Micron Technology's shares surged 15.7 per cent in premarket trading on Thursday after the company posted a surprise profit and forecast current-quarter revenue above Wall Street estimates on soaring demand for its memory chips used in AI computing. The company's stock was last trading at $111.43, on track to set a record high at market open if gains hold. The Idaho-based firm said its high bandwidth memory (HBM) chips, used in the development of complex AI applications, were sold out for 2024. The company expects the advanced chips to add to its gross margins in the third quarter.

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Micron forecast revenue of $6.60 billion, plus or minus $200 million, for the third quarter, largely above an estimate of $6.03 billion, according to LSEG data. It expects adjusted gross margin in the current quarter to be 26.5 per cent, plus or minus 1.5 per cent, above a market estimate of 20.8 per cent. "Tight supply, increasing demand, normalization of excess inventory coupled with the increased size of HBM (chips) is driving dramatic improvements in pricing," Piper Sandler analysts said in a note.

Analysts expect Micron's share of the high-margin HBM market to grow in 2024. AI bellwether Nvidia has also tapped the firm for the latest HBM chips in its next-generation AI chip. Micron's results, reported ahead of other chipmakers, are watched as an indicator of demand for various types of chips and end-market solutions. "Memory is a key beneficiary of AI adoption, and we expect a V-shaped recovery in the industry, with revenues expected to grow by 55 per cent in 2024 and 35 per cent in 2025," said Mark Haefele, chief investment officer at UBS Global Wealth Management.

Shares of peer Western Digital climbed 6 per cent. Other chip stocks including Nvidia, Qualcomm, Intel, Broadcom and Marvell Technology firmed between 1.1 per cent and 2.6 per cent. The iShares Semiconductor ETF added 2.4 per cent.