HEIDEN WILLIAM K

Director at GTC BIOTHERAPEUTICS INC · on record since Oct 5, 2009
Chairman, President and CEO at GTC BIOTHERAPEUTICS INC · on record since Jun 17, 2010
Director at ADVANCED MAGNETICS INC · on record since May 29, 2012
President and COO at PRAECIS PHARMACEUTICALS INC · on record since Jan 16, 2004
Director at MACROGENICS INC · on record since May 20, 2026
Director at Atara Biotherapeutics, Inc. · on record since Jun 11, 2026
President & CEO at ADVANCED MAGNETICS INC · on record since May 10, 2017

Insider trading activity of HEIDEN WILLIAM K

Figures computed from official regulatory filings — methodology.

Statistical track record

Free

Win rates and median returns are available with a free account (5 insiders/month).

Company	Filed	Type	Qty	Price	Value · USD	Src
Atara Biotherapeutics, Inc.	Jun 11, 2026	Award	12,000	0.00 USD	$0	SEC
MACROGENICS INC	May 20, 2026	AwardD	22,000	0.00 USD	$0	SEC
MACROGENICS INC	May 20, 2026	ExerciseD	-3,750	0.00 USD	$0	SEC
MACROGENICS INC	May 20, 2026	AwardD	3,750	0.00 USD	$0	SEC
MACROGENICS INC	May 20, 2026	Exercise	3,750	—	—	SEC
MACROGENICS INC	Aug 21, 2025	Buy	50,500	1.52 USD	$76.8K	SEC
MACROGENICS INC	Aug 21, 2025	Buy	49,500	1.49 USD	$73.8K	SEC
Atara Biotherapeutics, Inc.	Jun 12, 2025	Award	7,828	0.00 USD	$0	SEC
MACROGENICS INC	May 22, 2025	AwardD	3,750	0.00 USD	$0	SEC
MACROGENICS INC	May 22, 2025	ExerciseD	-6,500	0.00 USD	$0	SEC
MACROGENICS INC	May 22, 2025	Exercise	6,500	—	—	SEC
MACROGENICS INC	May 22, 2025	AwardD	22,000	0.00 USD	$0	SEC
MACROGENICS INC	May 23, 2024	AwardD	6,500	0.00 USD	$0	SEC
MACROGENICS INC	May 23, 2024	AwardD	16,500	0.00 USD	$0	SEC
MACROGENICS INC	May 22, 2024	ExerciseD	-4,500	0.00 USD	$0	SEC
MACROGENICS INC	May 22, 2024	Exercise	4,500	0.00 USD	$0	SEC
Atara Biotherapeutics, Inc.	Apr 2, 2024	Award	150,000	0.00 USD	$0	SEC
Atara Biotherapeutics, Inc.	Nov 14, 2023	Buy	100,000	0.25 USD	$25K	SEC
MACROGENICS INC	Jun 2, 2023	AwardD	19,000	0.00 USD	$0	SEC
MACROGENICS INC	Jun 2, 2023	AwardD	4,500	0.00 USD	$0	SEC
Atara Biotherapeutics, Inc.	Jun 2, 2023	Award	57,000	0.00 USD	$0	SEC
Atara Biotherapeutics, Inc.	Jun 2, 2023	AwardD	79,500	0.00 USD	$0	SEC
Atara Biotherapeutics, Inc.	Jun 27, 2022	Award	20,500	0.00 USD	$0	SEC
Atara Biotherapeutics, Inc.	Jun 27, 2022	AwardD	31,500	0.00 USD	$0	SEC
MACROGENICS INC	May 24, 2022	AwardD	36,000	0.00 USD	$0	SEC

Company	Filed	Type	Qty	Price	Value · USD	Src
Atara Biotherapeutics, Inc.	Jun 11, 2026	Award	12,000	0.00 USD	$0	SEC
MACROGENICS INC	May 20, 2026	AwardD	22,000	0.00 USD	$0	SEC
MACROGENICS INC	May 20, 2026	ExerciseD	-3,750	0.00 USD	$0	SEC
MACROGENICS INC	May 20, 2026	AwardD	3,750	0.00 USD	$0	SEC
MACROGENICS INC	May 20, 2026	Exercise	3,750	—	—	SEC
MACROGENICS INC	Aug 21, 2025	Buy	50,500	1.52 USD	$76.8K	SEC
MACROGENICS INC	Aug 21, 2025	Buy	49,500	1.49 USD	$73.8K	SEC
Atara Biotherapeutics, Inc.	Jun 12, 2025	Award	7,828	0.00 USD	$0	SEC
MACROGENICS INC	May 22, 2025	AwardD	3,750	0.00 USD	$0	SEC
MACROGENICS INC	May 22, 2025	ExerciseD	-6,500	0.00 USD	$0	SEC
MACROGENICS INC	May 22, 2025	Exercise	6,500	—	—	SEC
MACROGENICS INC	May 22, 2025	AwardD	22,000	0.00 USD	$0	SEC
MACROGENICS INC	May 23, 2024	AwardD	6,500	0.00 USD	$0	SEC
MACROGENICS INC	May 23, 2024	AwardD	16,500	0.00 USD	$0	SEC
MACROGENICS INC	May 22, 2024	ExerciseD	-4,500	0.00 USD	$0	SEC
MACROGENICS INC	May 22, 2024	Exercise	4,500	0.00 USD	$0	SEC
Atara Biotherapeutics, Inc.	Apr 2, 2024	Award	150,000	0.00 USD	$0	SEC
Atara Biotherapeutics, Inc.	Nov 14, 2023	Buy	100,000	0.25 USD	$25K	SEC
MACROGENICS INC	Jun 2, 2023	AwardD	19,000	0.00 USD	$0	SEC
MACROGENICS INC	Jun 2, 2023	AwardD	4,500	0.00 USD	$0	SEC
Atara Biotherapeutics, Inc.	Jun 2, 2023	Award	57,000	0.00 USD	$0	SEC
Atara Biotherapeutics, Inc.	Jun 2, 2023	AwardD	79,500	0.00 USD	$0	SEC
Atara Biotherapeutics, Inc.	Jun 27, 2022	Award	20,500	0.00 USD	$0	SEC
Atara Biotherapeutics, Inc.	Jun 27, 2022	AwardD	31,500	0.00 USD	$0	SEC
MACROGENICS INC	May 24, 2022	AwardD	36,000	0.00 USD	$0	SEC