NYSE · Technology · Holders

Onto Innovation (ONTO) Institutional Ownership & Insider Trading History

Q: Who are the largest ONTO shareholders?

Blackrock Inc. is the largest reported institutional holder of ONTO, with 5.51 million shares, or about 11.22% of shares outstanding.

Q: What does the institutional filing activity show for ONTO?

Onto Innovation has 10 institutional rows on file. Previous position sizes are unavailable, so increases and reductions cannot be determined.

Q: What insider transactions are available for ONTO?

TECHi shows 47 dated ONTO insider transactions through Sep 29, 2026, with transaction types kept separate so administrative actions are not presented as open-market trades.

Q: Are ONTO insiders buying or selling?

The displayed ONTO activity reads Net selling: 8 sales and 0 purchases. Other transaction types remain separate.

Q: Who is the most active reported ONTO insider?

PLISINSKI MICHAEL P has the largest absolute share movement in the displayed ONTO filing rows, totaling 213,431 shares. The action labels provide the transaction context.

Top ONTO institutional shareholders, filing changes, and Form 4 insider activity with filters for buys, sales, option exercises, gifts, and tax withholding.

Last confirmed price: $198.68+0.01%; Oct 23, 2026, 4:00 PM EDT · Prices may be delayed
Market cap · last reported: $9.75B; Oct 25, 2026 · Valuation and sources

Data dates

Prices as of Oct 23, 4:00 PM EDT · Fundamentals checked Oct 24, 10:54 PM EDT · Statement period ended Jun 30, 2026

Ownership read

ONTO insider transaction activity: Net selling.

Blackrock Inc. is the largest institutional holder. 8 classified sales and 0 classified purchases appear in the recent insider records. 12 transactions lack a reliable action code. Use the filters below to separate open-market activity from option exercises, gifts, awards, and tax withholding.

Review insider trades View institutions

Insider flow

ONTO

Purchases0

Sales90.17K

Directional bars ignore awards, gifts, conversions, and tax withholding rows.

Top holder

5.51M

Blackrock Inc.

Insider transaction activity

Net selling

$19.3M sold / $0.0000 bought · 12 unclassified

Observations shown

10 holder / 47 insider

Increased / initiated: Unavailable; Prior positions were not supplied

Insider rows: 47; Transaction dates shown per row

Ownership concentration and transaction activity

Top 10 reported holders: 37.96% outstanding
Changes with share-count history: Prior-position data unavailable
New / exited positions: Prior-position data unavailable
Largest increase with share-count history: Prior share counts unavailable

These changes cover the holders shown. A holder missing from this list may still own shares. Compare positions from the same reporting quarters.

Net shares sold: 90,165

Sale-code S shares minus purchase-code P shares in this sample. Includes disclosed plans and unknown plan status; excludes grants, gifts, exercises and withholding. This is activity, not sentiment.

Purchase / sale; plan unknown: 8
Grant: 26
Other / unclassified: 12
Gift: 1

Top 10 institutional holders

Onto Innovation (ONTO) institutional ownership

Ranked by reported share count, with position changes and separate position and filing dates where ownership data supplies them.

Onto Innovation (ONTO) institutional ownership
#	Institution	% held	Shares	Position / filing date
1	Blackrock Inc.	11.2%	5.51M	Position as of Jun 30, 2026Filing date unknown
2	Vanguard Portfolio Management LLC	5.56%	2.73M	Position as of Jun 30, 2026Filing date unknown
3	Vanguard Capital Management LLC	4.58%	2.25M	Position as of Jun 30, 2026Filing date unknown
4	State Street Corporation	3.17%	1.55M	Position as of Jun 30, 2026Filing date unknown
5	Geode Capital Management, LLC	2.92%	1.43M	Position as of Jun 30, 2026Filing date unknown
6	Invesco Ltd.	2.75%	1.35M	Position as of Jun 30, 2026Filing date unknown
7	Paradigm Capital Management	2.24%	1.10M	Position as of Jun 30, 2026Filing date unknown
8	Point72 Asset Management, L.P.	1.98%	972.16K	Position as of Jun 30, 2026Filing date unknown
9	FMR, LLC	1.80%	883.30K	Position as of Jun 30, 2026Filing date unknown
10	Price (T.Rowe) Associates Inc	1.74%	853.31K	Position as of Jun 30, 2026Filing date unknown

Showing 10 of 10 matching institutional rows.

Recent insider transactions

Onto Innovation (ONTO) Form 4 filings

Action codes are translated so open-market buys and sales are separate from awards, gifts, conversions, and tax withholding. Window: Nov 15, 2024–Sep 29, 2026 · 47 records.

Onto Innovation (ONTO) Form 4 insider transactions
#	Insider	% company	Action	Shares	Price	Value	Transaction / filing
1	MILLER DAVID B Director	<0.01%	SaleOpen-market or direct sale reported on Form 4. Transaction context Classification: Purchase / sale; plan unknown 10b5-1: Not reported Holdings after: Not reported Position sold: Not calculable Filed: Not reported Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.	2.00K	$300.00	$600,000	Sep 29, 2026Filing date unavailableOriginal filing link unavailable
2	LYNCH SUSAN D. Director	<0.01%	SaleOpen-market or direct sale reported on Form 4. Transaction context Classification: Purchase / sale; plan unknown 10b5-1: Not reported Holdings after: Not reported Position sold: Not calculable Filed: Not reported Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.	1.00K	$302.30	$302,300	Aug 21, 2026Filing date unavailableOriginal filing link unavailable
3	SCHWARTZ STEPHEN S Director	<0.01%	Award / grantAward, grant, or acquisition under an equity compensation plan. Transaction context Classification: Grant 10b5-1: Not reported Holdings after: Not reported Position sold: Not calculable Filed: Not reported Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.	761	No cash value	No cash value	May 20, 2026Filing date unavailableOriginal filing link unavailable
4	MILLER DAVID B Director	<0.01%	Award / grantAward, grant, or acquisition under an equity compensation plan. Transaction context Classification: Grant 10b5-1: Not reported Holdings after: Not reported Position sold: Not calculable Filed: Not reported Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.	761	No cash value	No cash value	May 20, 2026Filing date unavailableOriginal filing link unavailable
5	SEAMS CHRISTOPHER A Director	<0.01%	Award / grantAward, grant, or acquisition under an equity compensation plan. Transaction context Classification: Grant 10b5-1: Not reported Holdings after: Not reported Position sold: Not calculable Filed: Not reported Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.	761	No cash value	No cash value	May 20, 2026Filing date unavailableOriginal filing link unavailable
6	KELLEY STEPHEN DOUGLAS Director	<0.01%	Award / grantAward, grant, or acquisition under an equity compensation plan. Transaction context Classification: Grant 10b5-1: Not reported Holdings after: Not reported Position sold: Not calculable Filed: Not reported Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.	761	No cash value	No cash value	May 20, 2026Filing date unavailableOriginal filing link unavailable
7	LYNCH SUSAN D. Director	<0.01%	Award / grantAward, grant, or acquisition under an equity compensation plan. Transaction context Classification: Grant 10b5-1: Not reported Holdings after: Not reported Position sold: Not calculable Filed: Not reported Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.	761	No cash value	No cash value	May 20, 2026Filing date unavailableOriginal filing link unavailable
8	SU MAY Director	<0.01%	Award / grantAward, grant, or acquisition under an equity compensation plan. Transaction context Classification: Grant 10b5-1: Not reported Holdings after: Not reported Position sold: Not calculable Filed: Not reported Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.	761	No cash value	No cash value	May 20, 2026Filing date unavailableOriginal filing link unavailable
9	ROBERTS BRIAN K Chief Financial Officer	<0.01%	Award / grantAward, grant, or acquisition under an equity compensation plan. Transaction context Classification: Grant 10b5-1: Not reported Holdings after: Not reported Position sold: Not calculable Filed: Not reported Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.	3.10K	No cash value	No cash value	Mar 2, 2026Filing date unavailableOriginal filing link unavailable
10	PLISINSKI MICHAEL P Chief Executive Officer	0.03%	Award / grantAward, grant, or acquisition under an equity compensation plan. Transaction context Classification: Grant 10b5-1: Not reported Holdings after: Not reported Position sold: Not calculable Filed: Not reported Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.	14.48K	No cash value	No cash value	Mar 2, 2026Filing date unavailableOriginal filing link unavailable
11	OH YOON AH General Counsel	<0.01%	Award / grantAward, grant, or acquisition under an equity compensation plan. Transaction context Classification: Grant 10b5-1: Not reported Holdings after: Not reported Position sold: Not calculable Filed: Not reported Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.	2.41K	No cash value	No cash value	Mar 2, 2026Filing date unavailableOriginal filing link unavailable
12	YALDAEI RAMIL Chief Operating Officer	0.02%	Award / grantAward, grant, or acquisition under an equity compensation plan. Transaction context Classification: Grant 10b5-1: Not reported Holdings after: Not reported Position sold: Not calculable Filed: Not reported Position sold = shares sold ÷ (shares sold + holdings after). Separate accounts or security classes may not represent total beneficial ownership.	7.68K	No cash value	No cash value	Mar 2, 2026Filing date unavailableOriginal filing link unavailable

Showing 12 of 47 matching Form 4 rows. Percent of company uses current shares outstanding.

Frequently asked

Questions about this quote

Who are the largest ONTO shareholders?

Blackrock Inc. is the largest reported institutional holder of ONTO, with 5.51 million shares, or about 11.22% of shares outstanding.

What does the institutional filing activity show for ONTO?

Onto Innovation has 10 institutional rows on file. Previous position sizes are unavailable, so increases and reductions cannot be determined.

What insider transactions are available for ONTO?

TECHi shows 47 dated ONTO insider transactions through Sep 29, 2026, with transaction types kept separate so administrative actions are not presented as open-market trades.

Are ONTO insiders buying or selling?

The displayed ONTO activity reads Net selling: 8 sales and 0 purchases. Other transaction types remain separate.

Who is the most active reported ONTO insider?

PLISINSKI MICHAEL P has the largest absolute share movement in the displayed ONTO filing rows, totaling 213,431 shares. The action labels provide the transaction context.

What this page answers

Check who owns the float and whether insiders are active.

Explore Institutional concentration, insider transaction pattern, and float context.

Keep in mind Filings are delayed or transactions are administrative rather than economic.

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