Mark N. Rogers - 16 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
16 Feb 2026
Net transactions value
-$235,394
Form type
4
Filing time
18 Feb 2026, 16:09:02 UTC
Previous filing
20 Jan 2026
Next filing
20 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 18 Feb 2026 0001201997

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction AMKR Common Stock Options Exercise $0 +1,856 +7.8% $0.000000 25,718 16 Feb 2026 Direct
transaction AMKR Common Stock Tax liability $37,794 -796 -3.1% $47.48 24,922 16 Feb 2026 Direct F1
transaction AMKR Common Stock Options Exercise $37,000 +5,000 +20% $7.40 29,922 17 Feb 2026 Direct
transaction AMKR Common Stock Sale $234,600 -5,000 -17% $46.92 24,922 17 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 Options Exercise $0 -1,856 -50% $0.000000 1,855 16 Feb 2026 Common Stock 1,856 $0.000000 Direct F3
transaction AMKR Employee Stock Option (Right-to-Buy) Options Exercise $0 -5,000 -4.8% $0.000000 100,000 17 Feb 2026 Common Stock 5,000 $7.40 Direct F4
* 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 transaction represents shares withheld by Amkor Technology, Inc. (the "Issuer") in connection with the vesting of certain restricted stock units ("RSUs") granted to the Reporting Person on February 16, 2023 (the "Grant Date") pursuant to the Issuer's 2021 Equity Incentive Plan, as amended, and the related award agreement. These shares were withheld to satisfy the Reporting Person's tax withholding obligations. The Issuer will pay these taxes on behalf of the Reporting Person.
F2 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.
F3 On the Grant Date, the Reporting Person was granted 7,423 RSUs which vest in four equal annual installments beginning on the first anniversary of the Grant Date.
F4 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.