Stockholders' Equity and Noncontrolling Interests (Tables)

3 Months Ended

Mar. 31, 2026

Stockholders' Equity and Noncontrolling Interests

Rollforward of consolidated changes in equity

A rollforward of consolidated changes in equity and redeemable noncontrolling interests for the three months ended March 31, 2026 is as follows:

	Stockholders’ equity attributable to Amphenol Corporation
											Accumulated						Redeemable
	Common Stock			Treasury Stock			Additional				Other		Non-				Non-
	Shares			Shares			Paid-In		Retained		Comprehensive		controlling		Total		controlling
	(in millions)	Amount		(in millions)	Amount		Capital		Earnings		Loss		Interests		Equity		Interests
Balance as of December 31, 2025	1,228.9	$	1.2	(2.4)	$	(195.8)	$	4,232.9	$	9,854.3	$	(479.5)	$	87.3	$	13,500.4	$	9.3
Net income										933.0				10.3		943.3		—
Other comprehensive income (loss)												(14.4)		1.1		(13.3)		(0.2)
Acquisitions resulting in noncontrolling interests														6.9		6.9
Purchase of treasury stock				(1.3)		(178.0)										(178.0)
Retirement of treasury stock	—		—	—		—				—						—
Stock options exercised	3.3		—	0.8		63.8		80.3		(47.8)						96.3
Dividends declared ($0.25 per common share)										(307.4)						(307.4)
Stock-based compensation expense								34.2								34.2
Balance as of March 31, 2026	1,232.2	$	1.2	(2.9)	$	(310.0)	$	4,347.4	$	10,432.1	$	(493.9)	$	105.6	$	14,082.4	$	9.1

A rollforward of consolidated changes in equity and redeemable noncontrolling interests for the three months ended March 31, 2025 is as follows:

	Stockholders’ equity attributable to Amphenol Corporation
											Accumulated						Redeemable
	Common Stock			Treasury Stock			Additional				Other		Non-				Non-
	Shares			Shares			Paid-In		Retained		Comprehensive		controlling		Total		controlling
	(in millions)	Amount		(in millions)	Amount		Capital		Earnings		Loss		Interests		Equity		Interests
Balance as of December 31, 2024	1,212.9	$	1.2	(3.6)	$	(199.7)	$	3,601.8	$	7,105.0	$	(716.3)	$	55.4	$	9,847.4	$	8.7
Net income										737.8				6.1		743.9		0.3
Other comprehensive income (loss)												72.2		0.4		72.6		0.3
Purchase of treasury stock				(2.7)		(180.9)										(180.9)
Retirement of treasury stock	(2.7)		—	2.7		180.9				(180.9)						—
Stock options exercised	2.2		—	0.5		25.7		43.8		(16.4)						53.1
Dividends declared ($0.165 per common share)										(199.6)						(199.6)
Stock-based compensation expense								26.6								26.6
Balance as of March 31, 2025	1,212.4	$	1.2	(3.1)	$	(174.0)	$	3,672.2	$	7,445.9	$	(644.1)	$	61.9	$	10,363.1	$	9.3

Schedules of dividends

	Three Months Ended
	March 31,
	2026		2025
Dividends declared	$	307.4	$	199.6
Dividends paid (including those declared in the prior year)		306.7		199.5