SEC ownership of ONTO INNOVATION INC.

Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0000704532.

Comparable stake leader

BlackRock, Inc.

Disclosed value leader

BlackRock, Inc.

Comparable rows

50/50

Latest evidence

21 Aug 2026

Top shareholders Insider holders Latest transactions
Public ticker
ONTO on NYSE
Parsed ownership sources
13F, 13D/G, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
Largest SEC-reported holder
BlackRock, Inc.
Ranking: Comparable ownership first, then disclosed value
Ownership snapshot CIK-linked ownership evidence from parsed SEC filings. 3 signals
Comparable ownership rows
50 of 50
Meaning: Rows with safely comparable ownership %
Latest 13D/G holder
BlackRock, Inc.
Source: Latest parsed Schedule 13D/G stake
Latest parsed ownership date
21 Aug 2026
Freshness: Most recent filing date in this holder set
Issuer Names, identifiers, and filing context for this profile. 2 identity fields
Issuer CIK
0000704532
Issuer location
Wilmington, MA

Ownership snapshot

Top shareholders of ONTO INNOVATION INC. (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Comparable stake leader
BlackRock, Inc.
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
21 Aug 2026
13F 13D/G 3/4/5 Lead comparable stake: 10% 13D/G row: BlackRock, Inc. Showing 1-8 of 50 holder rows.

Quick read

BlackRock, Inc. leads the comparable SEC ownership view at 10%.

50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.

Open SEC evidence Opens BlackRock, Inc.'s linked filing trail.
Comparable ownership Top 5
BlackRock, Inc. 10%
VANGUARD PORTFOLIO MANAGEMENT LLC 5.5%
VANGUARD CAPITAL MANAGEMENT LLC 5.2%
Christopher A. Seams 0.08%
David Brian Miller 0.03%

Ownership % is shown only when SEC disclosures are safely comparable across share classes.

Detailed SEC evidence table Showing 1-8 of 50 holder rows
Holder Evidence Ownership % Position 12M Net Δ As of
BlackRock, Inc.
13F 13D/G
Company
13F 13D/G
10%
from 13D/G
$2,083,436,125
5,505,181 shares
 — 30 Jun 2026
VANGUARD PORTFOLIO MANAGEMENT LLC
13F 13D/G
Company · Vanguard Portfolio Management
13F 13D/G
5.5%
from 13D/G
$1,032,377,540
2,727,910 shares
 — 30 Jun 2026
VANGUARD CAPITAL MANAGEMENT LLC
13F 13D/G
Company · Vanguard Capital Management
13F 13D/G
5.2%
from 13D/G
$850,656,068
2,247,737 shares
 — 30 Jun 2026
Christopher A. Seams
3/4/5
Director
3/4/5
0.08%
$7,897,860
38,513 shares
 — 20 May 2026
David Brian Miller
3/4/5
Director
3/4/5
0.03%
$2,602,748
12,692 shares
 — 20 May 2026
May Su
3/4/5
Director
3/4/5
0.02%
$1,637,278
7,984 shares
 — 20 May 2026
Stephen Douglas Kelley
3/4/5
Director
3/4/5
0.01%
$1,309,166
6,384 shares
 — 20 May 2026
Stephen S. Schwartz
3/4/5
Director
3/4/5
0.01%
$725,127
3,536 shares
 — 20 May 2026
How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

Forms 3/4/5 flow

Insider trading overview

Net insider flow leans to selling over the last 12 months. Net value: -$302,300.

Buys
$0
Insiders: 0
Sells
$302,300
Insiders: 1
Net
-$302,300
Shares: -1,000
Window
Last 12 months
4 rolling buckets
Buy value Sell value
Shares: 0 Shares: 1,000
Window (months) Buy shares Sell shares Buy value Sell value Net value
0-3 0 1,000 $0 $302,300 -$302,300
3-6 0 0 $0 $0 $0
6-9 0 0 $0 $0 $0
9-12 0 0 $0 $0 $0

Reporting owners

Insider holders from Forms 3/4/5

Showing 1-20 of 32 reporting-owner rows connected to ONTO INNOVATION INC.. Open a relationship link for the CIK-to-CIK filing trail.

Rows
32
Largest Forms 3/4/5 holder
Michael P. Plisinski
Net 12M change
-$302,300
Latest report
02 Sep 2026
Name Relationship Holdings Value Past Year Net Change Change % Valuation Report Date
Michael P. Plisinski Chief Executive Officer, Director $39,062,487 Mixed 02 Mar 2026
Christine A. Tsingos Director $9,592,173 Mixed 21 May 2025
Brian K. Roberts Chief Financial Officer $7,959,560 Median 02 Sep 2026
Christopher A. Seams Director $7,897,860 Mixed 20 May 2026
Ido Dolev EVP, Prod Solutions Grp $5,532,756 Mixed 02 Mar 2026
Shirley Chen Senior Vice President of Custo $5,298,678 Median 02 Sep 2026
Edward J. Brown Jr. Director $4,973,187 Mixed 10 May 2022
Yoon Ah Oh SVP, Gen Counsel & Corp Sec $4,543,147 Mixed 15 May 2026
Leo Berlinghieri Director $4,516,935 Mixed 21 May 2025
Ramil Yaldaei Chief Operating Officer $3,882,219 Mixed 15 May 2026
Rollin Kocher Sr VP, Field Operations $3,767,879 Mixed 06 Sep 2021
Rodney Smedt Svp & Gm, Mbu $3,556,898 Mixed 26 Jan 2022
Srinivas Vedula SVP Customer Success $2,915,531 Mixed 09 Apr 2025
Steven R. Roth Sr VP & CFO $2,801,413 Mixed 17 May 2022
David Brian Miller Director $2,602,748 Mixed 20 May 2026
Kevin Heidrich SVP, Marketing & Corp Develop $2,275,445 Mixed 18 Jan 2022
May Su Director $1,637,278 Mixed 20 May 2026
Robert Fiordalice Sr. Vice President & GM, MBU $1,584,028 Mixed 01 Dec 2024
Mark R. Slicer Chief Financial Officer $1,569,936 Mixed 12 Jun 2025
Stephen Douglas Kelley Director $1,309,166 Mixed 20 May 2026

Recent insider transactions for ONTO INNOVATION INC.

Showing up to 300 recent insider transactions from the last 12 months.

Insider Symbol Class Transaction % SEC-reported value SEC-reported price Shares Shares owned Date Ownership
Brian K. Roberts ONTO Common Stock Tax liability -13.4% -3,239 21,032 02 Sep 2026 Direct
Shirley Chen ONTO Common Stock Tax liability -9.77% -1,516 14,001 02 Sep 2026 Direct
Brian K. Roberts ONTO Common Stock Tax liability -13.4% -3,239 21,032 02 Sep 2026 Direct
Susan D. Lynch ONTO Common Stock Sale -27.1% $302,300 $302.30 -1,000 2,684 21 Aug 2026 Direct
May Su ONTO Common Stock Award 10.5% 761 7,984 20 May 2026 Direct
Christopher A. Seams ONTO Common Stock Award 2.02% 761 38,513 20 May 2026 Direct
Stephen S. Schwartz ONTO Common Stock Award 27.4% 761 3,536 20 May 2026 Direct
David Brian Miller ONTO Common Stock Award 6.38% 761 12,692 20 May 2026 Direct
Susan D. Lynch ONTO Common Stock Award 26% 761 3,684 20 May 2026 Direct
Stephen Douglas Kelley ONTO Common Stock Award 13.5% 761 6,384 20 May 2026 Direct
Ramil Yaldaei ONTO Common Stock Tax liability -4.57% -843 17,593 15 May 2026 Direct
Yoon Ah Oh ONTO Common Stock Tax liability -2.45% -530 21,110 15 May 2026 Direct
Ido Dolev ONTO Common Stock Tax liability -2.99% -819 26,536 03 Mar 2026 Direct
Ramil Yaldaei ONTO Common Stock Tax liability -3.23% -615 18,436 03 Mar 2026 Direct
Michael P. Plisinski ONTO Common Stock Tax liability -2.04% -3,742 179,242 03 Mar 2026 Direct
Yoon Ah Oh ONTO Common Stock Tax liability -1.89% -417 21,640 03 Mar 2026 Direct
Brian K. Roberts ONTO Common Stock Award 14.6% 3,096 24,271 02 Mar 2026 Direct
Brian K. Roberts ONTO Performance Stock Unit Award 3,096 1,548 02 Mar 2026 Direct
Ido Dolev ONTO Common Stock Award 14.4% 3,440 27,355 02 Mar 2026 Direct
Ido Dolev ONTO Performance Stock Unit Award 3,440 1,720 02 Mar 2026 Direct
Ramil Yaldaei ONTO Common Stock Award 67.6% 7,683 19,051 02 Mar 2026 Direct
Ramil Yaldaei ONTO Performance Stock Unit Award 3,096 1,548 02 Mar 2026 Direct
Michael P. Plisinski ONTO Common Stock Award 8.59% 14,479 182,984 02 Mar 2026 Direct
Michael P. Plisinski ONTO Performance Stock Unit Award 14,478 7,239 02 Mar 2026 Direct
Yoon Ah Oh ONTO Common Stock Award 12.3% 2,408 22,057 02 Mar 2026 Direct
Yoon Ah Oh ONTO Performance Stock Unit Award 2,408 1,204 02 Mar 2026 Direct
Shirley Chen ONTO Common Stock Award 19.4% 2,523 15,517 02 Mar 2026 Direct
Shirley Chen ONTO Performance Stock Unit Award 2,522 1,261 02 Mar 2026 Direct
Ramil Yaldaei ONTO Common Stock Tax liability -5.2% -623 11,368 01 Mar 2026 Direct
Ramil Yaldaei ONTO Common Stock Options Exercise 5.72% 649 11,991 01 Mar 2026 Direct
Ramil Yaldaei ONTO Performance Stock Unit Options Exercise -100% -844 0 01 Mar 2026 Direct
Michael P. Plisinski ONTO Common Stock Tax liability -2.4% -4,147 168,505 01 Mar 2026 Direct
Michael P. Plisinski ONTO Common Stock Options Exercise 2.74% 4,597 172,652 01 Mar 2026 Direct
Michael P. Plisinski ONTO Performance Stock Unit Options Exercise -100% -5,971 0 01 Mar 2026 Direct
Yoon Ah Oh ONTO Common Stock Tax liability -2.84% -574 19,649 01 Mar 2026 Direct
Yoon Ah Oh ONTO Common Stock Options Exercise 3.71% 724 20,223 01 Mar 2026 Direct
Yoon Ah Oh ONTO Performance Stock Unit Options Exercise -100% -941 0 01 Mar 2026 Direct
Michael P. Plisinski ONTO Common Stock Tax liability -6.95% -12,551 168,055 14 Feb 2026 Direct
Michael P. Plisinski ONTO Common Stock Options Exercise 11.4% 18,445 180,606 14 Feb 2026 Direct
Michael P. Plisinski ONTO Performance Stock Unit Options Exercise -100% -11,824 0 14 Feb 2026 Direct
Yoon Ah Oh ONTO Common Stock Tax liability -7.56% -1,595 19,499 14 Feb 2026 Direct
Yoon Ah Oh ONTO Common Stock Options Exercise 17.1% 3,084 21,094 14 Feb 2026 Direct
Yoon Ah Oh ONTO Performance Stock Unit Options Exercise -100% -1,977 0 14 Feb 2026 Direct
Michael P. Plisinski ONTO Common Stock Gift -13.4% -25,000 162,161 24 Dec 2025 Direct
Ido Dolev ONTO Common Stock Tax liability -11.8% -3,183 23,915 02 Dec 2025 Direct
Ramil Yaldaei ONTO Common Stock Tax liability -4.98% -594 11,342 03 Oct 2025 Direct
* marks a reported price that did not pass the local price check.
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