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 |
|---|---|---|---|---|---|---|---|---|---|
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 | — | |
KYMR | Atlas Venture Fund X, L.P. | — | Dec 12, 2025 | Proposed Sale | $89.68 | 570 | $51.1K | — | |
KYMR | Atlas Venture Fund X, L.P. | — | Dec 11, 2025 | Proposed Sale | $87.81 | 5,125 | $450.0K | — | |
KYMR | Atlas Venture Fund X, L.P. | — | Dec 10, 2025 | Proposed Sale | $89.89 | 193,040 | $17.4M | — | |
IRON | Atlas Venture Fund X, LP | — | Oct 17, 2025 | Proposed Sale | $74.36 | 50,000 | $3.7M | — | |
IRON | Atlas Venture Fund X, LP | — | Oct 16, 2025 | Proposed Sale | $76.98 | 1,425 | $109.7K | — | |
IRON | Atlas Venture Fund X, LP | — | Oct 15, 2025 | Proposed Sale | $73.00 | 22,160 | $1.6M | — | |
IRON | Atlas Venture Fund X, L.P. | — | Aug 22, 2025 | Proposed Sale | $59.75 | 4,080 | $243.8K | — | |
IRON | Atlas Venture Fund X, L.P. | — | Aug 14, 2025 | Proposed Sale | $61.10 | 12,862 | $785.9K | — | |
IRON | Atlas Venture Fund X, L.P. | — | Aug 13, 2025 | Proposed Sale | $59.03 | 44,520 | $2.6M | — | |
IRON | Atlas Venture Fund X, L.P. | — | Aug 5, 2025 | Proposed Sale | $59.79 | 705 | $42.2K | — | |
IRON | Atlas Venture Fund X, L.P. | — | Jul 30, 2025 | Proposed Sale | $59.80 | 15,146 | $905.7K | — |
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