Amkor plunges 24% despite beating earnings, misses revenue guidance

Amkor Technology reported second-quarter earnings on Monday night that comfortably beat analyst expectations: revenue grew 26% to $1.90 billion（約3000億円）, compared with analyst expectations of $1.82 billion（約2900億円）, while earnings per share surged 218.2% to $0.70, well ahead of the $0.48 estimate. However, the company's forward guidance disappointed on one crucial metric. For the third quarter, Amkor guided revenue of $1.95 billion（約3100億円） to $2.05 billion（約3300億円）—below the consensus analyst expectation of $2.11 billion（約3400億円）. The market's reaction was swift and harsh: Amkor shares plunged 24.1% on Tuesday as of 2:10 p.m. EDT.

The sell-off occurred despite several strong elements in the guidance. Amkor's gross margin guidance of 18.5% to 19.5% significantly exceeded analyst expectations of 16.4%, and EPS guidance of $0.72 to $0.82 beat estimates of $0.63. These stronger margins reflect the strength of Amkor's high-end packaging business within its Computing segment, which serves AI systems and data center customers. The issue is that the Communications segment—which includes smartphones and tablets and accounted for 42% of revenue in the last quarter—is expected to decline in the high single digits sequentially. The company cited a memory supply crunch as the reason for the expected weakness in smartphone unit sales.

Amkor's weakness reflects the current mood in chip stocks more broadly: after a significant run-up over the past year, the sector has become unforgiving, with investors quick to sell on any metric that misses guidance, no matter how narrow. However, the longer-term picture may look different. Amkor plays a vital role in the AI buildout and maintains long-term partnerships with Taiwan Semiconductor Manufacturing and Nvidia. The memory supply crunch affecting smartphones is expected to be temporary. Once it eases, the Communications segment should stabilize, while the Computing segment's strong AI-related growth continues. For investors with a longer investment horizon, the sharp sell-off could present a buying opportunity in a company with structural exposure to the AI infrastructure buildout.

Amkor's earnings miss on guidance reflects broader dynamics in semiconductor stocks: a sharp run-up in valuations over the past year has left investors in a hair-trigger mood, punishing any sign of weakness. Yet the company's underlying earnings quality—with gross margins and EPS guidance both beating expectations—suggests the sell-off may be overdone. The weak spot is the Communications segment's exposure to smartphones, where a memory supply crunch is creating a temporary headwind. This crunch is expected to ease over time, which means the weakness is cyclical rather than structural.

The bull case hinges on Amkor's role in AI infrastructure. Its Computing segment, which packages high-end chips for data center and AI systems, remains strong and benefits from long-term partnerships with Nvidia and Taiwan Semiconductor Manufacturing. Once the memory supply crunch eases and smartphone demand stabilizes, the Communications segment should stabilize, and Amkor's growth profile could re-accelerate. For investors with a longer time horizon, the 24% drop may offer a window to buy a company with integral positioning in the AI buildout at a depressed valuation.

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