Mark N. Rogers - 18 Feb 2026 Form 4 Insider Report for AMKOR TECHNOLOGY, INC. (AMKR)

Role: EVP & General Counsel
Signature: /s/ Mark N. Rogers
Issuer symbol: AMKR
Transactions as of: 18 Feb 2026
Net transactions value: -$129,797
Form type: 4
Filing time: 20 Feb 2026, 16:15:37 UTC
Previous filing: 18 Feb 2026
Next filing: 24 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
ROGERS MARK N	EVP & General Counsel	2045 EAST INNOVATION CIRCLE, TEMPE	/s/ Mark N. Rogers	20 Feb 2026	0001201997

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	AMKR	Common Stock	Award	$0	+2,003	+8%	$0.000000	26,925	18 Feb 2026	Direct	F1
transaction	AMKR	Common Stock	Tax liability	$40,150	-859	-3.2%	$46.74	26,066	18 Feb 2026	Direct	F2
transaction	AMKR	Common Stock	Award	$0	+4,475	+17%	$0.000000	30,541	18 Feb 2026	Direct	F3
transaction	AMKR	Common Stock	Tax liability	$89,647	-1,918	-6.3%	$46.74	28,623	18 Feb 2026	Direct	F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	AMKR	Restricted Stock Units	Award	$0	+14,976		$0.000000	14,976	18 Feb 2026	Common Stock	14,976	$0.000000	Direct	F4

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	This Form 4 reports the vesting on February 18, 2026 of 2,003 shares of common stock of Amkor Technology, Inc. (the "Issuer") underlying performance-vested restricted stock units ("PSUs") granted to the Reporting Person on February 20, 2024 pursuant to the Issuer's Equity Incentive Plan, as amended, and the related award agreement. The PSUs vested based on the attainment of a basic earnings per share performance goal over a one-year performance period beginning January 1, 2025 and ending on December 31, 2025.
F2	The transaction represents shares of the Issuer's common stock withheld by the Issuer in connection with the vesting of PSUs to satisfy the Reporting Person's tax withholding obligations. The Issuer will pay these taxes on behalf of the Reporting Person.
F3	The transaction represents the vesting on February 18, 2026 of 4,475 shares of common stock of the Issuer's underlying PSUs granted to the Reporting Person on February 20, 2025 pursuant to the Issuer's Equity Incentive Plan, as amended, and the related award agreement. The PSUs vested based on the attainment of a basic earnings per share performance goal over a one-year performance period beginning January 1, 2025 and ending on December 31, 2025.
F4	Represents shares of the Issuer's common stock underlying time-vested restricted stock units granted on February 18, 2026 (the "Grant Date") pursuant to the Issuer's Equity Incentive Plan (the "RSUs"). The RSUs were awarded for no consideration other than the Reporting Person's service as an officer of the Issuer and will vest in three equal annual installments beginning on the first anniversary of the Grant Date and annually thereafter, such that 100% will be vested on the third anniversary of the Grant Date.