Celestica, Inc. (CLS) Stock Price & How to Invest

Celestica is a Toronto-based electronics manufacturing services (EMS) and supply-chain company that designs, builds, and tests hardware for other companies. It reports in two segments. Connectivity & Cloud Solutions (CCS) is the larger and faster-growing one, serving data-center and communications customers with networking switches, servers, storage, and increasingly custom AI/ML compute hardware; in Q1 2026 CCS was about ~80% of total revenue and grew roughly ~76% year over year, with hyperscaler customers making up the majority of that segment. Advanced Technology Solutions (ATS) is the diversified segment covering aerospace and defense, industrial, HealthTech, and capital equipment. The company makes money on the volume and complexity of the hardware it manufactures and on higher-value design and joint-design-manufacturing (JDM) work, where margins are structurally better than commodity contract assembly.

Historically Celestica was a lower-margin, lower-multiple contract manufacturer competing on scale and efficiency. The shift toward AI infrastructure changed the story: demand for 800G networking switches and next-generation AI/ML compute programs from a concentrated set of hyperscaler customers drove rapid revenue growth and modest margin expansion, and the stock re-rated sharply as investors began treating it as an AI-infrastructure play rather than a traditional EMS name. Management has repeatedly raised guidance through 2025 and into 2026 on that demand.

Customer concentration is the headline risk: as of Q1 2026 three customers each represented at least 10% of revenue (roughly 35%, 15%, and 15%), and the top ten customers made up about ~78% of revenue, so losing or being de-prioritized by a single hyperscaler would matter a lot. EMS has historically run thin margins, leaving limited cushion if pricing or volumes compress. The business is tied to AI capital spending, which is cyclical and could slow or pause after a heavy buildout phase. And the stock has re-rated to a much higher multiple than its EMS history, so it carries both competition from Jabil, Flex, Foxconn, and ODMs and the risk that high growth expectations are not met.

A simple financial snapshot. These are approximations and refresh quarterly; for current figures see Celestica, Inc.'s investor relations page or your broker.

• Q1 2026 revenue: ~$4.05B (up ~53% YoY)
• CCS segment growth: ~76% YoY in Q1 2026 (~80% of revenue)
• 2026 revenue guidance: ~$19B (raised from ~$17B)
• Adjusted operating margin: ~8.0% Q1 2026; ~8.1% 2026 guide
• P/E ratio: ~40-52x (varies by source/date)
• Market capitalization: ~$38-39B

These figures are tied to the June 2026 reporting picture and Celestica's Q1 2026 results announced in late April 2026. The company has repeatedly beaten and raised guidance on AI-driven demand, and its valuation multiple has expanded well above its historical EMS range to reflect those growth expectations. A premium multiple means the stock is more sensitive to any disappointment in growth or margins than a traditional contract manufacturer would be.

There are three common ways to get CLS exposure. Buy shares (or fractional shares) directly at any major broker. Hold an ETF that includes it, which spreads the position across many companies. Or build it into a focused thematic basket, so CLS sits alongside other stocks that express the same thesis.

Walnut takes the basket route. Describe a thesis where CLS fits (for example “AI infrastructure” or “dividend-growth large-caps”) and the AI proposes 5 to 6 constituents with target weights. You review the plan and fund it through your own broker when you're ready.

As of June 2026, Celestica is best understood as an AI-hardware manufacturer riding hyperscaler data-center buildouts: Q1 2026 revenue rose about 53% year over year to roughly ~$4.05 billion, the CCS segment grew about ~76%, and management raised full-year 2026 revenue guidance to roughly ~$19 billion. If you believe hyperscalers keep spending heavily on AI networking and compute and that Celestica keeps winning that work, the question becomes sizing and overlap with the other AI names you already own, not timing; the risk is that a richly re-rated EMS business with a few-customer concentration and historically thin margins is highly exposed to any slowdown in AI capital spending.

Whether CLS is worth buying today depends more on your time horizon and what you already hold than on any single call. We walk through valuation, what would have to go right, and the risks in is CLS a buy?, and where the stock could go from here in the CLS stock forecast.

For income investors, whether CLS pays a dividend and how the payout looks is covered in does CLS pay a dividend?