SanDisk Fortifies Data Lakes with Post-Quantum Encryption as AI Inference Fuels a 400% Rally

SanDisk is threading a needle that few hardware makers have dared to touch: embedding post-quantum cryptography directly into enterprise hard drives while its stock price defies a broader AI selloff. The move targets a specific threat known as “harvest now, decrypt later” — attackers scooping up encrypted data today with the intention of breaking it once quantum computers mature. For hyperscale data-center operators storing petabytes of training and inference data, that risk is becoming boardroom fodder.

The technology debuts in the Ultrastar DC HC6100 UltraSMR series, which is currently undergoing qualification at major cloud customers. SanDisk uses the NIST-standardized ML-DSA-87 algorithm under FIPS 204, paired with RSA-3072 for backward compatibility during the transition. This isn’t marketing-layer cryptography; it’s firmware-level signature verification and key management for the billions of sensitive files that flow through AI data lakes. The timing coincides with a structural shift in the AI industry: after years of GPU-heavy training, the focus is swinging toward inference — the mass delivery of AI models to end users — which demands massive, high-speed enterprise SSDs.

That shift is already showing up in SanDisk’s numbers. In the third fiscal quarter of 2026, revenue hit $5.95 billion, a 251 percent jump from a year earlier. Data-center revenue surged 233 percent sequentially to $1.5 billion, precisely the segment the new security hardware aims to protect. Adjusted earnings per share landed at $23.41, more than double the $12 to $14 range management had previously guided. The company has locked in roughly $11 billion in multi-year purchase commitments from hyperscalers — including Meta and Microsoft — insulating itself from the volatile spot market for NAND chips.

For the fourth fiscal quarter, management expects revenue of around $8 billion, representing 321 percent year-over-year growth. Gross margins, already at 78.4 percent in Q3, are projected to climb to between 79 and 81 percent. Earnings per share are forecast at $3.10 to $3.40, and a quarterly dividend of $0.15 has been set, with the next payout due in June.

Should investors sell immediately? Or is it worth buying SANDISK?

The financial engine is underpinned by a balance sheet that is debt-free and holds roughly $3.74 billion in cash. SanDisk also authorized a $6 billion share buyback program after fully repaying $3.5 billion in credit facilities since its standalone IPO in early 2025.

Yet the stock’s breathtaking ascent has created its own set of risks. SanDisk shares closed Monday at $1,328.32, down 5.63 percent on the day and off 14.17 percent over the past week. That still leaves the stock 44.23 percent higher than a month ago and up 382.60 percent year to date — a run that has pushed the price-to-sales multiple to roughly 16 times trailing twelve-month revenue, compared with 4.5 times at the start of the year. The relative strength index sits at 79.5, and annualized 30-day volatility is near 97 percent.

The stock stands about 10 percent below its all-time high of $1,562. Last week’s 9 percent decline came amid a broader selloff in AI hardware names — GPU designers lost more than three percent and Micron shed over five percent — but SanDisk held its ground on the day. The reason: its sole focus on NAND flash, a market that is currently experiencing a global supply deficit, and the shift to inference-driven demand that plays directly to its product suite.

At these valuations, the stock is acutely sensitive to macro shocks, particularly further disruptions in trade policy around AI infrastructure. The narrative remains intact as long as enterprise SSD demand accelerates and the long-term contracts continue to deliver. A quarterly miss or a renewed trade shock, however, could quickly rewrite the story.