Posner Brian S
Director · DYN, ACGL
As of 2026-09-16, Posner Brian S has 17 Form 4 transactions on record across 2 companies — 14 in the trailing 12 months.
Everything this person has disclosed to the SEC on Form 4 — across every company they file for — reconstructed from the public record. A filing history, not a tip sheet.
Reconstructed holdings
- Direct $424K
- Indirect $0
| DYN | direct | 24,500 sh | $424K |
Reconstructed from this person's own Form 4 filings — the total each filing reported owning afterward, priced at the close on the as-of date shown. A filed position can lag the real one.
Direct and indirect holdings (e.g. through a trust or fund) are tagged separately, as filed.
Trades by company
Filing ledger
| Date | Company | Action | Shares @ price | Value | Ownership Δ | Owned after | Filing |
|---|---|---|---|---|---|---|---|
| 2026-06-08 | DYN | Purchase | 2,000 @ $16.94 | $34K | +8.9% of holding | 24,500 | Form 4 |
| 2026-06-03 | ACGL | Sale | 3,000 @ $19.66 | $59K | −100.0% of holding | 0 | Form 4 |
| 2026-06-03 | DYN | Purchase | 2,500 @ $17.48 | $44K | +12.5% of holding | 22,500 | Form 4 |
| 2026-05-26 | DYN | Purchase | 2,000 @ $18.21 | $36K | +11.1% of holding | 20,000 | Form 4 |
| 2026-05-20 | DYN | Purchase | 2,500 @ $17.12 | $43K | +16.1% of holding | 18,000 | Form 4 |
| 2026-05-11 | ACGL | Sale | 2,000 @ $17.14 | $34K | −100.0% of holding | 0 | Form 4 |
| 2026-03-30 | DYN | Purchase | 2,000 @ $17.08 | $34K | +14.8% of holding | 15,500 | Form 4 |
| 2026-03-11 | ACGL | Sale | 3,000 @ $17.11 | $51K | −60.0% of holding | 2,000 | Form 4 |
| 2026-03-11 | DYN | Purchase | 2,000 @ $19.35 | $39K | +17.4% of holding | 13,500 | Form 4 |
| 2026-03-06 | DYN | Purchase | 3,000 @ $15.06 | $45K | +35.3% of holding | 11,500 | Form 4 |
| 2025-08-01 | ACGL | Purchase | 1,000 @ $17.34 | $17K | +25.0% of holding | 5,000 | Form 4 |
6 award / exercise / gift records — not counted as purchases
| Date | Company | Action | Shares | Owned after | Filing |
|---|---|---|---|---|---|
| 2026-06-05 | DYN | Award / grant | 35,152 | 35,152 | Form 4 |
| 2026-05-05 | ACGL | Award / grant | 2,071 | 122,175 | Form 4 |
| 2026-05-05 | ACGL | Award / grant | 2,071 | 122,175 | Form 4 |
| 2025-10-01 | DYN | Award / grant | 70,000 | 70,000 | Form 4 |
| 2025-05-07 | ACGL | Award / grant | 1,564 | 120,104 | Form 4 |
| 2025-05-07 | ACGL | Award / grant | 1,564 | 120,104 | Form 4 |
Source: SEC Form 4 filings. Each row links to its original filing.
Research tool, not investment advice — historical frequencies, not recommendations. A product of Marovel Technologies LLC. Full terms.