Constantin Ionel Stefan
CIK 1940928 · Chief Technology Officer · last filed 2026-05-28
Constantin Ionel Stefan is a Chief Technology Officer who has filed 23 SEC Form 4 insider transactions across 1 company since 2022. The most recent filing shows the insider sold $55.2K of AMPX.WS on May 28, 2026. Across all open-market trades the lifetime net is −$10.9M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $5.7M 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.
$5.69M
1
23
-$10.93M
Holdings By Company
| 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
23 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-05-28 | AMPX.WS | Sell (S) | −3,208 | -$55.2K | EDGAR |
| 2026-05-26 | AMPX.WS | Sell (S) | −28,812 | -$426.1K | EDGAR |
| 2026-03-06 | AMPX.WS | Grant (A) | +110,000 | $0 | EDGAR |
| 2026-02-24 | AMPX.WS | Sell (S) | −25,366 | -$257.6K | EDGAR |
| 2026-01-30 | AMPX.WS | Mixed | — | -$474.3K | EDGAR |
| 2026-01-23 | AMPX.WS | Mixed | — | -$6.75M | EDGAR |
| 2025-12-15 | AMPX.WS | Mixed | −73,255 | -$2.08M | EDGAR |
| 2025-11-25 | AMPX.WS | Sell (S) | −25,024 | -$252.3K | EDGAR |
| 2025-08-25 | AMPX.WS | Sell (S) | −19,159 | -$130.6K | EDGAR |
| 2025-05-23 | AMPX.WS | Sell (S) | −20,366 | -$49.5K | EDGAR |