Atlas Venture Fund X, L.P.
10% Owner · 1 filing · Latest: Feb 9, 2026
Generation Bio Co.
| Ticker | Owner | Relationship | Date | Transaction | Cost | #Shares | Value ($) | #Shares Total | SEC Filing |
|---|---|---|---|---|---|---|---|---|---|
IRON | Atlas Venture Fund X, LP | — | Sep 4, 2026 | Proposed Sale | $79.37 | 2,212 | $175.6K | — | |
IRON | Atlas Venture Fund X, LP | — | Sep 3, 2026 | Proposed Sale | $80.05 | 6,822 | $546.1K | — | |
IRON | Atlas Venture Fund X, LP | — | Sep 2, 2026 | Proposed Sale | $78.67 | 64,460 | $5.1M | — | |
KYMR | Atlas Venture Fund X, LP | — | Jun 29, 2026 | Proposed Sale | $108.12 | 66,177 | $7.2M | — | |
KYMR | Atlas Venture Fund X, LP | — | Jun 26, 2026 | Proposed Sale | $116.46 | 410,427 | $47.8M | — | |
KYMR | Atlas Venture Fund X, LP | — | Jun 25, 2026 | Proposed Sale | $99.87 | 480,992 | $48.0M | — | |
KYMR | Atlas Venture Fund X, LP | — | Jun 24, 2026 | Proposed Sale | $98.25 | 118,178 | $11.6M | — | |
KYMR | Atlas Venture Fund X, LP | — | Jun 23, 2026 | Proposed Sale | $99.45 | 1,235 | $122.8K | — | |
KYMR | Atlas Venture Fund X, LP | — | Jun 22, 2026 | Proposed Sale | $90.43 | 243,976 | $22.1M | — | |
KYMR | Atlas Venture Fund X, LP | — | Jun 18, 2026 | Proposed Sale | $89.90 | 100,928 | $9.1M | — | |
KYMR | Atlas Venture Fund X, LP | — | Jun 17, 2026 | Proposed Sale | $87.44 | 92,169 | $8.1M | — | |
KYMR | Atlas Venture Fund X, LP | — | Apr 22, 2026 | Proposed Sale | $88.07 | 88 | $7.8K | — | |
KYMR | Atlas Venture Fund X, LP | — | Apr 15, 2026 | Proposed Sale | $89.87 | 2,750 | $247.1K | — | |
KYMR | Atlas Venture Fund X, LP | — | Mar 2, 2026 | Proposed Sale | $91.35 | 200,000 | $18.3M | — | |
IRON | Atlas Venture Fund X, LP | — | Dec 17, 2025 | Proposed Sale | $91.47 | 818 | $74.8K | — | |
IRON | Atlas Venture Fund X, LP | — | Dec 16, 2025 | Proposed Sale | $92.00 | 22,666 | $2.1M | — | |
IRON | Atlas Venture Fund X, L.P. | — | Dec 16, 2025 | Proposed Sale | $91.47 | 52,000 | $4.8M | — | |
IRON | Atlas Venture Fund X, L.P. | — | Dec 15, 2025 | Proposed Sale | $92.00 | 36,877 | $3.4M | — | |
IRON | Atlas Venture Fund X, LP | — | Dec 15, 2025 | Proposed Sale | $91.85 | 32,035 | $2.9M | — | |
IRON | Atlas Venture Fund X, LP | — | Dec 12, 2025 | Proposed Sale | $93.60 | 49,299 | $4.6M | — |
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