Posner Brian S — SEC Form 4 filings
SEC reporting owner CIK 1372455. 15 Form 4 filings on record with FilingPulse; latest filed 2026-06-09.
Transaction summary — filings shown
Covers all 15 filings on record, filed 2024-05-13 to 2026-06-09. Counts and totals are arithmetic on values as filed — descriptive data, not a recommendation.
- Open-market purchases (code P, non-derivative): 8 legs across 8 filings — 17,000 shares, $292,178 total (shares × price as filed).
- Open-market sales (code S, non-derivative): 3 legs across 3 filings — 8,000 shares, $144,608 total (shares × price as filed).
- Other reported legs (grants, option exercises, tax withholding, gifts, derivative-security transactions, …): 5.
- Largest priced transaction: sale of 3,000 shares @ $19.66 ($58,980) in ARCH CAPITAL GROUP LTD., filed 2026-06-04.
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) | Director | 8 | 7 legs · 16,000 sh · $274,840 | — | 2 |
| ARCH CAPITAL GROUP LTD. (ACGL) | Director | 7 | 1 leg · 1,000 sh · $17,338 | 3 legs · 8,000 sh · $144,608 | 3 |
Form 4 filings — Posner Brian S
| Filed | Form | Issuer | Reported transactions | Source |
|---|---|---|---|---|
| 2026-06-09 | 4 | Dyne Therapeutics, Inc. (DYN) | Purchase (P): 2,000 @ $16.94 · Grant/award (A): 35,152 (derivative) @ $0 | EDGAR |
| 2026-06-05 | 4 | Dyne Therapeutics, Inc. (DYN) | Purchase (P): 2,500 @ $17.48 | EDGAR |
| 2026-06-04 | 4 | ARCH CAPITAL GROUP LTD. (ACGL) | Sale (S): 3,000 @ $19.66 | EDGAR |
| 2026-05-28 | 4 | Dyne Therapeutics, Inc. (DYN) | Purchase (P): 2,000 @ $18.21 | EDGAR |
| 2026-05-22 | 4 | Dyne Therapeutics, Inc. (DYN) | Purchase (P): 2,500 @ $17.12 | EDGAR |
| 2026-05-12 | 4 | ARCH CAPITAL GROUP LTD. (ACGL) | Sale (S): 2,000 @ $17.14 | EDGAR |
| 2026-05-07 | 4 | ARCH CAPITAL GROUP LTD. (ACGL) | Grant/award (A): 2,071 | EDGAR |
| 2026-04-01 | 4 | Dyne Therapeutics, Inc. (DYN) | Purchase (P): 2,000 @ $17.08 | EDGAR |
| 2026-03-13 | 4 | Dyne Therapeutics, Inc. (DYN) | Purchase (P): 2,000 @ $19.35 | EDGAR |
| 2026-03-12 | 4 | ARCH CAPITAL GROUP LTD. (ACGL) | Sale (S): 3,000 @ $17.11 | EDGAR |
| 2026-03-10 | 4 | Dyne Therapeutics, Inc. (DYN) | Purchase (P): 3,000 @ $15.06 | EDGAR |
| 2025-10-02 | 4 | Dyne Therapeutics, Inc. (DYN) | Grant/award (A): 70,000 (derivative) @ $0 | EDGAR |
| 2025-08-04 | 4 | ARCH CAPITAL GROUP LTD. (ACGL) | Purchase (P): 1,000 @ $17.34 | EDGAR |
| 2025-05-09 | 4 | ARCH CAPITAL GROUP LTD. (ACGL) | Grant/award (A): 1,564 | EDGAR |
| 2024-05-13 | 4 | ARCH CAPITAL GROUP LTD. (ACGL) | Grant/award (A): 1,455 | 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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