Amkor Technology (AMKR) director sells 15,000 shares in open-market trade

Rhea-AI Filing Summary

Amkor Technology director Gil C. Tily sold 15,000 shares of Common Stock in an open-market transaction. The shares were sold at a price of $77.30 per share. After this sale, Tily directly holds 108,806 Amkor shares.

Insights

Equity ownership analyst

Director executes a moderate open-market sale while retaining a substantial stake.

Director Gil C. Tily sold 15,000 shares of Amkor Technology Common Stock in an open-market trade at $77.30 per share. The transaction is coded as a non-derivative sale, with no options or other derivatives exercised in this filing.

Following the sale, Tily directly holds 108,806 shares, indicating that only a portion of the position was sold. The filing shows one net-sell transaction totaling 15,000 shares, suggesting a routine portfolio adjustment rather than a full exit, based solely on this disclosure.

Insider Trade Summary

Net Seller: 15,000 shares ($1,159,500)

Net Sell 1 txn

Insider Tily Gil C.

Role null

Sold 15,000 shs ($1.16M)

Type	Security	Shares	Price	Value
Sale	Common Stock	15,000	$77.30	$1.16M

Holdings After Transaction: Common Stock — 108,806 shares (Direct, null)

Footnotes (1)

Key Figures

Shares sold: 15,000 shares Sale price per share: $77.30 per share Shares held after transaction: 108,806 shares +1 more

4 metrics

Shares sold 15,000 shares Open-market sale of Common Stock

Sale price per share $77.30 per share Price for the 15,000-share sale

Shares held after transaction 108,806 shares Direct ownership following the sale

Net shares sold 15,000 shares Net-sell direction in transaction summary

Key Terms

open-market sale, non-derivative, Common Stock

3 terms

open-market sale financial

"transaction_action": "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

non-derivative financial

"transaction_type": "non-derivative""

Common Stock financial

"security_title": "Common Stock""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a 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). See Instruction 10.

1. Name and Address of Reporting Person^*

Tily Gil C.

(Last) (First) (Middle)

2045 EAST INNOVATION CIRCLE

(Street)

TEMPE ARIZONA 85284

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
AMKOR TECHNOLOGY, INC. [ AMKR ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/11/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	05/11/2026		S		15,000	D	$77.3	108,806	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

	/s/ Mark N. Rogers, Attorney-in-Fact for Gil C. Tily	05/13/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did Amkor Technology (AMKR) director Gil C. Tily report?

Gil C. Tily reported selling 15,000 shares of Amkor Technology Common Stock. The transaction was an open-market sale coded as a non-derivative transaction, indicating direct trading in the stock rather than exercising options or other derivative securities.

At what price did Gil C. Tily sell Amkor Technology (AMKR) shares?

Gil C. Tily sold 15,000 Amkor Technology Common Stock shares at $77.30 per share. This price reflects the per-share consideration for the reported open-market sale executed on the transaction date shown in the filing data.

How many Amkor Technology (AMKR) shares does Gil C. Tily hold after the sale?

After the transaction, Gil C. Tily directly holds 108,806 shares of Amkor Technology Common Stock. This remaining stake shows that the 15,000-share sale represents only part of his reported holdings according to the Form 4 filing data.

Was the Amkor Technology (AMKR) insider trade a buy or sell transaction?

The transaction was a sell. The Form 4 classifies it as an open-market sale of 15,000 shares of Amkor Technology Common Stock, with the transaction direction explicitly identified as a sale in the filing’s structured data.

Did the Amkor Technology (AMKR) Form 4 include any option exercises or derivatives?

No derivative activity is reported in this Form 4. The transaction is labeled non-derivative, and the derivative summary is empty, indicating no option exercises, conversions, or other derivative trades were disclosed in this particular filing.