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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 7 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 $4.2M 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.

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Disclosed Exposure

$4.23M

Companies

7

Total Filings

80

Lifetime Open-Market Net

-$5.72M

Holdings By Company

Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
Symbol Role Shares Price Disclosed Exposure Lifetime OM Net Filings Latest Filed
DYN Director 24,500 $25.90 $634.5K $274.8K 8 2026-06-09
ACGLO Director 0 $19.50 $0 $208.3K 21 2026-06-04
BIIB Director 8,175 $205.61 $1.68M -$6.74M 26 2021-07-02
Bioverativ Inc. (BIVV) Delisted Director 0 — — $166.9K 7 2018-03-08
ACGL Director 18,000 $106.48 $1.92M $316.4K 13 2018-01-02
BG Medicine, Inc. (BGMD) Delisted Director 5,000 — — $52.0K 4 2013-06-14
ANADYS PHARMACEUTICALS INC (ANDS) Delisted Director — — — $0 1 2011-08-24

Recent Filings

80 filings
Insider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
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
Showing 1–10 of 80
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Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.