Nasdaq 100 rises 2% as Marvell, SanDisk, Datadog and Western Digital rally

The leadership here is telling: storage and data-infrastructure names like SanDisk, Western Digital and Marvell are doing the heaviest lifting, with a storage-chip index hitting a fresh intraday high while the broader S&P 500 trails well behind. That concentration suggests the move is a sector-specific repricing rather than a broad risk-on wave, which makes the durability of the storage bid the key question. Whether this narrow leadership broadens out or fades as a single-session rotation is what's worth watching.