SanDisk stock surged 10.84% on Tuesday after the company and SK Hynix released the first industry specification for High Bandwidth Flash (HBF) technology. The Open Compute Project (OCP) published the spec this week, marking a push to fill a gap between High Bandwidth Memory (HBM) and solid-state drives.
What High Bandwidth Flash brings
HBF is designed to offer faster speeds than SSDs while providing more capacity than HBM. The spec supports NAND stacking up to 512GB per die stack and defines three performance tiers, with read speeds reaching 3.0 terabytes per second. That puts it squarely in the middle of the memory hierarchy — a spot that's been empty until now.
The timing matters. AI workloads demand both speed and capacity, and current memory options force trade-offs. HBM is fast but expensive and limited in capacity. SSDs hold a lot but can't keep up with data-hungry AI models. HBF aims to be the bridge.
Google and Tenstorrent join the consortium
Google and chip startup Tenstorrent joined the HBF consortium during the standardization process. Their involvement signals that the spec has backing from both hyperscale cloud operators and AI hardware designers. Neither company commented publicly on the announcement, but their participation adds weight to the effort.
SanDisk is set to deliver a keynote on AI memory at the Future of Memory and Storage (FMS) Conference today, just hours before its earnings call. The timing lets the company showcase the HBF news while investors are watching.
Earnings expectations and a recent selloff
SanDisk reports fiscal fourth-quarter results after markets close today. Wall Street expects earnings near $33 per share on revenue around $8.3 billion — a sharp jump from $0.29 per share a year earlier. But the stock has been volatile. Shares fell roughly 47% last month during a broader memory sector selloff, wiping out much of the year's gains.
SK Hynix shares have also swung sharply since their Nasdaq debut in July. The two companies are closely tied through the HBF project, and investors are watching both for signs of sustained demand.
In premarket trading Wednesday, SanDisk shares pulled back slightly as some investors turned cautious ahead of the earnings report. The question now is whether the HBF spec can translate into real revenue — and whether today's earnings will justify the Tuesday rally.
