Atlas Venture Associates Opportunity I, L.P. — SEC Form 4 filings
SEC reporting owner CIK 1780065. 10 Form 4 filings on record with FilingPulse; latest filed 2026-02-09.
Transaction summary — filings shown
Covers all 10 filings on record, filed 2024-01-12 to 2026-02-09. Counts and totals are arithmetic on values as filed — descriptive data, not a recommendation.
- Open-market purchases (code P, non-derivative): none reported.
- Open-market sales (code S, non-derivative): 49 legs across 8 filings — 1,913,753 shares, $60,629,147 total (shares × price as filed).
- Other reported legs (grants, option exercises, tax withholding, gifts, derivative-security transactions, …): 5.
- Largest priced transaction: sale of 272,923 shares @ $24.38 ($6,653,863) in Dyne Therapeutics, Inc., filed 2024-02-28.
By issuer — same filings
Open-market purchase/sale legs on non-derivative securities, grouped by issuer. Role is as filed on the newest filing for that issuer. Dollar totals cover priced legs only (shares × price as filed). Ordered by priced transaction value, largest first.
| Issuer | Role (as filed) | Filings | Purchases (P) | Sales (S) | Other legs |
|---|---|---|---|---|---|
| Dyne Therapeutics, Inc. (DYN) | 10% owner | 3 | — | 26 legs · 1,355,161 sh · $32,365,030 | — |
| Kymera Therapeutics, Inc. (KYMR) | 10% owner | 1 | — | 12 legs · 353,357 sh · $14,912,376 | — |
| Disc Medicine, Inc. (IRON) | 10% owner | 2 | — | 5 legs · 200,000 sh · $13,347,500 | — |
| Xilio Therapeutics, Inc. (XLO) | 10% owner | 2 | — | 6 legs · 5,235 sh · $4,240 | — |
| Generation Bio Co. (GBIO) | 10% owner | 1 | — | — | 3 |
| Vigil Neuroscience, Inc. (VIGL) | 10% owner | 1 | — | — | 2 |
Form 4 filings — Atlas Venture Associates Opportunity I, L.P.
| Filed | Form | Issuer | Reported transactions | Source |
|---|---|---|---|---|
| 2026-02-09 | 4 | Generation Bio Co. (GBIO) jointly with Atlas Venture Fund X, L.P., ATLAS VENTURE ASSOCIATES X, L.P., Atlas Venture Associates X, LLC, Atlas Venture Opportunity Fund I, L.P., Atlas Venture Associates Opportunity I, LLC | Code (U): 711,193 · Code (U): 116,693 · Code (U): 60 | EDGAR |
| 2025-08-07 | 4 | Vigil Neuroscience, Inc. (VIGL) jointly with Atlas Venture Fund XII, L.P., Atlas Venture Associates XII, L.P., Atlas Venture Associates XII, LLC, Atlas Venture Opportunity Fund I, L.P., Atlas Venture Associates Opportunity I, LLC | Disposition to issuer (D): 4,808,896 · Disposition to issuer (D): 1,027,978 | EDGAR |
| 2024-03-13 | 4 | Kymera Therapeutics, Inc. (KYMR) jointly with Atlas Venture Fund X, L.P., ATLAS VENTURE ASSOCIATES X, L.P., Atlas Venture Associates X, LLC, Atlas Venture Opportunity Fund I, L.P., Atlas Venture Associates Opportunity I, LLC | Sale (S): 37,180 @ $42.77 · Sale (S): 5,122 @ $43.42 · Sale (S): 7,837 @ $42.77 · Sale (S): 1,045 @ $43.42 · Sale (S): 126,066 @ $41.94 · Sale (S): 8,581 @ $42.52 · +6 more | EDGAR |
| 2024-03-05 | 4 | Dyne Therapeutics, Inc. (DYN) jointly with Atlas Venture Opportunity Fund I, L.P., Atlas Venture Associates Opportunity I, LLC, Atlas Venture Opportunity Fund II, L.P., Atlas Venture Associates Opportunity II, LP, Atlas Venture Associates Opportunity II, LLC | Sale (S): 29,435 @ $30.05 · Sale (S): 17,099 @ $30.05 | EDGAR |
| 2024-02-28 | 4 | Dyne Therapeutics, Inc. (DYN) jointly with Atlas Venture Fund XI, L.P., Atlas Venture Associates XI, L.P., Atlas Venture Associates XI, LLC, Atlas Venture Opportunity Fund I, L.P., Atlas Venture Associates Opportunity I, LLC, Atlas Venture Opportunity Fund II, L.P., Atlas Venture Associates Opportunity II, LP, Atlas Venture Associates Opportunity II, LLC | Sale (S): 136,312 @ $23.59 · Sale (S): 64,783 @ $23.98 · Sale (S): 20,205 @ $23.59 · Sale (S): 9,603 @ $23.98 · Sale (S): 11,736 @ $23.59 · Sale (S): 5,580 @ $23.98 · +12 more | EDGAR |
| 2024-02-23 | 4 | Dyne Therapeutics, Inc. (DYN) jointly with Atlas Venture Fund XI, L.P., Atlas Venture Associates XI, L.P., Atlas Venture Associates XI, LLC, Atlas Venture Opportunity Fund I, L.P., Atlas Venture Associates Opportunity I, LLC, Atlas Venture Opportunity Fund II, L.P., Atlas Venture Associates Opportunity II, LP, Atlas Venture Associates Opportunity II, LLC | Sale (S): 149,337 @ $22.44 · Sale (S): 35,164 @ $23.14 · Sale (S): 119,360 @ $22.66 · Sale (S): 159,542 @ $22.70 · Sale (S): 23,648 @ $22.70 · Sale (S): 13,738 @ $22.70 | EDGAR |
| 2024-02-09 | 4 | Xilio Therapeutics, Inc. (XLO) jointly with Atlas Venture Fund XI, L.P., Atlas Venture Associates XI, L.P., Atlas Venture Associates XI, LLC, Atlas Venture Opportunity Fund I, L.P., Atlas Venture Associates Opportunity I, LLC | Sale (S): 733 @ $0.64 · Sale (S): 267 @ $0.64 | EDGAR |
| 2024-01-25 | 4 | Disc Medicine, Inc. (IRON) jointly with Atlas Venture Fund X, L.P., ATLAS VENTURE ASSOCIATES X, L.P., Atlas Venture Associates X, LLC, Atlas Venture Opportunity Fund I, L.P., Atlas Venture Associates Opportunity I, LLC, Atlas Venture Opportunity Fund II, L.P., Atlas Venture Associates Opportunity II, LP, Atlas Venture Associates Opportunity II, LLC | Sale (S): 47,500 @ $67.65 · Sale (S): 82,500 @ $67.65 · Sale (S): 20,000 @ $67.65 | EDGAR |
| 2024-01-16 | 4 | Xilio Therapeutics, Inc. (XLO) jointly with Atlas Venture Fund XI, L.P., Atlas Venture Associates XI, L.P., Atlas Venture Associates XI, LLC, Atlas Venture Opportunity Fund I, L.P., Atlas Venture Associates Opportunity I, LLC | Sale (S): 1,566 @ $0.87 · Sale (S): 569 @ $0.87 · Sale (S): 1,540 @ $0.83 · Sale (S): 560 @ $0.83 | EDGAR |
| 2024-01-12 | 4 | Disc Medicine, Inc. (IRON) jointly with Atlas Venture Fund X, L.P., ATLAS VENTURE ASSOCIATES X, L.P., Atlas Venture Associates X, LLC, Atlas Venture Opportunity Fund I, L.P., Atlas Venture Associates Opportunity I, LLC | Sale (S): 30,000 @ $64 · Sale (S): 20,000 @ $64 | EDGAR |
FilingPulse's Form 4 archive currently extends back to 2024-01-11 and is expanding backward through EDGAR history — earlier filings by this insider may not be indexed yet. Names and roles are shown as filed.
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