Atlas Venture Fund X, L.P. has filed 56 insider transactions across 3 companies since December 2022.
Most recent transaction: a transaction of 116693 shares of Generation Bio Co. ($GBIO) on February 09, 2026.
Activity breakdown: 0 open-market purchases and 51 sales.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feb. 9, 2026 | Generation Bio Co. | $GBIO | Atlas Venture Fund X, L.P. | Not found | U | Common Stock | 116693 | $0.00 | 0.0000 | 6,735,454 | 100.00% | 1.73% |
| Feb. 9, 2026 | Generation Bio Co. | $GBIO | Atlas Venture Fund X, L.P. | Not found | U | Common Stock | 60 | $0.00 | 0.0000 | 6,735,454 | 100.00% | 0.00% |
| Feb. 9, 2026 | Generation Bio Co. | $GBIO | Atlas Venture Fund X, L.P. | Not found | U | Common Stock | 711193 | $0.00 | 0.0000 | 6,735,454 | 100.00% | 10.56% |
| March 11, 2024 | Kymera Therapeutics, Inc. | $KYMR | Atlas Venture Fund X, L.P. | Not found | S | Common Stock | 7837 | $42.77 | 5,558,386.0000 | 58,365,499 | 0.14% | 0.01% |
| March 11, 2024 | Kymera Therapeutics, Inc. | $KYMR | Atlas Venture Fund X, L.P. | Not found | S | Common Stock | 1045 | $43.42 | 5,557,341.0000 | 58,365,499 | 0.02% | 0.00% |
| March 12, 2024 | Kymera Therapeutics, Inc. | $KYMR | Atlas Venture Fund X, L.P. | Not found | S | Common Stock | 126066 | $41.94 | 5,628,576.0000 | 58,365,499 | 2.19% | 0.22% |
| March 12, 2024 | Kymera Therapeutics, Inc. | $KYMR | Atlas Venture Fund X, L.P. | Not found | S | Common Stock | 8581 | $42.52 | 5,619,995.0000 | 58,365,499 | 0.15% | 0.01% |
| March 12, 2024 | Kymera Therapeutics, Inc. | $KYMR | Atlas Venture Fund X, L.P. | Not found | S | Common Stock | 26452 | $41.94 | 5,530,889.0000 | 58,365,499 | 0.48% | 0.05% |
| March 12, 2024 | Kymera Therapeutics, Inc. | $KYMR | Atlas Venture Fund X, L.P. | Not found | S | Common Stock | 1819 | $42.52 | 5,529,070.0000 | 58,365,499 | 0.03% | 0.00% |
| March 13, 2024 | Kymera Therapeutics, Inc. | $KYMR | Atlas Venture Fund X, L.P. | Not found | S | Common Stock | 108404 | $42.19 | 5,511,591.0000 | 58,365,499 | 1.93% | 0.19% |
| March 13, 2024 | Kymera Therapeutics, Inc. | $KYMR | Atlas Venture Fund X, L.P. | Not found | S | Common Stock | 6686 | $42.84 | 5,504,905.0000 | 58,365,499 | 0.12% | 0.01% |
| March 13, 2024 | Kymera Therapeutics, Inc. | $KYMR | Atlas Venture Fund X, L.P. | Not found | S | Common Stock | 1386 | $42.84 | 5,504,905.0000 | 58,365,499 | 0.03% | 0.00% |
| March 13, 2024 | Kymera Therapeutics, Inc. | $KYMR | Atlas Venture Fund X, L.P. | Not found | S | Common Stock | 22779 | $42.19 | 5,506,291.0000 | 58,365,499 | 0.41% | 0.04% |
| March 11, 2024 | Kymera Therapeutics, Inc. | $KYMR | Atlas Venture Fund X, L.P. | Not found | S | Common Stock | 37180 | $42.77 | 5,759,764.0000 | 58,365,499 | 0.64% | 0.06% |
| March 11, 2024 | Kymera Therapeutics, Inc. | $KYMR | Atlas Venture Fund X, L.P. | Not found | S | Common Stock | 5122 | $43.42 | 5,754,642.0000 | 58,365,499 | 0.09% | 0.01% |
| Jan. 23, 2024 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 47500 | $67.65 | 1,600,512.0000 | 0 | 2.88% | 0.00% |
| Jan. 23, 2024 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 20000 | $67.65 | 1,600,512.0000 | 0 | 1.23% | 0.00% |
| Jan. 23, 2024 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 82500 | $67.65 | 2,105,846.0000 | 0 | 3.77% | 0.00% |
| Jan. 10, 2024 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 30000 | $64.00 | 2,235,846.0000 | 0 | 1.32% | 0.00% |
| Jan. 10, 2024 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 20000 | $64.00 | 2,235,846.0000 | 0 | 0.89% | 0.00% |
| Dec. 14, 2023 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 20429 | $58.27 | 2,285,966.0000 | 0 | 0.89% | 0.00% |
| Dec. 14, 2023 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 180 | $59.74 | 2,285,846.0000 | 0 | 0.01% | 0.00% |
| Dec. 12, 2023 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 31235 | $59.87 | 2,368,710.0000 | 0 | 1.30% | 0.00% |
| Dec. 12, 2023 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 20823 | $59.87 | 2,341,087.0000 | 0 | 0.88% | 0.00% |
| Dec. 12, 2023 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 632 | $60.99 | 2,368,078.0000 | 0 | 0.03% | 0.00% |
| Dec. 12, 2023 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 422 | $60.99 | 2,340,665.0000 | 0 | 0.02% | 0.00% |
| Dec. 12, 2023 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 6234 | $62.42 | 2,361,844.0000 | 0 | 0.26% | 0.00% |
| Dec. 12, 2023 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 4155 | $62.42 | 2,336,510.0000 | 0 | 0.18% | 0.00% |
| Dec. 12, 2023 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 994 | $62.90 | 2,360,850.0000 | 0 | 0.04% | 0.00% |
| Dec. 12, 2023 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 665 | $62.90 | 2,335,845.0000 | 0 | 0.03% | 0.00% |
| Dec. 12, 2023 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 1031 | $63.78 | 2,359,819.0000 | 0 | 0.04% | 0.00% |
| Dec. 12, 2023 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 688 | $63.78 | 2,335,157.0000 | 0 | 0.03% | 0.00% |
| Dec. 12, 2023 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 27924 | $65.10 | 2,331,895.0000 | 0 | 1.18% | 0.00% |
| Dec. 12, 2023 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 18615 | $65.10 | 2,316,542.0000 | 0 | 0.80% | 0.00% |
| Dec. 12, 2023 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 9901 | $65.77 | 2,321,994.0000 | 0 | 0.42% | 0.00% |
| Dec. 12, 2023 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 6599 | $65.77 | 2,309,943.0000 | 0 | 0.28% | 0.00% |
| Dec. 13, 2023 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 5263 | $59.99 | 2,316,731.0000 | 0 | 0.23% | 0.00% |
| Dec. 13, 2023 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 3508 | $59.99 | 2,306,435.0000 | 0 | 0.15% | 0.00% |
| Dec. 13, 2023 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 60 | $60.50 | 2,316,671.0000 | 0 | 0.00% | 0.00% |
| Dec. 13, 2023 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 40 | $60.50 | 2,306,395.0000 | 0 | 0.00% | 0.00% |
| Dec. 14, 2023 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 30645 | $58.27 | 2,286,026.0000 | 0 | 1.32% | 0.00% |
| Dec. 14, 2023 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 120 | $59.74 | 2,285,846.0000 | 0 | 0.01% | 0.00% |
| Sept. 15, 2023 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 260894 | $53.16 | 1,595,900.0000 | 0 | 14.05% | 0.00% |
| Sept. 16, 2023 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 2115 | $53.22 | 1,593,785.0000 | 0 | 0.13% | 0.00% |
| Sept. 14, 2023 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 94440 | $53.05 | 1,856,794.0000 | 0 | 4.84% | 0.00% |
| Aug. 14, 2023 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 2000 | $54.80 | 2,944,527.0000 | 0 | 0.07% | 0.00% |
| Aug. 15, 2023 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 72931 | $52.40 | 2,833,458.0000 | 0 | 2.51% | 0.00% |
| Aug. 15, 2023 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 111069 | $52.40 | 2,833,458.0000 | 0 | 3.77% | 0.00% |
| Aug. 14, 2023 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 75000 | $52.00 | 3,044,527.0000 | 0 | 2.40% | 0.00% |
| Aug. 14, 2023 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 98000 | $53.00 | 2,946,527.0000 | 0 | 3.22% | 0.00% |
| Jan. 12, 2023 | Kymera Therapeutics, Inc. | $KYMR | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 21592 | $30.29 | 5,858,262.0000 | 53,933,229 | 0.37% | 0.04% |
| Jan. 11, 2023 | Kymera Therapeutics, Inc. | $KYMR | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 6071 | $29.96 | 5,879,854.0000 | 53,933,229 | 0.10% | 0.01% |
| Jan. 11, 2023 | Kymera Therapeutics, Inc. | $KYMR | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 21683 | $29.96 | 5,935,390.0000 | 53,933,229 | 0.36% | 0.04% |
| Jan. 12, 2023 | Kymera Therapeutics, Inc. | $KYMR | Atlas Venture Fund X, L.P. | TenPercentOwner | S | Common Stock | 77128 | $30.29 | 5,858,262.0000 | 53,933,229 | 1.30% | 0.14% |
| Dec. 29, 2022 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | J | Common Stock | 1835799 | $0.00 | 3,192,459.0000 | 0 | 135.32% | 0.00% |
| Dec. 29, 2022 | Disc Medicine, Inc. | $IRON | Atlas Venture Fund X, L.P. | TenPercentOwner | J | Common Stock | 882224 | $0.00 | 3,192,459.0000 | 0 | 38.19% | 0.00% |