Celestica (CLS) Q1 2026 earnings review
AI Gold Rush Supercharges Growth, Guidance Raised Massively
Celestica delivered an explosive Q1 2026, driven entirely by hyperscaler investments in AI data center infrastructure. Revenue surged 53% YoY to $4.05 billion, crushing guidance, while Adjusted EPS jumped 80% to $2.16. The Connectivity & Cloud Solutions (CCS) segment is effectively carrying the entire company, accelerating to 76% YoY growth. The momentum is so strong that management hiked its FY26 revenue guidance by a staggering $2.0 billion to $19.0 billion. However, this hyper-growth requires massive capital: despite the $2B revenue bump, FY26 free cash flow guidance remains flat at $500 million, and share buybacks slowed to a crawl in Q1.
🐂 Bull Case
The CCS segment is accelerating rapidly (+76% YoY), driven by new AI/ML compute and 800G/1.6T networking programs. The FY26 guidance raise of $2B indicates zero signs of a macro slowdown in data center capex.
Adjusted operating margin hit a record 8.0% (up from 7.1% a year ago). Favorable product mix and operating leverage are translating volume growth directly to the bottom line.
🐻 Bear Case
Explosive growth is expensive. The company upsized its credit facility by $1B+ and held its FY26 FCF guide flat at $500M despite $2B in extra revenue, signaling immense cash requirements to fund capacity and inventory.
The Advanced Technology Solutions (ATS) segment is Stable to stagnant. Revenue was completely flat YoY at $810M, turning Celestica into a heavily concentrated play on a few hyperscaler budgets.
⚖️ Verdict: 🟢
Bullish. The scale of the FY26 guidance raise ($2 billion additional revenue, $1.40 additional EPS) proves that Celestica is successfully capturing the generational AI infrastructure wave. Capital intensity concerns are valid, but the sheer volume of profitable growth overrides them.
Key Themes
CCS Segment: The Undisputed Growth Engine
Connectivity & Cloud Solutions (CCS) revenue is Accelerating, posting 76% YoY growth to $3.24 billion. This segment now accounts for 80% of total company revenue. The growth is fueled by aggressive hyperscaler deployment of AI networks and AI/ML compute hardware. Operating margin in CCS also expanded to 8.6%, proving that this growth is highly profitable.
Hardware Platform Solutions (HPS) Scaling Up
HPS continues to be a crucial driver of margin expansion and customer stickiness. HPS revenue reached $1.7 billion in Q1, an Accelerating growth rate of 63% YoY (compared to $1.0B in Q1 2025). This shift toward design-led, high-complexity manufacturing acts as a deep competitive moat.
ATS Segment Lags the Boom
While CCS explodes, Advanced Technology Solutions (ATS) is effectively Stable/Stagnant. Q1 revenue was $0.81 billion, entirely flat compared to a year ago. While management has successfully engineered a Reversing trend in profitability here (ATS segment margin improved from 5.0% to 6.0%), the lack of top-line growth remains a structural drag on the broader corporate portfolio.
Co-Packaged Optics (CPO) Innovation Validated
Celestica announced a major design and manufacturing award for a Co-packaged Optics (CPO) Ethernet switch with a hyperscaler. The switch uses 1.6 Terabit silicon, liquid cooling, and co-packaged optical interconnects—cutting-edge tech optimized for AI scale-out networks. This proves Celestica's R&D investments are successfully capturing next-generation architecture beyond traditional 800G.
Heavy Capital Demands Restrict Shareholder Returns
The massive scale-up is draining cash. The company upsized its credit facility to $2.5B (doubling the revolver to $1.75B). Concurrently, share buybacks plummeted to just $20 million in Q1 2026 (down from $75 million in Q1 2025). Furthermore, despite adding $2 billion to the FY26 revenue outlook, FY26 Free Cash Flow guidance remained completely unchanged at $500 million. This contradiction suggests working capital and CapEx requirements are consuming all the incremental cash generated by the new business.
Structural Margin Expansion
Adjusted operating margin hit a new corporate milestone of 8.0%, Accelerating from 7.1% in the prior year. This was achieved through massive operating leverage in the CCS segment and strategic shedding of low-margin programs within ATS. Management raised the full-year margin target to 8.1%, signaling confidence in sustained pricing power and cost absorption.
Other KPIs
Accelerating from $93.6 million in Q1 2025. Operating cash flow of $356.3 million easily covered $218.4 million in net property, plant, and equipment purchases. However, the rapidly growing accounts receivable and inventory balances ($5.84 billion combined) will require careful management.
Accelerating massively from 31.5% in Q1 2025. This exceptional metric proves that despite heavy CapEx requirements, the earnings generated on new hyperscaler contracts are producing world-class returns on the capital deployed.
The company extended its maturity profile to 2031 and increased its revolving credit line by $1 billion (to $1.75B). This aggressive bolstering of liquidity is a direct response to the working capital needs created by a $19 billion run-rate business.
Guidance
Accelerating violently. Management raised the annual outlook from $17.0B to $19.0B, representing implied YoY growth of over 53% compared to FY25 ($12.39B). Furthermore, they explicitly noted that 2027 revenue is expected to grow 'significantly more' than the $6.5B absolute dollar growth expected in 2026.
Accelerating. Raised from previous guidance of $8.75. This represents roughly 67% YoY growth compared to the $6.05 achieved in FY25, highlighting the immense operating leverage inside the business model right now.
Stable. Unchanged from prior outlook despite the massive $2B revenue raise. This implies that working capital build and CapEx for facility expansions (Texas, Thailand) will absorb the entirety of the marginal cash flow generated from the $2B revenue bump.
Accelerating. The $4.3B midpoint represents roughly 50% YoY growth compared to Q2 2025 ($2.89B) and sequential growth over Q1 2026, confirming the ramp profile remains steep through the middle of the year.
Key Questions
The Missing Free Cash Flow
You raised FY26 revenue guidance by $2 billion, yet kept FCF guidance flat at $500 million. Can you break down exactly how much of that incremental gross profit is being consumed by working capital versus hard CapEx for the new capacity?
ATS Long-Term Viability
With the ATS segment sitting completely flat at $810 million while CCS surges past $3.2 billion, how do you view the strategic fit of ATS within the broader portfolio today? Are we approaching a point where a spin-off or sale makes more sense?
Co-Packaged Optics Economics
Regarding the new CPO liquid-cooled switch win ramping in 2027, how do the margin profile and capital intensity of manufacturing co-packaged optics compare to the traditional 800G hardware you are building today?
Buyback Philosophy Shift
Share repurchases dropped to just $20 million in Q1. Given the massive bump in the liquidity facility and expected earnings, is this a temporary pause to fund the capacity build, or should we expect minimal buybacks through 2026?