THOMAS J SEIFERT
CIK 1473289 · Chief Financial Officer · last filed 2026-05-19
THOMAS J SEIFERT is a Chief Financial Officer who has filed 179 SEC Form 4 insider transactions across 4 companies since 2009. The most recent filing, for NET, was dated May 19, 2026. Across all open-market trades the lifetime net is −$272.8M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $142.7M 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.
$142.68M
4
179
-$272.77M
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| NET | Chief Financial Officer | 221,214 | $228.48 | $50.54M | -$269.29M | 146 | 2026-05-19 |
| WOLF | Director | 20,476 | $43.14 | $883.3K | $0 | 2 | 2025-02-03 |
| IPGP | Director | 8,946 | $114.65 | $1.03M | -$3.48M | 13 | 2022-05-25 |
| AMD | SVP, CFO | 176,383 | $511.57 | $90.23M | $0 | 12 | 2012-06-19 |
Recent Filings
179 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-05-19 | NET | Mixed | −9,667 | -$3.94M | EDGAR |
| 2026-04-17 | NET | Mixed | −2,944 | -$2.51M | EDGAR |
| 2026-03-17 | NET | Mixed | −2,943 | -$2.82M | EDGAR |
| 2026-03-13 | NET | Grant (A) | +142,116 | $0 | EDGAR |
| 2026-02-24 | NET | Mixed | −31,557 | -$7.69M | EDGAR |
| 2026-02-18 | NET | Tax (F) | −20,477 | -$4.01M | EDGAR |
| 2026-01-21 | NET | Mixed | — | -$1.78M | EDGAR |
| 2025-12-23 | NET | Mixed | — | -$2.02M | EDGAR |
| 2025-11-21 | NET | Mixed | −31,555 | -$8.07M | EDGAR |
| 2025-11-17 | NET | Tax (F) | −20,476 | -$4.31M | EDGAR |