Celestica (CLS) Q3 2026 earnings review
Celestica plans to nearly double 2027 sales, but cash drops
Celestica, which designs and builds data center hardware, is growing almost twice as fast as a year ago while pouring cash into parts and factories. Third-quarter sales rose 83% and operating margin excluding one-offs reached a record 8.5%, beating the top of the company's own plan. Chief executive Rob Mionis raised the 2026 revenue and profit targets again, while cutting the 2026 free cash flow plan to $460 million to buy inventory for next year.
| Revenue | $5.83B +83% from a year ago |
|---|---|
| Profit per share, excluding one-offs | $3.30 +109% from a year ago |
| 2026 free cash flow outlook | Cut $140M to $460M on inventory build |
| Initial 2027 revenue outlook | $40.0B +90% from the 2026 plan |
⚖️ Verdict: 🟢 Bullish
The story got better because management put hard numbers on 2027 and they far exceeded its earlier floor. Instead of just beating this year's 69% pace, the initial 2027 plan calls for revenue to nearly double to $40 billion, while the industrial and defense division also accelerated to 23% growth. One caution: gross margin slipped half a percentage point as standard server assembly outgrew custom hardware, and the 2027 factory bill stepped up to as much as $2 billion.
The question now is whether a handful of cloud giants can deploy $40 billion of hardware next year without a pause or a supply bottleneck. Either contracted switch and custom rack programmes lock in that step-up, or parts shortages and customer delays leave Celestica holding $4.5 billion of inventory and new factory overhead. The quarterly filing's customer concentration table and 2027 progress updates will tell.
🐂 Bull Case
2027 Outlook Calls for 90% Revenue Growth
Celestica builds servers, network switches and storage gear for large cloud and artificial intelligence (AI) companies. Last quarter the electronics manufacturer promised that 2027 revenue growth would beat its 2026 pace. Chief executive Rob Mionis now says: "We are also pleased to provide our initial 2027 annual outlook, with revenue of $40.0 billion, up 90%, record adjusted operating margin (non-GAAP)* of 9.0% and adjusted EPS (non-GAAP)* of $21.50."
That $40 billion target requires $19 billion of new sales next year, nearly matching the company's entire $21 billion outlook for 2026. The Canadian group also noted that customer demand plans for 2028 are "meaningfully higher than our 2027 revenue outlook". This matters because Q3 revenue of $5.83 billion, up 83% from a year ago, already beat the top of its prior range by $280 million.
What to watch: customer concentration in the third-quarter filing. Three buyers made up 63% of sales last quarter, so a deployment delay at one customer would slow the 2027 ramp.
Lower Overhead Costs Lifted Operating Margin to 8.5%
"Our adjusted operating margin (non-GAAP)* of 8.5% represents another new high for the company, demonstrating the strength of our operational execution," Mionis said. Connectivity and Cloud Solutions (CCS), the division that builds data center hardware, lifted its segment margin to 8.9% from 8.3% a year ago as sales more than doubled to $4.87 billion.
- Gross margin, excluding one-offs (profit after cost of making the products): 11.2%, down 0.5 percentage points from a year ago
- Selling and administrative overhead, excluding one-offs: 1.8% of revenue, down 1.2 percentage points
- Research and development: 0.9% of revenue, down 0.3 percentage points by our math
This cost split matters because product costs are taking a bigger bite out of every sales dollar. The hardware maker still expanded its operating margin by 0.9 percentage points because administrative and research budgets grew much slower than revenue. The 2027 plan calls for a 9.0% operating margin, which relies on keeping overhead tight while factories scale.
What to watch: gross margin, excluding one-offs, in Q4. A drop below 11% would mean low-margin server assembly is outgrowing custom engineering and forcing overhead cuts to do all the work.
Industrial and Defense Segment Growth Reached 23%
Advanced Technology Solutions (ATS), which makes equipment for aerospace, defense, industrial and health-tech customers, spent 2025 exiting low-margin contracts. After shrinking 4% a year ago and growing 8% in Q2, the division's revenue rose 23% from a year ago to $960 million in Q3, beating management's mid-teens forecast.
Segment margin in ATS reached 6.6%, up 1.1 percentage points from 5.5% a year ago and 6.3% last quarter. That gives the Toronto-based group a second profitable growth driver alongside its data center business, even though CCS now brings in 84% of total sales by our math.
What to watch: the 2027 growth forecast for ATS at the investor day. Another double-digit year would show that semiconductor and industrial equipment demand has entered a multi-year recovery.
🐻 Bear Case
Working Capital and Factory Bills Cut Free Cash Flow
Doubling revenue in a hardware business requires buying parts and building factories months before customers pay. Celestica cut its 2026 free cash flow outlook from $600 million to $460 million, blaming "targeted working capital investments to support the accelerating growth in 2027". It also set its 2027 capital spending plan at $1.5 billion to $2.0 billion, up from a $1.5 billion placeholder last quarter.
- Ending inventory: $4.51 billion, up $1.11 billion from last quarter and up 120% from a year ago by our math
- Accounts payable (bills owed to suppliers): $5.04 billion, up 200% from a year ago by our math
- Q4 free cash flow implied by the full-year outlook: $47.5 million, down 70% from a year ago by our math
Suppliers are financing most of the parts build right now, because unpaid supplier bills rose $1.49 billion in Q3 while inventory absorbed $1.11 billion of cash. If suppliers tighten payment terms or a customer delays a server launch, that cash burden falls straight onto the balance sheet.
What to watch: customer cash deposits and receivables sold in the Q3 filing. A drop in customer pre-funding as a share of inventory would mean Celestica and its suppliers carry more of the ramp risk.
Custom Platform Share of Cloud Sales Fell Again
Hardware Platform Solutions (HPS), where Celestica designs its own switches and servers rather than assembling a customer's blueprint, carries higher margins than standard assembly. In Q3, HPS revenue grew 70% from a year ago to about $2.3 billion. That trailed the wider CCS cloud division, which grew 102% to $4.87 billion.
By our math, HPS fell to 47.2% of cloud division sales and 39.5% of total company revenue, down from 58.0% of cloud sales and 43.8% of total revenue a year ago. While Mionis highlights record operating margins, standard server assembly is growing faster than custom design, which explains why gross margin excluding one-offs slipped 0.5 percentage points to 11.2%.
What to watch: Networking versus Compute & Storage sales in the Q3 filing. Faster growth in compute assembly than in networking switches would keep pressure on gross margins into 2027.
Risks this quarter didn't answer
Five standing concerns and milestones from last quarter cannot be checked from the earnings release alone and await the quarterly filing or investor day.
- Customer concentration: three buyers made up 63% of revenue in Q2; Note 3 of the Q3 filing will show if concentration rose again.
- 1.6-terabit switch and OpenAI rack ramps: the release gives no product milestones; investor day remarks will show if mass production and sample deliveries started on time.
- Component shortages: lead times exceeded 52 weeks last quarter; management's call commentary will show whether part supply still caps revenue.
- Off-balance-sheet cash support: Q2 relied on $565 million of receivables sales and $481 million of customer deposits; the Q3 filing will update both figures.
- Tax incentives: the 2027 outlook assumes a 21% tax rate, up from 18% in Q3, as Thailand tax holidays near expiration between 2027 and 2029.
👓 Other Themes
Share Sale Raises $3.45 Billion Ahead of Buyback
Celestica issued 11.1 million new shares in August for $3.45 billion in gross proceeds ($3.39 billion net of fees), lifting its diluted share count by 5.1% from a year ago to 121.8 million and taking cash on hand to $3.96 billion. The company also plans to launch a new buyback programme in Q4 for up to 2.5% of its public float, half the 5% cap of last year's unused plan.
💲 Other KPIs
Return on invested capital (ROIC) — annualized operating profit excluding one-offs divided by average net capital tied up in the business — rose to 64.7% from 55.5% last quarter and 37.5% a year ago. Operating profit more than doubled while supplier bills offset the surge in inventory and factory spending.
Unpaid customer bills rose 54.3% from a year ago and 12.7% from last quarter, growing much slower than the 82.5% jump in revenue. That gap kept cash collection healthy, though the quarterly filing will show how much came from selling receivables to banks.
Reported profit grew 48.3% from a year ago, slower than the 119.6% rise in profit excluding one-offs. The difference comes from Celestica's total return swap (a contract tied to its own stock), which recorded a $3.9 million loss in Q3 against a $113.3 million gain a year ago.
🔮 Guidance
Raised. The middle of the range calls for $6.425 billion, or 75.8% growth from a year ago and 10.2% from Q3 by our math. That sits $71 million above what the prior full-year plan implied for Q4. Celestica has beaten its quarterly revenue midpoint by an average of 6.1% over the last four quarters; if the pattern holds, Q4 revenue would reach $6.82 billion by our math.
New. The middle of the range is $3.47, up 83.6% from a year ago and 5.2% from Q3 by our math. The slowdown from Q3's 108.9% growth rate reflects a 20% expected tax rate (up from 18% in Q3) and the full-quarter count of the 11.1 million shares issued in August.
Unchanged against the bottom of the prior implied range. The 8.7% target at the middle of the revenue and profit ranges would mark another company record, up 0.2 percentage points from Q3 and 1.0 percentage point from Q4 last year.
Raised. The $500 million increase takes full-year growth to 69%. It is the fourth raise in four quarters, and the smallest so far as the year nears its close: +$1.0B, +$2.0B, +$1.5B, +$0.5B.
Raised. The $0.25 increase brings full-year profit per share growth to 91%, absorbs the August share issuance, and marks the fourth consecutive raise (+$0.55, +$1.40, +$1.15, +$0.25).
Unchanged. With the first nine months at 8.3% and Q4 planned at 8.7%, the full-year 8.4% target is well in hand, up from 7.5% in 2025.
Cut. The $140 million reduction leaves full-year cash generation barely above 2025's $458.3 million (+0.4% by our math). With $412.5 million generated in the first nine months, the plan leaves $47.5 million for Q4 by our math, down 70% from $155.9 million in Q4 last year as inventory builds for 2027.
Raised from a qualitative floor to a dollar target. The $40.0 billion plan represents 90% growth over the raised 2026 outlook, far above the prior promise to beat 65% growth.
Consistent with the prior view. The $21.50 target represents 86.1% growth over the 2026 plan by our math, slightly below the 90% revenue pace only because the August share sale increases the 2027 share count.
Raised to a specific 9.0% record target, up 0.6 percentage points from the 2026 plan as factory scale offsets higher depreciation.
Raised. The top half of the range sits up to $500 million above the prior placeholder, representing 3.8% to 5.0% of planned 2027 revenue by our math.
❓ Key Questions
How did cloud revenue split between networking and compute?
Celestica renamed its Communications and Enterprise lines to Networking and Compute & Storage, but omitted their Q3 sales from the release. Because custom networking switches carry higher margins than server assembly, that split explains the 0.5-point gross margin drop.
Why raise $3.45 billion in stock right before a buyback?
The company sold 11.1 million shares in August, ended Q3 with $3.96 billion in cash, and now plans a buyback for up to 2.5% of its float. Investors need to know what acquisition or factory bill required that cash buffer.
How much of the $40 billion 2027 outlook is consigned?
In consigned contracts like the OpenAI rack programme, customers own the chips and Celestica books only assembly fees, not material costs. Knowing the consigned share of 2027 sales will show the true physical scale of the ramp.
Did customer cash deposits keep pace with the $4.51 billion inventory?
Inventory rose $1.11 billion in Q3 while the full-year free cash flow target fell by $140 million. Last quarter customer deposits covered only 14% of inventory, down from 21% a year earlier; the Q3 deposit and receivables-sale figures will show who is funding the working capital.