Summary
Updated Aug 31, 2026
Third Rock Ventures V, L.P. is 10% Owner of Septerna, Inc. (SEPN). 6 SEC Form 4 filings on record going back to 2024, most recently on 14 August 2026. Most recent open-market trade: sold $7K of SEPN on 14 August 2026. Lifetime open-market purchases: $11.70M. Lifetime open-market sales: $41.79M.
Recent Transactions
11Every recent SEC Form 4 transaction Third Rock Ventures V, L.P. has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Third Rock Ventures V, L.P. go back to 2024: 6 primary Form 4 filings, an average of 2.0 per year. The typical open-market purchase is $5.85M (2 buys totaling $11.70M). The largest single buy on record is $6.67M of SEPN in 2024. Sales side: 7 recorded sales totaling $41.79M, so the filing history runs sell-heavy by dollar value. 7 recorded transactions carry a Rule 10b5-1 flag, meaning they were pre-scheduled under a written trading plan rather than discretionary.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Third Rock Ventures V, L.P. files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- RA CAPITAL MANAGEMENT, L.P. - $63.45M of SEPN open-market activity in the last 12 months
- Samira Shaikhly - $2.80M of SEPN open-market activity in the last 12 months
- Elizabeth Bhatt - $1.45M of SEPN open-market activity in the last 12 months
- Daniel D. Long - $825K of SEPN open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
What is Third Rock Ventures V, L.P.?
Third Rock Ventures V, L.P. is an investment firm, tracked as 10% Owner of Septerna, Inc. (SEPN). InsiderAlpha holds 6 primary Form 4 filings for it, the earliest from 2024, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has Third Rock Ventures V, L.P. submitted recently?
1 primary Form 4 filing in the last 90 days, covering 1 company.
Has Third Rock Ventures V, L.P. been buying or selling stock?
Recorded transactions: 2 open-market purchases ($11.70M) and 7 open-market sales ($41.79M) across all tracked filings.
Where can I see all of Third Rock Ventures V, L.P.'s SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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