Atlas Venture Associates X, LLC — SEC Form 4 filings
SEC reporting owner CIK 1742765. 4 Form 4 filings on record with FilingPulse; latest filed 2026-02-09.
Transaction summary — filings shown
Covers all 4 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): 17 legs across 3 filings — 553,357 shares, $28,259,876 total (shares × price as filed).
- Other reported legs (grants, option exercises, tax withholding, gifts, derivative-security transactions, …): 3.
- Largest priced transaction: sale of 82,500 shares @ $67.65 ($5,581,125) in Disc Medicine, Inc., filed 2024-01-25.
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 |
|---|---|---|---|---|---|
| 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 | — |
| Generation Bio Co. (GBIO) | 10% owner | 1 | — | — | 3 |
Form 4 filings — Atlas Venture Associates X, LLC
| 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 Opportunity Fund I, L.P., Atlas Venture Associates Opportunity I, L.P., Atlas Venture Associates Opportunity I, LLC | Code (U): 711,193 · Code (U): 116,693 · Code (U): 60 | 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 Opportunity Fund I, L.P., Atlas Venture Associates Opportunity 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 |
| 2024-01-25 | 4 | Disc Medicine, Inc. (IRON) jointly with Atlas Venture Fund X, L.P., ATLAS VENTURE ASSOCIATES X, L.P., Atlas Venture Opportunity Fund I, L.P., Atlas Venture Associates Opportunity 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 |
| 2024-01-12 | 4 | Disc Medicine, Inc. (IRON) jointly with Atlas Venture Fund X, L.P., ATLAS VENTURE ASSOCIATES X, L.P., Atlas Venture Opportunity Fund I, L.P., Atlas Venture Associates Opportunity 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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