Daniel Thomas O

see remarks at CELGENE CORP /DE/ · on record since Feb 24, 2012
Director at Epizyme, Inc. · on record since May 30, 2013
Director at Gossamer Bio, Inc. · on record since Jun 5, 2026
Director at Juno Therapeutics, Inc. · on record since Aug 13, 2015
Director at Larimar Therapeutics, Inc. · on record since Mar 10, 2016
Director at Dianthus Therapeutics, Inc. /DE/ · on record since Jun 27, 2018

Insider trading activity of Daniel Thomas O

Transactions on record: 158; since Mar 7, 2012

Open-market buys: 0

Open-market sells: 8; $31.3M

Companies traded: 5; last filing Sep 25, 2026

Figures computed from official regulatory filings — .

Companies where Daniel Thomas O has traded

Gossamer Bio, Inc.11 tx · Sep 25, 2026
Dianthus Therapeutics, Inc. /DE/7 tx · Jun 30, 2022
Larimar Therapeutics, Inc.11 tx · $90K · May 17, 2021
Juno Therapeutics, Inc.2 tx · $764.5K · Mar 7, 2018
CELGENE CORP /DE/127 tx · $45.8M · Feb 2, 2016

Track record of Daniel Thomas O

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

Transaction history of Daniel Thomas O

Co-insiders of Daniel Thomas O

This page republishes public regulatory disclosures.

Company	Filed	Type	Qty	Price	Value · USD	Signals	Src
Gossamer Bio, Inc.Listing on record	Sep 25, 2026	AwardD (derivative)	10,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Gossamer Bio, Inc.Listing on record	Jun 5, 2026	AwardD (derivative)	115,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Gossamer Bio, Inc.Listing on record	Jun 26, 2025	AwardD (derivative)	115,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Gossamer Bio, Inc.Listing on record	Jun 6, 2024	AwardD (derivative)	115,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Gossamer Bio, Inc.Listing on record	Jun 9, 2023	AwardD (derivative)	35,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Gossamer Bio, Inc.Listing on record	Jul 15, 2022	AwardD (derivative)	30,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Dianthus Therapeutics, Inc. /DE/Listing on record	Jun 30, 2022	AwardD (derivative)	20,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Gossamer Bio, Inc.Listing on record	Jun 10, 2021	AwardD (derivative)	23,500	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Dianthus Therapeutics, Inc. /DE/Listing on record	Jun 3, 2021	AwardD (derivative)	18,188	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Larimar Therapeutics, Inc.Listing on record	May 17, 2021	AwardD (derivative)	8,300	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Larimar Therapeutics, Inc.Listing on record	Sep 30, 2020	AwardD (derivative)	16,600	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Gossamer Bio, Inc.Listing on record	Jun 18, 2020	AwardD (derivative)	23,500	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Dianthus Therapeutics, Inc. /DE/Listing on record	Jun 9, 2020	AwardD (derivative)	18,188	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Larimar Therapeutics, Inc.Listing on record	Jun 27, 2019	AwardD (derivative)	27,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Dianthus Therapeutics, Inc. /DE/Listing on record	Jun 11, 2019	AwardD (derivative)	18,188	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Gossamer Bio, Inc.Listing on record	Jun 11, 2019	AwardD (derivative)	23,500	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Gossamer Bio, Inc.Listing on record	Feb 12, 2019	Other	38,095	—	n/a (No price was disclosed in the filing)		SEC
Gossamer Bio, Inc.Listing on record	Feb 12, 2019	OtherD (derivative)	-171,429	—	n/a (No price was disclosed in the filing)		SEC
Larimar Therapeutics, Inc.Listing on record	Jan 28, 2019	AwardD (derivative)	13,280	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Dianthus Therapeutics, Inc. /DE/Listing on record	Jun 27, 2018	Other	24,527	—	n/a (No price was disclosed in the filing)		SEC
Dianthus Therapeutics, Inc. /DE/Listing on record	Jun 27, 2018	OtherD (derivative)	-33,350	—	n/a (No price was disclosed in the filing)		SEC
Dianthus Therapeutics, Inc. /DE/Listing on record	Jun 27, 2018	OtherD (derivative)	-30,028	—	n/a (No price was disclosed in the filing)		SEC
Larimar Therapeutics, Inc.Listing on record	Jun 7, 2018	AwardD (derivative)	20,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Juno Therapeutics, Inc.Listing unverified	Mar 7, 2018	OtherD (derivative)	-12,000	63.71 USD	$764.5K		SEC
Larimar Therapeutics, Inc.Listing on record	Jan 5, 2018	Award	8,687	5.18 USD	$45K	Unusual size	SEC

Company	Filed	Type	Qty	Price	Value · USD	Signals	Src
Gossamer Bio, Inc.Listing on record	Sep 25, 2026	AwardD (derivative)	10,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Gossamer Bio, Inc.Listing on record	Jun 5, 2026	AwardD (derivative)	115,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Gossamer Bio, Inc.Listing on record	Jun 26, 2025	AwardD (derivative)	115,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Gossamer Bio, Inc.Listing on record	Jun 6, 2024	AwardD (derivative)	115,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Gossamer Bio, Inc.Listing on record	Jun 9, 2023	AwardD (derivative)	35,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Gossamer Bio, Inc.Listing on record	Jul 15, 2022	AwardD (derivative)	30,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Dianthus Therapeutics, Inc. /DE/Listing on record	Jun 30, 2022	AwardD (derivative)	20,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Gossamer Bio, Inc.Listing on record	Jun 10, 2021	AwardD (derivative)	23,500	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Dianthus Therapeutics, Inc. /DE/Listing on record	Jun 3, 2021	AwardD (derivative)	18,188	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Larimar Therapeutics, Inc.Listing on record	May 17, 2021	AwardD (derivative)	8,300	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Larimar Therapeutics, Inc.Listing on record	Sep 30, 2020	AwardD (derivative)	16,600	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Gossamer Bio, Inc.Listing on record	Jun 18, 2020	AwardD (derivative)	23,500	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Dianthus Therapeutics, Inc. /DE/Listing on record	Jun 9, 2020	AwardD (derivative)	18,188	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Larimar Therapeutics, Inc.Listing on record	Jun 27, 2019	AwardD (derivative)	27,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Dianthus Therapeutics, Inc. /DE/Listing on record	Jun 11, 2019	AwardD (derivative)	18,188	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Gossamer Bio, Inc.Listing on record	Jun 11, 2019	AwardD (derivative)	23,500	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Gossamer Bio, Inc.Listing on record	Feb 12, 2019	Other	38,095	—	n/a (No price was disclosed in the filing)		SEC
Gossamer Bio, Inc.Listing on record	Feb 12, 2019	OtherD (derivative)	-171,429	—	n/a (No price was disclosed in the filing)		SEC
Larimar Therapeutics, Inc.Listing on record	Jan 28, 2019	AwardD (derivative)	13,280	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Dianthus Therapeutics, Inc. /DE/Listing on record	Jun 27, 2018	Other	24,527	—	n/a (No price was disclosed in the filing)		SEC
Dianthus Therapeutics, Inc. /DE/Listing on record	Jun 27, 2018	OtherD (derivative)	-33,350	—	n/a (No price was disclosed in the filing)		SEC
Dianthus Therapeutics, Inc. /DE/Listing on record	Jun 27, 2018	OtherD (derivative)	-30,028	—	n/a (No price was disclosed in the filing)		SEC
Larimar Therapeutics, Inc.Listing on record	Jun 7, 2018	AwardD (derivative)	20,000	0.00 USD	n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise))		SEC
Juno Therapeutics, Inc.Listing unverified	Mar 7, 2018	OtherD (derivative)	-12,000	63.71 USD	$764.5K		SEC
Larimar Therapeutics, Inc.Listing on record	Jan 5, 2018	Award	8,687	5.18 USD	$45K	Unusual size	SEC