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

SecurityTSLX / Sixth Street Specialty Lending, Inc.
InstitutionDearborn Partners Llc
Latest Disclosed Ownership50,508 shares
Latest Disclosed Value $ 928,342
Dearborn Partners Llc reports 10.49% decrease in ownership of TSLX / Sixth Street Specialty Lending, Inc.

On May 12, 2026 - Dearborn Partners Llc filed a 13F-HR form disclosing ownership of 50,508 shares of Sixth Street Specialty Lending, Inc. (US:TSLX) valued at $928,337 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 56,429 shares of Sixth Street Specialty Lending, Inc.. This represents a change in shares of -10.49% during the quarter. The current value of the position is $878,334 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)
2026-05-12 2026-03-31 13F Sixth Street Specialty Lending COM 83012A109 50,508 -5,921 -10.49 928 -24.24 0.0486
2026-02-11 2025-12-31 13F Sixth Street Specialty Lending COM 83012A109 56,429 -2,699 -4.56 1,226 -9.33 0.0612
2025-11-10 2025-09-30 13F Sixth Street Specialty Lending COM 83012A109 59,128 -4,448 -7.00 1,352 -10.71 0.0634
2025-08-14 2025-06-30 13F Sixth Street Specialty Lending COM 83012A109 63,576 171 0.27 1,514 6.62 0.0717
2025-05-08 2025-03-31 13F Sixth Street Specialty Lending COM 83012A109 63,405 4,637 7.89 1,419 13.43 0.0681
2025-02-07 2024-12-31 13F Sixth Street Specialty Lending COM 83012A109 58,768 763 1.32 1,252 5.13 0.0524
2024-11-06 2024-09-30 13F Sixth Street Specialty Lending COM 83012A109 58,005 -27,657 -32.29 1,191 -34.90 0.0483
2024-07-26 2024-06-30 13F Sixth Street Specialty Lending COM 83012A109 85,662 -7,385 -7.94 1,829 -8.28 0.0791
2024-05-08 2024-03-31 13F Sixth Street Specialty Lending COM 83012A109 93,047 2,124 2.34 1,994 1.53 0.0856
2024-01-26 2023-12-31 13F Sixth Street Specialty Lending COM 83012A109 90,923 -796 -0.87 1,964 4.75 0.0715
2023-11-01 2023-09-30 13F Sixth Street Specialty Lending COM 83012A109 91,719 841 0.93 1,875 10.37 0.0736
2023-08-03 2023-06-30 13F Sixth Street Specialty Lending COM 83012A109 90,878 26,686 41.57 1,699 44.63 0.0650
2023-05-04 2023-03-31 13F Sixth Street Specialty Lending COM 83012A109 64,192 -330 -0.51 1,175 2.26 0.0462
2023-02-02 2022-12-31 13F Sixth Street Specialty Lending COM 83012A109 64,522 6 0.01 1,148 8.92 0.0464
2022-11-21 2022-09-30 13F/A-1 Sixth Street Specialty Lending COM 83012A109 64,516 370 0.58 1,054 -11.20 0.0465
2022-10-25 2022-09-30 13F Sixth Street Specialty Lending COM 83012A109 64,516 370 1,054 0.0435
2022-07-20 2022-06-30 13F Sixth Street Specialty Lending COM 83012A109 64,146 3,602 5.95 1,187 -15.82 0.0501
2022-05-04 2022-03-31 13F Sixth Street Specialty Lending COM 83012A109 60,544 15,443 34.24 1,410 33.65 0.0535
2022-01-28 2021-12-31 13F Sixth Street Specialty Lending COM 83012A109 45,101 -185 -0.41 1,055 4.87 0.0382
2021-10-27 2021-09-30 13F Sixth Street Specialty Lending COM 83012A109 45,286 -14 -0.03 1,006 0.10 0.0409
2021-07-26 2021-06-30 13F Sixth Street Specialty Lending COM 83012A109 45,300 899 2.02 1,005 7.60 0.0404
2021-04-29 2021-03-31 13F Sixth Street Specialty Lending COM 83012A109 44,401 826 1.90 934 3.32 0.0398
2021-01-27 2020-12-31 13F Sixth Street Specialty Lending COM 83012A109 43,575 -528 -1.20 904 19.10 0.0412
2020-10-20 2020-09-30 13F Sixth Street Specialty Lending COM 83012A109 44,103 -4,621 -9.48 759 -5.48 0.0378
2020-07-30 2020-06-30 13F Sixth Street Specialty Lending COM 83012A109 48,724 48,724 803 0.0434
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.