DOUGLAS A. ALEXANDER - 23 Sep 2025 Form 4 Insider Report for AMKOR TECHNOLOGY, INC. (AMKR)

Role
Director
Signature
/s/ Mark N. Rogers, Attorney-in-Fact for Douglas A. Alexander
Issuer symbol
AMKR
Transactions as of
23 Sep 2025
Net transactions value
$0
Form type
4
Filing time
25 Sep 2025, 16:44:36 UTC
Previous filing
27 Jun 2025
Next filing
29 Dec 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
ALEXANDER DOUGLAS A Director 2045 EAST INNOVATION CIRCLE, TEMPE /s/ Mark N. Rogers, Attorney-in-Fact for Douglas A. Alexander 25 Sep 2025 0001195858

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 +24 +0.27% $0.000000 9,204 23 Sep 2025 Common Stock 24 Direct F1
transaction AMKR Restricted Stock Units Award $0 +24 +0.27% $0.000000 8,863 23 Sep 2025 Common Stock 24 Direct F2
transaction AMKR Restricted Stock Units Award $0 +27 +0.28% $0.000000 9,855 23 Sep 2025 Common Stock 27 Direct F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Represents dividend equivalent units ("DEUs") accrued upon the payment of a dividend on September 23, 2025 with respect to time-vested restricted stock units ("RSUs") of Amkor Technology, Inc. (the "Issuer") granted to the Reporting Person on May 17, 2022. Each DEU represents an additional RSU subject to the same provisions as the RSU with respect to which the DEU was accrued.
F2 Represents DEUs accrued upon the payment of a dividend on September 23, 2025 with respect to RSUs of the Issuer granted to the Reporting Person on May 16, 2023. Each DEU represents an additional RSU subject to the same provisions as the RSU with respect to which the DEU was accrued.
F3 Represents DEUs accrued upon the payment of a dividend on September 23, 2025 with respect to RSUs of the Issuer granted to the Reporting Person on May 15, 2025. Each DEU represents an additional RSU subject to the same provisions as the RSU with respect to which the DEU was accrued.