MARK N. ROGERS - 16 Dec 2025 Form 4 Insider Report for AMKOR TECHNOLOGY, INC. (AMKR)

Role
EVP & General Counsel
Signature
/s/ Mark N. Rogers
Issuer symbol
AMKR
Transactions as of
16 Dec 2025
Transactions value $
-$711,000
Form type
4
Filing time
17 Dec 2025, 16:06:39 UTC
Previous filing
19 Nov 2025
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 17 Dec 2025 0001201997

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction AMKR Common Stock Options Exercise $148K +20K +83.82% $7.40 43.9K 16 Dec 2025 Direct
transaction AMKR Common Stock Sale -$859K -20K -45.6% $42.95 23.9K 16 Dec 2025 Direct F1, 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 Employee Stock Option (Right-to-Buy) Options Exercise $0 -20K -15.38% $0.00 110K 16 Dec 2025 Common Stock 20K $7.40 Direct F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Buy Plan / Sale Plan: These are also open market purchases/sales of shares, but in this case the transaction is part of a trading plan. Rule 10b5-1 allows insiders to setup a trading plan to buy/sell stocks over a certain period of time. Since the purchases/sales are predetermined, this protects the insiders from violating insider trading law.

Transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

Explanation of Responses:

Id Content
F1 The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 1, 2025.
F2 The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $42.15 to $43.65. The Reporting Person hereby undertakes to provide, upon request, to the staff of the Securities and Exchange Commission, Amkor Technology, Inc. (the "Issuer"), or any security holder of the Issuer, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (2) to this Form 4.
F3 This stock option (the "Option") to acquire 200,000 shares of the Issuer's common stock (the "Option Shares") was granted on June 10, 2019 (the "Option Grant Date") and vested over four years as follows: (i) with respect to 25% of the Option Shares, on the first anniversary of the Option Grant Date; and (ii) with respect to the remainder of the Option Shares, in equal quarterly installments thereafter, such that 100% of the Option vested on the fourth anniversary of the Option Grant Date.