Third Rock Ventures IV, L.P.
Ten-percent owner · MAZE, TNGX
As of 2026-09-27, Third Rock Ventures IV, L.P. has 35 Form 4 transactions on record across 2 companies — 8 in the trailing 12 months.
Everything this person has disclosed to the SEC on Form 4 — across every company they file for — reconstructed from the public record. A filing history, not a tip sheet.
Pattern in the record: open-market sales filed in September in multiple years since 2024 — a recurring calendar cadence, more consistent with scheduled activity than a one-off decision.
Reconstructed holdings
Reconstructed from this person's own Form 4 filings — the total each filing reported owning afterward, priced at the close on the as-of date shown. A filed position can lag the real one.
Direct and indirect holdings (e.g. through a trust or fund) are tagged separately, as filed.
Trades by company
Filing ledger
| Date | Company | Action | Shares @ price | Value | Ownership Δ | Owned after | Filing |
|---|---|---|---|---|---|---|---|
| 2025-10-23 | TNGX | Sale | 477,401 @ $10.15 | $4.8M | −3.4% of holding | 13,386,574 | Form 4 |
| 2025-09-16 | TNGX | Sale | 363,541 @ $7.04 | $2.6M | −2.5% of holding | 14,363,975 | Form 4 |
| 2025-09-08 | TNGX | Sale | 86,459 @ $7.04 | $609K | −0.6% of holding | 14,727,516 | Form 4 |
| 2025-09-05 | TNGX | Sale | 642,906 @ $7.00 | $4.5M | −4.2% of holding | 14,813,975 | Form 4 |
| 2025-08-22 | TNGX | Sale | 302,194 @ $7.00 | $2.1M | −1.9% of holding | 15,456,881 | Form 4 |
| 2025-08-19 | TNGX | Sale | 1,100,000 @ $7.01 | $7.7M | −6.5% of holding | 15,759,075 | Form 4 |
| 2024-09-13 | TNGX | Sale | 67,400 @ $10.53 | $710K | −0.4% of holding | 16,859,075 | Form 4 |
| 2024-09-05 | TNGX | Sale | 75,000 @ $11.56 | $867K | −0.4% of holding | 16,926,475 | Form 4 |
| 2024-08-30 | TNGX | Sale | 175,000 @ $11.60 | $2.0M | −1.0% of holding | 17,001,475 | Form 4 |
| 2024-08-27 | TNGX | Sale | 25,000 @ $11.55 | $289K | −0.1% of holding | 17,176,475 | Form 4 |
| 2024-08-19 | TNGX | Sale | 150,000 @ $10.09 | $1.5M | −0.9% of holding | 17,201,475 | Form 4 |
| 2024-08-16 | TNGX | Sale | 135,000 @ $9.79 | $1.3M | −0.8% of holding | 17,351,475 | Form 4 |
| 2024-08-01 | TNGX | Sale | 40,000 @ $9.80 | $392K | −0.2% of holding | 17,486,475 | Form 4 |
| 2024-07-31 | TNGX | Sale | 100,000 @ $9.93 | $993K | −0.6% of holding | 17,526,475 | Form 4 |
| 2024-07-30 | TNGX | Sale | 95,000 @ $9.80 | $931K | −0.5% of holding | 17,626,475 | Form 4 |
| 2024-07-26 | TNGX | Sale | 50,000 @ $9.84 | $492K | −0.3% of holding | 17,721,475 | Form 4 |
| 2024-07-25 | TNGX | Sale | 100,599 @ $9.87 | $993K | −0.6% of holding | 17,771,475 | Form 4 |
| 2024-07-24 | TNGX | Sale | 200,000 @ $9.82 | $2.0M | −1.1% of holding | 17,872,074 | Form 4 |
| 2024-07-23 | TNGX | Sale | 125,000 @ $9.79 | $1.2M | −0.7% of holding | 18,072,074 | Form 4 |
| 2024-07-22 | TNGX | Sale | 262,740 @ $9.78 | $2.6M | −1.4% of holding | 18,197,074 | Form 4 |
| 2024-07-18 | TNGX | Sale | 191,490 @ $9.81 | $1.9M | −1.0% of holding | 18,459,814 | Form 4 |
| 2024-07-17 | TNGX | Sale | 550,171 @ $9.79 | $5.4M | −2.9% of holding | 18,651,304 | Form 4 |
| 2024-02-20 | TNGX | Sale | 162,500 @ $12.00 | $1.9M | −0.8% of holding | 19,201,475 | Form 4 |
12 award / exercise / gift records — not counted as purchases
| Date | Company | Action | Shares | Owned after | Filing |
|---|---|---|---|---|---|
| 2025-11-04 | MAZE | Other acquisition | 1,600,000 | 4,473,958 | Form 4 |
| 2025-11-04 | MAZE | Other acquisition | 1,600,000 | 4,473,958 | Form 4 |
| 2025-11-04 | MAZE | Other acquisition | 1,600,000 | 4,473,958 | Form 4 |
| 2025-11-04 | MAZE | Other acquisition | 1,600,000 | 4,473,958 | Form 4 |
| 2025-11-04 | MAZE | Other acquisition | 1,600,000 | 4,473,958 | Form 4 |
| 2025-11-04 | MAZE | Other acquisition | 1,600,000 | 4,473,958 | Form 4 |
| 2025-11-04 | MAZE | Other acquisition | 1,600,000 | 4,473,958 | Form 4 |
| 2025-02-03 | MAZE | Conversion | 5,762,788 | 6,073,958 | Form 4 |
| 2025-02-03 | MAZE | Conversion | 950,800 | 950,800 | Form 4 |
| 2025-02-03 | MAZE | Conversion | 45,833,334 | 0 | Form 4 |
| 2025-02-03 | MAZE | Conversion | 9,725,709 | 0 | Form 4 |
| 2025-02-03 | MAZE | Conversion | 9,166,666 | 0 | Form 4 |
Source: SEC Form 4 filings. Each row links to its original filing.
Research tool, not investment advice — historical frequencies, not recommendations. A product of Marovel Technologies LLC. Full terms.