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

SecurityTSLX / Sixth Street Specialty Lending, Inc.
InstitutionProgeny 3, Inc.
Latest Disclosed Ownership2,476,398 shares
Latest Disclosed Value $ 45,516,195
Progeny 3, Inc. ownership in TSLX / Sixth Street Specialty Lending, Inc.

On May 15, 2026 - Progeny 3, Inc. filed a 13F-HR form disclosing ownership of 2,476,398 shares of Sixth Street Specialty Lending, Inc. (US:TSLX) valued at $45,516,195 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 2,476,398 shares of Sixth Street Specialty Lending, Inc.. This represents a change in shares of 0.00% during the quarter. The current value of the position is $43,757,953 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 LENDN COM 83012A109 2,476,398 0 0.00 45,516 -15.38 2.4342
2026-02-17 2025-12-31 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 2,476,398 0 0.00 53,787 -4.99 2.8951
2025-11-14 2025-09-30 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 2,476,398 0 0.00 56,610 -3.99 2.9202
2025-08-14 2025-06-30 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 2,476,398 23,451 0.96 58,963 7.41 3.3083
2025-05-15 2025-03-31 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 2,452,947 62,267 2.60 54,897 7.81 3.7784
2025-02-14 2024-12-31 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 2,390,680 137,906 6.12 50,921 10.10 4.0455
2024-11-14 2024-09-30 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 2,252,774 215,996 10.60 46,249 6.36 3.8862
2024-08-16 2024-06-30 13F/A-1 SIXTH STREET SPECIALTY LENDN COM 83012A109 2,036,778 50,908 2.56 43,485 2.18 4.1681
2024-08-14 2024-06-30 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 2,036,778 50,908 43,485 4.3128
2024-05-15 2024-03-31 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 1,985,870 0 0.00 42,557 -0.79 4.6830
2024-02-14 2023-12-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 1,985,870 88,352 4.66 42,895 10.59 5.3196
2023-11-14 2023-09-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 1,897,518 53,541 2.90 38,785 12.54 5.2898
2023-08-14 2023-06-30 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 1,843,977 132,253 7.73 34,464 10.02 5.2204
2023-05-15 2023-03-31 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 1,711,724 53,420 3.22 31,325 6.12 5.3101
2023-02-14 2022-12-31 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 1,658,304 111,601 7.22 29,518 16.79 5.1256
2022-11-14 2022-09-30 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 1,546,703 242,474 18.59 25,273 4.75 4.2206
2022-08-15 2022-06-30 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 1,304,229 197,834 17.88 24,128 -6.36 4.8618
2022-05-16 2022-03-31 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 1,106,395 256,418 30.17 25,768 29.61 4.8370
2022-02-14 2021-12-31 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 849,977 16,265 1.95 19,881 7.37 5.3768
2021-11-16 2021-09-30 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 833,712 17,455 2.14 18,517 2.23 4.6106
2021-08-16 2021-06-30 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 816,257 58,465 7.72 18,113 13.66 6.3009
2021-05-17 2021-03-31 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 757,792 18,872 2.55 15,936 3.93 6.2702
2021-02-16 2020-12-31 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 738,920 71,725 10.75 15,333 33.54 8.1051
2020-11-16 2020-09-30 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 667,195 26,920 4.20 11,482 8.75 7.4596
2020-08-14 2020-06-30 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 640,275 640,275 10,558 7.1721
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.