Infineon Caught in the Crossfire as Chip Sector Contagion Deepens Ahead of Earnings

Infineon shares plunge 6.6% as STMicro's weak guidance and Texas Instruments' cautious outlook spark sector-wide selloff, highlighting stretched valuations and investor jitters.

The selloff in European semiconductor stocks gathered pace on Thursday, with Infineon bearing the brunt of a sector-wide rout triggered by disappointing guidance from a key rival. Shares in the German chipmaker tumbled 6.6 percent to close at €65.06, extending the stock’s 30-day decline to 17.5 percent and making it the worst performer in the DAX index.

The pressure came from two directions. STMicroelectronics slashed its third-quarter revenue forecast to $3.7 billion, sending its own shares into a tailspin and dragging down peers across the continent. BE Semiconductor, Melexis, and Infineon all opened sharply lower. The damage was compounded by Texas Instruments, which saw its stock fall nearly 6 percent in pre-market trading despite raising its own outlook — a move that market observers attributed to the heavy overlap in customer bases, with both companies heavily exposed to automotive and industrial clients.

Jefferies analyst Janardan Menon pointed to a potential culprit behind STMicro’s cautious stance: the iPhone 18 production ramp may be slower than anticipated, he wrote, adding that the implied annual revenue target for STMicro also fell short of his estimates. The warning sent ripples through the supply chain, hitting chip suppliers across the board.

The ferocity of the reaction underscores just how jittery investors have become after a blistering rally. Infineon had surged 73 percent since the start of the year, leaving the stock priced at a trailing price-to-earnings multiple of over 43 — a historically elevated level, according to Warburg Research. That valuation leaves little room for disappointment, and Thursday’s move suggests a portion of those gains had simply run ahead of the fundamentals.

Analyst opinions remain sharply divided. Bank of America sees fair value at €108, while UBS holds a neutral stance with a price target of just €61 — a spread of €47 that reflects deep uncertainty about the company’s trajectory. Berenberg’s Tammy Qiu, who visited Infineon’s new Dresden fab in early July, struck an optimistic note, lifting her target from €70 to €100 and reiterating a buy rating. She argued the facility and other sites could generate roughly €30 billion in additional revenue without requiring a new cleanroom. Menon at Jefferies also kept a buy rating with a €96 target, citing robust demand from AI, automotive, and industrial end markets, alongside persistent supply constraints for advanced power chips.

Infineon is currently in a quiet period ahead of its third-quarter results, due August 5. Management is barred from commenting on current trading, leaving the stock without a defensive anchor in a nervous market. The company has previously guided for revenue of around €4.1 billion in the current quarter, an 8 percent sequential increase, but the STMicro precedent serves as a cautionary tale: solid results alone may not be enough if expectations have already been priced in.

Technically, the stock now sits 13.8 percent below its 50-day moving average of €75.45, and the relative strength index of 40 points to clear weakness without signaling an oversold condition. The 30-day annualized volatility has climbed to 64.6 percent, a measure of the frayed nerves gripping the market. Still, the longer-term picture offers some reassurance: Infineon remains 30.6 percent above its 200-day average of €49.82, suggesting the broader uptrend has not yet broken.

For now, the chip sector itself remains the dominant driver. Any fresh turbulence at STMicroelectronics or Texas Instruments is likely to reverberate through Infineon’s stock until the company can speak for itself on August 5.