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Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2025

Earnings Per Share [Abstract]

Schedule of Computation of Basic and Diluted Earnings Per Share

The following table summarizes the computation of basic and diluted EPS:

			For the Three Months Ended September 30,												For the Nine Months Ended September 30,
			2025						2024						2025						2024
			(In thousands, except per share data)
Net income attributable to Amkor common stockholders			$	126,589					$	122,569					$	202,134					$	248,363
Weighted-average number of common shares outstanding - basic			247,158						246,480						247,035						246,239
Effect of dilutive securities:
Share-based awards			1,144						1,442						1,019						1,559
Weighted-average number of common shares outstanding - diluted			248,302						247,922						248,054						247,798
Net income attributable to Amkor per common share:
Basic			$	0.51					$	0.50					$	0.82					$	1.01
Diluted			0.51						0.49						0.81						1.00

Schedule of Antidilutive Effect of Potential Shares of Common Stock that were Excluded from Diluted Earnings Per Share

The following table summarizes the potential shares of common stock that were excluded from diluted EPS because the effect of including these potential shares was anti-dilutive:

			For the Three Months Ended September 30,												For the Nine Months Ended September 30,
			2025						2024						2025						2024
			(In thousands)
Share-based awards			18						—						3						—

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- References

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- Definition

Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482662/260-10-50-1

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- Definition

Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482662/260-10-50-1

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