Third Rock Ventures IV, L.P.
CIK 1688327 · last filed 2025-09-17
"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.
Charts
Trading activity, where the exposure sits, and each trade against the stock price.
RLAY price and trades
Daily close with each Form 4 filing on this company marked: green = open-market buy, red = open-market sale, purple = grants, exercises, gifts and other non-market transactions. Marker size scales with the dollar value.
Shares held
Shares owned after each reported transaction on this company (direct holdings as reported).
Open-market buying and selling
by monthDollar value of open-market purchases (code P, up) and sales (code S, down) across all companies, by filing month. Grants, exercises and gifts are excluded.
Exposure by company
latestMost recently reported shares × current price. Faded bars (*) have had no filing in 3 years, so the person may no longer hold them. Click a bar to chart that company.
Filer Profile
BOSTON, MA 02215
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| TNGX | 10%+ Owner | 14,363,975 | $23.89 | $343.16M | -$58.00M | 7 | 2025-09-17 |
| RLAY | 10%+ Owner | 9,767,382 | $17.70 | $172.83M | -$2.04B | 1 | 2021-01-14 |
| RVMD | 10%+ Owner | 1,419,900 | $192.16 | $272.85M | $0 | 1 | 2020-02-18 |
| FULC | 10%+ Owner | 2,343,154 | $3.73 | $8.75M | $3.90M | 1 | 2019-07-22 |
| Dianthus Therapeutics, Inc. /DE/ (MGTA) Delisted | 10%+ Owner | 500,513 | $11.19 | $5.60M | $0 | 1 | 2018-06-27 |
Recent Filings · Page 2 of 4
35 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2024-08-30 | TNGX | Notice (144) | −175,000 | -$2.07M | EDGAR |
| 2024-08-27 | TNGX | Notice (144) | −25,000 | -$285.0K | EDGAR |
| 2024-08-20 | TNGX | Sell (S) | −855,000 | -$8.51M | EDGAR |
| 2024-08-19 | TNGX | Notice (144) | −150,000 | -$1.60M | EDGAR |
| 2024-08-16 | TNGX | Notice (144) | −135,000 | -$1.34M | EDGAR |
| 2024-08-01 | TNGX | Notice (144) | −40,000 | -$378.0K | EDGAR |
| 2024-08-01 | TNGX | Sell (S) | −705,000 | -$6.95M | EDGAR |
| 2024-07-31 | TNGX | Notice (144) | −100,000 | -$985.0K | EDGAR |
| 2024-07-30 | TNGX | Notice (144) | −95,000 | -$921.5K | EDGAR |
| 2024-07-30 | TNGX | Sell (S) | −150,000 | -$1.48M | EDGAR |
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.