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

Last updated: 2026-03-14 10:38 UTC | Total transactions: 44

Atlas Venture Fund XI, L.P. has filed 44 insider transactions across 4 companies since January 2024.

Most recent transaction: a transaction of 2886293 shares of Sionna Therapeutics, Inc. ($SION) on February 10, 2025.

Activity breakdown: 1 open-market purchase and 35 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. 10, 2025 Sionna Therapeutics, Inc. $SION Atlas Venture Fund XI, L.P. Not found C Common Stock 2886293 $0.00 3,694,020.0000 0 357.34% 0.00%
Feb. 10, 2025 Sionna Therapeutics, Inc. $SION Atlas Venture Fund XI, L.P. Not found C Series C convertible preferred stock 1092504 $0.00 0.0000 0 100.00% 0.00%
Feb. 10, 2025 Sionna Therapeutics, Inc. $SION Atlas Venture Fund XI, L.P. Not found C Series C convertible preferred stock 61463 $0.00 0.0000 0 100.00% 0.00%
Feb. 10, 2025 Sionna Therapeutics, Inc. $SION Atlas Venture Fund XI, L.P. Not found C Series B convertible preferred stock 1298332 $0.00 0.0000 0 100.00% 0.00%
Feb. 10, 2025 Sionna Therapeutics, Inc. $SION Atlas Venture Fund XI, L.P. Not found C Series A convertible preferred stock 1806317 $0.00 0.0000 0 100.00% 0.00%
Feb. 10, 2025 Sionna Therapeutics, Inc. $SION Atlas Venture Fund XI, L.P. Not found C Series Seed convertible preferred stock 1051051 $0.00 0.0000 0 100.00% 0.00%
Feb. 10, 2025 Sionna Therapeutics, Inc. $SION Atlas Venture Fund XI, L.P. Not found P Common Stock 60000 $18.00 3,694,020.0000 0 1.65% 0.00%
Feb. 10, 2025 Sionna Therapeutics, Inc. $SION Atlas Venture Fund XI, L.P. Not found C Common Stock 747727 $0.00 3,634,020.0000 0 25.91% 0.00%
Nov. 1, 2024 Third Harmonic Bio, Inc. $THRD Atlas Venture Fund XI, L.P. Not found J Common Stock 515688 $0.00 9,798,075.0000 0 5.00% 0.00%
Feb. 27, 2024 Dyne Therapeutics, Inc. $DYN Atlas Venture Fund XI, L.P. Not found S Common Stock 3821 $24.68 7,209,144.0000 0 0.05% 0.00%
Feb. 26, 2024 Dyne Therapeutics, Inc. $DYN Atlas Venture Fund XI, L.P. Not found S Common Stock 136312 $23.59 7,080,737.0000 0 1.89% 0.00%
Feb. 27, 2024 Dyne Therapeutics, Inc. $DYN Atlas Venture Fund XI, L.P. Not found S Common Stock 2216 $24.68 6,575,897.0000 0 0.03% 0.00%
Feb. 28, 2024 Dyne Therapeutics, Inc. $DYN Atlas Venture Fund XI, L.P. Not found S Common Stock 152244 $24.83 6,565,008.0000 0 2.27% 0.00%
Feb. 28, 2024 Dyne Therapeutics, Inc. $DYN Atlas Venture Fund XI, L.P. Not found S Common Stock 2430 $25.25 6,562,578.0000 0 0.04% 0.00%
Feb. 28, 2024 Dyne Therapeutics, Inc. $DYN Atlas Venture Fund XI, L.P. Not found S Common Stock 22567 $24.83 7,186,577.0000 0 0.31% 0.00%
Feb. 28, 2024 Dyne Therapeutics, Inc. $DYN Atlas Venture Fund XI, L.P. Not found S Common Stock 360 $25.25 7,186,217.0000 0 0.01% 0.00%
Feb. 28, 2024 Dyne Therapeutics, Inc. $DYN Atlas Venture Fund XI, L.P. Not found S Common Stock 13109 $24.83 6,562,788.0000 0 0.20% 0.00%
Feb. 28, 2024 Dyne Therapeutics, Inc. $DYN Atlas Venture Fund XI, L.P. Not found S Common Stock 210 $25.25 6,562,578.0000 0 0.00% 0.00%
Feb. 27, 2024 Dyne Therapeutics, Inc. $DYN Atlas Venture Fund XI, L.P. Not found S Common Stock 23505 $24.38 6,578,113.0000 0 0.36% 0.00%
Feb. 26, 2024 Dyne Therapeutics, Inc. $DYN Atlas Venture Fund XI, L.P. Not found S Common Stock 64783 $23.98 7,015,954.0000 0 0.91% 0.00%
Feb. 26, 2024 Dyne Therapeutics, Inc. $DYN Atlas Venture Fund XI, L.P. Not found S Common Stock 20205 $23.59 7,263,023.0000 0 0.28% 0.00%
Feb. 26, 2024 Dyne Therapeutics, Inc. $DYN Atlas Venture Fund XI, L.P. Not found S Common Stock 9603 $23.98 7,253,420.0000 0 0.13% 0.00%
Feb. 26, 2024 Dyne Therapeutics, Inc. $DYN Atlas Venture Fund XI, L.P. Not found S Common Stock 11736 $23.59 6,607,198.0000 0 0.18% 0.00%
Feb. 26, 2024 Dyne Therapeutics, Inc. $DYN Atlas Venture Fund XI, L.P. Not found S Common Stock 5580 $23.98 6,601,618.0000 0 0.08% 0.00%
Feb. 27, 2024 Dyne Therapeutics, Inc. $DYN Atlas Venture Fund XI, L.P. Not found S Common Stock 272923 $24.38 6,743,031.0000 0 3.89% 0.00%
Feb. 27, 2024 Dyne Therapeutics, Inc. $DYN Atlas Venture Fund XI, L.P. Not found S Common Stock 25779 $24.68 6,717,252.0000 0 0.38% 0.00%
Feb. 27, 2024 Dyne Therapeutics, Inc. $DYN Atlas Venture Fund XI, L.P. Not found S Common Stock 40455 $24.38 7,212,965.0000 0 0.56% 0.00%
Feb. 21, 2024 Dyne Therapeutics, Inc. $DYN Atlas Venture Fund XI, L.P. Not found S Common Stock 149337 $22.44 7,587,471.0000 0 1.93% 0.00%
Feb. 23, 2024 Dyne Therapeutics, Inc. $DYN Atlas Venture Fund XI, L.P. Not found S Common Stock 13738 $22.70 7,273,405.0000 0 0.19% 0.00%
Feb. 23, 2024 Dyne Therapeutics, Inc. $DYN Atlas Venture Fund XI, L.P. Not found S Common Stock 23648 $22.70 7,937,699.0000 0 0.30% 0.00%
Feb. 23, 2024 Dyne Therapeutics, Inc. $DYN Atlas Venture Fund XI, L.P. Not found S Common Stock 159542 $22.70 7,273,405.0000 0 2.15% 0.00%
Feb. 22, 2024 Dyne Therapeutics, Inc. $DYN Atlas Venture Fund XI, L.P. Not found S Common Stock 119360 $22.66 7,432,947.0000 0 1.58% 0.00%
Feb. 21, 2024 Dyne Therapeutics, Inc. $DYN Atlas Venture Fund XI, L.P. Not found S Common Stock 35164 $23.14 7,552,307.0000 0 0.46% 0.00%
Feb. 20, 2024 Dyne Therapeutics, Inc. $DYN Atlas Venture Fund XI, L.P. Not found S Common Stock 166029 $22.71 6,819,475.0000 0 2.38% 0.00%
Feb. 15, 2024 Dyne Therapeutics, Inc. $DYN Atlas Venture Fund XI, L.P. Not found S Common Stock 2113 $24.45 7,148,211.0000 0 0.03% 0.00%
Feb. 15, 2024 Dyne Therapeutics, Inc. $DYN Atlas Venture Fund XI, L.P. Not found S Common Stock 175793 $23.88 7,150,324.0000 0 2.40% 0.00%
Feb. 16, 2024 Dyne Therapeutics, Inc. $DYN Atlas Venture Fund XI, L.P. Not found S Common Stock 162707 $23.14 6,985,504.0000 0 2.28% 0.00%
Feb. 20, 2024 Dyne Therapeutics, Inc. $DYN Atlas Venture Fund XI, L.P. Not found S Common Stock 3510 $23.40 6,815,965.0000 0 0.05% 0.00%
Feb. 8, 2024 Xilio Therapeutics, Inc. $XLO Atlas Venture Fund XI, L.P. TenPercentOwner S Common Stock 267 $0.64 2,754,109.0000 0 0.01% 0.00%
Feb. 8, 2024 Xilio Therapeutics, Inc. $XLO Atlas Venture Fund XI, L.P. TenPercentOwner S Common Stock 733 $0.64 2,754,109.0000 0 0.03% 0.00%
Jan. 11, 2024 Xilio Therapeutics, Inc. $XLO Atlas Venture Fund XI, L.P. TenPercentOwner S Common Stock 1566 $0.87 2,756,649.0000 0 0.06% 0.00%
Jan. 12, 2024 Xilio Therapeutics, Inc. $XLO Atlas Venture Fund XI, L.P. TenPercentOwner S Common Stock 1540 $0.83 2,755,109.0000 0 0.06% 0.00%
Jan. 12, 2024 Xilio Therapeutics, Inc. $XLO Atlas Venture Fund XI, L.P. TenPercentOwner S Common Stock 560 $0.83 2,755,109.0000 0 0.02% 0.00%
Jan. 11, 2024 Xilio Therapeutics, Inc. $XLO Atlas Venture Fund XI, L.P. TenPercentOwner S Common Stock 569 $0.87 2,755,669.0000 0 0.02% 0.00%