Marvell Stock Is Up 230% In 2026 — S&P 500 Debut Could Make That Look Conservative

Marvell Technology (MRVL) has surged 230% in 2026 and will be added to the S&P 500 effective June 22, which could drive further gains through forced institutional buying. The semiconductor designer benefits from strong AI infrastructure demand. However, recent S&P 500 inclusions show mixed results—while data center infrastructure companies like Comfort Systems USA and EMCOR Group have surged post-inclusion, ad-tech and software names like The Trade Desk have cratered.