EL
Insider
EcoR1 Capital, LLC
DirectorEcoR1 Capital, LLC (Director) filed 2 Form 4 reports as a reporting entity in the trailing twelve months (2 purchases, 0 sales), most often in ZYME. Across 2 priced purchase filings, the average 21-session return was +2.8% from execution and -5.0% from disclosure (delay-adjusted; derived). The largest single filing was $40.0M of AKTS (2,222,222 sh across 2 lots, as filed), executed Jan 12.
Add to watchlistReturn, ttmiAverage return per filing, trailing twelve months
+2.8%
avg across 2 priced filings
Delay-adjustediThe same average, entered at disclosure dates
-5.0%
same 2 filings, from disclosure
Filings, ttm
2
2 buys · 0 sells
Median delay
2d
execution → disclosure
Volume, ttmiDollar value disclosed in the trailing twelve months
$44.7M
shares × price, as filed
Last traded
May 7
Filed May 11
Median ADV $8.9M across their filed names
Impact on $10,000 · 12M
$8,773 (-12.3%)
S&P 500 $11,725 (+17.2%) · 29.5 pts behind
EcoR1 Capital, LLC
S&P 500
Compounded across filings from disclosure dates · past 12 months
Open performance→Volume by month
Buys $125.6M
Sells $66.0M
Shares × price, as filed · by filing month · past 24 months
Sectors filed on
Healthcare
2 filings
Sector per market data · by filing · past 12 months
Most traded names
ZYME
ZYME
ZYME · 12 buys · 0 sells
12 filings
ADAP
ADAP
ADAP · 0 buys · 1 sell
1 filing
AKTSRecent filings
ATRAPURCHASE
Atara Biotherapeutics, Inc.
View filing →
$4.7M507,407 sh × $9.35
Exec May 7
Filed May 11 · 5:34 PM ET AKTSPURCHASE Aktis Oncology, Inc. View filing → $40.0M
2,222,222 sh across 2 lots
Exec Jan 12
Filed Jan 12 · 8:28 PM ET ADAPSALE Adaptimmune Therapeutics PLC View filing → $6.7M
64,052,538 sh across 3 lots
Exec Jul 28 2025
Filed Jul 30 2025 · 5:30 PM ET ZYMEPURCHASE Zymeworks Inc. View filing → $566K
49,502 sh × $11.43
Exec May 15 2025
Filed May 19 2025 · 5:30 PM ET ITOSPURCHASE iTeos Therapeutics, Inc. View filing → $38.7M
4,958,978 sh across 2 lots
Exec May 14 2025
Filed May 16 2025 · 5:30 PM ET PRTASALE Prothena Corporation plc View filing → $50.8M
6,279,684 sh across 3 lots
Exec May 2 2025
Filed May 6 2025 · 5:30 PM ET ZYMEPURCHASE Zymeworks Inc. View filing → $1.5M
128,713 sh across 2 lots
Exec Apr 16 2025
Filed Apr 18 2025 · 5:30 PM ET ZYMEPURCHASE Zymeworks Inc. View filing → $1.4M
123,018 sh across 2 lots
Exec Apr 1 2025
Filed Apr 2 2025 · 5:30 PM ET More filings →