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SCHEDULE 13D/A Filed 2026-08-14 Event 2026-08-12 SEC 0001346824-26-000228 →

RA CAPITAL MANAGEMENT, L.P. → SEPTERNA, INC. SEPN

Stake: — Shares: 5,525,324 Class: Common Stock, par value $0.001 per share

Item 4 — Purpose of Transaction

Not extracted from this filing — typically because it's an amendment (13D/A) and Item 4 is unchanged from the parent filing. Read the raw SEC filing →

Cross-References

Insider Activity (last 365d)
1 transaction
1 buys · 0 sales · 0 awards/exercises
Issuer Cluster
1 13D/G filings on this issuer
0 other filings besides this one
Filer Track Record
86 filings by this filer
85 other filings in the data moat
Short Interest · settle 2026-09-30
DTC 8.80
3,096,190 shares short · +7.0% vs prior

Form 4 Insider Transactions · last 365d

DateInsiderRoleTypeSharesPriceValue
2026-06-26 RA CAPITAL MANAGEMENT, L.P. director, 10%+ owner Award 15,000 $37.34 $560K

Other Filings by RA CAPITAL MANAGEMENT, L.P.

FiledFormIssuerStakeShares
2026-09-22 SCHEDULE 13G BetterLife Pharma Inc. — — view →
2026-09-21 SCHEDULE 13D/A SIONNA THERAPEUTICS, INC. 14.30% 6,476,193 view →
2026-09-17 SCHEDULE 13D/A TYRA BIOSCIENCES, INC. — 14,130,492 view →
2026-09-03 SCHEDULE 13G JATT III Acquisition Corp — — view →
2026-08-17 SCHEDULE 13G Latigo Biotherapeutics, Inc. — — view →
2026-08-11 SCHEDULE 13D/A Wave Life Sciences, Inc. — 34,314,406 view →
2026-08-10 SCHEDULE 13D/A SAB Biotherapeutics, Inc. — 9,609,852 view →
2026-07-23 SCHEDULE 13D/A ARTIVA BIOTHERAPEUTICS, INC. — 18,415,956 view →
2026-07-22 SCHEDULE 13D/A Freenome, Inc. — 15,367,270 view →
2026-07-21 SCHEDULE 13D/A VOR BIOPHARMA INC. — 12,937,855 view →
2026-07-20 SCHEDULE 13G Agenus Inc. — — view →
2026-07-07 SCHEDULE 13D/A Climb Bio, Inc. CLYM 33.00% 23,249,186 view →
2026-07-02 SCHEDULE 13D/A WEREWOLF THERAPEUTICS, INC. HOWL 4.10% 1,985,541 view →
2026-06-26 SCHEDULE 13D/A WEREWOLF THERAPEUTICS, INC. HOWL 6.00% 2,915,742 view →
2026-06-24 SCHEDULE 13D/A SOLID BIOSCIENCES INC. SLDB — 12,036,126 view →
2026-06-22 SCHEDULE 13D/A WEREWOLF THERAPEUTICS, INC. HOWL — 3,654,307 view →
2026-06-18 SCHEDULE 13D Parabilis Medicines, Inc. PBLS 23.80% 28,933,371 view →
2026-06-15 SCHEDULE 13D/A WEREWOLF THERAPEUTICS, INC. HOWL — 5,138,703 view →
2026-06-15 SCHEDULE 13D/A ARTIVA BIOTHERAPEUTICS, INC. ARTV 36.60% 17,811,623 view →
2026-06-03 SCHEDULE 13G Editas Medicine, Inc. EDIT — — view →
Showing 20 of 85

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