WaveMan · Form 4
RA Capital Nexus Fund III, L.P. insider trades
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RA Capital Nexus Fund III, L.P. insider trades

RA Capital Nexus Fund III, L.P. has filed 9 Form 4s with the SEC that we hold, for Bicara Therapeutics Inc. (BCAX) (Director, 10% owner), Mineralys Therapeutics, Inc. (MLYS) (Director), Sionna Therapeutics, Inc. (SION) (Director, 10% owner) and Artiva Biotherapeutics, Inc. (ARTV) (Director, 10% owner), among 6 companies in all. Across all of them we count 8 purchases worth $569.3M and 8 sales worth $14.8M reported on Form 4. In the last 12 months: 3 purchases ($498.8M) and 8 sales ($14.8M). The largest single trade was a purchase of 19,728,353 shares of Parabilis Medicines, Inc. worth $394.6M, dated 2026-06-11. The first filing on our record is dated 2023-02-16 and the latest 2026-06-18.

Bicara Therapeutics Inc. (BCAX)

Director, 10% owner · 2 filings · 2 purchases and sales
Trade dateCodeSharesValue as filedFiled
2024-09-16P, purchase reported on Form 41,680,520$30.2M2024-09-18
2024-09-16P, purchase reported on Form 4152,480$2.7M2024-09-18

Mineralys Therapeutics, Inc. (MLYS)

Director · 2 filings · 3 purchases and sales
Trade dateCodeSharesValue as filedFiled
2023-02-14P, purchase reported on Form 4131,600$2.1M2023-02-16
2023-02-14P, purchase reported on Form 41,118,400$17.9M2023-02-16
2025-03-13P, purchase reported on Form 41,296,296$17.5M2025-03-17

Sionna Therapeutics, Inc. (SION)

Director, 10% owner · 2 filings · 8 purchases and sales
Trade dateCodeSharesValue as filedFiled
2025-10-24S, sale reported on Form 466,672$2.6M2025-10-28
2025-10-24S, sale reported on Form 4122,271$4.8M2025-10-28
2025-10-24S, sale reported on Form 4107,941$4.3M2025-10-28
2025-10-24S, sale reported on Form 414,116$557.6K2025-10-28
2025-10-28S, sale reported on Form 43,624$143.4K2025-10-28
2025-10-28S, sale reported on Form 410,476$414.6K2025-10-28
2025-10-28S, sale reported on Form 417,118$677.5K2025-10-28
2025-10-28S, sale reported on Form 431,392$1.2M2025-10-28

Artiva Biotherapeutics, Inc. (ARTV)

Director, 10% owner · 1 filing · 1 purchase or sale
Trade dateCodeSharesValue as filedFiled
2026-05-11P, purchase reported on Form 46,510,416$75.0M2026-05-13

Climb Bio, Inc. (CLYM)

Director, 10% owner · 1 filing · 0 purchases and sales

No purchase or sale of common stock reported here; these filings cover grants, option exercises or other codes.

Parabilis Medicines, Inc. (PBLS)

Director, 10% owner · 1 filing · 2 purchases and sales
Trade dateCodeSharesValue as filedFiled
2026-06-11P, purchase reported on Form 419,728,353$394.6M2026-06-15
2026-06-11P, purchase reported on Form 41,460,397$29.2M2026-06-15
Source

Counted from the Form 4 filings this reporting owner (SEC CIK 1883840) filed on EDGAR. Values are the transaction values as filed. See every filing on EDGAR, or browse insider buying and today's insider purchases.

Source: U.S. Securities and Exchange Commission (EDGAR) and other official government data · Updated 2026-10-12 · For informational purposes only, not investment advice.
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