William A. Heyburn
CIK 1859732 · Co-CEO and CFO · last filed 2026-09-25
William A. Heyburn is a Co-CEO and CFO who has filed 54 SEC Form 4 insider transactions across 3 companies since 2021. The most recent filing, for SRTA, was dated Sep 25, 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 $8.2M 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.
Charts
Trading activity, where the exposure sits, and each trade against the stock price.
BLDEW price and trades
Daily close with each Form 4 filing on this company marked: green = open-market buy, red = open-market sale, purple = grants, exercises, gifts and other non-market transactions. Marker size scales with the dollar value.
Shares held
Shares owned after each reported transaction on this company (direct holdings as reported).
Open-market buying and selling
by monthDollar value of open-market purchases (code P, up) and sales (code S, down) across all companies, by filing month. Grants, exercises and gifts are excluded.
Exposure by company
latestMost recently reported shares × current price. Faded bars (*) have had no filing in 3 years, so the person may no longer hold them. Click a bar to chart that company.
Filer Profile
31 HUDSON YARDS, 14TH FLOOR
NEW YORK, NY 10001
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| SRTA | Co-CEO and CFO | 1,856,206 | $4.44 | $8.24M | -$185.9K | 5 | 2026-09-25 |
| 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
54 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-09-25 | SRTA | Mixed | +79,502 | -$518.3K | EDGAR |
| 2026-09-10 | SRTA | Tax (F) | −31,671 | -$168.2K | EDGAR |
| 2026-08-03 | SRTA | Mixed | +161,022 | -$1.01M | EDGAR |
| 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 |
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.