Sixth Street Specialty Lending, Inc.
US ˙ NYSE ˙ US83012A1097

SecurityTSLX / Sixth Street Specialty Lending, Inc.
InstitutionClayton Partners LLC
Latest Disclosed Ownership159,556 shares
Latest Disclosed Value $ 2,932,639
Clayton Partners LLC reports 10.42% decrease in ownership of TSLX / Sixth Street Specialty Lending, Inc.

On May 15, 2026 - Clayton Partners LLC filed a 13F-HR form disclosing ownership of 159,556 shares of Sixth Street Specialty Lending, Inc. (US:TSLX) valued at $2,932,639 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 178,121 shares of Sixth Street Specialty Lending, Inc.. This represents a change in shares of -10.42% during the quarter. The current value of the position is $2,774,679 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 159,556 -18,565 -10.42 2,933 -24.20 2.1321
2026-02-17 2025-12-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 178,121 40,999 29.90 3,869 23.42 2.7941
2025-11-10 2025-09-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 137,122 -18 -0.01 3,135 -4.01 2.3772
2025-08-14 2025-06-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 137,140 -14,591 -9.62 3,265 -3.83 2.7436
2025-05-15 2025-03-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 151,731 -20,741 -12.03 3,396 -7.57 2.9533
2025-02-10 2024-12-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 172,472 -1,011 -0.58 3,674 3.15 2.5412
2024-11-13 2024-09-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 173,483 31,914 22.54 3,562 17.84 2.5659
2024-08-13 2024-06-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 141,569 -1,834 -1.28 3,022 -1.66 2.4310
2024-05-14 2024-03-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 143,403 146 0.10 3,073 -0.68 2.6104
2024-02-14 2023-12-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 143,257 -163 -0.11 3,094 5.56 2.5055
2023-11-15 2023-09-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 143,420 3,076 2.19 2,932 11.74 2.4915
2023-08-14 2023-06-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 140,344 -996 -0.70 2,623 1.43 2.2665
2023-05-15 2023-03-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 141,340 991 0.71 2,587 3.52 2.5178
2023-02-14 2022-12-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 140,349 -28,354 -16.81 2,498 -9.39 2.3640
2022-11-10 2022-09-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 168,703 45,074 36.46 2,757 20.55 3.1087
2022-08-15 2022-06-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 123,629 -104 -0.08 2,287 -20.65 2.4668
2022-05-12 2022-03-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 123,733 164 0.13 2,882 -0.28 2.4295
2022-02-07 2021-12-31 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 123,569 2,149 1.77 2,890 7.16 2.5183
2021-11-16 2021-09-30 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 121,420 -42 -0.03 2,697 0.07 2.5797
2021-08-13 2021-06-30 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 121,462 4,427 3.78 2,695 9.51 2.2654
2021-05-13 2021-03-31 13F/A-1 SIXTH STREET SPECIALTY LENDN COM 83012A109 117,035 117,035 2,461 2.3775
2021-05-12 2021-03-31 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 117,035 117,035 2,461 2.3827
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.