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About ONTO INNOVATION INC. (ONTO)
ONTO INNOVATION INC. files with the SEC under CIK 0000704532 and is classified as measuring and controlling devices, nec. We track it alongside the rest of the Information Technology sector. The registration was withdrawn on 26 November 2025, so the planned offering is not going ahead in its filed form.
ONTO Form 4 activity by transaction type, last 90 days
| Form 4 transaction type | Transactions | Shares | Total value |
|---|---|---|---|
| Open-market sale | 2 | 3,000 | $902K |
| Tax withholding / forfeiture | 3 | 7,994 |
Dollar totals cover purchases and sales only (codes P and S). Grants, option exercises, gifts and tax withholding are counted in shares, because none of them is a trade at a market price.
ONTO insider transactions (Form 4)
437 Form 4 filings on record, the earliest from Oct 4, 2024, newest first. Filing history page 2 of 2.
| Date | Insider | Transaction | Security | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Christopher A. Seams - Director | Grant or award | Common Stock | 2,114 | $0.00 | - | |
| Mark Slicer - Officer | Open-market sale | Common Stock | 1,100 | $160.41 | $176K | |
| Yoon Ah Oh - Officer | Tax withholding / forfeiture | Common Stock | 1,296 | $204.39 | $265K | |
 Ramil Yaldaei - Officer | Tax withholding / forfeiture | Common Stock | 592 | $206.55 | $122K |
Recent ONTO Form 144 notices of proposed sale
2An insider files Form 144 before selling restricted or control stock. It announces a planned sale. If the sale goes ahead, it shows up later on a Form 4.
| Filed | Filer | Relationship | Shares | Market value | Notice |
|---|---|---|---|---|---|
| DAVID B MILLER | Director | 2,000 | $600K | View on EDGAR | |
| SUSAN D LYNCH | Director | 1,000 |
ONTO insider trading FAQ
What is the latest insider trade for ONTO?
ONTO INNOVATION INC. (ONTO) had 5 insider filings in the last 90 days, with the most recent on 2026-10-01. The full record for ONTO runs to 37 Form 4 filings, the earliest from 2024-10-04. InsiderAlpha adds new Form 4, Form 144 and 8-K filings as they arrive from SEC EDGAR.
How many insiders are buying ONTO stock?
No insider purchases of ONTO were filed in the last 90 days.
How many insiders are selling ONTO stock?
2 insider sales of ONTO were filed in the last 90 days, totaling $902K.
Where can I see ONTO SEC filings (Form 4, 10-K, 10-Q, 8-K)?
This page collects ONTO Form 4 insider transactions, Form 144 sale notices and 8-K filings in one place. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
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Recent insider filings
10The EDGAR links open each original Form 4, so you can check any number on this page against the filing it came from.
- - David Brian Miller view on EDGAR
- - Brian K. Roberts view on EDGAR
- - Shirley Chen view on EDGAR
- - Brian K. Roberts view on EDGAR
- - Susan D. Lynch view on EDGAR
- - May Su view on EDGAR
- - Christopher A. Seams view on EDGAR
- - Stephen S. Schwartz view on EDGAR
- - David Brian Miller view on EDGAR
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Learn more
- Insider selling: signal or noise?
- Why most insider sales are routine, and the few patterns worth a second look.
- Form 144 vs Form 4
- A Form 144 announces a planned sale; the Form 4 reports it after it happens.
- Insider activity in Information Technology
- Where ONTO's peers are being bought and sold.
- Every recent Form 4
- The market-wide feed, updated as filings arrive from SEC EDGAR.
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- The daily trading plan of ranked insider buys, on a delay, with the plan archive
