Micron and SanDisk Shares Rise on Looming Samsung Strike as Philadelphia Semiconductor Rebounds

TradingKey - Samsung Electronics' labor negotiations have officially collapsed after management's refusal to accept terms led to the end of mediation. The union announced the largest general strike in its history from May 21 to June 7 local time, with an estimated 47,000 to 48,000 employees expected to walk out, representing over 64% of its semiconductor division's total workforce.

Impacted by the negotiations, Samsung Electronics' stock price tumbled more than 3% in early trading before eventually finishing up 0.2%, marking the largest labor action in Samsung's history.

Market expectations that disruptions to Samsung's production will exacerbate the global memory chip supply crunch caused capital to flow rapidly toward competitors, sending shares of Micron Technology and SanDisk higher. On May 20, Micron ( MU) rose more than 4% in pre-market trading, while SanDisk ( SNDK) also moved higher, rising more than 2.5% at one point, as the Philadelphia Semiconductor Index broadly recovered in pre-market action.

In the previous session, Micron Technology, which had tumbled 15.2% over three consecutive days, rebounded 2.52%, while SanDisk rose 3.77% in tandem.

As the global leader in memory chips, Samsung Electronics holds approximately 40% and 30% of the global DRAM and NAND flash markets, respectively. Currently, the 2026 capacity of the top three memory manufacturers is essentially sold out, with some customers even beginning negotiations for supply contracts for 2027 and beyond.

TrendForce estimates that this strike could disrupt approximately 3% to 4% of global DRAM supply and about 3% of NAND flash supply. Industry analysts expect that if production lines are fully halted, downstream customers will accelerate order shifts to rivals such as Micron, SK Hynix, and SanDisk.

According to TradingKey analysis, a prolonged strike would further impact global memory supply and drive prices higher again.

Driven by the transmission of investor sentiment and sustained robust demand for AI computing power, the Philadelphia Semiconductor Index (SOX) showed a clear recovery after its largest seven-day decline approached 10%.

On May 19, Citi analysts significantly raised their price target for SanDisk from previous levels to $2,025, maintaining a "Buy" rating. Mizuho simultaneously revised its target for Micron from $740 to $800, reaffirming an "Outperform" rating.

Looking at market performance, significant divergence has emerged within the memory sector. Capital is concentrated on bets involving Micron and SanDisk, which offer exposure to HBM and DRAM price elasticity as well as high visibility in AI servers, while Western Digital and Seagate Technology, in the same industry chain, continued to track lower on Tuesday.

While Samsung's own capacity constraints are at the center of the event, capital going long on the memory cycle seems more inclined to bet on the logic of who will benefit most from a competitor's production halt.