SEC CIK 1587114

EcoR1 Capital, LLC

Reported ownership across 4 companies, sourced from SEC Form 4 filings and updated daily.

Current Positions

CompanyShares OwnedAs Of
ANABview stock →7,880,0942025-01-02
PRTAview stock →5,304,5962025-05-06
VYGRview stock →3,851,5072023-01-11
ATRAview stock →1,044,5932026-05-07

Position History — PRTA

Reported shares owned immediately after each Form 4 transaction, over time.

03,861,4277,722,85311,584,2802019-082021-022021-022021-022021-022021-062022-052025-052025-05

Recent Filings — PRTA

DateActivitySharesPriceOwned After
2025-05-06Open-market sale1,984,053$7.645,304,596
2025-05-05Open-market sale977,693$8.117,288,649
2025-05-02Open-market sale3,317,938$8.368,266,342
2022-05-05Open-market sale1,062,736$29.0211,584,280
2022-05-05Open-market buy1,062,736$29.0211,584,280
2022-01-12Open-market buy300,000$37.5011,584,280
2021-06-18Option exercise (out-of-money) (derivative)2,500$0.000
2021-06-18Option exercise (out-of-money)250,000$30.0011,284,280
2021-03-24Open-market buy875,000$20.7511,034,280
2021-02-24Open-market buy10,800$22.0210,159,280
2021-02-23Open-market buy44,400$21.0510,148,480
2021-02-18Open-market buy44,100$3.6810,104,080
2021-02-18Open-market buy44,100$23.6510,104,080
2021-02-17Open-market buy (derivative)2,500$3.682,500
2021-02-17Open-market buy198,840$23.4610,059,980
2021-02-17Open-market buy (derivative)2,500$3.682,500
2021-02-16Open-market buy89,200$22.789,861,140
2021-02-12Open-market buy282,800$20.089,771,940
2021-02-12Open-market buy62,500$20.509,489,140
2019-08-23———9,426,640

Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.