ARCH Venture Fund X Overage, L.P. — SEC Form 4 filings
SEC reporting owner CIK 1757017. 6 Form 4 filings on record with FilingPulse; latest filed 2026-07-06.
Transaction summary — filings shown
Covers all 6 filings on record, filed 2024-02-12 to 2026-07-06. Counts and totals are arithmetic on values as filed — descriptive data, not a recommendation.
- Open-market purchases (code P, non-derivative): 8 legs across 5 filings — 10,164,181 shares, $48,199,962 total (shares × price as filed).
- Open-market sales (code S, non-derivative): 1 leg across 1 filing — 16,000 shares, $39,840 total (shares × price as filed).
- Other reported legs (grants, option exercises, tax withholding, gifts, derivative-security transactions, …): 12.
- Largest priced transaction: purchase of 3,200,000 shares @ $6.25 ($20,000,000) in Prime Medicine, Inc., filed 2024-02-20.
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 |
|---|---|---|---|---|---|
| Prime Medicine, Inc. (PRME) | 10% owner | 2 | 2 legs · 6,230,300 sh · $29,999,990 | — | — |
| Sana Biotechnology, Inc. (SANA) | 10% owner | 1 | 3 legs · 1,818,181 sh · $9,999,996 | — | — |
| Neumora Therapeutics, Inc. (NMRA) | 10% owner | 1 | 1 leg · 1,915,700 sh · $4,999,977 | — | — |
| Boundless Bio, Inc. (BOLD) | 10% owner | 2 | 2 legs · 200,000 sh · $3,200,000 | 1 leg · 16,000 sh · $39,840 | 12 |
Form 4 filings — ARCH Venture Fund X Overage, L.P.
| Filed | Form | Issuer | Reported transactions | Source |
|---|---|---|---|---|
| 2026-07-06 | 4 | Boundless Bio, Inc. (BOLD) jointly with ARCH Venture Fund IX, L.P., ARCH Venture Fund IX Overage, L.P., ARCH Venture Partners IX, L.P., ARCH Venture Partners IX Overage, L.P., ARCH Venture Partners X Overage, L.P., ARCH Venture Partners IX, LLC, ARCH Venture Partners X, LLC | Option exercise (M): 16,000 @ $1.03 · Sale (S): 16,000 @ $2.49 · Option exercise (M): 16,000 (derivative) @ $0 | EDGAR |
| 2025-10-29 | 4 | Neumora Therapeutics, Inc. (NMRA) jointly with ARCH Venture Partners X, LLC, ARCH Venture Fund X, L.P., ARCH Venture Partners X, L.P., ARCH Venture Partners X Overage, L.P., ARCH Venture Partners VII, LLC, ARCH Venture Partners VII, L.P., ARCH Venture Fund VII, L.P., ARCH Venture Partners VIII, LLC, ARCH Venture Fund VIII Overage, L.P. | Purchase (P): 1,915,700 @ $2.61 | EDGAR |
| 2025-08-01 | 4 | Prime Medicine, Inc. (PRME) jointly with ARCH Venture Partners X, LLC, ARCH Venture Partners X, L.P., ARCH Venture Partners X Overage, L.P., ARCH Venture Fund X, L.P., CRANDELL KEITH, Burow Kristina, GILLIS STEVEN | Purchase (P): 3,030,300 @ $3.30 | EDGAR |
| 2024-04-04 | 4 | Boundless Bio, Inc. (BOLD) jointly with ARCH Venture Fund IX, L.P., ARCH Venture Fund IX Overage, L.P., ARCH Venture Partners IX, L.P., ARCH Venture Partners IX Overage, L.P., ARCH Venture Partners X Overage, L.P., ARCH Venture Partners IX, LLC, ARCH Venture Partners X, LLC | Conversion (C): 589,743 · Conversion (C): 787,545 · Conversion (C): 1,048,433 · Purchase (P): 66,667 @ $16 · Purchase (P): 133,333 @ $16 · Conversion (C): 424,908 (derivative) · +6 more | EDGAR |
| 2024-02-20 | 4 | Prime Medicine, Inc. (PRME) jointly with ARCH Venture Partners X, LLC, ARCH Venture Partners X, L.P., ARCH Venture Partners X Overage, L.P., ARCH Venture Fund X, L.P., CRANDELL KEITH, Burow Kristina, GILLIS STEVEN | Purchase (P): 3,200,000 @ $6.25 | EDGAR |
| 2024-02-12 | 4 | Sana Biotechnology, Inc. (SANA) jointly with ARCH Venture Fund X, L.P., ARCH Venture Fund IX, L.P., ARCH Venture Fund IX Overage, L.P., ARCH Venture Partners IX, L.P., ARCH Venture Partners IX Overage, L.P., ARCH Venture Partners X, L.P., ARCH Venture Partners X Overage, L.P., ARCH Venture Partners IX, LLC, ARCH Venture Partners X, LLC | Purchase (P): 363,637 @ $5.50 · Purchase (P): 727,272 @ $5.50 · Purchase (P): 727,272 @ $5.50 | 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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