Guillaume Marie Jean Rutten - 31 Dec 2025 Form 4 Insider Report for AMKOR TECHNOLOGY, INC. (AMKR)

Role
President and CEO, Director
Signature
/s/ Mark N. Rogers, Attorney-in-Fact for Guillaume Marie Jean Rutten
Issuer symbol
AMKR
Transactions as of
31 Dec 2025
Net transactions value
$0
Form type
4
Filing time
05 Jan 2026, 16:16:42 UTC
Previous filing
17 Dec 2025
Next filing
20 Jan 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Rutten Guillaume Marie Jean President and CEO, Director 2045 EAST INNOVATION CIRCLE, TEMPE /s/ Mark N. Rogers, Attorney-in-Fact for Guillaume Marie Jean Rutten 05 Jan 2026 0001596796

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction AMKR Common Stock Options Exercise $0 +8,692 +2.6% $0.000000 345,391 31 Dec 2025 Direct

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 Options Exercise $0 -8,692 -33% $0.000000 17,384 31 Dec 2025 Common Stock 8,692 $0.000000 Direct F1
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 On February 20, 2025, the Reporting Person was granted 43,459 restricted stock units which vest in five equal quarterly installments on each of June 30, 2025, September 30, 2025, December 31, 2025, March 31, 2026, and June 30, 2026, such that 100% will be vested on June 30, 2026.