Brian S Posner
CIK 1372455 · last filed 2026-06-09
Brian S Posner is a corporate insider who has filed 80 SEC Form 4 insider transactions across 9 companies since 2008. The most recent filing, for DYN, was dated Jun 9, 2026. Across all open-market trades the lifetime net is −$5.7M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $2.1M across reported positions.
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
$2.08M
9
80
-$5.72M
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| DYN | Director | 24,500 | $18.19 | $445.7K | $274.8K | 8 | 2026-06-09 |
| ACGLO | Director | 0 | $19.33 | $0 | $208.3K | 21 | 2026-06-04 |
| BIIB | Director | 8,175 | $200.05 | $1.64M | -$6.74M | 26 | 2021-07-02 |
| Bioverativ Inc. (BIVV) Delisted | Director | 0 | — | — | $166.9K | 7 | 2018-03-08 |
| ARCH CAPITAL GROUP LTD. (ARHpC.CL) Delisted | Director | 6,000 | — | — | $0 | 1 | 2018-01-02 |
| ARCH CAPITAL GROUP LTD. (ARHpC) Delisted | Director | 6,000 | — | — | $316.4K | 10 | 2017-09-26 |
| BG Medicine, Inc. (BGMD) Delisted | Director | 20,000 | — | — | $52.0K | 4 | 2013-06-14 |
| ANADYS PHARMACEUTICALS INC (ANDS) Delisted | Director | — | — | — | $0 | 1 | 2011-08-24 |
| ARCH CAPITAL GROUP LTD. (ARHpB) Delisted | Director | 1,658 | — | — | $0 | 2 | 2011-05-09 |
Recent Filings
80 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-06-09 | DYN | Mixed | +2,000 | $33.9K | EDGAR |
| 2026-06-05 | DYN | Buy (P) | +2,500 | $43.7K | EDGAR |
| 2026-06-04 | ACGLO | Sell (S) | −3,000 | -$59.0K | EDGAR |
| 2026-05-28 | DYN | Buy (P) | +2,000 | $36.4K | EDGAR |
| 2026-05-22 | DYN | Buy (P) | +2,500 | $42.8K | EDGAR |
| 2026-05-12 | ACGLO | Sell (S) | −2,000 | -$34.3K | EDGAR |
| 2026-05-07 | ACGLO | Grant (A) | +2,071 | $0 | EDGAR |
| 2026-04-01 | DYN | Buy (P) | +2,000 | $34.2K | EDGAR |
| 2026-03-13 | DYN | Buy (P) | +2,000 | $38.7K | EDGAR |
| 2026-03-12 | ACGLO | Sell (S) | −3,000 | -$51.3K | EDGAR |