SEC Insider Transactions from Atlas Venture Fund X, L.P..

Last updated: 2026-03-14 11:48 UTC | Total transactions: 56

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.

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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%