I would pick SanDisk > Western Digital > SNXX.
SanDisk has the strongest fundamental catalyst. Its FY28–30 model calls for mid-to-high-teens annual revenue growth and ~50% adjusted FCF margins, while multi-year customer agreements are expected to cover roughly two-thirds of FY28 bits. That could make NAND earnings structurally less cyclical than before.
WDC is attractive as a secondary beneficiary, but its HDD exposure makes it a less direct play on SanDisk's NAND thesis.
I would avoid chasing SNXX after +27%. A 2x leveraged product magnifies the upside, but also the inevitable memory-sector corrections. SanDisk itself has already risen more than sixfold this year, so valuation and expectations are substantial.
My choice: SNDK, preferably on a pullback. The Investor Day strengthens the long-term thesis, but it does not eliminate memory cyclicality.
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