Marvell Technology is set to join the S&P 500, driven by its AI-fueled revenue surge of 42% YoY to $8.2B. Index inclusion forces passive fund buying, but the stock has likely already moved — the setup is whether the 'buy the rumor, sell the news' dynamic kicks in post-inclusion.
MRVL's 42% YoY revenue growth and 51% gross margin expansion signal durable AI infrastructure demand — if index fund demand is larger than estimated or earnings revisions accelerate simultaneously, the stock could hold and extend gains through inclusion.
Stocks added to the S&P 500 historically fade 2-5% in the two weeks after the effective inclusion date as arbitrageur supply hits the market, and MRVL's pre-announcement run likely priced in most of the passive buying demand already.