HOWL
Ra Capital Management, L.p. sold $93.1K of HOWL, trimming their stake 5%.
−$93.1K
245,066 sh @ $0
RA CAPITAL MANAGEMENT, L.P.
10% Owner, Director · SEC CIK 1346824
Insider at
HOWL Werewolf Therapeutics, Inc.
ARTV Artiva Biotherapeutics, Inc.
PBLS Parabilis Medicines, Inc.
NKTX Nkarta, Inc.
BCAX Bicara Therapeutics Inc.
CLYM Climb Bio, Inc.
ABOS Acumen Pharmaceuticals, Inc.
TYRA Tyra Biosciences, Inc.
COAG Hemab Therapeutics Holdings, Inc.
ACRV Acrivon Therapeutics, Inc.
ACET Adicet Bio, Inc.
PRLD Prelude Therapeutics Inc
VOR Vor Biopharma Inc.
MLYS Mineralys Therapeutics, Inc.
WVE Wave Life Sciences Ltd.
EVMN Evommune, Inc.
SGP SpyGlass Pharma, Inc.
CDTX Cidara Therapeutics, Inc.
FULC Fulcrum Therapeutics, Inc.
SION Sionna Therapeutics, Inc.
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Buy track record
How this insider's open-market purchases have performed36%
of buys now in profit
12 up · 21 down
Avg return since buy+27.5%
Median return−0.1%
Best trade+401.7%
Worst trade−26.9%
Buys scored33
Average return by holding period — separates good entry timing from riding one long winner
After 1 month
+9.4%
75% won · 28 trades
After 3 months
+52.9%
67% won · 9 trades
After 6 months
+327.8%
100% won · 2 trades
After 12 months
—
not elapsed yet
| Date | Company | 90d trend | Buy price | Value | ΔOwn | 1M | 3M | 6M | 12M | To date |
|---|---|---|---|---|---|---|---|---|---|---|
| Jun 11, 2026 | ARTV | $8 | $4.34M | +3.5% | — | — | — | — | +6.7% | |
| Jun 10, 2026 | ARTV | $7 | $721 | — | — | — | — | — | +15.1% | |
| Jun 9, 2026 | ARTV | $7 | $3.31M | +3.2% | — | — | — | — | +17.5% | |
| May 20, 2026 | COAG | $25 | $24.8K | — | — | — | — | — | −5.6% | |
| May 19, 2026 | COAG | $25 | $94.9K | +0.1% | — | — | — | — | −1.8% | |
| May 12, 2026 | COAG | $25 | $159K | +0.1% | −3.6% | — | — | — | −3.6% | |
| May 11, 2026 | ARTV | $12 | $75M | +75% | −24.5% | — | — | — | −19.4% | |
| May 11, 2026 | COAG | $24 | $346.2K | +0.2% | +7.8% | — | — | — | −0.1% | |
| May 11, 2026 | COAG | $25 | $643K | +0.4% | +7.8% | — | — | — | −0.1% | |
| May 8, 2026 | COAG | $25 | $37K | — | +1.7% | — | — | — | −0.6% | |
| May 7, 2026 | COAG | $24 | $192.8K | +0.1% | −0.7% | — | — | — | −3.0% | |
| May 7, 2026 | COAG | $25 | $49.5K | — | −0.7% | — | — | — | −3.0% | |
| May 6, 2026 | COAG | $24 | $347.3K | +0.2% | +2.2% | — | — | — | −0.1% | |
| May 6, 2026 | COAG | $25 | $1.33M | +0.9% | +2.2% | — | — | — | −0.1% | |
| May 5, 2026 | COAG | $25 | $2.14M | +1.4% | +1.2% | — | — | — | −0.1% | |
| May 5, 2026 | COAG | $25 | $256.7K | +0.2% | +1.2% | — | — | — | −0.1% | |
| May 4, 2026 | COAG | $18 | $45.74M | +70% | +0.3% | — | — | — | −1.4% | |
| May 4, 2026 | COAG | $18 | $2.41M | +60% | +0.3% | — | — | — | −1.4% | |
| Mar 30, 2026 | MLYS | $24 | $1.41M | +1.0% | +13.4% | — | — | — | +2.2% | |
| Mar 30, 2026 | WVE | $7 | $6.31M | +3.7% | +6.6% | — | — | — | −10.7% | |
| Mar 27, 2026 | MLYS | $24 | $7.35M | +5.7% | +14.0% | — | — | — | +1.5% | |
| Mar 27, 2026 | WVE | $6 | $16.05M | +11% | +8.9% | — | — | — | −7.2% | |
| Mar 26, 2026 | WVE | $6 | $30.02M | +27% | +11.9% | — | — | — | −4.7% | |
| Mar 26, 2026 | WVE | $6 | $2.24M | +1.5% | +11.9% | — | — | — | −4.7% | |
| Feb 26, 2026 | BCAX | $16 | $4.8M | +7.0% | +12.6% | +30.8% | — | — | +29.1% | |
| Feb 20, 2026 | ACET | $7 | $543.4K | +6.7% | −3.1% | +8.7% | — | — | +16.0% | |
| Feb 19, 2026 | ACET | $7 | $535.5K | +7.2% | −5.0% | −2.6% | — | — | +11.3% | |
| Feb 18, 2026 | ACET | $7 | $525K | +7.8% | −1.8% | +6.2% | — | — | +17.3% | |
| Feb 9, 2026 | SGP | $16 | $55.07M | +136% | +3.6% | −9.2% | — | — | −26.9% | |
| Feb 9, 2026 | SGP | $16 | $3.97M | +14% | +3.6% | −9.2% | — | — | −26.9% | |
| Jan 5, 2026 | CLYM | $4 | $24.9K | +0.2% | +31.4% | +90.4% | — | — | +226.0% | |
| Dec 12, 2025 | CLYM | $3 | $290.2K | +3.1% | +56.7% | +142.0% | +281.3% | — | +284.7% | |
| Dec 11, 2025 | CLYM | $2 | $464.6K | +6.9% | +104.3% | +218.7% | +374.3% | — | +401.7% |
How this is calculated. We score only open-market purchases (SEC code
P) — the buys that carry real signal. Each trade's return is measured from the adjusted closing price on the purchase date to the latest close, accounting for stock splits and dividends. The 1M/3M/6M/12M columns show the same trade's return after each fixed holding period; a dash means that horizon hasn't elapsed yet or isn't priceable. Sales are excluded because insiders sell for many routine reasons. With only 33 scored trades, treat this as a small sample, not a verdict.
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Open-market buys
$266.03M
33 trades
Open-market sells
$115.14M
66 trades
Net flow
+$150.89M
Net buying
Total filings
113
transactions shown
Full transaction history
All Form 4 activity across every company, newest firstHOWL
Ra Capital Management, L.p. sold $6.6K of HOWL, trimming their stake 5%.
−$6.6K
17,437 sh @ $0
ARTV
Ra Capital Management, L.p., ARTV's 10% owner, spent $4.34M of their own money on 548,580 shares at $8, growing their stake 3%. Their tracked buys have a 17% win rate.
+$4.34M
548,580 sh @ $8
HOWL
Ra Capital Management, L.p. sold $15.9K of HOWL, trimming their stake 1%.
−$15.9K
42,872 sh @ $0
HOWL
Ra Capital Management, L.p. sold $1.1K of HOWL, trimming their stake 1%.
−$1.1K
3,051 sh @ $0
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ARTV
Ra Capital Management, L.p., ARTV's 10% owner, spent $721 of their own money on 103 shares at $7. Their tracked buys have a 17% win rate.
+$721
103 sh @ $7
HOWL
Ra Capital Management, L.p. sold $127.7K of HOWL, trimming their stake 6%.
−$127.7K
345,235 sh @ $0
HOWL
Ra Capital Management, L.p. sold $9.1K of HOWL, trimming their stake 6%.
−$9.1K
24,565 sh @ $0
ARTV
Ra Capital Management, L.p., ARTV's 10% owner, spent $3.31M of their own money on 479,039 shares at $7, growing their stake 3%. Their tracked buys have a 17% win rate.
+$3.31M
479,039 sh @ $7
ABOS
+$0
35,500 sh
COAG
Ra Capital Management, L.p., COAG's 10% owner, spent $24.8K of their own money on 996 shares at $25. Their tracked buys have a 17% win rate.
+$24.8K
996 sh @ $25
COAG
Ra Capital Management, L.p., COAG's 10% owner, spent $94.9K of their own money on 3,802 shares at $25. Their tracked buys have a 17% win rate.
+$94.9K
3,802 sh @ $25
ACRV
+$0
9,366 sh
COAG
Ra Capital Management, L.p., COAG's 10% owner, spent $159K of their own money on 6,387 shares at $25. Their tracked buys have a 17% win rate.
+$159K
6,387 sh @ $25
HOWL
Ra Capital Management, L.p. sold $60.4K of HOWL, trimming their stake 2%.
−$60.4K
94,432 sh @ $1
HOWL
Ra Capital Management, L.p. sold $4.3K of HOWL, trimming their stake 2%.
−$4.3K
6,719 sh @ $1
ARTV
Ra Capital Management, L.p., ARTV's 10% owner, spent $75M of their own money on 6.51M shares at $12, growing their stake 75%. Their tracked buys have a 17% win rate.
+$75M
6.51M sh @ $12
HOWL
Ra Capital Management, L.p. sold $54.7K of HOWL, trimming their stake 1%.
−$54.7K
81,678 sh @ $1
HOWL
Ra Capital Management, L.p. sold $3.9K of HOWL, trimming their stake 1%.
−$3.9K
5,812 sh @ $1
COAG
Ra Capital Management, L.p., COAG's 10% owner, spent $346.2K of their own money on 14,149 shares at $24. Their tracked buys have a 17% win rate.
+$346.2K
14,149 sh @ $24
COAG
Ra Capital Management, L.p., COAG's 10% owner, spent $643K of their own money on 25,720 shares at $25. Their tracked buys have a 17% win rate.
+$643K
25,720 sh @ $25
HOWL
Ra Capital Management, L.p. sold $249.6K of HOWL, trimming their stake 6%.
−$249.6K
351,514 sh @ $1
HOWL
Ra Capital Management, L.p. sold $17.8K of HOWL, trimming their stake 6%.
−$17.8K
25,012 sh @ $1
COAG
Ra Capital Management, L.p., COAG's 10% owner, spent $37K of their own money on 1,483 shares at $25. Their tracked buys have a 17% win rate.
+$37K
1,483 sh @ $25
COAG
Ra Capital Management, L.p., COAG's 10% owner, spent $192.8K of their own money on 7,921 shares at $24. Their tracked buys have a 17% win rate.
+$192.8K
7,921 sh @ $24
COAG
Ra Capital Management, L.p., COAG's 10% owner, spent $49.5K of their own money on 1,985 shares at $25. Their tracked buys have a 17% win rate.
+$49.5K
1,985 sh @ $25
COAG
Ra Capital Management, L.p., COAG's 10% owner, spent $347.3K of their own money on 14,611 shares at $24. Their tracked buys have a 17% win rate.
+$347.3K
14,611 sh @ $24
COAG
Ra Capital Management, L.p., COAG's 10% owner, spent $1.33M of their own money on 53,407 shares at $25, growing their stake 1%. Their tracked buys have a 17% win rate.
+$1.33M
53,407 sh @ $25
COAG
Ra Capital Management, L.p., COAG's 10% owner, spent $2.14M of their own money on 87,143 shares at $25, growing their stake 1%. Their tracked buys have a 17% win rate.
+$2.14M
87,143 sh @ $25
COAG
Ra Capital Management, L.p., COAG's 10% owner, spent $256.7K of their own money on 10,268 shares at $25. Their tracked buys have a 17% win rate.
+$256.7K
10,268 sh @ $25
Frequently asked questions
How is RA CAPITAL MANAGEMENT, L.P.'s win rate calculated?
We take every open-market purchase (SEC code P) we can match to a stock price, then compare the split- and dividend-adjusted price on the purchase date to the most recent close. The win rate is the share of those buys currently trading above the purchase price. Sales and share grants are not scored.
Why are some buys not included in the score?
A purchase is excluded if we can't price it — for example if the ticker is missing from the filing, the company has been delisted, or the security isn't a common stock we can match to market data. Excluded counts are shown next to the scored total.
What do the 1M / 3M / 6M / 12M columns mean?
They show each purchase's return after a fixed holding period — one, three, six, and twelve months from the buy date — using split- and dividend-adjusted prices. This separates good entry timing from simply holding a long-running winner. A dash means that horizon hasn't elapsed yet for that trade, or the stock couldn't be priced at that date.
Does a high win rate mean I should copy this insider?
No. Past performance does not predict future results, sample sizes are often small, and an insider's edge in their own company doesn't transfer to yours. This is context, not a recommendation. InsiderSource is not investment advice.
Where does this data come from?
Trades come from RA CAPITAL MANAGEMENT, L.P.'s SEC Form 4 filings on EDGAR. Prices come from public market data and are split/dividend-adjusted. Always verify against the original filings before acting.