KELLEY, STEPHEN DOUGLAS
Director
- Shares
- 761
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 20, 2026
Methodology published · Market data, model notes, and corrections process are public · Data policy · Corrections policy
NYSE · TECHNOLOGY · Holders
Onto Innovation Inc (ONTO) Institutional Ownership & Insider Trading History
Recent insider purchases and sales for ONTO from Form 4 filings. Institutional holdings surface here when ownership sources publish.
Section freshness
Price Jun 26, 4:00 PM EDT · Statements Mar 30, 8:00 PM EDT
Source timingDetailsHide
Data freshness
Prices update fastest. Fundamentals, analyst data, and news update on their own schedules, so check these timestamps before comparing signals.
Price time means the latest available trade or regular-market close. Other times show when that section was checked or published.
PriceLive
Last traded •
Source: Market data provider
Fundamentalsevery 1 hr
Provider checked •
Source: Market data provider
Analystevery 1 hr
Provider checked •
Source: Market data provider
Newsevery 15 min
Latest item •
Source: Market data provider
Ownership read
ONTO insider sentiment: Mixed, buy-heavy.
66 sales and 54 purchases appear in the recent Form 4 filings. Use the filters below to separate real buying and selling from option exercises, gifts, awards, and tax withholding.
Insider flow
ONTO
Purchases272.40K
Sales239.26K
Directional bars ignore awards, gifts, conversions, and tax withholding rows.
Top holder
—
Institutional data pending
Insider stance
Mixed, buy-heavy
$32.71M sold / — bought
Latest filing
May 20, 2026
Most recent holder or insider filing date
Filings shown
120
0 holder / 120 insider
- Holder rows
- Pending
- Market data source
- Latest filing
- May 20, 2026
- Most recent holder or insider filing date
- Increased / initiated
- Pending
- 0 decreased
- Insider rows
- 120
- Market data source
Recent insider transactions
Onto Innovation Inc (ONTO) Form 4 filings
Action codes are translated so open-market buys and sales are separate from awards, gifts, conversions, and tax withholding.
SEAMS, CHRISTOPHER A
Director
- Shares
- 761
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 20, 2026
LYNCH, SUSAN D
Director
- Shares
- 761
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 20, 2026
SU, MAY
Director
- Shares
- 761
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 20, 2026
SCHWARTZ, STEPHEN S
Director
- Shares
- 761
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 20, 2026
MILLER, DAVID BRIAN
Director
- Shares
- 761
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed May 20, 2026
YALDAEI, RAMIL
Chief Operating Officer
- Shares
- 218
- % company
- <0.01%
- Price
- $271.77
- Value
- $59,246
Filed May 15, 2026
YALDAEI, RAMIL
Chief Operating Officer
- Shares
- 625
- % company
- <0.01%
- Price
- $271.77
- Value
- $169,856
Filed May 15, 2026
OH, YOON AH
SVP, Gen Counsel & Corp Sec
- Shares
- 530
- % company
- <0.01%
- Price
- $271.77
- Value
- $144,038
Filed May 15, 2026
OH, YOON AH
SVP, Gen Counsel & Corp Sec
- Shares
- 417
- % company
- <0.01%
- Price
- $207.50
- Value
- $86,528
Filed Mar 3, 2026
PLISINSKI, MICHAEL P
Director, Chief Executive Officer
- Shares
- 3.74K
- % company
- <0.01%
- Price
- $207.50
- Value
- $776,465
Filed Mar 3, 2026
YALDAEI, RAMIL
Chief Operating Officer
- Shares
- 615
- % company
- <0.01%
- Price
- $207.50
- Value
- $127,613
Filed Mar 3, 2026
| # | Insider | % company | Action | Shares | Price | Value | Filing date |
|---|---|---|---|---|---|---|---|
| 1 | KELLEY, STEPHEN DOUGLAS Director | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 761 | Not reported | Not reported | May 20, 2026 |
| 2 | SEAMS, CHRISTOPHER A Director | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 761 | Not reported | Not reported | May 20, 2026 |
| 3 | LYNCH, SUSAN D Director | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 761 | Not reported | Not reported | May 20, 2026 |
| 4 | SU, MAY Director | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 761 | Not reported | Not reported | May 20, 2026 |
| 5 | SCHWARTZ, STEPHEN S Director | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 761 | Not reported | Not reported | May 20, 2026 |
| 6 | MILLER, DAVID BRIAN Director | <0.01% | PurchaseOpen-market or direct purchase reported on Form 4. | 761 | Not reported | Not reported | May 20, 2026 |
| 7 | YALDAEI, RAMIL Chief Operating Officer | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 218 | $271.77 | $59,246 | May 15, 2026 |
| 8 | YALDAEI, RAMIL Chief Operating Officer | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 625 | $271.77 | $169,856 | May 15, 2026 |
| 9 | OH, YOON AH SVP, Gen Counsel & Corp Sec | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 530 | $271.77 | $144,038 | May 15, 2026 |
| 10 | OH, YOON AH SVP, Gen Counsel & Corp Sec | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 417 | $207.50 | $86,528 | Mar 3, 2026 |
| 11 | PLISINSKI, MICHAEL P Director, Chief Executive Officer | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 3.74K | $207.50 | $776,465 | Mar 3, 2026 |
| 12 | YALDAEI, RAMIL Chief Operating Officer | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 615 | $207.50 | $127,613 | Mar 3, 2026 |
Showing 12 of 120 matching Form 4 rows. Percent of company uses current shares outstanding when available.Load more insiders
Frequently asked
Common questions.
Who are the largest ONTO shareholders?
Onto Innovation Inc (ONTO) institutional holders are ranked by reported share count when ownership data publishes filing rows.
What is institutional ownership of ONTO?
Onto Innovation Inc (ONTO) institutional ownership appears when filing-based market data returns holder rows. TECHi does not fill unavailable ownership fields with placeholder shareholders.
Where can I see Onto Innovation Inc insider transactions?
Onto Innovation Inc (ONTO) has 120 Form 4 insider transactions on file, most recently on May 20, 2026, separated into purchases, sales, option exercises, awards, gifts, and tax withholding so administrative transactions are distinguished from open-market trades.
Are ONTO insiders buying or selling?
Recent ONTO insider activity reads Mixed, buy-heavy: 66 sales and 54 purchases. Awards, gifts, conversions, and tax withholding are listed separately because they do not carry the same signal as open-market trades.
Who is the most active ONTO insider?
PLISINSKI, MICHAEL P is the most active ONTO insider by absolute share movement, with 321,101 shares moving across the filing history. Review the action labels before treating that activity as buying or selling.