Ambiq (AMBQ) Q3 2026 earnings review
Ambiq raises its sales plan, but chip design costs climb
Ambiq, a maker of low-power AI chips for smartwatches and sensors, unlocked more factory supply while its chip-design bills kept climbing. Third-quarter sales more than doubled from a year ago to $38 million, and gross margin excluding one-offs reached 49% as customers bought higher-priced chips. Chief executive Fumihide Esaka set a fourth-quarter sales plan of about $44 million, above what the company's prior full-year plan pointed to by our math.
| Net sales | $38.1M +110% from a year ago |
|---|---|
| Gross margin, excluding one-offs | 48.7% +3.9 percentage points from a year ago |
| Customers above $1M in quarterly sales | 7 3 a year ago |
| Full-year net sales implied by Q4 plan | Raised $6M middle of the range: $141.1M vs ~$135M prior |
⚖️ Verdict: 🟢 Bullish
The story got better because Ambiq secured the factory capacity to raise its fourth-quarter sales trajectory and added four more million-dollar customers over the past year. One caution: standard operating loss stayed at $10 million as stock-based pay nearly doubled, and the fourth-quarter plan adds $3 million in sequential operating expenses to finish two next-generation chip designs while supplier costs cap gross margin.
The question now is whether this sales surge reflects broad, durable adoption across new customers or a concentrated launch cycle among its top three wearable-device buyers. If the seven million-dollar customers are broadening the base, top-three share will fall and growth will hold when tough comparisons arrive in early 2027; if three buyers still drive nearly four-fifths of revenue, any pause in their orders will stall the ramp. The customer concentration note in the upcoming 10-Q filing and the first-quarter 2027 outlook will tell.
🐂 Bull Case
New Capacity Lifts the Fourth-Quarter Sales Plan
Ambiq designs low-power computer chips that run artificial intelligence on battery-powered devices like smartwatches. Three months ago, management said tight factory supply would cap second-half sales and pointed to roughly $135 million for the full year. This quarter, chief executive Fumihide Esaka cited "strong supply chain partnerships that enabled us to secure capacity and meet growing customer needs".
- Third-quarter net sales: $38.1 million, up 110% from a year ago and 12.5% from last quarter
- Fourth-quarter net sales plan: $43.5 million to $44.5 million, up 112% from a year ago at the middle of the range by our math
- Full-year net sales implied by the fourth-quarter plan: $141.1 million by our math, up $6.1 million from the prior target
Securing more wafers and packaging capacity let the Austin chipmaker beat its third-quarter range and set a fourth-quarter plan 11% above what its prior annual target left over, by our math. Notice that the 110% growth rate also compares against a weak period last year when Ambiq exited lower-margin sales in China.
What to watch: the first-quarter 2027 sales outlook on the next earnings call. Starting in the first quarter, Ambiq compares against this year's 59% and 90% surges, so sequential dollar growth will matter more than the year-over-year percentage.
Higher-Priced Chips Push Gross Margin to 48.7%
Ambiq has been shifting customers to newer chip families that run edge AI tasks and carry higher selling prices. That product shift, together with lower manufacturing waste, lifted gross profit faster than revenue in the third quarter.
Cost of sales — the direct cost of making its chips — fell by 4.5 percentage points of revenue from a year ago to 53.3%, by our math. That lifted standard gross margin by 4.4 percentage points to 46.7%. Excluding one-offs, gross margin rose 3.9 percentage points from a year ago to 48.7%, beating the middle of the company's plan by 1.7 percentage points for a third straight quarter.
What to watch: gross margin excluding one-offs in the fourth quarter against the flat 48.7% plan. Holding that level would show higher-priced AI chips can absorb rising foundry and packaging bills.
More Customers Cross One Million Dollars
A key question for Ambiq is whether demand extends beyond its three biggest wearable-device buyers. In the third quarter, the chipmaker grew its active customer list by about 50% from a year ago. Seven customers each generated more than $1 million in quarterly net sales, up from three in the same quarter last year.
To win those chip designs, the group gives engineers software tools to shrink AI models onto small batteries. This quarter it released heliaPROFILER, a tool for measuring how an AI model runs on a chip, and heliaAOT 1.0, a compiler that translates AI code for its hardware. Those brought its 2026 software launches to seven.
What to watch: the top three customers' combined share of third-quarter sales in the upcoming 10-Q filing. A drop below last quarter's 77.5% would show the four additional million-dollar buyers are reducing reliance on the top three.
🐻 Bear Case
Chip Development Costs Keep Ambiq in the Red
Sales more than doubled from a year ago, yet Ambiq's standard operating loss did not budge. Loss from operations was $10.03 million in the third quarter compared with $10.04 million a year earlier, because engineering and overhead spending rose by $10.1 million alongside gross profit.
- Fourth-quarter operating expense plan, excluding one-offs: $25.5 million to $26.5 million, up from $22.8 million in the third quarter
- Stock-based compensation: $4.0 million in the third quarter, up 94% from $2.1 million a year ago by our math
- Share count for loss per share excluding one-offs: 24.3 million, up 33% from a year ago after two stock offerings
Third-quarter operating expense excluding one-offs came in $1.7 million below the middle of the plan, but management pushed that spending into the fourth quarter. The fourth-quarter plan includes "Atomiq110 and Apollo340 tape-out costs and other investments to support our product development roadmap" — the final design step before sending those two next-generation chips to the factory. By our math, full-year operating expense excluding one-offs will land near $86.3 million, above the prior $85 million budget.
What to watch: the 2027 operating expense budget when fourth-quarter results arrive. If engineering and license bills keep climbing past $26 million a quarter, break-even moves further above $50 million in quarterly sales.
Supplier Cost Pressure Stalls the Margin Climb
Across the semiconductor industry, rapid demand for AI hardware has tightened capacity for silicon wafers, chip substrates and testing services. That tightness is now showing up in Ambiq's unit costs.
After four straight quarters of expanding gross margin excluding one-offs — from 44.8% a year ago to 48.7% in the third quarter — the company expects fourth-quarter gross margin to be roughly flat "as manufacturing efficiencies and product mix help to offset increased supply chain cost pressure". Even with fourth-quarter sales planned 15% higher at the middle of the range, supplier pricing is absorbing the gain from higher-priced chips.
What to watch: commentary on 2027 foundry and packaging pricing on the conference call. If supplier price hikes outpace customer migration to newer chips, gross margin will struggle to reach 50%.
Risks this quarter didn't answer
Four standing items cannot be checked from the earnings release alone because the details live in the quarterly 10-Q filing or on the conference call.
- Top-three customer share: stood at 77.5% of sales in the second quarter; Note 2 of the 10-Q will show whether the seven million-dollar customers reduced that concentration.
- Factory purchase commitments and pre-ordering: commitments quadrupled from a year ago to $32.2 million in the second quarter; Note 5 of the 10-Q will show whether commitments kept rising faster than inventory.
- Mainland China sales share: rose to 13.7% of end-customer sales in the second quarter despite an earlier exit from lower-margin China business; Note 10 of the 10-Q will report third-quarter geographic exposure.
- Apollo 330 Plus and Apollo 510 Lite revenue: management previously slated both new chip families for first revenue in the third quarter; the release cites broad demand across product families without naming them.
💲 Other KPIs
Inventory on the balance sheet rose 2.3% from last quarter and 86.4% from a year ago, by our math, after jumping 73% over the first half of 2026 to prepare for second-half shipments. By our math, the fourth-quarter sales plan equals 1.46 times third-quarter ending inventory, up from 1.30 times achieved in the third quarter.
Uncollected customer bills rose 171.5% from $7.0 million a year ago and 161.0% from $7.3 million at the end of December, by our math, outpacing the 110.0% rise in third-quarter net sales. That $11.7 million build in customer receivables was the single largest working-capital drain on operating cash over the first nine months of 2026.
Ambiq used $25.4 million of cash in operations over the first nine months, up from $15.6 million a year ago because of inventory and receivable builds. By our math, third-quarter operating cash burn narrowed to $4.7 million from $9.5 million in the second quarter, leaving $363.5 million in cash after two stock offerings.
🔮 Guidance
Raised. The fourth-quarter plan calls for 112.1% growth from a year ago and 15.4% growth from the third quarter at the middle of the range, by our math. That lifts full-year implied sales to $141.1 million, $6.1 million above the prior ~$135 million target. Ambiq beat its quarterly sales midpoint four straight times by an average of 9.5%; if the pattern holds, fourth-quarter sales would reach $48.2 million by our math.
Unchanged. Management expects gross margin excluding one-offs to hold near the third quarter's 48.7%, up 3.2 percentage points from 45.5% in the fourth quarter of last year. Product mix and factory yield gains are offsetting higher supply-chain costs, keeping the full-year margin well above 2025's 45.0%.
Raised. The plan steps operating spend up by $3.2 million from the third quarter at the middle of the range — a 14.3% sequential jump and 56.6% above a year ago, by our math. Final chip-design tape-out costs for Atomiq110 and Apollo340 drive the increase and push implied full-year spend to $86.3 million, above the prior ~$85 million budget.
New. At the middle of the range, the planned loss of $0.06 per share on 24.6 million shares is 1 cent wider than the third quarter's $0.05 loss, as higher chip-design costs offset the $5.9 million sequential jump in planned sales. Compared with a year ago, the loss narrows by 81.3% from $0.32 per share by our math.
❓ Key Questions
Did the top three customers' revenue share fall in Q3?
Seven customers each bought over $1 million in the third quarter, up from three a year ago, but the top three still made up 77.5% of sales in the second quarter. The 10-Q concentration table will show whether reliance on those three buyers actually dropped.
Did Apollo 330 Plus and 510 Lite record first sales?
Management previously committed to initial third-quarter revenue from the Apollo 330 Plus and Apollo 510 Lite chip families ahead of customer device launches early next year. The earnings release did not confirm whether either product shipped for revenue.
Where is the new revenue break-even mark as costs rise?
Earlier this year management put break-even near $47 million in quarterly sales, then backed away from timing in the second quarter. With fourth-quarter operating expense planned at $25.5 million to $26.5 million, investors need the updated 2027 expense run-rate after chip tape-outs finish.
How much of the 2027 order book remains supply-capped?
Extra factory capacity lifted the fourth-quarter outlook by $4.5 million above what the prior annual plan implied, yet inventory rose only 2.3% sequentially to $30.1 million. Management has not quantified how much customer demand remains unmet or how much wafer supply is locked in for 2027.