Amkor Technology (AMKR) Q3 2026 earnings review
Amkor's profit margins rise, but its sales growth stops
Amkor earned wider profit margins by packaging more data center and car chips, even as total sales stood still. Revenue was $1.99 billion as an intentional pullback in smartphone module work offset records in computing and automotive, while gross margin rose 4 percentage points from a year ago to 18.3%. However, chief executive Kevin Engel's profit improvement fell 0.2 points short of the company's own gross margin plan, and a lower tax bill kept per-share profit inside the target range.
| Revenue | $1.99B +0.2% from a year ago (+4.9% from last quarter) |
|---|---|
| Gross margin | 18.3% +4.0 percentage points from a year ago (plan: 18.5–19.5%) |
| Profit per share | $0.76 +49% from a year ago |
| Full-year capital spending outlook | Cut to ~$2.5B from $2.5–3.0B previously |
⚖️ Verdict: ⚪ Neutral
The story is unchanged because the shift to higher-margin chips is working, but it moved slower than management planned. By our math, data center and computing sales grew 24% from last quarter instead of the 30% target, breaking a three-quarter streak of beating the company's own outlook. On the positive side, Amkor trimmed its full-year factory budget to $2.5 billion, bought back $32 million of stock, and plans to hold an 18.5% gross margin next quarter.
The question now is whether data center packaging can grow fast enough to pay for Amkor's factory buildout before U.S. start-up costs hit in 2027. One side sees customer prepayments and 18% gross margins as proof of lasting pricing power; the other sees flat sales and a $1.3 billion fourth-quarter factory bill by our math draining cash. Fourth-quarter gross margin and cash capital spending will show which view is right.
🐂 Bull Case
Data Center and Auto Chips Lift Gross Margin
Amkor packages and tests chips after foundries manufacture them, and it is shifting factory space away from material-heavy smartphone modules toward data center and automotive chips. Chief executive Kevin Engel pointed to "record revenue in Computing and Automotive & Industrial end markets and continued margin expansion, despite expected weakness in Communications". Because computing and car chips carry less purchased component cost than phone modules, profitability rose even though total revenue barely grew from a year ago.
- Gross margin: 18.3%, up 4.0 percentage points from a year ago and 1.5 points from last quarter
- Materials cost (cost of components inside the package): 50.7% of sales, down 6.8 percentage points from a year ago
- Computing and automotive share of sales: 48% combined, up from 35% a year ago
- Fourth-quarter gross margin outlook: 18.0% to 19.0%
This matters because the fourth-quarter outlook keeps gross margin at 18.5% at the middle of the range even as total revenue steps down 2% from the third quarter. The higher margin is holding without help from higher sales volume.
What to watch: fourth-quarter materials cost as a share of sales. Another reading near 51% would confirm that data center and automotive mix keeps gross margin above 18% during the winter smartphone slowdown.
Standard Wirebond Packaging Grows for a Sixth Quarter
Mainstream products — traditional wirebond packaging where thin wires connect a chip to its frame, used heavily in cars and industrial gear — grew 18.5% from a year ago and 5.3% from last quarter to $359 million. That marks a sixth straight quarter of annual growth for the older product line, while Advanced products (flip chip, memory and wafer-level packaging) slipped 3.1% from a year ago to $1,632 million on lower phone demand.
The steady recovery in Mainstream products matters because Amkor's older factories in Japan and the Philippines have carried high fixed costs on half-empty lines. Filling those lines raises overall factory utilization and supports gross margin while the company restructures its Japanese plants through 2027.
What to watch: fourth-quarter Mainstream revenue. Holding above $340 million would keep older factories loaded while smartphone packaging drops.
First Stock Buybacks and a Lower Capex Ceiling
The board approved a $300 million share buyback plan in April 2026 but bought nothing in the second quarter. In the third quarter, the chip packager spent $32 million to repurchase shares while also trimming its full-year capital spending plan from a range of $2.5 billion to $3.0 billion down to about $2.5 billion.
Cutting $500 million from the top of the equipment and building budget reduces cash burn during a heavy construction year, and starting repurchases shows the April authorization was not just for show.
What to watch: fourth-quarter share repurchases in the full-year cash flow statement. Continued buying during the heaviest quarter for factory spending would show confidence in cash reserves.
🐻 Bear Case
Gross Margin Missed Its Target as Compute Lagged
Engel said Amkor is "advancing key customer programs" with "continued margin expansion". Three months ago, the company forecast a third-quarter gross margin of 18.5% to 19.5% and said Computing sales (chips for data centers, PCs and storage) would jump nearly 30% from the second quarter as high-density fan-out (HDFO) packaging for data center processors ramped up.
Instead, gross margin finished at 18.3%, missing the bottom of the company's plan and breaking a three-quarter streak of beating its own targets. By our math, Computing revenue grew 24.0% from last quarter to about $518 million, short of the nearly 30% target, and each new dollar of sales added 48.5 cents of gross profit rather than the 60 cents the plan needed.
Selling, general and administrative expenses (overhead and sales costs) also rose to 5.0% of revenue from 4.2% last quarter after a $21 million property sale gain did not repeat. That left operating margin at 11.3%, at the very bottom of the 11.3% to 12.7% range implied by the prior outlook, while a 17.1% tax rate saved per-share profit from missing.
What to watch: commentary on the conference call and in the quarterly filing on whether component shortages slowed the data center processor ramp. If shortages held back Computing sales, the fourth-quarter gross margin plan of 18.0% to 19.0% faces the same risk.
Smartphone Packaging Shrinks in Its Peak Season
Communications — packaging for smartphones and tablets, still Amkor's largest market at 37% of sales — usually surges in the third quarter ahead of holiday phone launches. This quarter, management moved system-in-package (SiP, which combines several components into one module) production from Korea to Vietnam to free up Korean cleanrooms for data center chips, while phone makers also faced memory chip shortages.
By our math, Communications revenue fell 7.6% from the second quarter and 27.3% from a year ago to about $737 million, pulling total company revenue growth down from 25.6% in the second quarter to 0.2%. The fourth-quarter outlook calls for total revenue of $1.9 billion to $2.0 billion, down 2.0% from the third quarter at the middle of the range.
What to watch: whether Communications share of sales falls again in the fourth quarter. Management previously warned the phone module transition would weigh on results through the first half of 2027.
Fourth Quarter Requires Half the Year's Factory Spending
Amkor is building a new advanced packaging campus in Arizona and expanding cleanrooms in Korea, Taiwan and Vietnam. Supporters note that customers are helping fund the buildout through prepayments, and Engel cited "expanding customer commitments that improve visibility". On the balance sheet, non-current restricted cash rose by $130 million since December to $198 million and other non-current liabilities rose by $59 million from June to $624 million, reflecting customer advances.
- Third-quarter capital spending: $548 million (27.5% of sales), by our math from nine-month cash flows
- Third-quarter free cash flow (operating cash flow minus capital spending): negative $62 million by our math, bringing the nine-month total to negative $368 million
- Capital expenditures payable (unpaid bills for equipment and construction): $496 million, more than double the $244 million at year-end
- Fourth-quarter capital spending implied by the ~$2.5 billion full-year plan: $1,263 million by our math
Even after trimming the full-year budget to $2.5 billion, the company must pay out more for factories and equipment in the fourth quarter alone than in the first nine months combined ($1,237 million). That spending arrives more than a year before the Arizona plant starts production in early 2028, and customer prepayments will later be returned as credits when services are delivered.
What to watch: fourth-quarter cash payments for property, plant and equipment against the $496 million of unpaid capital bills. A payout above $1.2 billion will drain cash reserves unless new customer advances arrive first.
Risks this quarter didn't answer
Four standing concerns from prior quarters received no new figures in the earnings release and depend on the conference call or quarterly filing.
- Customer-supplied material shortages: no update in the release on whether advanced silicon, substrate or memory bottlenecks held back third-quarter Computing growth; the call will test this.
- Arizona start-up margin drag: no update on the projected 1 to 2 percentage point operating margin dilution in 2027 before production starts in 2028.
- Convertible debt dilution: $1.15 billion of zero-coupon notes remain on the balance sheet, with $56 million spent earlier this year on capped calls to limit share dilution.
- Next-generation bridge packaging: no update in the release on progress toward 2028 bridge-based chip packaging technologies.
💲 Other KPIs
Inventories rose 7.7% from last quarter and 37.9% since December 2025, outpacing third-quarter sales that grew 4.9% sequentially and 0.2% from a year ago. Because Amkor bought less raw material as a share of sales as phone modules shrank, the rising inventory stockpile warrants watching against the 2.0% sequential sales drop planned for the fourth quarter.
EBITDA — net income before interest, taxes, depreciation and amortization — rose 27.9% from a year ago and 8.8% from last quarter, reaching 21.8% of sales. Management tracks this measure to judge capacity to service $2.5 billion of total debt, which sits just above the company's $2.4 billion in cash and short-term investments.
Income tax expense was $39.2 million on $230.2 million of pre-tax profit, up from 13.9% in the second quarter (which had $14 million of one-off tax benefits) but well below the 23% to 25% second-half rate implied by the company's earlier 20% full-year tax plan. By our math, the lower rate added about $0.06 to per-share profit.
🔮 Guidance
New. The plan puts fourth-quarter sales at $1.95 billion at the middle of the range, down 2.0% from the third quarter and up 3.3% from a year ago. That extends the flat annual revenue stretch that started in the third quarter as smartphone module work moves from Korea to Vietnam.
New. At the 18.5% middle of the range, the US chip packager plans for gross margin to rise 0.2 percentage points from the third quarter and 1.8 points from a year ago, even on slightly lower sales. However, the third quarter missed its 18.5% to 19.5% target by 0.2 points from the bottom of the range.
New. The middle of the range ($172.5 million) is down 9.5% from the third quarter and up 0.4% from a year ago, when fourth-quarter profit included a property sale gain.
New. Profit per share is planned at $0.70 at the middle of the range, down from $0.76 in the third quarter and up 1.4% from $0.69 a year ago. That brings full-year per-share profit to about $2.49 at the middle of the range, matching the company's 2028 target two years early before Arizona start-up costs begin in 2027.
Cut. Management lowered the full-year capital spending plan to the bottom of the $2.5 billion to $3.0 billion range it had held for three quarters. Because cash capital spending totaled $1,237 million across the first nine months, the updated target still leaves $1,263 million to be paid in the fourth quarter by our math.
❓ Key Questions
Why did Computing growth and gross margin miss the plan?
Computing grew about 24% sequentially by our math against a ~30% target, and gross margin of 18.3% missed the 18.5% to 19.5% plan. Did customer silicon or substrate shortages hold back the data center processor ramp?
Will fourth-quarter cash capital spending really reach $1.26 billion?
Nine-month capital payments are $1,237 million and unpaid capital bills sit at $496 million. Does the ~$2.5 billion full-year target mean cash payments will more than double in the fourth quarter, or does it include unpaid year-end accruals?
How much customer prepayment cash arrived in the third quarter?
Non-current restricted cash rose by $130 million since year-end and other non-current liabilities rose by $59 million in the quarter. How much of the previously discussed $300 million and $1.5 billion customer advance agreements has been collected?
Why did inventories rise 8% ahead of lower fourth-quarter sales?
Inventories reached $604 million, up 38% since December, even as material-heavy smartphone modules fell to 37% of sales and fourth-quarter revenue is planned down 2% sequentially. Which product lines are building inventory?