Constantin Ionel Stefan
CIK 1940928 · Chief Technology Officer · last filed 2026-05-28
"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
$5.69M
Companies
1
Total Filings
23
Lifetime Open-Market Net
-$10.93M
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 |
|---|---|---|---|---|---|---|---|
| AMPX.WS | Chief Technology Officer | 801,310 | $7.10 | $5.69M | -$10.93M | 22 | 2026-05-28 |
Recent Filings · Page 3 of 3
23 filingsForm 4 transactions across all companies, newest first.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2023-05-03 | AMPX.WS | Tax (F) | −209 | -$1.5K | EDGAR |
| 2022-12-15 | AMPX.WS | Exer (M) | +30,000 | $1.5K | EDGAR |
| 2022-09-16 | — | Grant (A) | — | $0 |
Showing 21–23 of 23
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Page 3 of 3
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.