The memory trade gives back: 20% to 40% off the peak tests the pricing-power story

Four memory and storage stocks that sit among the S&P 500's ten best performers this year have handed back a large slice of the move, trading roughly 20% to 40% below their late-June peaks after a sharp reversal in recent weeks ^[1][6]. That matters because the run rested on a single claim, that AI demand has pulled memory out of its commodity pricing cycle, and the drawdown is the first serious test of it ^[5][15].

The scale first. Since the start of 2025, Micron is up roughly 920%, Western Digital 820% and Seagate nearly 740%, against 25% for the S&P 500 ^[3]. Micron's gain is about 37 times the index's over the same stretch ^[1]. Sandisk, which began trading independently in February 2025, is up more than 4,300% ^[4]. Year to date the same names are up roughly 575% (Sandisk), 240% (Micron), 210% (Seagate) and more than 170% (Western Digital) ^[2].

Put those two sets of numbers together and the picture changes. Micron's 920% since the start of 2025 and 240% so far this year imply about 200% in 2025 alone, meaning more of the compounding happened in 2026 than in the year before it ^[2]. Western Digital works out to roughly 240% in 2025 ^[3]. Sandisk's move from its February 2025 debut through the end of that year comes to about 550% ^[4]. This is not a slow re-rating. The steepest part of the move is the most recent part, which is also the part now unwinding, and CNBC dated the peaks to late June with the reversal in the weeks before its August 21 piece ^[6][7].

The mechanism was straightforward: hyperscalers accelerated AI data centre spending, supply could not keep pace, and the resulting shortages handed producers pricing power that carried through to earnings and then to the stocks ^[5]. Nothing in that chain is permanent by construction. The bull case is that the demand is structural across the whole stack rather than concentrated in one product. D.A. Davidson's Gil Luria told CNBC that DRAM, NAND and hard drives are not substitutes and that data centres "need all of them," because "they do different things" ^[9]. Micron chief executive Sanjay Mehrotra made the same point, describing a hierarchy running from high-bandwidth memory through DRAM to SSDs ^[10], and argued that "the value of memory, that equation has totally changed" ^[13]. Luria went further, saying memory is "the guts of the model now" rather than a periphery ^[14].

The counterweight sits in the same reporting. Memory has historically been treated as a commodity, with Micron, SK Hynix and Samsung competing largely on price, which produced the brutal boom-and-bust cycles the industry is known for ^[15]. Three suppliers competing on price is what the structure was before AI, and the structure has not changed; the demand has.

The differentiation is worth holding onto. DRAM, the fastest and most expensive tier, is Micron's core and the substrate that gets stacked into high-bandwidth memory, which Luria calls more important to the data centre than CPUs ^[8][12]. NAND is Sandisk's sole focus and part of Micron's mix; hard drives from Seagate and Western Digital are the cheapest way to hold bulk data ^[8]. Those are different cost curves and different competitive sets, and they have been trading as one basket.

Recovering the highs is arithmetic, not narrative: a name 40% off its peak needs a 67% gain to get back, and one 20% off needs 25% ^[5].