High-flying Sandisk $SNDK ( ▼ 2.76% ) hit turbulence Tuesday after short seller Citron Research announced it’s betting against the stock — a bold call after the memory maker’s roughly 1,200% surge since spinning off from Western Digital $WDC just a year ago. Shares dipped as traders digested the warning that the rally may be running ahead of reality.
Citron’s core argument: Sandisk isn’t the next Nvidia $NVDA ( ▲ 3.08% ), it’s a commodity memory business riding a cyclical boom. The firm pointed to industry heavyweights like Samsung and TSMC as looming supply threats, arguing that when production ramps, prices and profits could fall just as quickly as they rose.
The classic memory boom-and-bust playbook
Memory has historically been one of tech’s most brutal cycles. When demand spikes, prices soar. When supply catches up, margins collapse. Citron says Sandisk’s valuation assumes the good times last indefinitely — something history rarely supports.
Still, many analysts aren’t ready to call the top. Forecasts for NAND pricing and earnings have been climbing, not falling, especially as AI infrastructure devours storage alongside compute.
Momentum vs. gravity
Shorting a runaway stock is notoriously dangerous, and Sandisk remains one of the market’s strongest performers, up more than 150% this year alone. As long as shortages persist, bulls argue the cycle still has room to run.
But Citron’s move is a reminder that parabolic trades rarely glide to a gentle landing. In commodity tech, gravity eventually shows up the only question is when.