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

SecurityTSLX / Sixth Street Specialty Lending, Inc.
InstitutionAdvisor Group Holdings, Inc.
Latest Disclosed Ownership44,602 shares
Latest Disclosed Value $ 820,145
Advisor Group Holdings, Inc. reports 17.97% decrease in ownership of TSLX / Sixth Street Specialty Lending, Inc.

On May 15, 2026 - Advisor Group Holdings, Inc. filed a 13F-HR form disclosing ownership of 44,602 shares of Sixth Street Specialty Lending, Inc. (US:TSLX) valued at $819,785 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 54,374 shares of Sixth Street Specialty Lending, Inc.. This represents a change in shares of -17.97% during the quarter. The current value of the position is $770,277 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 44,602 -9,772 -17.97 820 -30.57 0.0007
2026-02-17 2025-12-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 54,374 12,642 30.29 1,181 19.90 0.0017
2025-11-14 2025-09-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 41,732 1,393 3.45 986 2.60 0.0014
2025-09-04 2025-06-30 13F/A-1 SIXTH STREET SPECIALTY LENDI COM 83012A109 40,339 -2,086 -4.92 961 1.16 0.0017
2025-08-13 2025-06-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 26,980 -15,445 582 0.0007
2025-05-12 2025-03-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 42,425 13,277 45.55 950 53.06 0.0021
2025-06-06 2024-12-31 13F/A-1 SIXTH STREET SPECIALTY LENDI COM 83012A109 29,148 -13,172 -31.12 621 -28.57 0.0014
2025-02-07 2024-12-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 15,290 -27,030 318 0.0008
2024-11-13 2024-09-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 42,320 -552 -1.29 869 -5.14 0.0020
2024-08-13 2024-06-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 42,872 -26,146 -37.88 915 -38.09 0.0022
2024-05-10 2024-03-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 69,018 -1,652 -2.34 1,479 -3.15 0.0033
2024-02-12 2023-12-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 70,670 26,591 60.33 1,526 69.56 0.0027
2023-11-13 2023-09-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 44,079 -7,926 -15.24 901 -7.69 0.0013
2023-08-21 2023-06-30 13F/A-1 SIXTH STREET SPECIALTY LENDI COM 83012A109 52,005 -28,268 -35.21 975 -33.04 0.0018
2023-08-10 2023-06-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 52,005 -28,268 975 0.0003
2023-05-12 2023-03-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 80,273 7,601 10.46 1,457 12.61 0.0027
2023-02-10 2022-12-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 72,672 15,894 27.99 1,294 39.33 0.0026
2022-11-14 2022-09-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 56,778 6,129 12.10 928 -1.80 0.0021
2022-08-10 2022-06-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 50,649 11,594 29.69 945 59.63 0.0021
2022-05-04 2022-03-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 39,055 1,765 4.73 592 -32.19 0.0011
2022-02-03 2021-12-31 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 37,290 539 1.47 873 6.72 0.0017
2021-11-05 2021-09-30 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 36,751 -2,940 -7.41 818 -7.26 0.0017
2021-08-02 2021-06-30 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 39,691 2,535 6.82 882 13.08 0.0019
2021-05-13 2021-03-31 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 37,156 3,265 9.63 780 10.80 0.0019
2021-02-10 2020-12-31 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 33,891 4,037 13.52 704 36.96 0.0019
2020-11-12 2020-09-30 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 29,854 -4,170 -12.26 514 -8.21 0.0015
2020-08-14 2020-06-30 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 34,024 34,024 560 0.0019
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.