Stockholders' Equity and Noncontrolling Interests (Tables)

9 Months Ended

Sep. 30, 2025

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 September 30, 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 (1)		Equity		Interests
Balance as of June 30, 2025	1,222.0	$	1.2	(1.9)	$	(104.9)	$	3,957.7	$	8,135.2	$	(469.9)	$	70.3	$	11,589.6	$	10.1
Net income										1,245.7				9.3		1,255.0		0.1
Other comprehensive income (loss)												(37.8)		0.4		(37.4)		—
Distributions to shareholders of noncontrolling interests														(3.6)		(3.6)
Purchase of treasury stock				(1.4)		(152.9)										(152.9)
Retirement of treasury stock	—		—	—		—				—						—
Stock options exercised	4.4		—	0.6		36.9		98.1		(24.0)						111.0
Dividends declared ($0.165 per common share)										(201.9)						(201.9)
Stock-based compensation expense								36.9								36.9
Balance as of September 30, 2025	1,226.4	$	1.2	(2.7)	$	(220.9)	$	4,092.7	$	9,155.0	$	(507.7)	$	76.4	$	12,596.7	$	10.2

(1) Excludes redeemable noncontrolling interests.

A rollforward of consolidated changes in equity and redeemable noncontrolling interests for the nine months ended September 30, 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 (1)		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										3,074.8				24.9		3,099.7		0.4
Other comprehensive income (loss)												208.6		1.6		210.2		1.1
Distributions to shareholders of noncontrolling interests														(5.5)		(5.5)
Purchase of treasury stock				(6.1)		(493.9)										(493.9)
Retirement of treasury stock	(4.7)		—	4.7		341.0				(341.0)						—
Stock options exercised	18.2		—	2.3		131.7		396.1		(81.1)						446.7
Dividends declared ($0.495 per common share)										(602.7)						(602.7)
Stock-based compensation expense								94.8								94.8
Balance as of September 30, 2025	1,226.4	$	1.2	(2.7)	$	(220.9)	$	4,092.7	$	9,155.0	$	(507.7)	$	76.4	$	12,596.7	$	10.2

(1)Excludes redeemable noncontrolling interests.

A rollforward of consolidated changes in equity and redeemable noncontrolling interests for the three months ended September 30, 2024 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 (1)		Equity		Interests
Balance as of June 30, 2024	1,205.6	$	1.2	(1.8)	$	(73.8)	$	3,349.2	$	6,352.0	$	(648.5)	$	50.5	$	9,030.6	$	19.9
Net income										604.4				4.1		608.5		0.4
Other comprehensive income (loss)												128.6		1.7		130.3		0.4
Capital contributions from noncontrolling interests														0.4		0.4
Purchase of noncontrolling interest								(0.2)						(0.1)		(0.3)		—
Distributions to shareholders of noncontrolling interests														(3.0)		(3.0)
Purchase of treasury stock				(2.7)		(176.2)										(176.2)
Retirement of treasury stock	—		—	—		—				—						—
Stock options exercised	3.9		—	0.3		13.1		79.1		(7.0)						85.2
Dividends declared ($0.165 per common share)										(198.9)						(198.9)
Stock-based compensation expense								29.5								29.5
Balance as of September 30, 2024	1,209.5	$	1.2	(4.2)	$	(236.9)	$	3,457.6	$	6,750.5	$	(519.9)	$	53.6	$	9,506.1	$	20.7

(1) Excludes redeemable noncontrolling interests.

A rollforward of consolidated changes in equity and redeemable noncontrolling interests for the nine months ended September 30, 2024 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 (1)		Equity		Interests
Balance as of December 31, 2023	1,201.3	$	1.2	(3.5)	$	(142.8)	$	3,100.6	$	5,921.1	$	(533.6)	$	49.3	$	8,395.8	$	30.7
Net income										1,677.8				10.7		1,688.5		1.1
Other comprehensive income (loss)												13.7		0.6		14.3		0.1
Capital contributions from noncontrolling interests														1.5		1.5
Purchase of noncontrolling interest								(1.1)						(0.1)		(1.2)		(11.2)
Distributions to shareholders of noncontrolling interests														(8.4)		(8.4)
Purchase of treasury stock				(8.6)		(520.4)										(520.4)
Retirement of treasury stock	(5.9)		—	5.9		344.2				(344.2)						—
Stock options exercised	14.1		—	2.0		82.1		278.2		(40.8)						319.5
Dividends declared ($0.385 per common share)										(463.4)						(463.4)
Stock-based compensation expense								79.9								79.9
Balance as of September 30, 2024	1,209.5	$	1.2	(4.2)	$	(236.9)	$	3,457.6	$	6,750.5	$	(519.9)	$	53.6	$	9,506.1	$	20.7

(1) Excludes redeemable noncontrolling interests.

Schedules of dividends

	Three Months Ended September 30,				Nine Months Ended September 30,
	2025		2024		2025		2024
Dividends declared	$	201.9	$	198.9	$	602.7	$	463.4
Dividends paid (including those declared in the prior year)		201.2		132.4		600.3		396.2