| Insider | Role | Shares | Value | Buys | Sells |
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| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
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| Insider | Role | Shares | Value | Buys | Sells |
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| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
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Chief Financial Officer
1 company
Mark Slicer last filed a Form 4 in May 2025, as Chief Financial Officer at ONTO. Mark Slicer's net worth is not public. Form 4 filings only show shares in the companies where this person was an insider, as of the last filing.
Our model assigns Mark Slicer a middling insider score of 55/100, based on 4 past trades. Over a 12-month horizon, 75.0% of those trades were profitable, with an average 12-month return of +17.9%.
At the last filing, the largest reported position was 13,640 shares of ONTO. The ONTO filings lean toward selling, a net 5,143 shares.
Mark Slicer has 13 Form 4 filings on record from May 2022 to May 2025, all as Chief Financial Officer at Onto Innovation (ONTO), 2022–2025.
The 25 reported transactions were 7 tax withholdings, 7 open-market sales, 6 option or other derivative awards and 4 stock awards, plus smaller numbers of other types.
Counted by filing, the open-market trades come to no purchases and 3 sales worth about $780K.
The largest open-market sale was 3,005 shares of ONTO at an average $125.14 on September 15, 2023, about $376K. Twelve months later ONTO was up 59%.
All 3 sales since April 2023 were made under a Rule 10b5-1 trading plan, set up in advance.
Shares as reported in the last Form 4 for each company; the most recent is from May 2025. Values use today's prices. Any trades after the last filing were not reported, so current holdings may differ.
| Date | Ticker | Role | Type | Shares | Price | Value | Chg% | 3M | 12M | SEC |
|---|---|---|---|---|---|---|---|---|---|---|
| Nov 15, 2024 | ONTO Onto Innovation Inc. | Chief Financial Officer | Sell10b5-1 | 1,100 | $160.41 | $176,451.00 | -9.1% | +9.7% | -19.3% | |
| Jun 7, 2024 | ONTO Onto Innovation Inc. | Chief Financial Officer | Sell10b5-1 | 1,038 | $219.19 | $227,519.22 | -7.9% | -13.6% | -55.8% | |
| Sep 15, 2023 | ONTO Onto Innovation Inc. | Chief Financial Officer | Sell10b5-1 | 3,005 | $125.14 | $376,040.16 | -18.6% | +26.0% | +59.0% |