SanDisk shares fall over 5% premarket, now at $666.19; acquires 139 million shares of Nanya Technology.

SanDisk Corporation (SNDK) shares declined over 5% in premarket trading on March 25, 2026, dropping to $666.19 following a significant strategic announcement and broader sector headwinds. The pullback occurs despite the company reporting robust fourth-quarter revenue of $3.025 billion, a 61% year-over-year increase driven by surging demand in the datacenter segment. The stock has previously rallied 208% year-to-date, prompting profit-taking as investors reassess valuations after a 1,200% gain over the past year.

The immediate catalyst for the decline includes competitive concerns regarding memory supply. Micron Technology recently signaled aggressive capital expenditure plans, raising fears of future oversupply in the NAND flash market, which has dampened sentiment across the sector. Additionally, SanDisk's stock price now trades above the average analyst price target of $761, suggesting the market has priced in significant optimism that may require strong execution to sustain.

Concurrently, SanDisk announced a major strategic move to secure its supply chain. The company agreed to invest $1.0 billion in a private placement of Nanya Technology Corporation, acquiring approximately 139 million shares, or 3.9% of Nanya's fully diluted equity. This transaction, executed at a 15% discount to Nanya's 30-day average price, includes a three-year statutory lock-up period and a multi-year strategic supply agreement for DRAM products. While the investment aims to support long-term sourcing strategies amid the AI-driven memory shortage, the market appears to be weighing the immediate capital outlay and competitive dynamics against the company's recent operational leverage and guidance for the upcoming quarter.