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Sixth Street Specialty Lending, Inc.

TSLX
Exchange
NYSE
SEC CIK
0001508655

No open-market purchases or sales by Sixth Street Specialty Lending, Inc. insiders were filed in the last 90 days; 242 institutions reported holding it in 13F filings for Q2 2026, worth $896.5M in total; no superinvestor holds it.

Q2 2025 vs. Q1 2025

How the institutions holding Sixth Street Specialty Lending, Inc. changed between Q1 2025 and Q2 2025.

All holders in Q2 2025All holders in Q1 2025

13F holders of TSLX: Q1 2025 compared with Q2 2025
MeasureQ1 2025Of which not filed for Q2 2025Q2 2025Change
Holders2361245+10
Shares47.7M26048.9M+1.17M (+2.5%)
Value$1.07B$5.82K$1.16B+$95.9M (+9.0%)

1 institution that held it in Q1 2025 haven't filed for Q2 2025 yet. Not filing isn't selling, so the changes leave them out.

New holders (31)

Institutions that held Sixth Street Specialty Lending, Inc. at the end of Q2 2025 but not at the end of Q1 2025.

Institutions new to TSLX in Q2 2025
InstitutionSharesValue% of portfolio
Bank of Montreal324,196$7.72M0.00%
Alyeska Investment Group, L.P.189,491$4.51M0.02%
Omers Administration Corp178,214$4.24M0.03%
Quantinno Capital Management LP58,035$1.38M0.01%
Jane Street Group, LLC52,974$1.26M0.00%
XTX Topco Ltd51,926$1.24M0.05%
Foundations Investment Advisors, LLC42,122$1.00M0.02%
Diversify Advisory Services, LLC32,519$787.0K0.03%
Ellsworth Advisors, LLC29,815$709.9K0.17%
DRW Securities, LLC25,122$598.2K0.04%
D. E. Shaw & Co., Inc.24,606$585.9K0.00%
Balyasny Asset Management LLC17,540$417.6K0.00%
Heritage Trust Co15,580$371.0K0.04%
Verition Fund Management LLC14,825$353.0K0.00%
Grimes & Company, Inc.12,161$289.6K0.01%
Wetherby Asset Management Inc11,514$274.1K0.01%
Concurrent Investment Advisors, LLC11,138$265.2K0.01%
Glenview Trust Co9,700$231.0K0.00%
Mercer Global Advisors Inc8,733$207.9K0.00%
Stableford Capital II LLC8,500$207.8K0.08%
Atria Wealth Solutions, Inc.8,570$204.1K0.00%
LexAurum Advisors, LLC8,454$201.3K0.03%
Nomura Asset Management Co Ltd6,588$156.9K0.00%
Global Retirement Partners, LLC2,825$67.3K0.00%
Essential Partners LLC2,200$52.4K0.02%
MTM Investment Management, LLC2,040$48.6K0.02%
Valley National Advisers Inc500$11.0K0.00%
Westside Investment Management, Inc.286$6.80K0.00%
Mid-American Wealth Advisory Group, Inc.189$4.50K0.00%
Brown Brothers Harriman & Co100$2.38K0.00%
SJS Investment Consulting Inc.43$1.02K0.00%

Sold out (21)

Institutions that held Sixth Street Specialty Lending, Inc. at the end of Q1 2025 and filed for Q2 2025 without it.

Institutions that sold out of TSLX in Q2 2025
InstitutionShares, Q1 2025Value, Q1 2025
Baillie Gifford & Co373,254$8.35M
Millennium Management LLC173,243$3.88M
Financial Advocates Investment Management140,390$3.14M
FIL Ltd78,956$1.77M
Alberta Investment Management Corp60,400$1.35M
FJ Capital Management LLC35,944$804.4K
Barclays PLC29,074$650.7K
Rathbone Brothers plc24,202$541.6K
Hamilton Capital Partners Inc.17,340$388.1K
Lansforsakringar Fondforvaltning AB (publ)16,161$361.7K
ExodusPoint Capital Management, LP15,600$349.0K
TrueMark Investments, LLC13,535$302.9K
Virtu Financial LLC9,368$210.0K
Citigroup Inc5,761$128.9K
Boston Private Wealth LLC4,787$107.1K
Simplex Trading, LLC2,258$50.0K
Ameriflex Group, Inc.1,205$27.0K
Peoples Bank500$11.2K
Quadrant Capital Group LLC426$9.53K
Cullen/Frost Bankers, Inc.285$6.38K
SOA Wealth Advisors, LLC.43$959

Not filed for Q2 2025 yet (1)

Institutions that held Sixth Street Specialty Lending, Inc. at the end of Q1 2025 and haven't filed a 13F for Q2 2025. Not filing isn't selling, so they aren't counted as sold out.

Institutions holding TSLX in Q1 2025 that haven't filed for Q2 2025
InstitutionShares, Q1 2025Value, Q1 2025
Lindbrook Capital, LLC260$5.82K