Michael P Plisinski
CIK 1325550 · Chief Executive Officer · last filed 2026-03-04
"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
$46.91M
Companies
2
Total Filings
94
Lifetime Open-Market Net
-$34.70M
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 |
|---|---|---|---|---|---|---|---|
| ONTO | Chief Executive Officer | 182,984 | $256.37 | $46.91M | -$34.01M | 33 | 2026-03-04 |
| RUDOLPH TECHNOLOGIES INC (RTEC) Delisted | Chief Executive Officer | 336,513 | — | — | -$692.3K | 55 | 2019-10-02 |
Recent Filings · Page 4 of 10
94 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 |
|---|---|---|---|---|---|
| 2021-02-09 | ONTO | Tax (F) | −7,588 | -$454.9K | EDGAR |
| 2021-01-29 | ONTO | Tax (F) | −3,906 | -$214.2K | EDGAR |
| 2020-11-05 | ONTO | Sell (S) | −70,000 | -$2.47M | EDGAR |
| 2020-10-16 | ONTO | Mixed | +22,810 | -$340.1K | EDGAR |
| 2020-02-11 | ONTO | Mixed | +26,978 | -$171.3K | EDGAR |
| 2020-02-10 | ONTO | Disp (D) | −4,232 | -$171.3K | EDGAR |
| 2020-01-29 | ONTO | Disp (D) | −4,489 | -$171.9K | EDGAR |
| 2019-10-30 | ONTO | Grant (A) | +298,734 | $0 | EDGAR |
| 2019-10-29 | — | Mixed | −336,513 | $0 | |
| 2019-10-02 | RUDOLPH TECHNOLOGIES INC (RTEC) Delisted | Disp (D) | −624 | -$16.5K | 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.