Celestica accelerates its AI hardware growth
- Celestica is shifting from contract manufacturing toward higher-value design work for AI data centers.
- Q2 2026 CCS revenue was $3.81 billion, up 84% year over year, making up 81% of total sales.
- Management raised 2026 guidance to $20.5 billion of revenue, projecting a 65% growth rate.
- The company revealed a strategic systems partnership with OpenAI and Broadcom for custom racks.
- The bear case is concentration, with three customers making up 63% of Q2 2026 sales.
AI demand pulls the story forward
Celestica has become a major hardware partner for cloud companies building AI data centers. The key change is speed. In Q2 2026, the company delivered a massive revenue beat at $4.70 billion, driven by intense hyperscaler demand for its connectivity and cloud solutions.
The bull case is that Celestica is moving up the value chain. It is not only assembling boxes. It is helping design advanced networking and compute systems, including 800G switches, future 1.6T co-packaged optics switches, custom AI compute, and liquid-cooled racks. The company recently revealed a strategic systems partnership with OpenAI and Broadcom for custom racks, further validating its market position.
The hard part is that the same demand surge creates stress. Three customers were 32%, 17%, and 14% of Q2 2026 sales, or 63% combined. Management has also cited component shortages, especially in custom silicon, memory, and advanced printed circuit boards.
Finn's view is positive but cautious. Growth is strong, as shown by the new $20.5 billion revenue guidance for 2026. However, the stock now needs Celestica to execute on a $1 billion capital expenditure plan to add capacity. The next proof points are supply availability in the second half of 2026 and clarity on capital intensity for 2027.
From factory floor to design partner
Celestica makes money by designing, sourcing, building, and supporting complex electronics for other companies. Its older model looked more like electronics manufacturing services, where the customer owns most of the product idea and Celestica builds it at scale.
The faster-growing model is closer to an original design manufacturer. In plain English, Celestica helps create the product, not just build it. That matters because design work, engineering know-how, and full-system integration can be harder to replace than basic assembly.
The main growth engine sits in Connectivity and Cloud Solutions, especially Hardware Platform Solutions. This includes high-speed switches, custom AI compute servers, and liquid-cooled rack systems for hyperscalers and digital native customers.
The model can break if parts do not arrive, factories do not come online, or a large customer changes plans. Management expects about $1 billion of capital spending in 2026, meaning execution and cash discipline matter more than they used to.
What Celestica sells
800G networking switches
These switches move data inside large AI and cloud networks. Strong 800G demand remains a major driver of segment growth.
1.6T co-packaged optics switches
Celestica won a landmark 1.6T co-packaged optics Ethernet switch award with a major hyperscaler. This is a future growth path tied to faster AI data movement.
Custom AI compute systems
These systems use customer-designed chips. They are part of Celestica's shift from simple manufacturing to higher-value hardware design and integration.
OpenAI custom racks
A strategic partnership with OpenAI and Broadcom to deliver custom racks, beginning with the Jalapeno accelerator for mass production in 2027.
Liquid-cooled rack solutions
AI systems create a lot of heat, so customers need full racks that include cooling. Celestica's ability to integrate full racks is a key part of its cloud hardware pitch.
AMD Helios scale-up networking switch
Celestica is working with AMD on a scale-up networking switch for the Helios rack scale AI architecture. The open question is how much revenue and margin this program can add in 2027.
Advanced Technology Solutions manufacturing
ATS serves aerospace and defense, industrial, and healthtech markets. This segment provides a steady but slower-growing revenue base outside of cloud data centers.
Cloud hardware now dominates
Segment mix is from Q2 2026. Connectivity and Cloud Solutions (CCS) was 81% of revenue, while Advanced Technology Solutions (ATS) was 19%.
What could break the thesis
Too much revenue tied to three customers
High impact · Medium oddsIn Q2 2026, Celestica's three largest customers were 32%, 17%, and 14% of sales. That adds up to 63%. If one large customer delays a platform or slows AI capex, Celestica's growth could fall fast.
Shortages in critical AI parts
High impact · High oddsManagement has flagged component shortages in custom silicon, memory, and advanced printed circuit boards. Even with strong demand, Celestica cannot ship finished systems if these parts arrive late.
Factory build-out slips
High impact · Medium oddsCelestica expects about $1 billion of capital spending in 2026 to add capacity, and likely similar levels in 2027. If new capacity is late or over budget, the company may not meet demand.
Margins stop expanding
Medium impact · Medium oddsThe bull case assumes Celestica keeps turning engineering work into better profits. Higher input costs, more research and development, and fast capacity growth could put a ceiling on profitability.
New AI programs disappoint
Medium impact · Medium oddsThe OpenAI custom rack partnership, 1.6T optics award, and AMD Helios work help prove Celestica can win advanced programs. If these programs ramp slowly, the 2027 story may look less powerful.
In one breath
What does Celestica actually do?
Celestica designs, sources, builds, and supports complex electronics for large customers. Its fastest growth now comes from AI data center hardware, including networking switches, custom compute systems, and liquid-cooled racks.
Why is Celestica linked to AI?
AI data centers need fast networking and dense compute hardware. Celestica supplies key parts of that infrastructure, including 800G switches, custom AI compute programs, and racks for hyperscaler customers like OpenAI.
What is the biggest risk for Celestica stock?
Customer concentration is the clearest risk. In Q2 2026, three customers made up 63% of sales, so a change in one major customer program could have a large effect.
What should investors watch next?
The main items are whether Celestica can meet its raised $20.5 billion 2026 revenue outlook, whether part shortages ease, and whether 2027 guidance confirms the expected faster growth.
