Sixth Street Specialty Lending TSLX Insider Ownership

NYSE TSLX

$17.00 +0.17 (+1.01%)

As of: Oct 21, 2026 · 3:59 PM EDT

Insider Holdings by Owner

735.70K Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

0.745%

▼-0.020% pp QoQ

Shares Held by Insiders

710.74K

filed for Sep 2026

▼-2.57% QoQ

Shares Outstanding

95.34Mn

95,343,139 shares

Direct Holdings

141.83K

Indirect: 568.91K

Net Shares Traded (QoQ)

-18.73K

net selling in Sep 2026

Insiders Holding Shares

with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold

Latest quarter —

Net over range —

Buying quarters —

Insider Ownership Summary

Updated Oct 10, 2026

In the last 12 months, insiders at Sixth Street Specialty Lending made open-market purchases of $11.18 million (609.54K shares) and sold no shares on the open market.

A count shows 8 insiders buying TSLX stock on the open market over the past 12 months and none selling.
Among TSLX's insiders, Alan Waxman (Vice President) was the top open-market buyer in the past 12 months, with $10 million of stock purchased (545K shares) and the latest purchase on March 10, 2026.
The latest open-market trade in TSLX stock by an insider was a purchase of 8K shares for $142,080 by Ross Anthony Bruck (Vice President) on May 11, 2026.
Per Business Quant, TSLX insiders together hold 710.74K shares based on their latest Form 4 filings, down 2.57% from 729.46K shares at the end of Q2 2026 and up 940.14% from 68.33K shares at the end of Q3 2025.
Of the 710.74K shares held by Sixth Street Specialty Lending insiders, 141.83K shares (19.96%) are held directly and 568.91K shares (80.04%) indirectly, through trusts, partnerships, family members and other entities.
TSLX's insider total is spread across 8 insiders who have filed a Form 4 in the past two years.
TSLX's three largest insider shareholders, per their latest Form 4 filings, are Alan Waxman (Vice President, 545K shares), Steven Pluss (Vice President, 51.5K shares) and Robert J. Stanley (CEO, 44.91K shares).
Alan Waxman alone accounts for 76.68% of the shares held by Sixth Street Specialty Lending insiders.
Institutions owned 51.89% of TSLX shares as of Q2 2026; insiders' latest Form 4 filings account for about 0.75%, leaving roughly 47.36% with other investors, including the public.
In the last 12 months, 10 Form 4 filings with transactions in TSLX stock came from 8 insiders.
The insider data for TSLX reflects Form 4 filings through May 29, 2026.

Form 4 Holdings

Insiders Holding TSLX

Insiders 14

Shares held 735.70K

Of outstanding 0.772%

#	Insider	Position	Direct	Indirect	Total	Share of Insiders	Last Filed
1	Alan Waxman	Vice President	0	545,000	545,000	74.1%	11 Mar, 2026
2	Steven Pluss	Vice President	51,500	0	51,500	7.0%	03 Mar, 2026
3	David Stiepleman	Vice President	25,735	0	25,735	3.5%	04 Mar, 2026
4	Robert J. Stanley	Ceo	0	23,907	23,907	3.2%	29 May, 2026
5	Judy S Slotkin	Director	18,726	0	18,726	2.5%	07 Aug, 2024
6	Ross Anthony Bruck	Vice President	18,250	0	18,250	2.5%	13 May, 2026
7	Hurley Doddy	Director	15,241	0	15,241	2.1%	15 Mar, 2023
8	P Emery Covington	Director	15,000	0	15,000	2.0%	10 Mar, 2026
9	Michael Graf	Officer	7,205	0	7,205	1.0%	02 Mar, 2026
10	Ian Simmonds	Chief Financial Officer	4,996	0	4,996	0.7%	09 Aug, 2022
11	Richard A Higginbotham	Director	0	4,000	4,000	0.5%	09 Mar, 2022
12	Joshua Peck	Vice President	3,140	0	3,140	0.4%	03 Mar, 2026
13	Jennifer Gordon	Vice President	2,500	0	2,500	0.3%	26 May, 2022
14	Anton Brett	Chief Compliance Officer	500	0	500	0.1%	22 Aug, 2022

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

172 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
28 May, 2026	Robert J. Stanley	Ceo	Acquired J	20,000	—	—	23,907	Indirect
11 May, 2026	Ross Anthony Bruck	Vice President	Acquired P	8,000	$17.76	$142.08K	18,250	Direct
09 Mar, 2026	Alan Waxman	Vice President	Acquired P	200,000	$18.18	$3.64Mn	500,000	Indirect
10 Mar, 2026	Alan Waxman	Vice President	Acquired P	45,000	$18.47	$831.15K	545,000	Indirect
06 Mar, 2026	P Emery Covington	Director	Acquired P	7,500	$18.35	$137.63K	15,000	Direct
05 Mar, 2026	Alan Waxman	Vice President	Acquired P	100,000	$18.46	$1.85Mn	100,000	Indirect
06 Mar, 2026	Alan Waxman	Vice President	Acquired P	200,000	$18.42	$3.68Mn	300,000	Indirect
02 Mar, 2026	David Stiepleman	Vice President	Acquired P	20,200	$17.65	$356.53K	25,735	Direct
02 Mar, 2026	Joshua Peck	Vice President	Acquired P	2,840	$17.59	$49.96K	3,140	Direct
27 Feb, 2026	Steven Pluss	Vice President	Acquired P	15,000	$17.72	$265.80K	51,500	Direct
26 Feb, 2026	Michael Graf	Officer	Acquired P	1,000	$18.26	$18.26K	7,205	Direct
18 Nov, 2025	Robert J. Stanley	Co Ceo	Acquired P	10,000	$20.85	$208.50K	24,907	Direct
20 Nov, 2024	Michael Graf	Officer	Acquired P	1,000	$20.53	$20.53K	5,605	Direct
07 Aug, 2024	Michael Graf	Officer	Acquired P	500	$20.45	$10.23K	4,505	Direct
05 Aug, 2024	Judy S Slotkin	Director	Acquired P	7,015	$19.90	$139.60K	18,726	Direct
21 May, 2024	P Emery Covington	Director	Acquired P	7,500	$21.50	$161.28K	7,500	Direct
13 Mar, 2023	Hurley Doddy	Director	Acquired P	2,900	$17.51	$50.78K	15,241	Direct
09 Mar, 2023	Michael Graf	Officer	Acquired P	2,000	$18.55	$37.10K	2,000	Direct
10 Mar, 2023	Michael Graf	Officer	Acquired P	1,500	$17.55	$26.33K	3,500	Direct
18 Aug, 2022	Anton Brett	Chief Compliance Officer	Acquired P	500	$19.25	$9.62K	500	Direct

Showing 1 to 20 of 172 transactions