Celestica (CLS) just erased nearly $10 billion in market value in a single day, sending shares down about 16% after earnings. On the surface, this reaction seems confusing as the company beat first-quarter expectations, raised its full-year outlook, and delivered guidance that came in ahead of Wall Street estimates for the second quarter.
The stock climbed about 50% in the past month and is up roughly 380% over the past year, which left little room for anything short of spectacular results. RBC noted that while Celestica did beat expectations, the magnitude of the beat was smaller than its recent trend, even as guidance moved higher.
Behind the stock’s sharp decline, Celestica’s underlying business delivered a solid quarter, with improving fundamentals and stronger long-term positioning in AI and cloud infrastructure.
Raised 2026 guidance points to better results coming in H2
After first-quarter results, Celestica raised full-year 2026 revenue guidance to $19.0 billion from $17.0 billion, while guiding to adjusted EPS of $10.15 and free cash flow of $500 million. Based on analyst calculations, the updated outlook implies roughly a 28% half-over-half revenue ramp in the second half of 2026.
To hit that target, Celestica must show that hyperscaler AI and cloud demand is translating into real deployments, available components, and sufficient manufacturing capacity.
Q2 guidance narrowly beat consensus, with EPS of $2.14 to $2.34 versus $2.13 expected and revenue of $4.15 billion to $4.45 billion versus a $4.18 billion estimate, with a midpoint of $4.30 billion.
Management has tied the stronger full-year outlook to hyperscaler demand, better revenue mix in cloud and networking programs, and operating leverage. The next checkpoint for investors will be to see whether Q2 and Q3 provide enough bookings, visibility, and margin support to drive the ramp-up in the second half of the year that management is expecting.
Q1 margin expansion signals better earnings quality
Celestica’s first quarter showed both strong growth and improving profitability. Revenue rose 53% year over year to $4.05 billion, while adjusted operating margin expanded to 8.0% from 7.1%.
The improvement was driven by stronger performance in its Connectivity & Cloud Solutions and Hardware Platform Solutions segments, where cloud and networking programs carry higher margins. As these programs make up a larger share of revenue, overall profitability improves.
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If Celestica can sustain an 8.0% adjusted operating margin while growing revenue, the story shifts from cyclical EMS exposure to structurally better earnings quality.
EMS exposure (Electronics Manufacturing Services) refers to the company’s legacy manufacturing business, which typically fluctuates with customer demand and industry cycles.
CPO switch win extends AI runway
Celestica also disclosed a co-packaged optics Ethernet switch win with a hyperscaler customer, with production expected in 2027 using 1.6T switch silicon. A 1.6T switch can move 1.6 trillion bits of data per second, and is designed for massive AI workloads where large volumes of data need to move quickly between servers.
This type of switch integrates optical connections directly with the chip, allowing data to move faster and more efficiently within large AI data centers.
Richard Drury via Getty Images
The win pushes Celestica deeper into the AI networking stack, beyond current server and cloud builds. Co-packaged optics matters because power, density, and performance constraints are becoming more severe as AI clusters scale. A design win here signals that Celestica is being trusted with more complex system integration.
This moves the company beyond current cloud and server builds and into the next phase of AI spending, where networking plays a bigger role.
What could drive Celestica higher
- Hyperscaler AI and cloud programs ramp on schedule, driving a stronger second-half shipment rebound.
- Higher-value networking and platform products expand mix, supporting margin strength and faster EPS growth.
- Confidence builds around the 2027 CPO program, signaling deeper exposure to AI networking beyond current cycles.
- Investors begin to view Celestica as a higher-quality earnings story, supporting a valuation re-rating.
What could pressure CLS stock
- Second-half ramp falls short, turning 2026 guidance into a headwind instead of a catalyst.
- Margins compress if revenue mix shifts back to lower-value programs or profitability weakens at scale.
- Hyperscaler deployment delays push revenue out, making growth look timing-driven rather than demand-driven.
- Customer concentration creates volatility if a major program slows or pauses.
- Long-term AI positioning weakens if networking wins don’t translate into broader platform share.
Key takeaways for Celestica
Celestica’s selloff reflects sky-high expectations and concerns about a steep second-half ramp. The underlying business delivered strong results, including a double beat and raised guidance, and continues to strengthen its long-term AI-driven growth story.
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