CELESTICA INC (CLS) stock intrinsic value fair value estimate & owner earnings analysis

Celestica is a Toronto-based electronics manufacturing services (EMS) provider that designs, builds and services complex hardware on behalf of other companies. It operates through two segments: Connectivity & Cloud Solutions (CCS), which serves cloud, AI-infrastructure and networking customers, and Advanced Technology Solutions (ATS), which serves aerospace & defense, industrial, healthtech and capital-equipment customers. The business has been reshaped over the past three years by the buildout of AI and cloud data-center infrastructure. The Communications portion of CCS - networking and compute hardware for large hyperscale cloud and AI customers - grew from 33% of total revenue in 2023 to 57% in 2025, while the ATS segment has been roughly flat to slightly declining over the same period and the Enterprise portion of CCS (traditional IT hardware) actually fell about 19% in 2025. This growth comes with real concentration: the company's top ten customers accounted for 79% of 2025 revenue, up from 64% two years earlier, and a single customer represented 32% of total revenue in 2025, up from 22% in 2023. Management has committed to roughly $1 billion of capital spending in 2026 (about 6% of revenue, versus a historical range of 1.5%-2.0%) specifically to add capacity for this hyperscaler-driven demand. We value the company on owner earnings - cash generated by the business after working-capital swings, stock-based compensation, and the portion of capital spending needed to maintain (not grow) the existing asset base. Reported figures have grown very quickly: owner earnings per share rose from about $1.81 in 2023 to $2.90 in 2024 to $4.69 in 2025, roughly a 60% increase in the most recent year alone, and revenue growth continued at a similar pace into the first half of 2026. Rather than projecting forward from the single most recent, most elevated year, we used the median of the last three fiscal years (2023-2025) - about $2.90 per share - as the normalized starting point. This avoids extrapolating what could be a single investment cycle tied to one customer relationship, while still reflecting that the business has genuinely and durably shifted toward higher-volume cloud/AI production. Our base case assumes owner earnings grow about 35% in 2026 - below the roughly 60% pace of the most recently completed year - because the capital-spending ramp will itself absorb cash even as revenue keeps climbing, and because competitors are bidding aggressively for this business, which caps how much of the growth converts to profit. Growth then decelerates steadily, to the low teens by year three and to low-single digits by year eight or nine, reflecting that contract electronics manufacturing is a competitive, price-sensitive business with no lasting cost advantage once a customer's investment cycle matures. Beyond the ten-year forecast we assume owner earnings simply hold their year-ten level rather than keep growing, since nothing in the business model supports assuming permanent above-market growth in an industry this competitive. More than half of our estimated value comes from cash flows beyond year ten - the natural result of treating the business as a going concern rather than assuming it disappears - but it also means the estimate leans heavily on Celestica's ability to hold, not just reach, that higher level of earnings. Our bear case assumes the concentration risk actually bites: within the next two to three years the largest customer meaningfully reduces its business with Celestica - through dual-sourcing, in-sourcing, or simply slowing its own capital spending - producing a roughly 20-25% reset in owner earnings around 2027-2028, after which the business grows only slowly (about 2% a year) from a smaller base, more like a traditional, price-competitive EMS business. Even here we still see real, positive value, since this remains a diversified, cash-generative company outside of its largest relationship. Our bull case assumes the AI/data-center capex cycle continues for several more years without a reset, the capacity funded by the 2026 investment program is well utilized and profitable, and Celestica broadens its hyperscaler customer base so growth continues even as concentration gradually eases. Putting these together, our base-case estimate of intrinsic value is about $108 per share, with a bear case near $46 and a bull case near $156. Given how much of the base case depends on a single customer relationship and on a large, not-yet-completed capital-spending program, the margin-of-safety price sits meaningfully below our estimate of fair value - around $65 per share - to allow for that concentration risk actually showing up. One accounting judgment worth flagging: Celestica uses a total-return swap to hedge the cash cost of its stock-based compensation program. That swap produced a $253 million non-cash gain within operating cash flow in 2025 (and smaller gains in prior years). We did not treat this as an add-back to owner earnings because it nets against a matching, non-operating cash settlement of employee equity awards recorded in financing activities, and it is already embedded correctly in reported operating cash flow. We were not able to find comparable owner-earnings data further back than fiscal 2022 in the filings reviewed, so our historical window is limited to 2022-2025 rather than a longer look-back - worth noting given how much the business mix has changed in that period.