TSLX SEC Filing News — Sixth Street Specialty Lending, Inc.

Latest SEC filings for Sixth Street Specialty Lending, Inc. (TSLX) explained in plain English. Covers insider buying and selling (Form 4), proposed insider sales (Form 144), material company events (8-K), and quarterly & annual reports (10-Q / 10-K). StrongBuyAnalytics provides navigation and brief excerpts or summaries; original filings remain at the SEC/source links and were authored by their filers, not StrongBuyAnalytics. Filing dates shown are source dates. Coverage and detection can be delayed or incomplete because of SEC availability, amendments, parsing, caching, or outages. Latest source filing date shown: 2026-08-04.

Sixth Street Specialty Lending, Inc. (NYSE: TSLX) is a business development company. The fund provides senior secured loans (first-lien, second-lien, and unitranche), unsecured loans, mezzanine debt, and investments in corporate bonds and equity securities and structured products, non-control structured equity, and common equity with a focus on co-investments for organic growth, acquisitions, market or product expansion, restructuring initiatives, recapitalizations, growth capital, buyout, and r…
Sector: Financial Services Industry: Asset Management Market Cap: $1.6B CIK: 1508655
20
Total Filings
9
Bullish Classifications
0
Bearish Classifications
10
Insider Transactions
7
Material Events (8-K)
3
Periodic Reports
Rule-based classifications for TSLX currently lean bullish. Of the 20 displayed SEC filing records, 9 carry bullish classifications versus 0 bearish classifications. These labels summarize filing attributes; they are not recommendations, probabilities, or evidence of future price direction. There were 10 insider transactions (Form 4) in this period.
TSLX Filing Activity Snapshot 2025-11-20 — 2026-08-04
Insider Transactions (Form 4)
9 buys vs 0 sells
Net insider buying in this period — more purchases than sales reported.
Largest Form 144 Filing
$5.53M
Waxman Alan (Vice President) · 2026-03-09
300,000 shares · Form 4
Insider Transactions 10 · Forms 3, 4 and 5

A Form 4 is filed within two business days of a company insider — an officer, a director, or a holder of more than ten percent of the stock — changing their position in the shares. All 10 filings in this group are Form 4s for Sixth Street Specialty Lending, Inc.

The difficulty with reading these filings as a group is that a single form type covers transactions that mean entirely different things. An executive spending their own money to buy stock and an executive having shares withheld to pay tax on a vesting grant both appear as a Form 4. Every filing below is therefore tagged with the nature of the underlying transaction, taken from the transaction code reported on the form itself.

Across the 10 insider filings shown, the breakdown is 9 open-market purchase and 1 other reported transaction. 9 of them involved a discretionary open-market trade; the rest are compensation and administrative mechanics.

What each transaction type means

Open-market purchase ×9
The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.
Other reported transaction ×1
The filing reports a transaction type that does not map to a routine purchase, sale, award or withholding.
Form 4 Other reported transaction Tax / Compensation Filing 2026-05-29

TSLX insider Form 4 filed for equity award, exercise, or tax withholding

Stanley Robert J. (Director, CEO) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

The filing reports a transaction type that does not map to a routine purchase, sale, award or withholding.

Transactions reported on this filing
Code Nature Shares Price Value
J Other transaction 20,000 — —
Filing: Form 4 (Insider Transaction) Insider: Stanley Robert J. (Director, CEO) Shares: 20,000
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market purchase Insider Buying 2026-05-13

TSLX insider Bruck Ross Anthony (Vice President) bought 8,000 shares (~$142.1K)

Bruck Ross Anthony, listed as Vice President at Sixth Street Specialty Lending, Inc., reported an open-market purchase of 8,000 TSLX shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.

The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Transactions reported on this filing
Code Nature Shares Price Value
P Open-market purchase 8,000 $17.76 $142.1K
Filing: Form 4 (Insider Transaction) Insider: Bruck Ross Anthony (Vice President) Shares: 8,000 Est. Value: $142.1K
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market purchase Insider Buying 2026-03-11

TSLX insider Waxman Alan (Vice President) bought 245,000 shares (~$4.47M)

Waxman Alan, listed as Vice President at Sixth Street Specialty Lending, Inc., reported an open-market purchase of 245,000 TSLX shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.

The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Transactions reported on this filing
Code Nature Shares Price Value
P Open-market purchase 200,000 $18.18 $3.64M
P Open-market purchase 45,000 $18.47 $831.1K
Filing: Form 4 (Insider Transaction) Insider: Waxman Alan (Vice President) Shares: 245,000 Est. Value: $4.47M
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market purchase Insider Buying 2026-03-10

TSLX insider Covington P Emery (Director) bought 7,500 shares (~$137.6K)

Covington P Emery, listed as Director at Sixth Street Specialty Lending, Inc., reported an open-market purchase of 7,500 TSLX shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.

The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Transactions reported on this filing
Code Nature Shares Price Value
P Open-market purchase 7,500 $18.35 $137.6K
Filing: Form 4 (Insider Transaction) Insider: Covington P Emery (Director) Shares: 7,500 Est. Value: $137.6K
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market purchase Insider Buying 2026-03-09

TSLX insider Waxman Alan (Vice President) bought 300,000 shares (~$5.53M)

Waxman Alan, listed as Vice President at Sixth Street Specialty Lending, Inc., reported an open-market purchase of 300,000 TSLX shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.

The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Transactions reported on this filing
Code Nature Shares Price Value
P Open-market purchase 100,000 $18.46 $1.85M
P Open-market purchase 200,000 $18.42 $3.68M
Filing: Form 4 (Insider Transaction) Insider: Waxman Alan (Vice President) Shares: 300,000 Est. Value: $5.53M
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market purchase Insider Buying 2026-03-04

TSLX insider Stiepleman David (Director, Vice President) bought 20,200 shares (~$356.5K)

Stiepleman David, listed as Director, Vice President at Sixth Street Specialty Lending, Inc., reported an open-market purchase of 20,200 TSLX shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.

The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Transactions reported on this filing
Code Nature Shares Price Value
P Open-market purchase 20,200 $17.65 $356.5K
Filing: Form 4 (Insider Transaction) Insider: Stiepleman David (Director, Vice President) Shares: 20,200 Est. Value: $356.5K
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market purchase Insider Buying 2026-03-03

TSLX insider Peck Joshua (Vice President) bought 2,840 shares (~$50.0K)

Peck Joshua, listed as Vice President at Sixth Street Specialty Lending, Inc., reported an open-market purchase of 2,840 TSLX shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.

The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Transactions reported on this filing
Code Nature Shares Price Value
P Open-market purchase 2,840 $17.59 $50.0K
Filing: Form 4 (Insider Transaction) Insider: Peck Joshua (Vice President) Shares: 2,840 Est. Value: $50.0K
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market purchase Insider Buying 2026-03-03

TSLX insider Pluss Steven (Vice President) bought 15,000 shares (~$265.8K)

Pluss Steven, listed as Vice President at Sixth Street Specialty Lending, Inc., reported an open-market purchase of 15,000 TSLX shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.

The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Transactions reported on this filing
Code Nature Shares Price Value
P Open-market purchase 15,000 $17.72 $265.8K
Filing: Form 4 (Insider Transaction) Insider: Pluss Steven (Vice President) Shares: 15,000 Est. Value: $265.8K
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market purchase Insider Buying 2026-03-02

TSLX insider Graf Michael (See Remarks) bought 1,000 shares (~$18.3K)

Graf Michael, listed as See Remarks at Sixth Street Specialty Lending, Inc., reported an open-market purchase of 1,000 TSLX shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.

The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Transactions reported on this filing
Code Nature Shares Price Value
P Open-market purchase 1,000 $18.26 $18.3K
Filing: Form 4 (Insider Transaction) Insider: Graf Michael (See Remarks) Shares: 1,000 Est. Value: $18.3K
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market purchase Insider Buying 2025-11-20

TSLX insider Stanley Robert J. (Director, Co-CEO) bought 10,000 shares (~$208.5K)

Stanley Robert J., listed as Director, Co-CEO at Sixth Street Specialty Lending, Inc., reported an open-market purchase of 10,000 TSLX shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.

The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Transactions reported on this filing
Code Nature Shares Price Value
P Open-market purchase 10,000 $20.85 $208.5K
Filing: Form 4 (Insider Transaction) Insider: Stanley Robert J. (Director, Co-CEO) Shares: 10,000 Est. Value: $208.5K
View on SEC EDGAR → Open Filing Document →
Material Events 7 · Form 8-K

An 8-K reports a material event in the window between scheduled reports. There are 7 in this period for Sixth Street Specialty Lending, Inc. Each 8-K names the item number it is filed under, and that number is the fastest way to tell a routine disclosure from a consequential one.

Item 2.02 is an earnings release, Item 5.02 is a change of directors or officers, and Item 1.01 or 2.01 covers a material agreement or a completed acquisition. Item 7.01 and Item 8.01 are the general-purpose disclosure items and carry no fixed meaning on their own.

Form 8-K Material Company Update 2026-08-04

TSLX filed 8-K — material company event

Sixth Street Specialty Lending, Inc. filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)
View on SEC EDGAR → Open Filing Document →
Form 8-K Material Company Update 2026-06-18

TSLX filed 8-K — material company event

Sixth Street Specialty Lending, Inc. filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)
View on SEC EDGAR → Open Filing Document →
Form 8-K Material Company Update 2026-05-22

TSLX filed 8-K — material company event

Sixth Street Specialty Lending, Inc. filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)
View on SEC EDGAR → Open Filing Document →
Form 8-K Material Company Update 2026-05-14

TSLX filed 8-K — material company event

Sixth Street Specialty Lending, Inc. filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)
View on SEC EDGAR → Open Filing Document →
Form 8-K Material Company Update 2026-05-05

TSLX filed 8-K — material company event

Sixth Street Specialty Lending, Inc. filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)
View on SEC EDGAR → Open Filing Document →
Form 8-K Material Company Update 2026-02-23

TSLX filed 8-K — material company event

Sixth Street Specialty Lending, Inc. filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)
View on SEC EDGAR → Open Filing Document →
Form 8-K Material Company Update 2026-02-12

TSLX filed 8-K — material company event

Sixth Street Specialty Lending, Inc. filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)
View on SEC EDGAR → Open Filing Document →
Periodic Reports 3 · Forms 10-K and 10-Q

The periodic reports are where the audited and reviewed financial statements live. This period contains 1 annual report (10-K) and 2 quarterly reports (10-Q) for Sixth Street Specialty Lending, Inc.

The two are not equivalent in weight. A 10-K is audited by an external firm and includes the full risk factor disclosure, business description and management discussion; a 10-Q is unaudited, reviewed rather than examined, and much shorter. When a figure in a quarterly report is later revised, the annual report is usually where the correction appears.

An amended report — 10-K/A or 10-Q/A — restates or corrects something in the original filing, and is worth reading against the version it replaces.

Form 10-Q Quarterly Report 2026-08-04

TSLX filed Quarterly Report (10-Q)

Sixth Street Specialty Lending, Inc. filed its quarterly report with the SEC. This report includes unaudited financial statements and management discussion for the quarter.

Filing: 10-Q (Quarterly Report)
View on SEC EDGAR → Open Filing Document →
Form 10-Q Quarterly Report 2026-05-05

TSLX filed Quarterly Report (10-Q)

Sixth Street Specialty Lending, Inc. filed its quarterly report with the SEC. This report includes unaudited financial statements and management discussion for the quarter.

Filing: 10-Q (Quarterly Report)
View on SEC EDGAR → Open Filing Document →
Form 10-K Annual Report 2026-02-12

TSLX filed Annual Report (10-K)

Sixth Street Specialty Lending, Inc. filed its annual report with the SEC. This report includes audited financial statements, business overview, risk factors, and management discussion.

Filing: 10-K (Annual Report)
View on SEC EDGAR → Open Filing Document →

How we classify Sixth Street Specialty Lending, Inc.'s filings

Straight from EDGAR

Each displayed record links to an original source document. StrongBuyAnalytics provides navigation and brief excerpts or summaries, not the filing itself. Parsing may omit context or contain errors, so read the original document in full.

Transaction codes, not guesswork

The nature shown on each insider filing comes from the transaction code the filer entered on the form itself — P for an open-market purchase, A for a compensation award, F for shares withheld to pay tax, M for an option exercise. Where one filing contains several codes, the transaction table lists them line by line.

Why the distinction matters

Insider activity is routinely summarised as buying or selling, which flattens together decisions that mean very different things. Shares withheld for tax on a vesting grant are an automatic administrative step; shares bought on the open market are someone committing their own money at the current price.

What this page does not tell you

A filing records what happened, not why. Form 4 does not always disclose whether a sale was executed under a pre-arranged Rule 10b5-1 plan, and no single filing is a basis for a decision on TSLX. Read these alongside the fundamentals rather than in isolation.

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Publisher, sources & limitations — September 15, 2026. StrongBuyAnalytics provides navigation and brief excerpts or summaries for educational use. Original filings remain at SEC EDGAR or other displayed source links; StrongBuyAnalytics does not author them. Filing dates are source dates, not publication dates for this page. Coverage can be delayed, incomplete, amended, or unavailable because of SEC/source availability, parsing, caching, or outages. Verify every material statement in the original filing.
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