William A. Heyburn
CIK 1859732 · Co-CEO and CFO · last filed 2026-06-18
"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.
Loading insider history…
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 · Page 5 of 6
51 filingsInsider 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 |
|---|---|---|---|---|---|
| 2023-01-12 | Strata Critical Medical, Inc. (BLDEW) Delisted | Sell (S) | −4,306 | -$15.0K | EDGAR |
| 2023-01-05 | Strata Critical Medical, Inc. (BLDEW) Delisted | Exer (M) | +56,238 | $10.1K | EDGAR |
| 2022-11-14 | Strata Critical Medical, Inc. (BLDEW) Delisted | Grant (A) | +916,323 | $0 | EDGAR |
| 2022-10-11 | Strata Critical Medical, Inc. (BLDEW) Delisted | Sell (S) | −3,744 | -$14.9K | EDGAR |
| 2022-08-08 | Strata Critical Medical, Inc. (BLDEW) Delisted | Tax (F) | −3,677 | -$16.2K | EDGAR |
| 2022-04-06 | Strata Critical Medical, Inc. (BLDEW) Delisted | Tax (F) | −3,866 | -$33.2K | EDGAR |
| 2022-02-01 | Strata Critical Medical, Inc. (BLDEW) Delisted | Exer (M) | +70,000 | $12.6K | EDGAR |
| 2021-12-20 | Strata Critical Medical, Inc. (BLDEW) Delisted | Grant (A) | +106,371 | $0 | EDGAR |
| 2021-12-16 | Strata Critical Medical, Inc. (BLDEW) Delisted | Mixed | −105,320 | -$1.05M | EDGAR |
| 2021-09-20 | Strata Critical Medical, Inc. (BLDEW) Delisted | Exer (M) | +5,000 | $900 | EDGAR |
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.
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.