Celestica (CLS) delivered one of the clearest AI infrastructure earnings prints of the quarter, using first-quarter results to raise its full-year 2026 outlook and reinforce the idea that hyperscaler demand is now reshaping both the company’s revenue mix and margin profile.
For Q1 2026, Celestica reported revenue of $4.05 billion, up 53% from $2.65 billion a year earlier. GAAP operating margin improved to 6.7% from 4.9%, while adjusted operating margin, a non-GAAP measure, rose to 8.0% from 7.1%. GAAP EPS increased to $1.83 from $0.74, and adjusted EPS climbed to $2.16 from $1.20. The company also repurchased 0.1 million shares for $20 million during the quarter (Celestica Q1 2026 earnings release).
The headline numbers were strong, but the more important takeaway was where the growth came from. Celestica said its Connectivity & Cloud Solutions segment generated $3.24 billion in revenue, up 76% year over year, while Hardware Platform Solutions revenue rose about 63% to roughly $1.7 billion. That is the clearest sign in the release that AI-related server, networking, and cloud infrastructure demand is driving not just growth, but higher operating leverage as well.
Q1 performance was strong across revenue, margins, and earnings
Celestica’s first quarter showed broad-based improvement rather than a one-line beat.
| Metric | Q1 2026 | Q1 2025 | Notes |
|---|---|---|---|
| Revenue | $4.05 billion | $2.65 billion | Up 53% |
| GAAP operating margin | 6.7% | 4.9% | Expanded year over year |
| Adjusted operating margin (non-GAAP) | 8.0% | 7.1% | New company milestone |
| GAAP EPS | $1.83 | $0.74 | Up sharply year over year |
| Adjusted EPS (non-GAAP) | $2.16 | $1.20 | Above prior guidance range |
CEO Rob Mionis said Celestica delivered a strong first quarter, highlighted by $4.05 billion in revenue, $2.16 in adjusted EPS, and an 8.0% adjusted operating margin that marked a new milestone for the company. He added that the company continues to see accelerating growth from its CCS customer base and increasing profitability in both CCS and ATS, which helped support a higher 2026 outlook (Celestica Q1 2026 earnings release).
That mix matters. A company can post fast growth without proving that the quality of the business is improving. Celestica’s quarter was different, because margin expansion moved alongside revenue acceleration.
AI infrastructure demand is changing the business mix
The biggest story sat inside the segment breakdown.
Celestica’s CCS segment, which includes communications and enterprise infrastructure businesses, posted $3.24 billion in revenue, up 76% from the prior year, and its segment margin improved to 8.6% from 8.0%. Within that, Hardware Platform Solutions revenue rose about 63% year over year to roughly $1.7 billion. By contrast, the ATS segment was much steadier, with revenue of $0.81 billion that was relatively flat year over year, though ATS margin still improved to 6.0% from 5.0% (Celestica Q1 2026 earnings release).
That tells investors two things. First, hyperscaler and data-center demand is not just inflating the top line, it is also becoming a larger share of the company. Second, the legacy businesses are not collapsing under that shift, which makes the overall growth story more durable.
It is also why Celestica now looks less like a conventional electronics manufacturing name and more like a leveraged supplier to the AI infrastructure buildout. That can be powerful for earnings momentum, but it can also make the company more sensitive to customer concentration, program timing, and working-capital needs as larger cloud projects ramp.
The guidance raise is the real valuation driver
Celestica raised its full-year 2026 revenue outlook to $19.0 billion from $17.0 billion. It also increased its adjusted EPS outlook to $10.15 from $8.75 and lifted its adjusted operating margin outlook to 8.1% from 7.8%. At the same time, the company left its free cash flow outlook unchanged at $500 million (Celestica Q1 2026 earnings release).
For the second quarter, Celestica guided for revenue of $4.15 billion to $4.45 billion and adjusted EPS of $2.14 to $2.34.
The combination is revealing. Revenue and earnings expectations are moving sharply higher, but free cash flow is not. That suggests investors should read this as a scale-and-execution story, not just an effortless margin expansion story. Fast AI-driven growth can require larger inventory positions, heavier customer support, and more financing flexibility.
Celestica underscored that point by upsizing its revolving credit facility from $750 million to $1.75 billion, taking the total amended credit facility to about $2.5 billion. That is not necessarily a red flag, but it is a reminder that a much bigger business often needs a much bigger capital base.
What investors should watch next
Celestica had a market capitalization of approximately $47.79 billion as of April 28, 2026, according to Yahoo Finance. At that size, the company is no longer a hidden AI beneficiary. Investors are already rewarding the story, which means execution now matters more than narrative.
The next test is whether Celestica can convert today’s demand surge into a multi-quarter earnings profile rather than a short spike tied to a few heavy programs. Management said its 2027 outlook is also strengthening because of new program wins and better customer visibility, which is encouraging. But investors should still watch whether CCS keeps expanding without introducing too much volatility in margins, balance-sheet intensity, or customer exposure.
The broad thesis is intact: AI infrastructure demand is making Celestica larger, more profitable, and strategically more important. The harder question is whether those gains can stay disciplined as the company scales.
Key Signals for Investors
- CCS growth and improving segment margins show that AI infrastructure demand is lifting both revenue scale and earnings quality, not just shipment volume.
- The unchanged $500 million free cash flow outlook is a reminder that rapid expansion can still absorb cash, even when revenue and EPS guidance move higher.
- The most important forward indicator is whether Q2 and 2027 program ramps preserve margin discipline as Celestica grows deeper into large hyperscaler-related workloads.
Sources
- Celestica Q1 2026 earnings release: https://www.globenewswire.com/news-release/2026/04/27/3282031/0/en/celestica-announces-first-quarter-2026-financial-results.html
- Celestica corporate release mirror: https://corporate.celestica.com/static-files/7e777cad-64eb-4ae4-90c7-c715a29d100d
- Yahoo Finance CLS quote page: https://finance.yahoo.com/quote/CLS/.