Ra Capital Management, L.P.

Director

Ra Capital Management, L.P. (Director) filed 31 Form 4 reports as a reporting entity in the trailing twelve months (23 purchases, 8 sales, 1 filed past the two-business-day deadline), most often in Artiva Biotherapeutics, Inc. (ARTV). Across 22 priced purchase filings, the average 21-session return was +16.2% from execution and +14.2% from disclosure (delay-adjusted; derived). The largest single filing was $423.8M of PBLS (21,188,750 sh across 2 lots, as filed), executed Jun 11. Data as of Nov 8 2026.

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Return, ttmiAverage return per filing, trailing twelve months

+16.2%

avg across 22 priced filings

Delay-adjustediThe same average, entered at disclosure dates

+14.2%

same 22 filings, from disclosure

Filings, ttm

23 buys · 8 sells · 1 late

Median delay

execution → disclosure

Volume, ttmiDollar value disclosed in the trailing twelve months

$871.5M

shares × price, as filed

Last traded

Nov 2

Filed Nov 3

Median ADV $10.0M across their filed names

Impact on $10,000 · 12M

$25,798 (+158.0%)

S&P 500 $10,907 (+9.1%) · 148.9 pts ahead

Ra Capital Management, L.P. S&P 500

Derived: compounded across filings from disclosure dates · past 12 months

Open performance→

Volume by month

Buys $856.6M Sells $128.1M

Shares × price, as filed · by filing month · past 24 months

Sectors filed on

Healthcare 25 filings Not on file 5 filings

Sector per market data · by filing · past 12 months

Most traded names

ARTV

Artiva Biotherapeutics, Inc. ARTV · 9 buys · 0 sells 9 filings COAG

Hemab Therapeutics Holdings, Inc. COAG · 4 buys · 0 sells 4 filings SION

Sionna Therapeutics, Inc. SION · 1 buy · 2 sells 3 filings VOR VOR 0 buys · 3 sells 3 filings HOWL

Werewolf Therapeutics, Inc. HOWL · 0 buys · 2 sells 2 filings

Recent filings

COAGPURCHASE Hemab Therapeutics Holdings, Inc. View filing → $159K
6,387 sh × $24.90
Exec May 12
Filed May 14 · 5:21 PM ET ARTVPURCHASE Artiva Biotherapeutics, Inc. View filing → $75.0M
6,510,416 sh × $11.52
Exec May 11
Filed May 13 · 5:45 PM ET HOWLSALE Werewolf Therapeutics, Inc. View filing → $250K
351,514 sh × $0.71
Exec May 8
Filed May 12 · 5:30 PM ET COAGPURCHASE Hemab Therapeutics Holdings, Inc. View filing → $1.2M
47,790 sh across 3 lots
Exec May 7
Filed May 11 · 5:44 PM ET COAGPURCHASE Hemab Therapeutics Holdings, Inc. View filing → $52.2M
2,840,429 sh across 6 lots
Exec May 4
Filed May 6 · 7:16 PM ET VORSALE Vor Biopharma Inc. View filing → $10.2M
630,374 sh across 2 lots
Exec Apr 17
Filed Apr 21 · 5:30 PM ET VORSALE Vor Biopharma Inc. View filing → $11.9M
737,989 sh across 3 lots
Exec Apr 13
Filed Apr 15 · 5:30 PM ET MLYSPURCHASE Mineralys Therapeutics, Inc. View filing → $8.8M
369,000 sh across 2 lots
Exec Mar 27
Filed Mar 31 · 4:15 PM ET More filings →