Third Rock Ventures IV, L.P.
CIK 1688327 · last filed 2025-09-17
Third Rock Ventures IV, L.P. is a corporate insider who has filed 11 SEC Form 4 insider transactions across 5 companies since 2018. The most recent filing shows the insider sold $7.7M of TNGX on Sep 17, 2025. Across all open-market trades the lifetime net is −$2.10B, making them a net seller over the disclosed history. Current disclosed insider exposure totals $815.6M across reported positions.
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
$815.64M
5
11
-$2.10B
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| TNGX | 10%+ Owner | 14,363,975 | $30.94 | $444.42M | -$58.00M | 7 | 2025-09-17 |
| RLAY | 10%+ Owner | 9,767,382 | $14.81 | $144.65M | -$2.04B | 1 | 2021-01-14 |
| RVMD | 10%+ Owner | 1,419,900 | $153.87 | $218.48M | $0 | 1 | 2020-02-18 |
| FULC | 10%+ Owner | 2,343,154 | $3.45 | $8.08M | $3.90M | 1 | 2019-07-22 |
| Dianthus Therapeutics, Inc. /DE/ (MGTA) Delisted | 10%+ Owner | 8,008,204 | $11.19 | $89.64M | $0 | 1 | 2018-06-27 |
Recent Filings
11 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2025-09-17 | TNGX | Sell (S) | −1,090,623 | -$7.68M | EDGAR |
| 2024-08-20 | TNGX | Sell (S) | −855,000 | -$8.51M | EDGAR |
| 2024-08-01 | TNGX | Sell (S) | −705,000 | -$6.95M | EDGAR |
| 2024-07-30 | TNGX | Sell (S) | −150,000 | -$1.48M | EDGAR |
| 2024-07-24 | TNGX | Sell (S) | −1,163,220 | -$11.38M | EDGAR |
| 2024-07-18 | TNGX | Sell (S) | −1,650,513 | -$16.16M | EDGAR |
| 2024-02-21 | TNGX | Sell (S) | −487,500 | -$5.85M | EDGAR |
| 2021-01-14 | RLAY | Sell (S) | −50,601,546 | -$2.04B | EDGAR |
| 2020-02-18 | RVMD | Conv (C) | +4,259,700 | $0 | EDGAR |
| 2019-07-22 | FULC | Mixed | +7,029,462 | $3.90M | EDGAR |