EcoR1 Capital’s AnaptysBio ANAB Stock Holding History

EcoR1 Capital’s Portfolio ANAB Stock Details ANAB Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q1	$437M	Hold	7,880,094	–	–	18.55%	2
2025 Q4	$382M	Hold	7,880,094	–	–	17.33%	2
2025 Q3	$241M	Hold	7,880,094	–	–	11.58%	2
2025 Q2	$175M	Hold	7,880,094	–	–	10.36%	4
2025 Q1	$146M	Buy	7,880,094 +6,646	+0.1%	+$111K	8.69%	4
2024 Q4	$104M	Buy	7,873,448 +78,452	+1%	+$1.9M	3.94%	9
2024 Q3	$261M	Buy	7,794,996 +273,972	+4%	+$9.36M	8.94%	2
2024 Q2	$188M	Hold	7,521,024	–	–	5.77%	4
2024 Q1	$169M	Hold	7,521,024	–	–	4.28%	7
2023 Q4	$161M	Hold	7,521,024	–	–	4.18%	7
2023 Q3	$135M	Hold	7,521,024	–	–	4.56%	6
2023 Q2	$153M	Hold	7,521,024	–	–	3.75%	8
2023 Q1	$164M	Hold	7,521,024	–	–	5.27%	5
2022 Q4	$233M	Hold	7,521,024	–	–	7.09%	4
2022 Q3	$192M	Hold	7,521,024	–	–	5.66%	4
2022 Q2	$153M	Hold	7,521,024	–	–	5.27%	6
2022 Q1	$186M	Hold	7,521,024	–	–	5.82%	4
2021 Q4	$261M	Hold	7,521,024	–	–	8.33%	2
2021 Q3	$204M	Hold	7,521,024	–	–	7.1%	3
2021 Q2	$195M	Buy	7,521,024 +369,400	+5%	+$8.85M	7.29%	3
2021 Q1	$154M	Buy	7,151,624 +3,928,300	+122%	+$99.1M	6.84%	4
2020 Q4	$69.3M	Hold	3,223,324	–	–	3.73%	9
2020 Q3	$47.5M	Buy	3,223,324 +148,310	+5%	+$2.68M	3.39%	9
2020 Q2	$68.7M	Buy	3,075,014 +39,000	+1%	+$713K	5.07%	8
2020 Q1	$42.9M	Buy	3,036,014 +1,069,914	+54%	+$16.2M	4.48%	7
2019 Q4	$31.9M	Buy	+1,966,100	New	+$46.5M	2.88%	13

Other funds holding ANAB

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

TCM

Tang Capital Management San Diego, California $1.97B AUM 125.1% 1-Year Est. Return

Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

AAA

Affinity Asset Advisors New York $1.94B AUM 374.45% 1-Year Est. Return

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

PAI

Palo Alto Investors Palo Alto, California $654M AUM 77.8% 1-Year Est. Return

6CM

683 Capital Management New York $1.92B AUM 85.52% 1-Year Est. Return

D.E. Shaw & Co New York $166B AUM 43.98% 1-Year Est. Return

FLAM

First Light Asset Management Edina, Minnesota $1.12B AUM 114.45% 1-Year Est. Return

EcoR1 Capital's ANAB Position: Q1 2026 in Review

EcoR1 Capital held its AnaptysBio (ANAB) position steady in Q1 2026 at 7,880,094 shares worth $437M. The position accounts for 18.55% of the portfolio, ranked #2.

EcoR1 Capital first reported a position in ANAB in Q4 2019 and has held it in 26 quarters since. 207 funds tracked by Wall St. Rank hold ANAB as of Q1 2026.

EcoR1 Capital held 7,880,094 shares of AnaptysBio worth $437M as of Q1 2026.
EcoR1 Capital left its AnaptysBio share count unchanged in Q1 2026.
AnaptysBio made up 18.55% of EcoR1 Capital's portfolio in Q1 2026, its #2 holding.
EcoR1 Capital first reported a position in AnaptysBio in Q4 2019 and has held it in 26 quarters since.
207 funds tracked by Wall St. Rank held AnaptysBio as of Q1 2026.

Based on EcoR1 Capital's 13F filing for Q1 2026, filed 15 May 2026.