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

SecurityTSLX / Sixth Street Specialty Lending, Inc.
InstitutionCitadel Advisors Llc
ManagerKen Griffin
Latest Disclosed Ownership21,793 shares
Latest Disclosed Value $ 400,555
Citadel Advisors Llc ownership in TSLX / Sixth Street Specialty Lending, Inc.

On May 15, 2026 - Citadel Advisors Llc filed a 13F-HR form disclosing ownership of 21,793 shares of Sixth Street Specialty Lending, Inc. (US:TSLX) valued at $400,555 USD as of March 31, 2026. The entity filed a previous 13F-HR on November 14, 2025 disclosing 0 shares of Sixth Street Specialty Lending, Inc.. The current value of the position is $378,980 USD.

Citadel Advisors Llc has a history of taking positions in derivatives of the underlying security (TSLX) in the form of stock options. The firm currently holds call options representing 12,400 of underlying shares valued at $227,912 USD and put options representing 57,300 of underlying shares valued at $1,053,174 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

TSLX / Sixth Street Specialty Lending, Inc. Historical Put/Call Ratio
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 21,793 21,793 401 0.0001
2025-11-14 2025-09-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 0 -74,279 -100.00 0 -100.00
2025-08-14 2025-06-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 74,279 47,389 176.23 1,769 194.18 0.0003
2025-05-15 2025-03-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 26,890 12,865 91.73 602 101.68 0.0001
2025-02-14 2024-12-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 14,025 -273,694 -95.13 299 -94.95 0.0001
2024-11-14 2024-09-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 287,719 146,055 103.10 5,907 95.30 0.0011
2024-08-14 2024-06-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 141,664 118,643 515.37 3,025 513.39 0.0006
2024-05-15 2024-03-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 23,021 9,461 69.77 493 68.84 0.0001
2024-02-14 2023-12-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 13,560 -26,880 -66.47 293 -64.65 0.0001
2023-11-14 2023-09-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 40,440 20,814 106.05 827 125.68 0.0002
2023-08-14 2023-06-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 19,626 -51,639 -72.46 367 -71.93 0.0001
2023-05-15 2023-03-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 71,265 -285,597 -80.03 1,304 -79.47 0.0003
2023-02-14 2022-12-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 356,862 10,578 3.05 6,352 12.27 0.0015
2022-11-14 2022-09-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 346,284 41,153 13.49 5,658 0.23 0.0013
2022-08-15 2022-06-30 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 305,131 149,389 95.92 5,645 55.60 0.0014
2022-05-16 2022-03-31 13F SIXTH STREET SPECIALTY LENDI COM 83012A109 155,742 -208,799 -57.28 3,628 -57.45 0.0007
2022-02-14 2021-12-31 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 364,541 287,758 374.77 8,526 400.06 0.0017
2021-11-15 2021-09-30 13F SIXTH STREET SPECIALTY LENDN Cmn 83012A109 76,783 -308,640 -80.08 1,705 -80.07 0.0004
2021-08-16 2021-06-30 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 385,423 -376,778 -49.43 8,553 -46.64 0.0019
2021-05-21 2021-03-31 13F/A-1 SIXTH STREET SPECIALTY LENDN COM 83012A109 762,201 629,971 476.42 16,029 484.15 0.0039
2021-05-17 2021-03-31 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 762,201 629,971 16,029 0.0039
2021-02-16 2020-12-31 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 132,230 -75,250 -36.27 2,744 -23.14 0.0007
2020-11-16 2020-09-30 13F SIXTH STREET SPECIALTY LENDN COM 83012A109 207,480 -21,857 -9.53 3,570 -5.61 0.0010
2020-08-14 2020-06-30 13F SIXTH STREET SPECIALTY LENDN Cmn 83012A109 229,337 229,337 3,782 0.0013
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-05-15 2026-03-31 13F SIXTH STREET SPECIALTY LENDI COM Call 12,400 -57.82 228 -64.42 n/a n/a n/a
2026-02-17 2025-12-31 13F SIXTH STREET SPECIALTY LENDI COM Call 29,400 -24.62 639 -28.40 n/a n/a n/a
2025-11-14 2025-09-30 13F SIXTH STREET SPECIALTY LENDI COM Call 39,000 -16.84 892 -20.16 n/a n/a n/a
2025-08-14 2025-06-30 13F SIXTH STREET SPECIALTY LENDI COM Call 46,900 838.00 1,117 905.41 n/a n/a n/a
2025-05-15 2025-03-31 13F SIXTH STREET SPECIALTY LENDI COM Call 5,000 -35.90 112 -33.13 n/a n/a n/a
2025-02-14 2024-12-31 13F SIXTH STREET SPECIALTY LENDI COM Call 7,800 100.00 166 107.50 n/a n/a n/a
2024-11-14 2024-09-30 13F SIXTH STREET SPECIALTY LENDI COM Call 3,900 -87.81 80 -88.29 n/a n/a n/a
2024-08-14 2024-06-30 13F SIXTH STREET SPECIALTY LENDI COM Call 32,000 44.80 683 44.40 n/a n/a n/a
2024-05-15 2024-03-31 13F SIXTH STREET SPECIALTY LENDI COM Call 22,100 93.86 474 92.28 n/a n/a n/a
2024-02-14 2023-12-31 13F SIXTH STREET SPECIALTY LENDI COM Call 11,400 -69.76 246 -68.05 n/a n/a n/a
2023-11-14 2023-09-30 13F SIXTH STREET SPECIALTY LENDI COM Call 37,700 -57.55 771 -53.59 n/a n/a n/a
2023-08-14 2023-06-30 13F SIXTH STREET SPECIALTY LENDI COM Call 88,800 -3.27 1,660 -1.19 n/a n/a n/a
2023-05-15 2023-03-31 13F SIXTH STREET SPECIALTY LENDI COM Call 91,800 97.42 1,680 103.02 n/a n/a n/a
2023-02-14 2022-12-31 13F SIXTH STREET SPECIALTY LENDI COM Call 46,500 -36.13 828 -30.50 n/a n/a n/a
2022-11-14 2022-09-30 13F SIXTH STREET SPECIALTY LENDI COM Call 72,800 -4.71 1,190 -15.78 n/a n/a n/a
2022-08-15 2022-06-30 13F SIXTH STREET SPECIALTY LENDI COM Call 76,400 71.69 1,413 36.39 n/a n/a n/a
2022-05-16 2022-03-31 13F SIXTH STREET SPECIALTY LENDI COM Call 44,500 79.44 1,036 78.62 n/a n/a n/a
2022-02-14 2021-12-31 13F SIXTH STREET SPECIALTY LENDN COM Call 24,800 -49.08 580 -46.40 n/a n/a n/a
2021-11-15 2021-09-30 13F SIXTH STREET SPECIALTY LENDN Cmn Call 48,700 295.93 1,082 296.34 n/a n/a n/a
2021-08-16 2021-06-30 13F SIXTH STREET SPECIALTY LENDN COM Call 12,300 19.42 273 25.81 n/a n/a n/a
2021-05-21 2021-03-31 13F/A SIXTH STREET SPECIALTY LENDN COM Call 10,300 217 n/a n/a n/a
2021-05-17 2021-03-31 13F SIXTH STREET SPECIALTY LENDN COM Call 10,300 217 n/a n/a n/a
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-05-15 2026-03-31 13F SIXTH STREET SPECIALTY LENDI COM Put 57,300 267.31 1,053 211.54 n/a n/a n/a
2026-02-17 2025-12-31 13F SIXTH STREET SPECIALTY LENDI COM Put 15,600 5.41 339 0.00 n/a n/a n/a
2025-11-14 2025-09-30 13F SIXTH STREET SPECIALTY LENDI COM Put 14,800 -14.45 338 -17.76 n/a n/a n/a
2025-08-14 2025-06-30 13F SIXTH STREET SPECIALTY LENDI COM Put 17,300 -24.78 412 -20.04 n/a n/a n/a
2025-05-15 2025-03-31 13F SIXTH STREET SPECIALTY LENDI COM Put 23,000 447.62 515 477.53 n/a n/a n/a
2025-02-14 2024-12-31 13F SIXTH STREET SPECIALTY LENDI COM Put 4,200 -77.66 89 -76.88 n/a n/a n/a
2024-11-14 2024-09-30 13F SIXTH STREET SPECIALTY LENDI COM Put 18,800 -58.77 386 -60.43 n/a n/a n/a
2024-08-14 2024-06-30 13F SIXTH STREET SPECIALTY LENDI COM Put 45,600 7.55 974 7.16 n/a n/a n/a
2024-05-15 2024-03-31 13F SIXTH STREET SPECIALTY LENDI COM Put 42,400 765.31 909 764.76 n/a n/a n/a
2024-02-14 2023-12-31 13F SIXTH STREET SPECIALTY LENDI COM Put 4,900 88.46 106 98.11 n/a n/a n/a
2023-11-14 2023-09-30 13F SIXTH STREET SPECIALTY LENDI COM Put 2,600 0.00 53 10.42 n/a n/a n/a
2023-08-14 2023-06-30 13F SIXTH STREET SPECIALTY LENDI COM Put 2,600 -65.33 49 -64.96 n/a n/a n/a
2023-05-15 2023-03-31 13F SIXTH STREET SPECIALTY LENDI COM Put 7,500 44.23 137 48.91 n/a n/a n/a
2023-02-14 2022-12-31 13F SIXTH STREET SPECIALTY LENDI COM Put 5,200 -61.48 93 -58.37 n/a n/a n/a
2022-11-14 2022-09-30 13F SIXTH STREET SPECIALTY LENDI COM Put 13,500 -4.93 221 -15.97 n/a n/a n/a
2022-08-15 2022-06-30 13F SIXTH STREET SPECIALTY LENDI COM Put 14,200 263 n/a n/a n/a
2022-05-16 2022-03-31 13F SIXTH STREET SPECIALTY LENDN COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2022-02-14 2021-12-31 13F SIXTH STREET SPECIALTY LENDN COM Put 9,400 -42.33 220 -39.23 n/a n/a n/a
2021-11-15 2021-09-30 13F SIXTH STREET SPECIALTY LENDN Cmn Put 16,300 36.97 362 37.12 n/a n/a n/a
2021-08-16 2021-06-30 13F SIXTH STREET SPECIALTY LENDN COM Put 11,900 264 n/a n/a n/a
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.