Yoon Ah Oh

Insider

First SEC filing: March 18, 2024 · Latest: March 18, 2024

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Insider at Companies where this person is a reporting insider.
Insider transactions Every share this person bought or sold, from Form 4 filings.
Derivatives Options and other derivative holdings reported by this person.
Compensation Executive pay disclosed in company proxy statements.

Insider at

ONTO selling March 18, 2024

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 18 non-open-market transactions below last 12 months, based on the transactions shown below

Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted

18 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
March 18, 2024	ONTO	S 10b5-1	1,685	$180.00	$303,300	14,913 Direct	-10.15%	Disposed	67.2% (price as of 2026-08-21)
March 15, 2024	ONTO	S 10b5-1	2,685	$173.96	$467,083	16,598 Direct	-13.92%	Disposed	73.0% (price as of 2026-08-21)
March 1, 2024	ONTO	A	1,883	—	—	19,283 Direct	+10.82%	Acquired	(price as of 2026-08-21)
March 1, 2024	ONTO	A	941	—	—	941 Direct	—	Acquired	(price as of 2026-08-21)
March 1, 2024	ONTO	A	941	—	—	941 Direct	—	Acquired	(price as of 2026-08-21)
Feb. 14, 2024	ONTO	F	493	$173.08	$85,328	17,400 Direct	-2.76%	Disposed	73.9% (price as of 2026-08-21)
Feb. 10, 2024	ONTO	F	1,395	$180.01	$251,114	15,171 Direct	-8.42%	Disposed	67.2% (price as of 2026-08-21)
Feb. 10, 2024	ONTO	M	2,722	—	—	17,893 Direct	+17.94%	Acquired	(price as of 2026-08-21)
Feb. 10, 2024	ONTO	M	1,361	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
Oct. 25, 2023	ONTO	F	795	$111.16	$88,372	16,566 Direct	-4.58%	Disposed	170.8% (price as of 2026-08-21)
May 15, 2023	ONTO	A	3,746	—	—	17,361 Direct	+27.51%	Acquired	(price as of 2026-08-21)
Feb. 14, 2023	ONTO	A	3,955	—	—	13,615 Direct	+40.94%	Acquired	(price as of 2026-08-21)
Feb. 14, 2023	ONTO	A	1,978	—	—	1,978 Direct	—	Acquired	(price as of 2026-08-21)
Feb. 14, 2023	ONTO	A	1,977	—	—	1,977 Direct	—	Acquired	(price as of 2026-08-21)
Feb. 10, 2023	ONTO	F	318	$80.90	$25,726	9,660 Direct	-3.19%	Disposed	272.1% (price as of 2026-08-21)
Oct. 25, 2022	ONTO	F	787	$67.30	$52,965	9,978 Direct	-7.31%	Disposed	347.3% (price as of 2026-08-21)
Feb. 10, 2022	ONTO	A	2,722	—	—	10,765 Direct	+33.84%	Acquired	(price as of 2026-08-21)
Feb. 10, 2022	ONTO	A	1,361	—	—	1,361 Direct	—	Acquired	(price as of 2026-08-21)
Feb. 10, 2022	ONTO	A	1,360	—	—	1,360 Direct	—	Acquired	(price as of 2026-08-21)
Oct. 25, 2021	ONTO	A	8,043	—	—	8,043 Direct	—	Acquired	(price as of 2026-08-21)

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.

Date	Ticker	Security	Underlying	Exercise price	Expiration	Shares	A/D
March 1, 2024	ONTO	Performance Stock Unit	Common Stock (941)	—	March 1, 2026	941	Acquired
March 1, 2024	ONTO	Performance Stock Unit	Common Stock (941)	—	March 1, 2027	941	Acquired
Feb. 10, 2024	ONTO	Performance Stock Unit	Common Stock (1,361)	—	Feb. 10, 2024	1,361	Disposed
Feb. 14, 2023	ONTO	Performance Stock Unit	Common Stock (1,978)	—	Feb. 14, 2025	1,978	Acquired
Feb. 14, 2023	ONTO	Performance Stock Unit	Common Stock (1,977)	—	Feb. 14, 2026	1,977	Acquired
Feb. 10, 2022	ONTO	Performance Stock Unit	Common Stock (1,361)	—	Feb. 10, 2024	1,361	Acquired
Feb. 10, 2022	ONTO	Performance Stock Unit	Common Stock (1,360)	—	Feb. 10, 2025	1,360	Acquired

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

Compensation (DEF 14A)

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

ONTO

Fiscal year	Salary	Bonus	Stock awards	Option awards	Non-equity incentive	Pension change	Other	Total
2024	$406,587	—	$835,998	—	$281,996	—	$10,829	$1,535,410
2023	$370,067	—	$1,073,669	—	$191,900	—	$10,590	$1,646,226
2022	$359,288	—	$568,303	—	$206,287	—	$9,490	$1,143,368

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