Starling Oncology STLN Insider Ownership

NASDAQ STLN

$6.46 +0.03 (+0.47%)

At close: Oct 19, 2026 · 4:00 PM EDT

Insider Holdings by Owner

30.66Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

28.37%

▼-0.233% pp QoQ

Shares Held by Insiders

29.23Mn

filed for Sep 2026

▼-0.82% QoQ

Shares Outstanding

103.03Mn

103,031,493 shares

Direct Holdings

23.81Mn

Indirect: 5.42Mn

Net Shares Traded (QoQ)

-240.57K

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 5, 2026

In the last 12 months, insiders at Starling Oncology made open-market purchases of $2.69 million (789.91K shares) and open-market sales of $2.81 million (505.06K shares).

A count shows one insider buying STLN stock on the open market over the past 12 months and 5 insiders selling.
Among STLN's insiders, Jorey Chernett (10% owner) was the top open-market buyer in the past 12 months, with $2.69 million of stock purchased (789.91K shares) and the latest purchase on August 14, 2026.
Meanwhile, the largest open-market sales of STLN in the past 12 months were by Brad Hively (Director), totaling $2 million (312.19K shares), most recently on August 21, 2026.
Beyond open-market trades, insiders at Starling Oncology received 843.4K shares in stock awards and acquired 23.45K shares through option exercises and conversions in the last 12 months.
Per Business Quant data, Starling Oncology insiders hold 29.23Mn shares in total based on their latest Form 4 filings, or 28.37% of the 103.03Mn shares outstanding; that total is down 0.82% from 29.47Mn shares at the end of Q2 2026.
Indirect holdings, through trusts, partnerships, family members and other entities, make up 18.53% (5.42Mn shares) of Starling Oncology's insider total, with the other 81.47% (23.81Mn shares) held directly.
The insider holdings in Starling Oncology belong to 17 insiders who have reported on Form 4 within the past two years.
STLN's three largest insider shareholders, per their latest Form 4 filings, are Jorey Chernett (10% owner, 10.66Mn shares), Richard A. Barasch (Director, 7.13Mn shares) and M33 Growth I L.P. (Director, 5.44Mn shares).
Jorey Chernett holds 36.48% of the combined insider position in Starling Oncology.
A total of 54 Form 4 filings with transactions in Starling Oncology stock were made over the past 12 months, by 15 insiders.
This summary of Starling Oncology insider activity covers Form 4 filings through August 24, 2026.

Form 4 Holdings

Insiders Holding STLN

Insiders 25

Shares held 30.66Mn

Of outstanding 29.75%

#	Insider	Position	Direct	Indirect	Total	Share of Insiders	Last Filed
1	Jorey Chernett	TenPercentOwner	10,660,858	0	10,660,858	34.8%	17 Aug, 2026
2	Growth I L.P. M33	Director	5,444,207	0	5,444,207	17.8%	20 Nov, 2025
3	Daniel Virnich	Chief Executive Officer	4,124,475	0	4,124,475	13.5%	22 May, 2026
4	Richard A Barasch	Director	417,193	2,635,881	3,053,074	10.0%	28 Jul, 2025
5	Brad Hively	Chief Executive Officer	1,034,956	0	1,034,956	3.4%	24 Aug, 2026
6	Mihir Shah	Chief Financial Officer	835,174	0	835,174	2.7%	23 May, 2024
7	Robert Ross Carter	Chief Financial Officer	649,975	0	649,975	2.1%	22 May, 2026
8	Anne Mcgeorge	Director	515,881	0	515,881	1.7%	29 Jul, 2026
9	Yale Podnos	Chief Medical Officer	493,863	0	493,863	1.6%	16 Jul, 2026
10	Karen Marie Johnson	Director	486,595	0	486,595	1.6%	29 Jul, 2026
11	Gabriel Ling	Director	442,596	0	442,596	1.4%	24 Nov, 2025
12	Mark L Pacala	Director	421,290	0	421,290	1.4%	29 Jul, 2026
13	Matthew P Miller	Chief Operating Officer	418,317	0	418,317	1.4%	21 Mar, 2023
14	Mohit Kaushal	Director	382,969	0	382,969	1.2%	29 Jul, 2026
15	Jeremy Castle	Chief Operating Officer	337,417	0	337,417	1.1%	22 May, 2025
16	Richy Agajanian	TenPercentOwner	0	253,436	253,436	0.8%	13 May, 2022
17	Healthcare Partners, L.P. Havencrest	TenPercentOwner	0	252,626	252,626	0.8%	20 Aug, 2024
18	Kristin England	Chief Administrative Officer	153,780	0	153,780	0.5%	01 Apr, 2026
19	Maeve O'Meara	Director	151,804	0	151,804	0.5%	28 Dec, 2023
20	Scott Dalgleish	Chief Financial Officer	151,008	0	151,008	0.5%	23 Mar, 2022
21	Jeffrey Langsam	Chief Clinical Officer	127,650	0	127,650	0.4%	01 Apr, 2026
22	Ravi Yang Sarin	Director	121,326	0	121,326	0.4%	21 Mar, 2023
23	Mark Stolper	Director	56,957	0	56,957	0.2%	29 Jul, 2026
24	Kimberly Jo Tzoumakas	Director	46,301	0	46,301	0.2%	29 Jul, 2026
25	Diona Simoneit	Chief Accounting Officer	39,705	0	39,705	0.1%	21 Nov, 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

434 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
21 Aug, 2026	Brad Hively	Director	Disposed S	298,853	$6.51	$1.95Mn	411,976	Direct
14 Aug, 2026	Jorey Chernett	TenPercentOwner	Acquired P	12,000	$6.54	$78.48K	10,660,858	Direct
13 Aug, 2026	Jorey Chernett	TenPercentOwner	Disposed S	100	$6.24	$624	0	Direct
27 Jul, 2026	Mohit Kaushal	Director	Acquired A	33,133	$0.00	$0	205,716	Direct
27 Jul, 2026	Mark L Pacala	Director	Acquired A	30,120	$0.00	$0	286,881	Direct
27 Jul, 2026	Kimberly Jo Tzoumakas	Director	Acquired A	29,116	$0.00	$0	46,301	Direct
27 Jul, 2026	Brad Hively	Director	Acquired A	27,108	$0.00	$0	710,829	Direct
27 Jul, 2026	Mark Stolper	Director	Acquired A	31,124	$0.00	$0	56,957	Direct
27 Jul, 2026	Anne Mcgeorge	Director	Acquired A	41,165	$0.00	$0	332,535	Direct
27 Jul, 2026	Karen Marie Johnson	Director	Acquired A	31,124	$0.00	$0	319,410	Direct
21 Jul, 2026	Jorey Chernett	TenPercentOwner	Acquired P	18,000	$5.27	$94.86K	10,648,858	Direct
14 Jul, 2026	Yale Podnos	Chief Medical Officer	Acquired M	17,974	$1.87	$33.61K	277,501	Direct
14 Jul, 2026	Yale Podnos	Chief Medical Officer	Disposed S	17,974	$6.43	$115.55K	259,527	Direct
14 Jul, 2026	Yale Podnos	Chief Medical Officer	Acquired M	5,478	$2.00	$10.96K	265,005	Direct
14 Jul, 2026	Yale Podnos	Chief Medical Officer	Disposed S	5,478	$6.35	$34.79K	259,527	Direct
14 Jul, 2026	Yale Podnos	Chief Medical Officer	Acquired M	17,974	$1.87	$33.61K	0	Direct
14 Jul, 2026	Yale Podnos	Chief Medical Officer	Acquired M	5,478	$2.00	$10.96K	0	Direct
10 Jul, 2026	Jorey Chernett	TenPercentOwner	Acquired P	15,000	$5.85	$87.75K	10,630,858	Direct
07 Jul, 2026	Mark Stolper	Director	Acquired A	25,833	$0.00	$0	25,833	Direct
07 Jul, 2026	Kimberly Jo Tzoumakas	Director	Acquired A	17,185	$0.00	$0	17,185	Direct

Showing 1 to 20 of 434 transactions