| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
10% Owner
7 companies
Atlas Venture Fund X, L.P. is 10% Owner at TECX, with reported holdings spanning 7 companies.
Our model assigns Atlas Venture Fund X, L.P. a middling insider score of 69/100, based on 22 past trades. Over a 12-month horizon, 86.4% of those trades were profitable, with an average 12-month return of +20.3%.
Atlas Venture Fund X, L.P.'s largest disclosed position is in DNTH as 10% Owner, worth about $260.4M. The DNTH filings lean toward selling, a net 14,245 shares.
Atlas Venture Fund X, L.P. has 31 Form 4 filings on record from June 2018 to February 2026, across 7 companies: 10% Owner at Generation Bio (GBIO), 2020–2026; 10% Owner at Kymera Therapeutics (KYMR), 2020–2024; 10% Owner at Disc Medicine (IRON), 2022–2024, and 4 more.
The 109 reported transactions were 76 open-market sales, 17 other transactions, 12 conversions and 3 tenders, plus smaller numbers of other types.
Counted by filing, the open-market trades come to 1 purchase worth about $15.0M and 11 sales worth about $109.2M.
The only open-market purchase was 810,811 shares of TECX at an average $18.50 on July 19, 2019, about $15.0M.
The largest open-market sale was 357,449 shares of IRON at an average $53.13 on September 16, 2023, about $19.0M. Twelve months later IRON was down 10%.
1 of the 6 sales since April 2023 was made under a Rule 10b5-1 trading plan; the other 5 were not.
| Date | Ticker | Role | Type | Shares | Price | Value | Chg% | 3M | 12M | SEC |
|---|---|---|---|---|---|---|---|---|---|---|
| Mar 13, 2024 | KYMR Kymera Therapeutics, Inc. | 10% Owner | Sell10b5-1 | 353,357 | $42.20 | $14,912,376.40 | -29.9% | -18.3% | -20.9% | |
| Jan 23, 2024 | IRON Disc Medicine, Inc. | 10% Owner | Sell | 150,000 | $67.65 | $10,147,500.00 | -43.1% | -59.1% | -11.3% | |
| Jan 10, 2024 | IRON Disc Medicine, Inc. | 10% Owner | Sell | 50,000 | $64.00 | $3,200,000.00 | -6.0% | -49.8% | -7.3% | |
| Dec 14, 2023 | IRON Disc Medicine, Inc. | 10% Owner | Sell | 190,163 | $61.45 | $11,684,586.39 | -19.1% | +12.4% | +11.4% | |
| Sep 16, 2023 | IRON Disc Medicine, Inc. | 10% Owner | Sell | 357,449 | $53.13 | $18,991,727.34 | -18.3% | +10.8% | -10.0% | |
| Aug 15, 2023 | IRON Disc Medicine, Inc. | 10% Owner | Sell | 359,000 | $52.49 | $18,845,200.00 | -28.9% | -8.4% | -16.3% | |
| Jan 12, 2023 | KYMR Kymera Therapeutics, Inc. | 10% Owner | Sell | 126,474 | $30.22 | $3,821,738.64 | -12.4% | -5.7% | -16.3% | |
| Dec 15, 2022 | KYMR Kymera Therapeutics, Inc. | 10% Owner | Sell | 382,244 | $31.36 | $11,985,953.69 | -29.4% | +11.6% | -6.5% | |
| Nov 3, 2022 | KYMR Kymera Therapeutics, Inc. | 10% Owner | Sell | 220,016 | $30.01 | $6,602,952.38 | -18.0% | +18.3% | -53.8% | |
| Nov 1, 2022 | KYMR Kymera Therapeutics, Inc. | 10% Owner | Sell | 288,702 | $30.26 | $8,735,143.37 | -21.6% | +21.4% | -61.4% |