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

SecurityTSLX / Sixth Street Specialty Lending, Inc.
InstitutionNorthern Trust Corp
Latest Disclosed Ownership37,059 shares
Latest Disclosed Value $ 681,144
Northern Trust Corp reports 50.64% decrease in ownership of TSLX / Sixth Street Specialty Lending, Inc.

On May 14, 2026 - Northern Trust Corp filed a 13F-HR form disclosing ownership of 37,059 shares of Sixth Street Specialty Lending, Inc. (US:TSLX) valued at $681,144 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 75,085 shares of Sixth Street Specialty Lending, Inc.. This represents a change in shares of -50.64% during the quarter. The current value of the position is $644,456 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)
2026-05-14 2026-03-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 37,059 -38,026 -50.64 681 -58.22 0.0000
2026-02-17 2025-12-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 75,085 -3,584 -4.56 1,631 -9.34 0.0000
2025-11-14 2025-09-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 78,669 -5,623 -6.67 1,798 -10.37 0.0001
2025-08-13 2025-06-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 84,292 28,972 52.37 2,007 62.04 0.0003
2025-05-13 2025-03-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 55,320 -2,330 -4.04 1,238 0.90 0.0002
2025-02-14 2024-12-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 57,650 8,526 17.36 1,228 21.73 0.0002
2024-11-13 2024-09-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 49,124 12,488 34.09 1,009 28.90 0.0002
2024-08-14 2024-06-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 36,636 7,400 25.31 782 24.92 0.0001
2024-05-14 2024-03-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 29,236 1,627 5.89 627 5.03 0.0001
2024-02-13 2023-12-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 27,609 -29,645 -51.78 596 -49.06 0.0001
2023-11-13 2023-09-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 57,254 3,371 6.26 1,170 16.19 0.0002
2023-08-11 2023-06-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 53,883 6,853 14.57 1,007 17.09 0.0002
2023-05-15 2023-03-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 47,030 -559 -1.17 861 1.53 0.0002
2023-02-13 2022-12-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 47,589 -2,347 -4.70 847 3.67 0.0002
2022-11-14 2022-09-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 49,936 6,326 14.51 817 1.24 0.0002
2022-08-12 2022-06-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 43,610 2,803 6.87 807 -15.05 0.0002
2022-05-13 2022-03-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 40,807 13,248 48.07 950 47.52 0.0002
2022-02-08 2021-12-31 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 27,559 -1,906 -6.47 644 -1.53 0.0001
2021-11-15 2021-09-30 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 29,465 1,206 4.27 654 4.31 0.0001
2021-08-13 2021-06-30 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 28,259 10,633 60.33 627 69.46 0.0001
2021-05-12 2021-03-31 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 17,626 -8,459 -32.43 370 -31.61 0.0001
2021-02-11 2020-12-31 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 26,085 -6,749 -20.55 541 -4.25 0.0001
2020-11-16 2020-09-30 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 32,834 -1,080 -3.18 565 1.07 0.0001
2020-08-14 2020-06-30 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 33,914 33,914 559 0.0001
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.