.1 hereto, is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, and shall not be deemed incorporated by reference into any filing made under the Securities Act of 1933, except as expressly set forth by specific reference in such filing.

Item 9.01 – Financial Statements and Exhibits

(d) Exhibits:

Exhibit

Number

Description

99.1

Press Release, dated August 4, 2026

104

The cover page of this Current Report on Form 8-K, formatted in Inline XBRL

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

SIXTH STREET SPECIALTY LENDING, INC.

(Registrant)

Date: August 4, 2026

By:

/s/ Ian Simmonds

Ian Simmonds

Chief Financial Officer

EX-99.1

EX-99.1

Filename: tslx-ex99_1.htm · Sequence: 2

EX-99.1

Exhibit 99.1

k

SECOND QUARTER 2026 EARNINGS RESULTS

Sixth Street Specialty Lending, Inc. Reports Second Quarter Results; Declares a Third Quarter Base Dividend Per Share of $0.42

NEW YORK — August 4, 2026 — Sixth Street Specialty Lending, Inc. (NYSE: TSLX, or the “Company”) today reported net investment income of $0.43 per share and net income of $0.43 per share for the second quarter ended June 30, 2026. These results correspond to an annualized return on equity (ROE) on net investment income and net income of 10.6% and 10.5%, respectively.

Reported net asset value (NAV) per share was $16.24 at June 30, 2026 as compared to $16.24 at March 31, 2026. Net asset value per share was unchanged this quarter, as net investment income of $0.43 per share was substantially offset by the second quarter base dividend of $0.42 per share. Net changes in the fair value of the portfolio were modest in aggregate, with $0.04 per share of net unrealized losses attributable to credit spread movements largely offset by $0.06 per share of net unrealized gains attributable to movement in equity market multiples and $0.01 per share of net realized gains.

The Company announced that its Board of Directors has declared a third quarter 2026 base dividend of $0.42 per share to shareholders of record as of September 15, 2026, payable on September 30, 2026. There was no supplemental dividend related to Q2 earnings. The supplemental dividend policy remains in place to distribute over-earning to shareholders based on the existing framework.

On May 1, 2026, the Company completed an amendment to its Revolving Credit Facility, which extended the stated maturity date to May 1, 2031 for $1.525 billion of commitments. The pricing and other material terms of the facility remain unchanged.

Subsequent to quarter-end, the Company repaid its $300 million August 1, 2026 unsecured notes through a combination of utilization of undrawn capacity on its revolving credit facility and cash on the balance sheet.

Net Investment Income Per Share

Q2 2026:

$0.43

Net Income Per Share

Q2 2026:

$0.43

Return on Equity

Q2 2026 (NII):

10.6%

Q2 2026 (NI):

10.5%

NAV

Q2 2026 ($MM):

$1,548.6

Q2 2026 (per share):

$16.24

Dividends Declared (per share)

Q2 2026 (Base):

$0.42

LTM Q2 2026 (Base):

$1.80

LTM Q2 2026 (Supplemental):

$0.09

LTM Q2 2026 (Total):

$1.89

1

Portfolio and Investment Activity

For the quarter ended June 30, 2026, new investment commitments totaled $114.6 million. This compares to $338.1 million for the quarter ended March 31, 2026. For the quarter ended June 30, 2026, the principal amount of new investments funded was $136.7 million across two new portfolio companies and additional capital called by the previously announced joint venture, Structured Credit Partners or SCP. For this period, the Company had $192.1 million aggregate principal amount in exits and repayments. For the quarter ended March 31, 2026, the principal amount of new investments funded was $134.8 million across two new portfolio companies, four upsizes to existing portfolio companies and an initial investment in SCP. For this period, the Company had $113.0 million aggregate principal amount in exits and repayments.

The Company had investments in 1371 and 1432 portfolio companies as of June 30, 2026 and March 31, 2026 with an aggregate fair value of $3,302.1 million and $3,313.4 million, respectively. As of June 30, 2026, the average investment size in each portfolio company was $30.9 million based on fair value.

As of June 30, 2026, the Company’s portfolio based on fair value consisted of 88.3% first-lien debt investments, 0.7% second-lien debt investments, 2.0% mezzanine debt investments, 4.7% equity investments, 2.7% structured credit investments and 1.6% joint venture investments. As of March 31, 2026, the Company’s portfolio based on fair value consisted of 89.3% first-lien debt investments, 1.0% second-lien debt investments, 1.9% mezzanine debt investments, 4.6% equity investments, 2.8% structured credit investments and 0.4% joint venture investments.

As of June 30, 2026, 96.1% of debt investments3 based on fair value in the portfolio bore interest at floating rates with 100.0% of these subject to reference rate floors. The Company’s credit facilities also bear interest at floating rates. In connection with the Company’s Unsecured Notes, which bear interest at fixed rates, the Company has entered into fixed-to-floating interest rate swaps in order to align the nature of the interest rates of its liabilities with its investment portfolio.

As of June 30, 2026 and March 31, 2026, the weighted average total yield of debt and income-producing securities at fair value (which includes interest income and amortization of fees and discounts) was 11.1% and 11.1%, respectively, and the weighted average total yield of debt and income-producing securities at amortized cost (which includes interest income and amortization of fees and discounts) was 11.2% and 11.2%, respectively.

As of June 30, 2026 and March 31, 2026, 1.3% and 1.4% of the portfolio at fair value was on non-accrual status, respectively. There were no new portfolio companies added to non-accrual status during the quarter.

Q2 2026 Origination Activity

Commitments:

$114.6MM

Fundings:

$136.7MM

Net Repayments:

$55.4MM

Average Investment Size

$30.9MM

(0.9% of the portfolio at fair value)

First Lien Debt Investments (% FV)

88.3%

Floating Rate Debt Investments3

(% FV)

96.1%

Weighted Average Yield of Debt and Incoming-Producing Securities

Yield at Fair Value:

11.1%

Yield at Amortized Cost:

11.2%

1.

Includes 33 structured credit investments with a total fair value of $87.8 million as of June 30, 2026.

2.

Includes 36 structured credit investments with a total fair value of $93.8 million as of March 31, 2026.

3.

Calculation includes income earning debt investments only.

2

RESULTS OF OPERATIONS FOR THE THREE MONTHS ENDED JUNE 30, 2026

Total Investment Income

Total Investment Income

For the three months ended June 30, 2026 and 2025, investment income was $97.8 million and $115.0 million, respectively. The decrease in investment income was primarily the result of a decrease in reference rates for the three months ended June 30, 2026 compared to the same period in 2025.

$97.8MM

Net Expenses

Net Expenses

Net expenses totaled $55.7 million and $62.9 million for the three months ended June 30, 2026 and 2025, respectively. The decrease in net expenses was primarily due to a decrease in the average interest rate on our debt outstanding, which decreased from 6.3% for the three months ended June 30, 2025 to 5.6% for the three months ended June 30, 2026 due to a change in the mix of our debt financing sources and a change in SOFR rates.

$55.7MM

Debt and Capital Resources

As of June 30, 2026, the Company had $193.6 million in cash and cash equivalents (including $36.3 million of restricted cash), total principal value of debt outstanding of $1,966.0 million, and $1,086.2 million of undrawn capacity on its revolving credit facility, subject to borrowing base and other limitations. The Company’s weighted average interest rate on debt outstanding was 5.6% and 5.5% for the three-month periods ended June 30, 2026 and March 31, 2026, respectively. At June 30, 2026, the Company’s debt to equity ratio was 1.27x, compared to 1.18x at March 31, 2026. Average debt to equity was 1.24x for the three-month period ended June 30, 2026, compared to 1.14x for the three-month period ended March 31, 2026.

Total Principal Debt Outstanding

$1,966.0MM

Debt-to-Equity Ratio

Q2 2026 Quarter End:

1.27x

Q2 2026 Average1:

1.24x

1.

Daily average debt outstanding during the quarter divided by the average net assets during the quarter. Average net assets is calculated by starting with the prior quarter end net asset value and adjusting for capital activity during the quarter (adding common stock offerings / DRIP contributions).

3

LIQUIDITY AND FUNDING PROFILE

Liquidity

The following tables summarize the Company’s liquidity at June 30, 2026 and changes to unfunded commitments since March 31, 2026.

$ Millions

Revolving Credit Facility

Unfunded Commitment Activity

Revolver Capacity

$1,525

Unfunded Commitments (See Note 8 in 3/31/26 10-Q)

$512

Drawn on Revolver

($416)

Extinguished Unfunded Commitments

($12)

Unrestricted Cash Balance

$157

New Unfunded Commitments

$15

Issued Letters of Credit

($23)

Net Drawdown of Unfunded Commitments

($83)

Total Liquidity (Pre-Unfunded Commitments)

$1,243

Total Unfunded Commitments

$432

Available Unfunded Commitments1

($221)

Unavailable Unfunded Commitments1

($211)

Total Liquidity (Burdened for Unfunded Commitments)

$1,022

Available Unfunded Commitments1

$221

1.

Commitments may be subject to limitations on borrowings set forth in the agreements between the Company and the applicable portfolio company. As a result, portfolio companies may not be eligible to borrow the full commitment amount on such date.

Note: May not sum due to rounding.

Funding Profile

At June 30, 2026, the Company’s funding mix was comprised of approximately 79% unsecured and 21% secured debt. As illustrated below, the Company’s nearest debt maturity was in August 2026 at $300 million, and the weighted average remaining life of investments funded with debt was ~2.4 years, compared to a weighted average remaining maturity on debt of ~3.8 years1.

*$300 million unsecured notes with a August 1, 2026 maturity date were repaid post quarter end.

1.

Weighted by gross commitment amount

2.

The amount available may be subject to limitations related to the borrowing base under the Revolving Credit Facility, outstanding letters of credit and asset coverage requirements.

Note: Numbers may not sum due to rounding.

4

Conference Call and Webcast

Conference Call Information:

A conference call to discuss the Company’s financial results will be held at 8:30 a.m. Eastern Time on August 5, 2026. The conference call will be broadcast live in listen-only mode on the Investor Resources section of TSLX’s website at https://sixthstreetspecialtylending.gcs-web.com/events-and-presentations. The Events & Presentations page of the Investor Resources section of TSLX’s website also includes a slide presentation that complements the Earnings Conference Call. Please visit the website to test your connection before the webcast.

Research analysts who wish to participate in the conference call must first register at https://register-conf.media-server.com/register/BIb094b698d91c489080310428d3254a9e. Upon registration, all telephone participants will receive a confirmation email detailing how to join the conference call, including the dial-in number along with a unique passcode and registrant ID that can be used to access the call.

Replay Information:

A recorded version will be available under the same webcast link (https://sixthstreetspecialtylending.gcs-web.com/events-and-presentations) following the conclusion of the conference call.

5

Financial Highlights

(Amounts in millions, except per share amounts)

Three Months Ended

(unaudited)

June 30, 2026

December 31, 2025

June 30, 2025

Investments at Fair Value

$

3,302.1

$

3,347.3

$

3,294.9

Total Assets

$

3,543.2

$

3,421.7

$

3,415.8

Net Asset Value Per Share

$

16.24

$

16.98

$

17.17

Supplemental Dividend Per Share

$

0.00

$

0.01

$

0.05

Adjusted Net Asset Value Per Share (1)

$

16.24

$

16.97

$

17.12

Investment Income

$

97.8

$

108.2

$

115.0

Net Investment Income

$

40.9

$

50.4

$

50.8

Net Income (Loss)

$

40.5

$

30.0

$

59.0

Accrued Capital Gains Incentive Fee Expense

$

0.0

$

(1.8

)

$

1.4

Adjusted Net Investment Income (2)

$

40.9

$

48.6

$

52.3

Adjusted Net Income (Loss) (2)

$

40.5

$

28.2

$

60.4

Net Investment Income Per Share

$

0.43

$

0.53

$

0.54

Net Income (Loss) Per Share

$

0.43

$

0.32

$

0.63

Accrued Capital Gains Incentive Fee Expense Per Share

$

0.00

$

(0.01

)

$

0.02

Adjusted Net Investment Income Per Share (2)

$

0.43

$

0.52

$

0.56

Adjusted Net Income (Loss) Per Share (2)

$

0.43

$

0.30

$

0.64

Annualized Return on Equity (Net Investment Income) (3)

10.6

%

12.5

%

12.7

%

Annualized Return on Equity (Net Income (Loss)) (3)

10.5

%

7.4

%

14.7

%

Annualized Return on Equity (Adjusted Net Investment Income) (2)(3)

10.6

%

12.0

%

13.1

%

Annualized Return on Equity (Adjusted Net Income (Loss)) (2)(3)

10.5

%

7.0

%

15.1

%

Weighted Average Yield of Debt and Income Producing Securities at Fair Value

11.1

%

11.1

%

11.7

%

Weighted Average Yield of Debt and Income Producing Securities at Amortized Cost

11.2

%

11.3

%

12.0

%

Percentage of Debt Investment Commitments at Floating Rates

96.1

%

96.3

%

96.5

%

1.

Adjusted net asset value per share gives effect to the supplemental dividend declared related to earnings or special dividend in the applicable period.

2.

Adjusted to exclude the capital gains incentive fee that was accrued, but not paid, related to cumulative unrealized capital gains in excess of cumulative net realized capital gains less any cumulative unrealized losses and capital gains incentive fees paid inception to date.

3.

Return on equity is calculated using prior period’s ending net asset value per share.

6

Financial Statements and Tables

Sixth Street Specialty Lending, Inc.

Consolidated Balance Sheets

(Amounts in thousands, except share and per share amounts)

June 30, 2026

December 31, 2025

Assets

Investments at fair value

Non-controlled, non-affiliated investments (amortized cost of $3,181,712 and $3,244,762, respectively)

$

3,189,952

$

3,288,945

Non-controlled, affiliated investments (amortized cost of $51,391 and $0, respectively)

53,832

—

Controlled, affiliated investments (amortized cost of $83,290 and $78,520, respectively)

58,348

58,372

Total investments at fair value (amortized cost of $3,316,393 and $3,323,282, respectively)

3,302,132

3,347,317

Cash and cash equivalents (restricted cash of $40,055 and $16,727, respectively)

193,555

19,662

Interest receivable

36,955

34,132

Prepaid expenses and other assets

10,549

20,544

Total Assets

$

3,543,191

$

3,421,655

Liabilities

Debt (net of deferred financing costs of $29,024 and $24,411, respectively)

$

1,924,967

$

1,743,234

Management fees payable to affiliate

12,490

12,794

Incentive fees on net investment income payable to affiliate

8,672

10,336

Incentive fees on net capital gains accrued to affiliate

—

—

Other payables to affiliate

3,357

3,166

Other liabilities

45,151

44,404

Total Liabilities

1,994,637

1,813,934

Commitments and contingencies (Note 8)

Net Assets

Preferred stock, $0.01 par value; 100,000,000 shares authorized; no shares

issued and outstanding

—

—

Common stock, $0.01 par value; 400,000,000 shares authorized, 96,038,327

and 95,369,400 shares issued, respectively; and 95,343,139 and 94,705,150

shares outstanding, respectively

960

954

Additional paid-in capital

1,546,847

1,535,583

Treasury stock at cost; 695,188 and 664,250 shares held, respectively

(10,959

)

(10,459

)

Distributable earnings

11,706

81,643

Total Net Assets

1,548,554

1,607,721

Total Liabilities and Net Assets

$

3,543,191

$

3,421,655

Net Asset Value Per Share

$

16.24

$

16.98

7

Sixth Street Specialty Lending, Inc.

Consolidated Statements of Operations

(Amounts in thousands, except share and per share amounts)

Three Months Ended

Six Months Ended

June 30, 2026

June 30, 2025

June 30, 2026

June 30, 2025

Income

Investment income from non-controlled, non-affiliated investments:

Interest from investments

$

83,142

$

98,684

$

164,949

$

202,877

Paid-in-kind interest income

6,722

5,783

13,691

11,143

Dividend income

257

387

494

1,295

Other income

3,959

7,609

6,140

11,068

Total investment income from non-controlled, non-affiliated investments

94,080

112,463

185,274

226,383

Investment income from non-controlled, affiliated investments:

Dividend income

1,690

—

1,913

—

Total investment income from non-controlled, affiliated investments

1,690

—

1,913

—

Investment income from controlled, affiliated investments:

Interest from investments

2,069

2,549

4,040

4,977

Other income

5

3

14

4

Total investment income from controlled, affiliated investments

2,074

2,552

4,054

4,981

Total Investment Income

97,844

115,015

191,241

231,364

Expenses

Interest

30,085

33,647

58,343

66,617

Management fees

12,960

12,918

25,553

26,001

Incentive fees on net investment income

8,672

11,089

17,124

22,606

Incentive fees on net capital gains

—

1,438

—

(2,248

)

Professional fees

2,419

2,561

4,162

4,521

Directors’ fees

230

248

484

496

Other general and administrative

1,763

1,280

3,132

2,617

Total expenses

56,129

63,181

108,798

120,610

Management and incentive fees waived (Note 3)

(470

)

(297

)

(788

)

(706

)

Net Expenses

55,659

62,884

108,010

119,904

Net Investment Income Before Income Taxes

42,185

52,131

83,231

111,460

Income taxes, including excise taxes

1,301

1,291

2,505

2,642

Net Investment Income

40,884

50,840

80,726

108,818

Unrealized and Realized Gains (Losses)

Net change in unrealized gains (losses):

Non-controlled, non-affiliated investments

(3,255

)

73,790

(35,943

)

64,352

Non-controlled, affiliated investments

2,441

—

2,441

—

Controlled, affiliated investments

(2,557

)

(2,987

)

(4,793

)

(4,366

)

Translation of other assets and liabilities in foreign currencies

2,916

(25,764

)

11,316

(36,807

)

Income tax provision

(727

)

—

(727

)

—

Total net change in unrealized gains (losses)

(1,182

)

45,039

(27,706

)

23,179

Realized gains (losses):

Non-controlled, non-affiliated investments

795

(36,803

)

(38,462

)

(35,688

)

Foreign currency transactions

11

(73

)

(75

)

(352

)

Total net realized gains (losses)

806

(36,876

)

(38,537

)

(36,040

)

Total Net Unrealized and Realized Gains (Losses)

(376

)

8,163

(66,243

)

(12,861

)

Increase (Decrease) in Net Assets Resulting from Operations

$

40,508

$

59,003

$

14,483

$

95,957

Earnings per common share—basic and diluted

$

0.43

$

0.63

$

0.15

$

1.02

Weighted average shares of common stock outstanding—basic and diluted

95,021,455

93,971,164

94,866,293

93,821,251

8

The Company’s investment activity for the quarter ended June 30, 2026 and 2025 presented below (information presented herein is at par value unless otherwise indicated).

Three Months Ended

($ in millions)

June 30, 2026

June 30, 2025

New investment commitments:

Gross originations (1)

$

821.3

$

604.1

Less: Syndications/sell downs (1)

706.7

306.4

Total new investment commitments

$

114.6

$

297.7

Principal amount of investments funded:

First-lien

$

100.0

$

190.1

Second-lien

—

—

Mezzanine

—

—

Equity

—

2.3

Structured Credit

—

16.2

Joint Venture

36.7

—

Total

$

136.7

$

208.6

Principal amount of investments sold or repaid:

First-lien

$

175.2

$

365.9

Second-lien

8.2

3.4

Mezzanine

—

—

Equity

1.4

3.2

Structured Credit

7.3

16.2

Joint Venture

—

—

Total

$

192.1

$

388.7

Number of new investment commitments in

new portfolio companies

2

13

Average new investment commitment amount in

new portfolio companies

$

50.9

$

20.0

Weighted average term for new investment

commitments in new portfolio companies

(in years)

5.0

6.2

Percentage of new debt investment commitments

at floating rates

100.0

%

99.7

%

Percentage of new debt investment commitments

at fixed rates

0.0

%

0.3

%

Weighted average interest rate of new

investment commitments

10.4

%

10.7

%

Weighted average spread over reference rate of new

floating rate investment commitments

6.9

%

6.7

%

Weighted average interest rate on investments

fully sold or paid down

10.7

%

12.2

%

1.

Includes affiliates of Sixth Street.

9

About Sixth Street Specialty Lending

Sixth Street Specialty Lending is a specialty finance company focused on lending to middle-market companies. The Company seeks to generate current income primarily in U.S.-domiciled middle-market companies through direct originations of senior secured loans and, to a lesser extent, originations of mezzanine loans and investments in corporate bonds and equity securities. The Company has elected to be regulated as a business development company, or a BDC, under the Investment Company Act of 1940 and the rules and regulations promulgated thereunder. The Company is externally managed by Sixth Street Specialty Lending Advisers, LLC, an affiliate of Sixth Street and a Securities and Exchange Commission (“SEC”) registered investment adviser. The Company leverages the deep investment, sector, and operating resources of Sixth Street, a global investment firm with over $135 billion in assets under management and committed capital. For more information, visit the Company’s website at https://sixthstreetspecialtylending.com.

About Sixth Street

Sixth Street is a global investment firm with over $135 billion in assets under management and committed capital. The firm uses its long-term flexible capital, data-enabled capabilities, and One Team culture to develop themes and offer solutions to companies across all stages of growth. Founded in 2009, Sixth Street has more than 750 team members including over 300 investment professionals around the world. For more information, visit https://sixthstreet.com or follow Sixth Street on LinkedIn.

Forward-Looking Statements

Statements included herein may constitute “forward-looking statements,” within the meaning of the federal securities laws and the Private Securities Litigation Reform Act of 1995, which relate to future events or the Company’s future performance or financial condition. These forward-looking statements can be identified by the use of forward-looking terminology, such as “outlook,” “indicator,” “believes,” “expects,” “potential,” “continues,” “may,” “can,” “will,” “should,” “seeks,” “approximately,” “predicts,” “intends,” “plans,” “estimates,” “anticipates”, “confident,” “conviction,” “identified” or the negative versions of these words or other comparable words thereof. These statements are not guarantees of future performance, conditions or results and involve a number of risks and uncertainties. Actual results may differ materially from those in the forward-looking statements as a result of a number of factors, including those described from time to time in the Company’s filings with the SEC, which are accessible on the SEC’s website at www.sec.gov. Except as otherwise required by federal securities laws, the Company assumes no obligation to update any such forward-looking statements, whether as a result of new information, future developments or otherwise.

Non-GAAP Financial Measures

Adjusted net investment income and adjusted net income are each non-GAAP financial measures, which represent net investment income and net income, respectively, in each case less the impact of accrued capital gains incentive fee expenses. The Company believes that adjusted net investment income and adjusted net income provide useful information to investors regarding the fundamental earnings power of the business, and these figures are used by the Company to measure its financial condition and results of operations. The presentation of this additional information is not meant to be considered in isolation or as a substitute for financial results prepared in accordance with GAAP.

Investors:

Cami Senatore, 469-621-2033

Sixth Street Specialty Lending

IRTSLX@sixthstreet.com

Media:

Patrick Clifford, 617-793-2004

Sixth Street

PClifford@sixthstreet.com

10

GRAPHIC

GRAPHIC

Filename: img52863034_0.jpg · Sequence: 3

Binary file (39481 bytes)

Download img52863034_0.jpg

GRAPHIC

GRAPHIC

Filename: img52863034_1.jpg · Sequence: 4

Binary file (57496 bytes)

Download img52863034_1.jpg

XML — IDEA: XBRL DOCUMENT

XML

Filename: R1.htm · Sequence: 7

v3.26.1

Document and Entity Information

Aug. 04, 2026

Cover [Abstract]

Amendment Flag

false

Entity Central Index Key

0001508655

Document Type

8-K

Document Period End Date

Aug. 04, 2026

Entity Registrant Name

Sixth Street Specialty Lending, Inc.

Entity Incorporation State Country Code

DE

Entity File Number

001-36364

Entity Tax Identification Number

27-3380000

Entity Address, Address Line One

2100 McKinney Avenue

Entity Address, Address Line Two

Suite 1500

Entity Address, City or Town

Dallas

Entity Address, State or Province

TX

Entity Address, Postal Zip Code

75201

City Area Code

(469)

Local Phone Number

621-3001

Written Communications

false

Soliciting Material

false

Pre Commencement Tender Offer

false

Pre Commencement Issuer Tender Offer

false

Security 12b Title

Common Stock, par value $0.01 per share

Trading Symbol

TSLX

Security Exchange Name

NYSE

Entity Emerging Growth Company

false

X

- Definition

Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.

+ References

No definition available.

+ Details

Name:

dei_AmendmentFlag

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Area code of city

+ References

No definition available.

+ Details

Name:

dei_CityAreaCode

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Cover page.

+ References

No definition available.

+ Details

Name:

dei_CoverAbstract

Namespace Prefix:

dei_

Data Type:

xbrli:stringItemType

Balance Type:

na

Period Type:

duration

X

- Definition

For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.

+ References

No definition available.

+ Details

Name:

dei_DocumentPeriodEndDate

Namespace Prefix:

dei_

Data Type:

xbrli:dateItemType

Balance Type:

na

Period Type:

duration

X

- Definition

The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.

+ References

No definition available.

+ Details

Name:

dei_DocumentType

Namespace Prefix:

dei_

Data Type:

dei:submissionTypeItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Address Line 1 such as Attn, Building Name, Street Name

+ References

No definition available.

+ Details

Name:

dei_EntityAddressAddressLine1

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Address Line 2 such as Street or Suite number

+ References

No definition available.

+ Details

Name:

dei_EntityAddressAddressLine2

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Name of the City or Town

+ References

No definition available.

+ Details

Name:

dei_EntityAddressCityOrTown

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Code for the postal or zip code

+ References

No definition available.

+ Details

Name:

dei_EntityAddressPostalZipCode

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Name of the state or province.

+ References

No definition available.

+ Details

Name:

dei_EntityAddressStateOrProvince

Namespace Prefix:

dei_

Data Type:

dei:stateOrProvinceItemType

Balance Type:

na

Period Type:

duration

X

- Definition

A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityCentralIndexKey

Namespace Prefix:

dei_

Data Type:

dei:centralIndexKeyItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Indicate if registrant meets the emerging growth company criteria.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityEmergingGrowthCompany

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.

+ References

No definition available.

+ Details

Name:

dei_EntityFileNumber

Namespace Prefix:

dei_

Data Type:

dei:fileNumberItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Two-character EDGAR code representing the state or country of incorporation.

+ References

No definition available.

+ Details

Name:

dei_EntityIncorporationStateCountryCode

Namespace Prefix:

dei_

Data Type:

dei:edgarStateCountryItemType

Balance Type:

na

Period Type:

duration

X

- Definition

The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityRegistrantName

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

na

Period Type:

duration

X

- Definition

The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityTaxIdentificationNumber

Namespace Prefix:

dei_

Data Type:

dei:employerIdItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Local phone number for entity.

+ References

No definition available.

+ Details

Name:

dei_LocalPhoneNumber

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 13e

-Subsection 4c

+ Details

Name:

dei_PreCommencementIssuerTenderOffer

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 14d

-Subsection 2b

+ Details

Name:

dei_PreCommencementTenderOffer

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Title of a 12(b) registered security.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b

+ Details

Name:

dei_Security12bTitle

Namespace Prefix:

dei_

Data Type:

dei:securityTitleItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Name of the Exchange on which a security is registered.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection d1-1

+ Details

Name:

dei_SecurityExchangeName

Namespace Prefix:

dei_

Data Type:

dei:edgarExchangeCodeItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as soliciting material pursuant to Rule 14a-12 under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 14a

-Subsection 12

+ Details

Name:

dei_SolicitingMaterial

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Trading symbol of an instrument as listed on an exchange.

+ References

No definition available.

+ Details

Name:

dei_TradingSymbol

Namespace Prefix:

dei_

Data Type:

dei:tradingSymbolItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Securities Act

-Number 230

-Section 425

+ Details

Name:

dei_WrittenCommunications

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

na

Period Type:

duration