Segment Information (Tables)

9 Months Ended

Sep. 30, 2025

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

	Three Months Ended September 30, 2025
	Marketing Services		Digital Transformation		Media & Commerce		Communications		The Marketing Cloud		Total
	(dollars in thousands)
Revenue (1)	$	297,195	$	103,710	$	174,738	$	144,947	$	27,187	$	747,777
Billable costs	51,101		8,334		20,581		48,455		5		128,476
Staff costs	144,354		62,123		91,365		56,650		18,763		373,255
Administrative costs	27,919		6,981		22,966		12,516		3,663		74,045
Unbillable and other costs *	17,227		387		15,196		2,245		5,883		40,938
Adjusted EBITDA	56,594		25,885		24,630		25,081		(1,127)		131,063
Adjusted EBITDA - Corporate and eliminations											(16,481)
Total Consolidated Adjusted EBITDA											114,582
Stock-based compensation											12,646
Depreciation and amortization											44,260
Deferred acquisition consideration											(13,348)
Impairment and other losses											466
Other items, net											9,645
Operating Income											60,913
Other income (expenses):
Interest expense, net											(25,196)
Foreign exchange, net											(366)
Other, net											(2,032)
											(27,594)
Income before income taxes and equity in earnings of non-consolidated affiliates											33,319
Income tax expense											9,555
Income before equity in earnings of non-consolidated affiliates											23,764
Equity in loss of non-consolidated affiliates											(1)
Net income											23,763
Net loss attributable to noncontrolling and redeemable noncontrolling interests											856
Net income attributable to Stagwell Inc. common shareholders											$	24,619

(1) Total consolidated revenue of $742,998 reflects an intercompany elimination of $4,779.

*For each reportable segment, Unbillable and other costs includes costs to fulfill customer contract requirements such as research and subscription related costs, audience measurement, data and analytics, panels and survey costs, and also includes travel related expenses.

	Nine Months Ended September 30, 2025
	Marketing Services		Digital Transformation		Media & Commerce		Communications		The Marketing Cloud		Total
	(dollars in thousands)
Revenue (1)	$	839,457	$	292,188	$	479,648	$	420,215	$	78,785	$	2,110,293
Billable costs	124,590		17,210		47,793		135,109		16		324,718
Staff costs	421,226		184,886		269,318		172,273		53,683		1,101,386
Administrative costs	86,433		19,599		67,097		37,042		13,531		223,702
Unbillable and other costs *	60,230		1,151		43,833		6,910		17,178		129,302
Adjusted EBITDA	146,978		69,342		51,607		68,881		(5,623)		331,185
Adjusted EBITDA - Corporate and eliminations											(43,166)
Total Consolidated Adjusted EBITDA											288,019
Stock-based compensation											44,143
Depreciation and amortization											127,635
Deferred acquisition consideration											(9,911)
Impairment and other losses											466
Other items, net											23,316
Operating Income											102,370
Other income (expenses):
Interest expense, net											(72,007)
Foreign exchange, net											(484)
Other, net											(2,143)
											(74,634)
Income before income taxes and equity in earnings of non-consolidated affiliates											27,736
Income tax expense											13,950
Income before equity in earnings of non-consolidated affiliates											13,786
Equity in income of non-consolidated affiliates											18
Net income											13,804
Net loss attributable to noncontrolling and redeemable noncontrolling interests											2,637
Net income attributable to Stagwell Inc. common shareholders											$	16,441

(1) Total consolidated revenue of $2,101,556 reflects an intercompany elimination of $8,737.

*For each reportable segment, Unbillable and other costs includes costs to fulfill customer contract requirements such as research and subscription related costs, audience measurement, data and analytics, panels and survey costs, and also includes travel related expenses.

	Three Months Ended September 30, 2024
	Marketing Services		Digital Transformation		Media & Commerce		Communications		The Marketing Cloud		Total
	(dollars in thousands)
Revenue (1)	$	267,675	$	88,292	$	159,595	$	184,665	$	11,443	$	711,670
Billable costs	42,264		3,022		14,037		72,102		—		131,425
Staff costs	139,694		56,384		88,390		55,518		8,887		348,873
Administrative costs	26,825		5,036		20,171		11,668		3,505		67,205
Unbillable and other costs *	15,435		368		16,357		2,848		2,481		37,489
Adjusted EBITDA	43,457		23,482		20,640		42,529		(3,430)		126,678
Adjusted EBITDA - Corporate and eliminations											(15,509)
Total Consolidated Adjusted EBITDA											111,169
Stock-based compensation											16,935
Depreciation and amortization											36,044
Deferred acquisition consideration											560
Other items, net											15,851
Operating Income											41,779
Other income (expenses):
Interest expense, net											(23,781)
Foreign exchange, net											1,312
Other, net											249
											(22,220)
Income before income taxes and equity in earnings of non-consolidated affiliates											19,559
Income tax expense											5,691
Income before equity in earnings of non-consolidated affiliates											13,868
Equity in loss of non-consolidated affiliates											(4)
Net income											13,864
Net income attributable to noncontrolling and redeemable noncontrolling interests											(10,593)
Net income attributable to Stagwell Inc. common shareholders											$	3,271

(1) Total consolidated revenue of $711,281 reflects an intercompany elimination of $389.

*For each reportable segment, Unbillable and other costs includes costs to fulfill customer contract requirements such as research and subscription related costs, audience measurement, data and analytics, panels and survey costs, and also includes travel related expenses.

	Nine Months Ended September 30, 2024
	Marketing Services		Digital Transformation		Media & Commerce		Communications		The Marketing Cloud		Total
	(dollars in thousands)
Revenue (1)	$	782,371	$	248,976	$	521,963	$	473,957	$	25,823	$	2,053,090
Billable costs	124,196		9,363		82,180		170,067		—		385,806
Staff costs	407,948		166,965		265,576		162,715		21,024		1,024,228
Administrative costs	74,293		15,707		61,509		33,689		9,659		194,857
Unbillable and other costs *	53,176		788		46,244		7,958		5,547		113,713
Adjusted EBITDA	122,758		56,153		66,454		99,528		(10,407)		334,486
Adjusted EBITDA - Corporate and eliminations											(46,898)
Total Consolidated Adjusted EBITDA											287,588
Stock-based compensation											38,926
Depreciation and amortization											112,881
Deferred acquisition consideration											7,950
Impairment and other losses											1,715
Other items, net											36,576
Operating Income											89,540
Other income (expenses):
Interest expense, net											(68,279)
Foreign exchange, net											(2,301)
Other, net											(825)
											(71,405)
Income before income taxes and equity in earnings of non-consolidated affiliates											18,135
Income tax expense											9,441
Income before equity in earnings of non-consolidated affiliates											8,694
Equity in income of non-consolidated affiliates											503
Net income											9,197
Net loss attributable to noncontrolling and redeemable noncontrolling interests											(10,173)
Net loss attributable to Stagwell Inc. common shareholders											$	(976)

(1) Total consolidated revenue of $2,052,508 reflects an intercompany elimination of $582.

*For each reportable segment, Unbillable and other costs includes costs to fulfill customer contract requirements such as research and subscription related costs, audience measurement, data and analytics, panels and survey costs, and also includes travel related expenses.