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William A. Heyburn

CIK 1859732 · Co-CEO and CFO · last filed 2026-06-18

William A. Heyburn is a Co-CEO and CFO who has filed 51 SEC Form 4 insider transactions across 3 companies since 2021. The most recent filing shows the insider had shares withheld for taxes covering $185.9K of SRTA on Jun 18, 2026. Across all open-market trades the lifetime net is −$2.5M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $7.8M 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

$7.78M

Companies

3

Total Filings

51

Lifetime Open-Market Net

-$2.52M

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
SRTA Co-CEO and CFO 1,548,997 $5.02 $7.78M -$185.9K 2 2026-06-18
Strata Critical Medical, Inc. (SRTAW) Delisted Co-CEO and CFO 1,882,399 $0.00 $1.1K $76.0K 6 2026-04-27
Strata Critical Medical, Inc. (BLDEW) Delisted Chief Financial Officer 1,463,940 $0.18 $262.6K -$2.41M 35 2025-08-05

Recent Filings

51 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
2026-06-18 SRTA Tax (F) −31,671 -$185.9K EDGAR
2026-06-10 SRTA Sell (S) −31,671 -$185.9K EDGAR
2026-04-27 Strata Critical Medical, Inc. (SRTAW) Delisted Mixed +243,894 -$1.48M EDGAR
2026-03-10 Strata Critical Medical, Inc. (SRTAW) Delisted Tax (F) −31,314 -$142.2K EDGAR
2025-12-12 Strata Critical Medical, Inc. (SRTAW) Delisted Tax (F) −35,348 -$154.8K EDGAR
2025-12-10 Strata Critical Medical, Inc. (SRTAW) Delisted Buy (P) +17,000 $76.0K EDGAR
2025-11-05 Strata Critical Medical, Inc. (SRTAW) Delisted Mixed +80,939 -$503.7K EDGAR
2025-09-12 Strata Critical Medical, Inc. (SRTAW) Delisted Tax (F) −35,348 -$141.4K EDGAR
2025-08-05 Strata Critical Medical, Inc. (BLDEW) Delisted Mixed +16,191 -$535.8K EDGAR
2025-08-04 SRTA Notice (144) −46,918 -$177.4K EDGAR
Showing 1–10 of 51
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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.