EcoR1 Capital, LLC

ZYME

EcoR1 Capital, LLC serves as 10 percent owner at Zymeworks Inc. (ZYME). This page tracks their complete SEC Form 4 insider trading history including stock purchases and sales.

Total Buys

12 trades

$71.18M

Total Sells

2 trades

$15.58M

Net Position

Net Buyer

$55.61M

Companies Traded

ATRA, ZYME, TNGX, VYGR

Active Period

Jun 2022 – May 2026

14 total trades

Most Recent

Buy ATRA

May 11, 2026 · $4.74M

EcoR1 Capital, LLC's Insider Trading at Zymeworks Inc. (ZYME)

Buys

10 · $63.78M

Sells

0 · $0.00

Total Shares Bought

6,896,780

Total Shares Sold

ZYME Price Chart

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Date	Type	Shares	Avg Price	Value	Shares After
Jan 21, 2025	Buy	141,429	$13.88	$1.96M	15,720,161
Jan 15, 2025	Buy	167,654	$13.59	$2.28M	15,578,732
Jan 10, 2025	Buy	225,119	$13.21	$2.97M	15,411,078
Jan 2, 2025	Buy	363,369	$14.64	$5.32M	15,185,959
Dec 27, 2024	Buy	130,309	$14.44	$1.88M	14,822,590
Jun 21, 2023	Buy	3,350,000	$8.12	$27.20M	13,437,473
Mar 30, 2023	Buy	200,000	$8.00	$1.60M	10,087,473
Jan 23, 2023	Buy	307,500	$9.70	$2.98M	9,887,473
Jan 18, 2023	Buy	985,100	$9.84	$9.70M	9,579,973
Jan 12, 2023	Buy	1,026,300	$7.67	$7.87M	8,594,873

EcoR1 Capital, LLC's Insider Trading at Voyager Therapeutics, Inc. (VYGR)

Buys

1 · $2.66M

Sells

1 · $7.14M

Total Shares Bought

477,400

Total Shares Sold

902,400

VYGR Price Chart

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Date	Type	Shares	Avg Price	Value	Shares After
Jan 11, 2023	Sell	902,400	$7.91	$7.14M	4,297,907
Jun 23, 2022	Buy	477,400	$5.58	$2.66M	4,753,907

EcoR1 Capital, LLC's Insider Trading at Tango Therapeutics, Inc. (TNGX)

Buys

0 · $0.00

Sells

1 · $8.44M

Total Shares Bought

Total Shares Sold

2,700,000

TNGX Price Chart

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Date	Type	Shares	Avg Price	Value	Shares After
Nov 8, 2024	Sell	2,700,000	$3.12	$8.44M	11,836,178

EcoR1 Capital, LLC's Insider Trading at Atara Biotherapeutics, Inc. (ATRA)

Buys

1 · $4.74M

Sells

0 · $0.00

Total Shares Bought

507,407

Total Shares Sold

ATRA Price Chart

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Date	Type	Shares	Avg Price	Value	Shares After
May 11, 2026	Buy	507,407	$9.35	$4.74M	1,552,000

Related Insiders

Adam Crystal

President, R&D

TNGXSell · Jun 3, 2026

AnhCo Nguyen

President and CEO

ATRASell · May 20, 2026

Yanina Grant-Huerta

officer: Chief Accounting Officer

ATRASell · May 20, 2026

Panacea Innovation Ltd

10 percent owner

ATRASell · May 11, 2026

Daniella Beckman

officer: Chief Financial Officer

TNGXSell · Feb 4, 2026

Barbara Weber

director, officer: Director, Executive Chair

TNGXSell · Feb 4, 2026

Mark Hollywood

officer: EVP & Chief Operating Officer

ZYMESell · Jan 13, 2026

Kenneth Galbraith

director, officer: Chair & CEO

ZYMESell · Jan 12, 2026

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