What SEC filings does Onto Innovation Inc. submit to the SEC?

Onto Innovation Inc. (ONTO) submits several types of SEC filings including Form 4 (insider transactions), Form 144 (proposed insider sales), 8-K reports (material events such as earnings releases, acquisitions, leadership changes), and periodic reports — the 10-Q (quarterly) and 10-K (annual). All filings are publicly available through SEC EDGAR.

What does a Form 4 filing tell me about ONTO?

A Form 4 for ONTO discloses a transaction by a company insider — typically a director, officer, or 10%+ shareholder. It shows the source-reported date, number of shares, price, and updated ownership. These facts do not establish motive or predict future returns.

How do I interpret an 8-K filing from Onto Innovation Inc.?

An 8-K signals a material event requiring prompt disclosure. Common triggers include earnings pre-announcements, acquisitions, leadership appointments or departures, credit changes, or regulatory actions. Read the item codes inside the filing to understand exactly what was disclosed before drawing conclusions.

What is the difference between a 10-K and 10-Q for ONTO?

The 10-K is Onto Innovation Inc.'s annual report with fully audited financial statements, comprehensive MD&A, and complete risk factor disclosures — filed 60–90 days after fiscal year-end. The 10-Q is a lighter quarterly report with unaudited financials filed for the first three quarters. Together they provide a continuous financial picture of the company.

Where can I see all ONTO SEC filings directly on EDGAR?

You can view all historical Onto Innovation Inc. filings on the SEC EDGAR company page for ONTO. Each filing card on this page links directly to the original SEC document.

How often does Onto Innovation Inc. file with the SEC?

Onto Innovation Inc. files one 10-K per year and up to three 10-Qs per year. Form 4 insider transactions must be reported within two business days of each trade, so the frequency depends on how often insiders are buying or selling ONTO shares. 8-K filings occur whenever a material event happens — which can be several times per quarter for an active company.

ONTO SEC Filing News — Onto Innovation Inc.

Latest SEC filings for Onto Innovation Inc. (ONTO) explained in plain English. Covers insider buying and selling (Form 4), proposed insider sales (Form 144), material company events (8-K), and quarterly & annual reports (10-Q / 10-K). StrongBuyAnalytics provides navigation and brief excerpts or summaries; original filings remain at the SEC/source links and were authored by their filers, not StrongBuyAnalytics. Filing dates shown are source dates. Coverage and detection can be delayed or incomplete because of SEC availability, amendments, parsing, caching, or outages. Latest source filing date shown: 2026-10-01.

Onto Innovation Inc. engages in the design, development, manufacture, and support of process control tools that perform macro-defect inspection and metrology in the United States, Taiwan, South Korea, Japan, China, Southeast Asia, Asia, and Europe. The company offers lithography systems and process control analytical software; and automated and integrated metrology systems, silicon wafer all-surface inspection, macro defect inspection, automated defect classification and pattern analysis, yield …

Sector: Technology Industry: Semiconductor Equipment & Materials Market Cap: $11.1B CIK: 704532

Total Filings

Bullish Classifications

Bearish Classifications

Insider Transactions

Material Events (8-K)

Periodic Reports

Rule-based classifications for ONTO currently lean bearish. Of the 20 filing records displayed, 2 carry bearish classifications (such as insider sales or negative 8-K disclosures) versus 0 bullish. This does not necessarily signal fundamental deterioration — insiders sell for many reasons — but it is worth monitoring alongside the company's core financial metrics.

ONTO Filing Activity Snapshot 2026-05-18 — 2026-10-01

Insider Transactions (Form 4)

0 buys vs 2 sells

Net insider selling in this period — insiders sell for many reasons beyond conviction.

Largest Form 144 Filing

$600.0K

MILLER DAVID BRIAN (Director) · 2026-10-01

2,000 shares · Form 4

Form 144 Notices

Proposed insider sales filed — Form 144 is a notice of intent, not a confirmed transaction. Actual sales are confirmed via Form 4.

Insider Transactions 12 · Forms 3, 4 and 5

A Form 4 is filed within two business days of a company insider — an officer, a director, or a holder of more than ten percent of the stock — changing their position in the shares. All 12 filings in this group are Form 4s for Onto Innovation Inc.

The difficulty with reading these filings as a group is that a single form type covers transactions that mean entirely different things. An executive spending their own money to buy stock and an executive having shares withheld to pay tax on a vesting grant both appear as a Form 4. Every filing below is therefore tagged with the nature of the underlying transaction, taken from the transaction code reported on the form itself.

Across the 12 insider filings shown, the breakdown is 6 compensation award, 4 tax withholding and 2 open-market sale. 2 of them involved a discretionary open-market trade; the rest are compensation and administrative mechanics.

What each transaction type means

Compensation award ×6: Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.
Tax withholding ×4: Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.
Open-market sale ×2: The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Form 4 Open-market sale Insider Selling 2026-10-01

ONTO insider MILLER DAVID BRIAN (Director) sold 2,000 shares (~$600.0K)

MILLER DAVID BRIAN, listed as Director at ONTO INNOVATION INC., reported an open-market sale of 2,000 ONTO shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`S`	Open-market sale	2,000	$300.00	$600.0K

Filing: Form 4 (Insider Transaction) Insider: MILLER DAVID BRIAN (Director) Shares: 2,000 Est. Value: $600.0K

View on SEC EDGAR → Open Filing Document →

Form 4 Tax withholding Tax / Compensation Filing 2026-09-04

ONTO insider Form 4 filed for equity award, exercise, or tax withholding

ROBERTS BRIAN K (Chief Financial Officer) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`F`	Tax withholding on vested shares	3,239	$254.55	$824.5K

Filing: Form 4 (Insider Transaction) Insider: ROBERTS BRIAN K (Chief Financial Officer) Shares: 3,239

View on SEC EDGAR → Open Filing Document →

Form 4 Tax withholding Tax / Compensation Filing 2026-09-04

ONTO insider Form 4 filed for equity award, exercise, or tax withholding

Chen Shirley (Senior Vice President of Custo) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`F`	Tax withholding on vested shares	1,516	$254.55	$385.9K

Filing: Form 4 (Insider Transaction) Insider: Chen Shirley (Senior Vice President of Custo) Shares: 1,516

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market sale Insider Selling 2026-08-25

ONTO insider Lynch Susan D (Director) sold 1,000 shares (~$302.3K)

Lynch Susan D, listed as Director at ONTO INNOVATION INC., reported an open-market sale of 1,000 ONTO shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`S`	Open-market sale	1,000	$302.30	$302.3K

Filing: Form 4 (Insider Transaction) Insider: Lynch Susan D (Director) Shares: 1,000 Est. Value: $302.3K

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-05-22

ONTO insider Form 4 filed for equity award, exercise, or tax withholding

Su May (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award	761	—	—

Filing: Form 4 (Insider Transaction) Insider: Su May (Director) Shares: 761

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-05-22

ONTO insider Form 4 filed for equity award, exercise, or tax withholding

SEAMS CHRISTOPHER A (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award	761	—	—

Filing: Form 4 (Insider Transaction) Insider: SEAMS CHRISTOPHER A (Director) Shares: 761

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-05-22

ONTO insider Form 4 filed for equity award, exercise, or tax withholding

SCHWARTZ STEPHEN S (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award	761	—	—

Filing: Form 4 (Insider Transaction) Insider: SCHWARTZ STEPHEN S (Director) Shares: 761

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-05-22

ONTO insider Form 4 filed for equity award, exercise, or tax withholding

MILLER DAVID BRIAN (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award	761	—	—

Filing: Form 4 (Insider Transaction) Insider: MILLER DAVID BRIAN (Director) Shares: 761

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-05-22

ONTO insider Form 4 filed for equity award, exercise, or tax withholding

Lynch Susan D (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award	761	—	—

Filing: Form 4 (Insider Transaction) Insider: Lynch Susan D (Director) Shares: 761

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-05-22

ONTO insider Form 4 filed for equity award, exercise, or tax withholding

Kelley Stephen Douglas (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award	761	—	—

Filing: Form 4 (Insider Transaction) Insider: Kelley Stephen Douglas (Director) Shares: 761

View on SEC EDGAR → Open Filing Document →

Form 4 Tax withholding Tax / Compensation Filing 2026-05-18

ONTO insider Form 4 filed for equity award, exercise, or tax withholding

YALDAEI RAMIL (Chief Operating Officer) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`F`	Tax withholding on vested shares	218	$271.77	$59.2K
`F`	Tax withholding on vested shares	625	$271.77	$169.9K

Filing: Form 4 (Insider Transaction) Insider: YALDAEI RAMIL (Chief Operating Officer) Shares: 843

View on SEC EDGAR → Open Filing Document →

Form 4 Tax withholding Tax / Compensation Filing 2026-05-18

ONTO insider Form 4 filed for equity award, exercise, or tax withholding

OH Yoon Ah (SVP, Gen Counsel & Corp Sec) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`F`	Tax withholding on vested shares	530	$271.77	$144.0K

Filing: Form 4 (Insider Transaction) Insider: OH Yoon Ah (SVP, Gen Counsel & Corp Sec) Shares: 530

View on SEC EDGAR → Open Filing Document →

Proposed Insider Sales 2 · Form 144

A Form 144 is a notice of intent to sell restricted or control securities. It is not a record that anything was sold. Onto Innovation Inc. has 2 such notices in this period.

The distinction matters because a Form 144 is frequently reported as though it were a completed insider sale. The filer may sell all of the shares covered, some of them, or none at all, and there is no obligation to update the notice either way. A sale that is actually executed by an officer or director shows up separately on a Form 4, which is the filing to check before treating a proposed sale as a real one.

Form 144 Proposed Insider Sale 2026-09-29

ONTO Form 144 filed for proposed insider sale by DAVID B MILLER (2,000 shares) ~$600.0K

DAVID B MILLER filed a Form 144 with the SEC indicating intent to sell ONTO (ONTO INNOVATION INC.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: DAVID B MILLER Shares: 2,000 Est. Value: $600.0K

View on SEC EDGAR → Open Filing Document →

Form 144 Proposed Insider Sale 2026-08-21

ONTO Form 144 filed for proposed insider sale by SUSAN D LYNCH (1,000 shares) ~$302.3K

SUSAN D LYNCH filed a Form 144 with the SEC indicating intent to sell ONTO (ONTO INNOVATION INC.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: SUSAN D LYNCH Shares: 1,000 Est. Value: $302.3K

View on SEC EDGAR → Open Filing Document →

Material Events 5 · Form 8-K

An 8-K reports a material event in the window between scheduled reports. There are 5 in this period for Onto Innovation Inc. Each 8-K names the item number it is filed under, and that number is the fastest way to tell a routine disclosure from a consequential one.

Item 2.02 is an earnings release, Item 5.02 is a change of directors or officers, and Item 1.01 or 2.01 covers a material agreement or a completed acquisition. Item 7.01 and Item 8.01 are the general-purpose disclosure items and carry no fixed meaning on their own.

Form 8-K Material Company Update 2026-08-10

ONTO filed 8-K — material company event

ONTO INNOVATION INC. filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Form 8-K Material Company Update 2026-08-06

ONTO filed 8-K — material company event

ONTO INNOVATION INC. filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Form 8-K Material Company Update 2026-05-21

ONTO filed 8-K — material company event

ONTO INNOVATION INC. filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Form 8-K Material Company Update 2026-05-20

ONTO filed 8-K — material company event

ONTO INNOVATION INC. filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Form 8-K Material Company Update 2026-05-18

ONTO filed 8-K — material company event

ONTO INNOVATION INC. filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Periodic Reports 1 · Forms 10-K and 10-Q

The periodic reports are where the audited and reviewed financial statements live. This period contains 1 quarterly report (10-Q) for Onto Innovation Inc.

The two are not equivalent in weight. A 10-K is audited by an external firm and includes the full risk factor disclosure, business description and management discussion; a 10-Q is unaudited, reviewed rather than examined, and much shorter. When a figure in a quarterly report is later revised, the annual report is usually where the correction appears.

An amended report — 10-K/A or 10-Q/A — restates or corrects something in the original filing, and is worth reading against the version it replaces.

Form 10-Q Quarterly Report 2026-08-06

ONTO filed Quarterly Report (10-Q)

ONTO INNOVATION INC. filed its quarterly report with the SEC. This report includes unaudited financial statements and management discussion for the quarter.

Filing: 10-Q (Quarterly Report)

View on SEC EDGAR → Open Filing Document →

How we classify Onto Innovation Inc.'s filings

Straight from EDGAR

Each displayed record links to an original source document. StrongBuyAnalytics provides navigation and brief excerpts or summaries, not the filing itself. Parsing may omit context or contain errors, so read the original document in full.

Transaction codes, not guesswork

The nature shown on each insider filing comes from the transaction code the filer entered on the form itself — P for an open-market purchase, A for a compensation award, F for shares withheld to pay tax, M for an option exercise. Where one filing contains several codes, the transaction table lists them line by line.

Why the distinction matters

Insider activity is routinely summarised as buying or selling, which flattens together decisions that mean very different things. Shares withheld for tax on a vesting grant are an automatic administrative step; shares bought on the open market are someone committing their own money at the current price.

What this page does not tell you

A filing records what happened, not why. Form 4 does not always disclose whether a sale was executed under a pre-arranged Rule 10b5-1 plan, and no single filing is a basis for a decision on ONTO. Read these alongside the fundamentals rather than in isolation.

Frequently Asked Questions — ONTO SEC Filings

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ONTO Full Analysis

Publisher, sources & limitations — September 15, 2026. StrongBuyAnalytics provides navigation and brief excerpts or summaries for educational use. Original filings remain at SEC EDGAR or other displayed source links; StrongBuyAnalytics does not author them. Filing dates are source dates, not publication dates for this page. Coverage can be delayed, incomplete, amended, or unavailable because of SEC/source availability, parsing, caching, or outages. Verify every material statement in the original filing.

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