Plisinski Michael P
Director · Officer · ONTO
As of 2026-09-16, Plisinski Michael P has 28 Form 4 transactions on record across 1 company — 12 in the trailing 12 months.
Everything this person has disclosed to the SEC on Form 4 — across every company they file for — reconstructed from the public record. A filing history, not a tip sheet.
Reconstructed holdings
- Direct $43.7M
- Indirect $0
| ONTO | direct | 179,242 sh | $43.7M |
Reconstructed from this person's own Form 4 filings — the total each filing reported owning afterward, priced at the close on the as-of date shown. A filed position can lag the real one.
Direct and indirect holdings (e.g. through a trust or fund) are tagged separately, as filed.
Trades by company
Filing ledger
| Date | Company | Action | Shares @ price | Value | Ownership Δ | Owned after | Filing |
|---|---|---|---|---|---|---|---|
| 2025-01-21 | ONTO | Sale | 35,000 @ $219.19 | $7.7M | −18.9% of holding | 150,492 | Form 4 |
| 2025-01-16 | ONTO | Sale | 29,900 @ $211.24 | $6.3M | −13.9% of holding | 185,592 | Form 4 |
| 2025-01-16 | ONTO | Sale | 100 @ $212.11 | $21K | −0.1% of holding | 185,492 | Form 4 |
| 2025-01-14 | ONTO | Sale | 18,268 @ $200.09 | $3.7M | −7.8% of holding | 217,224 | Form 4 |
| 2025-01-14 | ONTO | Sale | 1,732 @ $201.26 | $349K | −0.8% of holding | 215,492 | Form 4 |
23 award / exercise / gift records — not counted as purchases
| Date | Company | Action | Shares | Owned after | Filing |
|---|---|---|---|---|---|
| 2026-03-03 | ONTO | Withheld for tax | 3,742 | 179,242 | Form 4 |
| 2026-03-02 | ONTO | Award / grant | 7,239 | 7,239 | Form 4 |
| 2026-03-02 | ONTO | Award / grant | 14,479 | 182,984 | Form 4 |
| 2026-03-01 | ONTO | Withheld for tax | 2,222 | 170,430 | Form 4 |
| 2026-03-01 | ONTO | Withheld for tax | 1,925 | 168,505 | Form 4 |
| 2026-03-01 | ONTO | Option exercise | 5,971 | 0 | Form 4 |
| 2026-03-01 | ONTO | Option exercise | 4,597 | 172,652 | Form 4 |
| 2026-02-14 | ONTO | Withheld for tax | 8,919 | 171,687 | Form 4 |
| 2026-02-14 | ONTO | Withheld for tax | 3,632 | 168,055 | Form 4 |
| 2026-02-14 | ONTO | Option exercise | 18,445 | 180,606 | Form 4 |
| 2026-02-14 | ONTO | Option exercise | 11,824 | 0 | Form 4 |
| 2025-12-24 | ONTO | Gift | 25,000 | 162,161 | Form 4 |
| 2025-03-03 | ONTO | Award / grant | 23,212 | 187,161 | Form 4 |
| 2025-03-03 | ONTO | Award / grant | 11,606 | 11,606 | Form 4 |
| 2025-03-01 | ONTO | Withheld for tax | 1,925 | 163,949 | Form 4 |
| 2025-02-14 | ONTO | Withheld for tax | 11,435 | 169,686 | Form 4 |
| 2025-02-14 | ONTO | Withheld for tax | 3,812 | 165,874 | Form 4 |
| 2025-02-14 | ONTO | Option exercise | 23,650 | 181,121 | Form 4 |
| 2025-02-14 | ONTO | Option exercise | 11,825 | 0 | Form 4 |
| 2025-02-10 | ONTO | Withheld for tax | 9,210 | 157,471 | Form 4 |
| 2025-02-10 | ONTO | Withheld for tax | 2,859 | 147,633 | Form 4 |
| 2025-02-10 | ONTO | Option exercise | 9,524 | 0 | Form 4 |
| 2025-02-10 | ONTO | Option exercise | 19,048 | 166,681 | Form 4 |
Source: SEC Form 4 filings. Each row links to its original filing.
Research tool, not investment advice — historical frequencies, not recommendations. A product of Marovel Technologies LLC. Full terms.