Shirley Chen — SEC Insider Profile, Roles & Companies

Insider at

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Insider transactions

05

0 buys (P) 0 sells (S) Net: $0 + 5 non-open-market transactions below 12 months to the week close of 2026-10-16

Price change vs the latest weekly close (updated to the current quote in your browser when available), split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted

No open-market trades on record; showing all filings.

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
Sept. 2, 2026	ONTO	F	1,516	$254.55	$385,898	14,001 Direct	-9.77%	Disposed	-13.3% (price as of 2026-10-16)
March 2, 2026	ONTO	A	2,523	·	·	15,517 Direct	+19.42%	Acquired
March 2, 2026	ONTO	A	1,261	·	·	1,261 Direct	·	Acquired
March 2, 2026	ONTO	A	1,261	·	·	1,261 Direct	·	Acquired
Sept. 2, 2025	ONTO	A	12,994	·	·	12,994 Direct	·	Acquired

P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding

Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.

Derivative holdings (Form 4 Table II) Options, RSUs and convertible securities reported on Form 4 Table II.

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Date	Ticker	Security	Underlying	Exercise price	Expiration	Shares	A/D
March 2, 2026	ONTO	Performance Stock Unit	Common Stock (1,261)	·	March 2, 2028	1,261	Acquired
March 2, 2026	ONTO	Performance Stock Unit	Common Stock (1,261)	·	March 2, 2029	1,261	Acquired

Exercise/conversion price is blank when not applicable (e.g. RSUs).

Compensation (DEF 14A)

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Matched by name from proxy statements (DEF 14A) — verify against the filing.

ONTO

President, Customer Success

Fiscal year	Salary	Bonus	Stock awards	Option awards	Non-equity incentive	Pension change	Other	Total
2025	$224,192	·	$1,350,077	·	$236,738	·	$5,394	$1,816,401

Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.