Insider profile
Third Rock Ventures IV, L.P. Insider Trading
This page tracks every SEC Form 4 filing since April 2023 by Third Rock Ventures IV, L.P.: 30 transactions in total, none of them an open-market purchase, and 24 sales. Each record is parsed directly from the original filing, with amendments reconciled so a corrected filing never double-counts.
- CIK
- 0001688327
- Companies traded
- 1
- Total filings
- 30
- First filing
- 2024-02-20
- Last filing
- 2025-11-04
Files as Third Rock Ventures IV, L.P. · SEC EDGAR ↗
Activity summary
The most recent open-market decision was a sale of 477,401 shares ($4.8M) on October 23, 2025.
Three year balance
Buy and sell value by quarter, Q1 24 to Q4 25. Third Rock Ventures IV, L.P. has been a net seller across the period shown.
Bars below the rule are sales, above are purchases. Largest quarter on the chart is $23.6M.
Insider insight
Third Rock Ventures IV, L.P. trades most actively in TNGX, accounting for 24 of the 30 filings on record.
Track record
Most active in
Transaction History
Sourced from SEC EDGAR Form 4 filings. Updated hourly.
| Date | Insider | Company | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Nov 4, 2025 | Third Rock Ventures IV, L.P. | MAZE | J | 1,600,000 | — | — |
| Oct 23, 2025 | Third Rock Ventures IV, L.P. | TNGX | Sale | 477,401 | $10.15 | $4.85M |
| Sep 25, 2025 | Third Rock Ventures IV, L.P. | TNGX | Sale | 500,000 | $8.02 | $4.01M |
| Sep 16, 2025 | Third Rock Ventures IV, L.P. | TNGX | Sale | 363,541 | $7.04 | $2.56M |
| Sep 8, 2025 | Third Rock Ventures IV, L.P. | TNGX | Sale | 86,459 | $7.04 | $609K |
25 more transactions hidden
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By number of filings.
Filing cadence
Filings per quarter, this window.
Busiest: Q3 24 (16 filings)
Quietest: Q2 24 (0 filings)
Reading an insider's Form 4 history
Corporate insiders (directors, officers, and holders of more than 10% of a company's stock) must report their trades to the SEC on Form 4 within two business days. Looking at one insider's filings over time shows whether they tend to buy on the open market (a discretionary use of their own money, generally the strongest signal), sell, or simply receive and exercise equity awards as compensation.
The track record above measures how this insider's past open-market purchases performed in the months after each filing. Trades made under a pre-scheduled Rule 10b5-1 plan are flagged because they carry no timing signal. To pull any insider's full history programmatically, see the insider trading API or our guide to reading Form 4 filings.