Amkor Technology

The margin thesis that OSAT bears said was structurally impossible is actually happening: gross margin went 12.0% -> 14.2% -> 16.8% in three quarters and is guided to 18.5-19.5% in Q3, operating margin nearly doubled to 10.5%, and the stock is now ~47% below its 52-week high at roughly 7.9x annualized EBITDA.

• Gross margin expanded 480 bps YoY to 16.8% and is guided to 18.5%-19.5% in Q3 2026 — that would be roughly 650-750 bps above Q2 2025 and far above the ~14% level the business was stuck at, driven by depreciation, labor and other-manufacturing all falling as a percentage of sales on higher utilization
• Operating margin 10.5% vs 6.1% a year ago, and the YoY comparison is understated: Q2 2025 included a $32M one-time operating benefit from the Nanium contingency
• Record net sales of $1,898.0M, +25.6% YoY, with record revenue in Computing and in Automotive & Industrial — the mix is diversifying away from smartphones rather than depending on them
• Customer concentration is actually improving: top-ten customers fell to 66% of sales from 72% a year ago and 68% last quarter — the single biggest structural bear point on Amkor is easing
• Valuation has reset hard: at $50.84 the stock trades ~7.9x annualized Q2 EBITDA ($400M x 4) and ~18x annualized Q2 EPS — back inside the historical OSAT range even as margins run at record levels
• Advanced products are $1,557M of $1,898M (82%) of sales, so the AI/HPC packaging mix shift is already the dominant revenue base, not a future option

The market punished the quarter for a reason: Q3 revenue guidance was light, Communications (42% of sales) is guided down high-single-digits sequentially, free cash flow is deeply negative at -$307M for the half, and the company has added ~$1.04B of debt in six months to fund a capex program that still has no revenue attached to it until ~2028.

• Free cash flow is negative -$306.9M in H1 2026 (operating cash flow $381.6M vs $688.4M of PP&E payments), and the true burn is worse than cash shows: capital-expenditures payable rose to $621.3M from $243.5M, meaning ~$378M of committed capex has not yet been paid
• The capex program is now debt-funded, not self-funded: total debt rose to ~$2,486M from ~$1,445M at Dec 31, 2025 ($1,150M of long-term debt issued in H1, with $56.4M of capped-call payments indicating a convertible), converting the prior ~$0.5B net-cash cushion into roughly zero
• Q3 guidance is the reason the stock fell despite a ~46% EPS beat: net sales of $1.95-$2.05B was light versus expectations, with a high-single-digit sequential decline flagged in Communications — 42% of Q2 revenue
• Communications at 42% of sales means the smartphone cycle, not AI, is still the swing factor; Consumer also fell to 14% of sales from 18% a year ago
• Peak-margin risk: 18.5-19.5% guided gross margin is a record for this business and depends on utilization staying high — the same operating leverage that took margins up 480 bps reverses just as fast, and the company itself flags 'difficulty achieving the relatively high-capacity utilization rates necessary to realize satisfactory gross margins given our high percentage of fixed costs'
• Amkor has no backlog — the company explicitly lists 'our absence of backlog and the short-term nature of our customers' commitments' as a risk factor — so there is no contracted visibility offsetting the ~$2.5-3.0B FY2026 capex commitment