Third Rock Ventures V, L.P. insider trades

Third Rock Ventures V, L.P. has filed 4 Form 4s with the SEC that we hold, for Rapport Therapeutics, Inc. (RAPP) (10% owner) and Septerna, Inc. (SEPN) (10% owner). Across all of them we count 0 purchases worth $0 and 4 sales worth $13.5M reported on Form 4. In the last 12 months: 0 purchases ($0) and 4 sales ($13.5M). The largest single trade was a sale of 147,059 shares of Septerna, Inc. worth $7.4M, dated 2026-08-12. The first filing on our record is dated 2024-06-10 and the latest 2026-08-14.

Rapport Therapeutics, Inc. (RAPP)

10% owner · 3 filings · 2 purchases and sales

Trade date	Code	Shares	Value as filed	Filed	Source
2026-05-11	S, sale reported on Form 4	133,618	$5.4M	2026-05-13	SEC
2026-05-26	S, sale reported on Form 4	18,572	$743.8K	2026-05-28	SEC

Septerna, Inc. (SEPN)

10% owner · 1 filing · 2 purchases and sales

Trade date	Code	Shares	Value as filed	Filed	Source
2026-08-12	S, sale reported on Form 4	147,059	$7.4M	2026-08-14	SEC
2026-08-12	S, sale reported on Form 4	141	$7.2K	2026-08-14	SEC

Source

Counted from the Form 4 filings this reporting owner (SEC CIK 1778071) 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 2026-10-28 · For informational purposes only, not investment advice.
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