SanDisk Is Up 600%+ in 2026 — And the Smart Money Saw It Coming

SanDisk (SNDK) is the best-performing stock in the S&P 500 this year — up roughly 600–780% through the first half of 2026, and up more than 3,900% since it began trading as a standalone company after spinning off from Western Digital. A move like that looks impossible to catch in hindsight. But the 13F record tells a different story: several of the sharpest investors we track were building SNDK positions in Q1, well before the rally went vertical.

Who bought SNDK before the melt-up

When Q1 2026 13F filings landed in May, SanDisk showed up in some notable portfolios:

Stanley Druckenmiller (Duquesne Family Office) opened a new SNDK position as part of a broader tech re-risking — his tech exposure nearly doubled in Q1 to 18.4% after hitting a multi-year low the quarter before. SNDK sat alongside new stakes in Broadcom, Intel, Cloudflare, and Twilio. Druckenmiller's pattern here is classic: he trimmed tech into strength in 2025, then rotated back in aggressively when the AI trade shifted from GPUs to the infrastructure around them.

Leopold Aschenbrenner (Situational Awareness) paired long positions in SNDK, AMD, TSM, and CoreWeave with short options on some of the most crowded AI names. That long-memory, short-crowded-AI structure was effectively a direct bet on the NAND shortage — the least obvious leg of the AI buildout at the time.

And the buying hasn't stopped. One of the first Q2 filings to hit EDGAR shows Assenagon Asset Management opening a brand-new position worth roughly $1.4 billion as of June 30. Across the most recent reporting period, institutional buyers of SNDK outnumbered sellers by more than two to one.

You can see which other tracked investors hold SNDK — and who added or trimmed — on the InvestorLens flow page, which aggregates position changes across every portfolio we follow.

Why memory became the AI trade

The thesis is simple supply and demand. Every AI server needs enormous amounts of high-speed storage, and the surge in data-center buildouts triggered a global NAND flash shortage that the industry wasn't prepared for. Contract prices for NAND have climbed straight through 2026, and because memory manufacturing carries heavy fixed costs, higher prices fall almost directly to the bottom line.

The numbers are extreme even by semiconductor-cycle standards: analysts expect SanDisk's fiscal 2026 revenue to grow roughly 167% with non-GAAP EPS up over 2,000%, and Wall Street targets have chased the stock higher — Bernstein recently set a $3,000 price target, with Bank of America and Citigroup at $2,500.

This is the same "picks and shovels" migration we've written about before: the smart money moved from GPU designers to everything the GPUs depend on — power, networking, and now memory. Tepper's Micron stake, Bridgewater's chips-over-software tilt, and Druckenmiller's hardware rotation all rhyme with the SNDK trade. On the macro consensus page, AI-infrastructure positioning remains one of the strongest crowd signals in the data.

The caveats

Memory is the most cyclical corner of semiconductors. Every NAND upcycle in history has ended with capacity additions, inventory gluts, and price crashes — and a stock that has already risen 40x from its lows is pricing in a long runway of shortage. A recent wobble triggered by Samsung's earnings was a reminder of how fast sentiment can swing. Investors who bought at $36 and investors buying north of $1,500 are making very different bets.

It's also worth remembering what 13Fs don't show: filings arrive up to 45 days after quarter-end, and fast-moving funds may have trimmed or exited since. Treat Q1 positions as a snapshot of the thesis, not a live signal.

What to watch in Q2 filings

Q2 13Fs are due by August 14, and SNDK will be one of the most-watched names of the season. Three questions matter: Did the early buyers like Druckenmiller hold through the vertical move, or take profits? Did the value-oriented crowd — who typically avoid momentum — start showing up? And does the buyer-to-seller ratio hold above 2:1 now that the easy money has been made?

We'll track all of it as filings land. Use the overlap tool to see which combinations of top investors share SNDK exposure, or browse individual portfolios on the investors page to follow the memory trade fund by fund.

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Data sourced from public SEC 13F filings. Educational research only — not investment advice.