Doberstein Stephen K

Director at Forte Biosciences, Inc. · on record since Jun 2, 2026
SVP & Chief Scientific Officer at NEKTAR THERAPEUTICS · on record since Feb 7, 2014
Director at Dicerna Pharmaceuticals Inc · on record since Mar 16, 2020

Insider trading activity of Doberstein Stephen K

Transactions on record: 90; since Jan 6, 2010

Open-market buys: 1; $259.2K

Open-market sells: 20; $30.7M

Companies traded: 3; last filing Jun 2, 2026

Figures computed from official regulatory filings — methodology.

Companies where Doberstein Stephen K has traded

Forte Biosciences, Inc.6 tx · Jun 2, 2026
Dicerna Pharmaceuticals Inc12 tx · $127.5K · Dec 29, 2021
NEKTAR THERAPEUTICS72 tx · $44.6M · Sep 9, 2019

Track record of Doberstein Stephen K

Insufficient history for a statistical track record (fewer than 5 open-market buys).

Transaction history of Doberstein Stephen K

Co-insiders of Doberstein Stephen K

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Company	Filed	Type	Qty	Price	Value · USD	Src
Forte Biosciences, Inc.	Jun 2, 2026	AwardD	18,353	0.00 USD	$0	SEC
Forte Biosciences, Inc.	Mar 21, 2025	AwardD	31,000	0.00 USD	$0	SEC
Forte Biosciences, Inc.	Aug 22, 2024	AwardD	50,000	0.00 USD	$0	SEC
Forte Biosciences, Inc.	Sep 20, 2023	AwardD	25,000	0.00 USD	$0	SEC
Forte Biosciences, Inc.	Jun 2, 2022	AwardD	25,000	0.00 USD	$0	SEC
Forte Biosciences, Inc.	May 16, 2022	AwardD	50,000	0.00 USD	$0	SEC
Dicerna Pharmaceuticals Inc	Dec 29, 2021	OtherD	-25,000	—	—	SEC
Dicerna Pharmaceuticals Inc	Dec 29, 2021	Other	-3,333	38.25 USD	$127.5K	SEC
Dicerna Pharmaceuticals Inc	Dec 29, 2021	OtherD	-3,333	—	—	SEC
Dicerna Pharmaceuticals Inc	Dec 29, 2021	OtherD	-15,000	—	—	SEC
Dicerna Pharmaceuticals Inc	Dec 29, 2021	OtherD	-15,000	—	—	SEC
Dicerna Pharmaceuticals Inc	Jun 7, 2021	ExerciseD	-3,333	0.00 USD	$0	SEC
Dicerna Pharmaceuticals Inc	Jun 7, 2021	AwardD	3,333	0.00 USD	$0	SEC
Dicerna Pharmaceuticals Inc	Jun 7, 2021	Exercise	3,333	—	—	SEC
Dicerna Pharmaceuticals Inc	Jun 7, 2021	AwardD	15,000	0.00 USD	$0	SEC
Dicerna Pharmaceuticals Inc	Jun 16, 2020	AwardD	15,000	0.00 USD	$0	SEC
Dicerna Pharmaceuticals Inc	Jun 16, 2020	AwardD	3,333	0.00 USD	$0	SEC
Dicerna Pharmaceuticals Inc	Mar 16, 2020	AwardD	25,000	0.00 USD	$0	SEC
NEKTAR THERAPEUTICS	Sep 9, 2019	Buy	15,000	17.28 USD	$259.2K	SEC
NEKTAR THERAPEUTICS	Aug 19, 2019	Sell	-3,245	18.15 USD	$58.9K	SEC
NEKTAR THERAPEUTICS	May 17, 2019	Sell	-3,461	31.37 USD	$108.6K	SEC
NEKTAR THERAPEUTICS	Feb 21, 2019	Sell	-3,310	42.39 USD	$140.3K	SEC
NEKTAR THERAPEUTICS	Dec 18, 2018	Award	23,950	0.00 USD	$0	SEC
NEKTAR THERAPEUTICS	Dec 18, 2018	AwardD	48,400	0.00 USD	$0	SEC
NEKTAR THERAPEUTICS	Nov 19, 2018	Sell	-4,524	38.25 USD	$173K	SEC

Company	Filed	Type	Qty	Price	Value · USD	Src
Forte Biosciences, Inc.	Jun 2, 2026	AwardD	18,353	0.00 USD	$0	SEC
Forte Biosciences, Inc.	Mar 21, 2025	AwardD	31,000	0.00 USD	$0	SEC
Forte Biosciences, Inc.	Aug 22, 2024	AwardD	50,000	0.00 USD	$0	SEC
Forte Biosciences, Inc.	Sep 20, 2023	AwardD	25,000	0.00 USD	$0	SEC
Forte Biosciences, Inc.	Jun 2, 2022	AwardD	25,000	0.00 USD	$0	SEC
Forte Biosciences, Inc.	May 16, 2022	AwardD	50,000	0.00 USD	$0	SEC
Dicerna Pharmaceuticals Inc	Dec 29, 2021	OtherD	-25,000	—	—	SEC
Dicerna Pharmaceuticals Inc	Dec 29, 2021	Other	-3,333	38.25 USD	$127.5K	SEC
Dicerna Pharmaceuticals Inc	Dec 29, 2021	OtherD	-3,333	—	—	SEC
Dicerna Pharmaceuticals Inc	Dec 29, 2021	OtherD	-15,000	—	—	SEC
Dicerna Pharmaceuticals Inc	Dec 29, 2021	OtherD	-15,000	—	—	SEC
Dicerna Pharmaceuticals Inc	Jun 7, 2021	ExerciseD	-3,333	0.00 USD	$0	SEC
Dicerna Pharmaceuticals Inc	Jun 7, 2021	AwardD	3,333	0.00 USD	$0	SEC
Dicerna Pharmaceuticals Inc	Jun 7, 2021	Exercise	3,333	—	—	SEC
Dicerna Pharmaceuticals Inc	Jun 7, 2021	AwardD	15,000	0.00 USD	$0	SEC
Dicerna Pharmaceuticals Inc	Jun 16, 2020	AwardD	15,000	0.00 USD	$0	SEC
Dicerna Pharmaceuticals Inc	Jun 16, 2020	AwardD	3,333	0.00 USD	$0	SEC
Dicerna Pharmaceuticals Inc	Mar 16, 2020	AwardD	25,000	0.00 USD	$0	SEC
NEKTAR THERAPEUTICS	Sep 9, 2019	Buy	15,000	17.28 USD	$259.2K	SEC
NEKTAR THERAPEUTICS	Aug 19, 2019	Sell	-3,245	18.15 USD	$58.9K	SEC
NEKTAR THERAPEUTICS	May 17, 2019	Sell	-3,461	31.37 USD	$108.6K	SEC
NEKTAR THERAPEUTICS	Feb 21, 2019	Sell	-3,310	42.39 USD	$140.3K	SEC
NEKTAR THERAPEUTICS	Dec 18, 2018	Award	23,950	0.00 USD	$0	SEC
NEKTAR THERAPEUTICS	Dec 18, 2018	AwardD	48,400	0.00 USD	$0	SEC
NEKTAR THERAPEUTICS	Nov 19, 2018	Sell	-4,524	38.25 USD	$173K	SEC