Insider · CIK 0001214939

HEIDEN WILLIAM K

Reports to the SEC for 5 companies · THOUSAND OAKS, CA

sec.gov

Transactions

Companies

Filings

CIK

0001214939

Forms 4 and 5

Insider transactions

50 trades

Date	Company	Role	Code	Shares	Price	Value	Shares after
2026-06-09	ATRAAtara Biotherapeutics, Inc.A Award	Director	AAward	+12K sh	—	—	34,188
2026-05-19	MGNXMACROGENICS INC · Restricted Stock UnitA Award	Director	AAward	+3,750 sh	—	—	3,750
2026-05-19	MGNXMACROGENICS INC · Stock Option (right to buy)A Award	Director	AAward	+22K sh	—	—	22,000
2026-05-18	MGNXMACROGENICS INCM Exercise/Conversion	Director	MExercise/Conversion	+3,750 sh	—	—	114,750
2026-05-18	MGNXMACROGENICS INC · Restricted Stock UnitM Exercise/Conversion	Director	MExercise/Conversion	−3,750 sh	—	—	0
2025-08-20	MGNXMACROGENICS INCP Purchase	Director	PPurchase	+49.5K sh	$1.49	+$73.8K	111,000
2025-08-19	MGNXMACROGENICS INCP Purchase	Director	PPurchase	+50.5K sh	$1.52	+$76.8K	61,500
2025-06-10	ATRAAtara Biotherapeutics, Inc.A Award	Director	AAward	+7,828 sh	—	—	22,188
2025-05-21	MGNXMACROGENICS INC · Stock Option (right to buy)A Award	Director	AAward	+22K sh	—	—	22,000
2025-05-21	MGNXMACROGENICS INC · Restricted Stock UnitA Award	Director	AAward	+3,750 sh	—	—	3,750
2025-05-20	MGNXMACROGENICS INCM Exercise/Conversion	Director	MExercise/Conversion	+6,500 sh	—	—	11,000
2025-05-20	MGNXMACROGENICS INC · Restricted Stock UnitM Exercise/Conversion	Director	MExercise/Conversion	−6,500 sh	—	—	0
2024-05-21	MGNXMACROGENICS INC · Stock Option (right to buy)A Award	Director	AAward	+16.5K sh	—	—	16,500
2024-05-21	MGNXMACROGENICS INC · Restricted Stock UnitA Award	Director	AAward	+6,500 sh	—	—	6,500
2024-05-20	MGNXMACROGENICS INC · Restricted Stock UnitM Exercise/Conversion	Director	MExercise/Conversion	−4,500 sh	—	—	0
2024-05-20	MGNXMACROGENICS INCM Exercise/Conversion	Director	MExercise/Conversion	+4,500 sh	—	—	4,500
2024-03-31	ATRAAtara Biotherapeutics, Inc.A Award	Director	AAward	+150K sh	—	—	359,000
2023-11-10	ATRAAtara Biotherapeutics, Inc.P Purchase	Director	PPurchase	+100K sh	$0.25	+$25.3K	209,000
2023-05-31	MGNXMACROGENICS INC · Stock Option (right to buy)A Award	Director	AAward	+19K sh	—	—	19,000
2023-05-31	ATRAAtara Biotherapeutics, Inc.A Award	Director	AAward	+57K sh	—	—	109,000
2023-05-31	ATRAAtara Biotherapeutics, Inc. · Non-Qualified Stock Option (Right to Buy)A Award	Director	AAward	+79.5K sh	—	—	79,500
2023-05-31	MGNXMACROGENICS INC · Restricted Stock UnitA Award	Director	AAward	+4,500 sh	—	—	4,500
2022-06-23	ATRAAtara Biotherapeutics, Inc. · Non-Qualified Stock Option (Right to Buy)A Award	Director	AAward	+31.5K sh	—	—	31,500
2022-06-23	ATRAAtara Biotherapeutics, Inc.A Award	Director	AAward	+20.5K sh	—	—	52,000
2022-05-23	MGNXMACROGENICS INC · Stock Option (right to buy)A Award	Director	AAward	+36K sh	—	—	36,000
2021-06-08	ATRAAtara Biotherapeutics, Inc. · Non-Qualified Stock Option (Right to Buy)A Award	Director	AAward	+17.5K sh	—	—	17,500
2021-06-08	ATRAAtara Biotherapeutics, Inc.A Award	Director	AAward	+11K sh	—	—	31,500
2020-06-16	ATRAAtara Biotherapeutics, Inc. · Non-Qualified Stock Option (Right to Buy)A Award	Director	AAward	+24.5K sh	—	—	24,500
2020-06-16	ATRAAtara Biotherapeutics, Inc.A Award	Director	AAward	+8,000 sh	—	—	20,500
2020-03-02	AMAG PHARMACEUTICALS, INC.F Tax Payment	Director, President & CEO	FTax Payment	−4,451 sh	$7.75	−$34.5K	424,612
2020-02-25	AMAG PHARMACEUTICALS, INC.F Tax Payment	Director, President & CEO	FTax Payment	−3,033 sh	$8.84	−$26.8K	484,063
2020-02-23	AMAG PHARMACEUTICALS, INC.F Tax Payment	Director, President & CEO	FTax Payment	−2,960 sh	$9.50	−$28.1K	487,096
2019-06-27	ATRAAtara Biotherapeutics, Inc. · Non-Qualified Stock Option (Right to Buy)A Award	Director	AAward	+13K sh	—	—	13,000
2019-06-27	ATRAAtara Biotherapeutics, Inc.A Award	Director	AAward	+4,000 sh	—	—	12,500
2019-05-09	AMAG PHARMACEUTICALS, INC.P Purchase	Director, President & CEO	PPurchase	+10K sh	$10.70	+$107K	490,056
2019-03-02	AMAG PHARMACEUTICALS, INC.F Tax Payment	Director, President & CEO	FTax Payment	−4,467 sh	$14.76	−$65.9K	480,056
2019-03-01	AMAG PHARMACEUTICALS, INC.F Tax Payment	Director, President & CEO	FTax Payment	−3,535 sh	$14.76	−$52.2K	484,523
2019-02-25	AMAG PHARMACEUTICALS, INC.Stock Option (Right to Buy)A Award	Director, President & CEO	AAward	+70K sh	—	—	70,000
2019-02-25	AMAG PHARMACEUTICALS, INC.A Award	Director, President & CEO	AAward	+132K sh	—	—	488,058
2019-02-25	AMAG PHARMACEUTICALS, INC.A Award	Director, President & CEO	AAward	+31K sh	—	—	356,058
2019-02-23	AMAG PHARMACEUTICALS, INC.F Tax Payment	Director, President & CEO	FTax Payment	−2,957 sh	$15.51	−$45.9K	325,058
2018-08-07	AMAG PHARMACEUTICALS, INC.S Sale	Director, President & CEO	SSale	−5,000 sh	$25.00	−$125K	328,015
2018-06-14	ATRAAtara Biotherapeutics, Inc. · Non-Qualified Stock Option (Right to Buy)A Award	Director	AAward	+5,000 sh	—	—	5,000
2018-06-14	ATRAAtara Biotherapeutics, Inc.A Award	Director	AAward	+1,500 sh	—	—	8,500
2018-06-04	AMAG PHARMACEUTICALS, INC.S Sale	Director, President & CEO	SSale	−20K sh	$25.00	−$500K	333,015
2018-03-02	AMAG PHARMACEUTICALS, INC.Stock Option (Right to Buy)A Award	Director, President & CEO	AAward	+100K sh	—	—	100,000
2018-03-02	AMAG PHARMACEUTICALS, INC.A Award	Director, President & CEO	AAward	+45.5K sh	—	—	363,561
2018-03-02	AMAG PHARMACEUTICALS, INC.F Tax Payment	Director, President & CEO	FTax Payment	−10.5K sh	$21.00	−$221K	353,015
2018-03-02	AMAG PHARMACEUTICALS, INC.A Award	Director, President & CEO	AAward	+45.5K sh	—	—	318,061
2017-06-08	ATRAAtara Biotherapeutics, Inc. · Non-Qualified Stock Option (Right to Buy)A Award	Director	AAward	+21.5K sh	—	—	21,500

Recent filings

Accepted (ET)
Jun 114
HEIDEN WILLIAM K0000905148-26-002921
SEC(opens sec.gov)
May 204
HEIDEN WILLIAM K0001214939-26-000002
SEC(opens sec.gov)
Aug 214
HEIDEN WILLIAM K0001214939-25-000004
SEC(opens sec.gov)
Jun 124
HEIDEN WILLIAM K0000905148-25-002137
SEC(opens sec.gov)
May 224
HEIDEN WILLIAM K0001125345-25-000082
SEC(opens sec.gov)
May 234
HEIDEN WILLIAM K0001125345-24-000128
SEC(opens sec.gov)
May 224
HEIDEN WILLIAM K0001125345-24-000108
SEC(opens sec.gov)
Apr 24
HEIDEN WILLIAM K0000905148-24-001059
SEC(opens sec.gov)
Nov 144
HEIDEN WILLIAM K0000905148-23-001450
SEC(opens sec.gov)
Jun 24
HEIDEN WILLIAM K0001140361-23-028149
SEC(opens sec.gov)
Jun 24
HEIDEN WILLIAM K0001125345-23-000095
SEC(opens sec.gov)

Companies

Address

C/O ATARA BIOTHERAPEUTICS, INC. 1280 RANCHO CONEJO BOULEVARD

THOUSAND OAKS, CA, 91320