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SEGMENT AND CUSTOMER REPORTING
 3 Months Ended
Mar. 31, 2026
Segment Reporting [Abstract]  
SEGMENT AND CUSTOMER REPORTING SEGMENT AND CUSTOMER REPORTING
 
Segments:

Celestica serves customers in two operating and reportable segments. Our CCS segment consists of our Communications and Enterprise (servers and storage) end markets. Our ATS segment consists of our ATS end market, and is comprised of our Aerospace and Defense, Industrial, HealthTech, and Capital Equipment businesses. Segment performance is evaluated based on segment revenue, segment income and segment margin (segment income as a percentage of segment revenue). Segment income is defined as a segment's revenue less its cost of sales and its allocatable portion of selling, general and administrative expenses (SG&A) and research and development expenses (collectively, Segment Costs). See note 21 to our 2025 AFS for a description of the businesses that comprise our segments, how segment revenue is attributed, how costs are allocated to our segments, and how segment income and segment margin are determined.
Information regarding each reportable segment for the periods indicated is set forth below:
Revenue by segment:Three months ended March 31
20262025
% of total% of total
ATS$806.0 20 %$807.2 30 %
CCS
Communications$2,410.6 60 %$1,427.7 54 %
Enterprise830.4 20 %413.7 16 %
$3,241.0 80 %$1,841.4 70 %
Total revenue$4,047.0 $2,648.6 

Segment Costs by segment:Three months ended March 31
20262025
ATS cost of sales$710.3 $726.5 
ATS other Segment Costs47.7 40.0 
CCS cost of sales2,878.4 1,630.6 
CCS other Segment Costs85.4 63.7 
Total Segment Costs$3,721.8 $2,460.8 

Segment income, segment margin, and reconciliation of segment income to earnings before income taxes:Three months ended March 31
Note20262025
Segment MarginSegment Margin
ATS segment income and margin$48.0 6.0%$40.7 5.0%
CCS segment income and margin277.2 8.6%147.1 8.0%
Total segment income325.2 187.8 
Reconciling items:
Finance costs16.0 13.7 
Miscellaneous expense (income)
11(0.2)1.4 
Employee SBC expense30.5 26.0 
TRS fair value adjustment (TRS FVA): losses
17.0 19.1 
Amortization of intangible assets (excluding computer software)10.0 10.0 
Restructuring and other charges (recoveries)
10(4.4)3.9 
Earnings before income taxes$256.3 $113.7 

Customers:

Three customers (all in our CCS segment) individually represented 10% or more of total revenue in Q1 2026 (35%, 15% and 15%). Three customers (all in our CCS segment) individually represented 10% or more of total revenue in Q1 2025 (28%, 13% and 10%).