Shares of Marvell Technology's Argentine CEDEAR (MRVLD.BA) surged to $22.60, up 9% from Friday's close of $20.74, after the AI chipmaker's confirmed entry into the S&P 500 effective June 22 triggered a wave of event-driven buying — and a partial intraday reversal that hints the easy gains may already be priced in.
• Trillions in Passive Money Must Now Buy the Stock, Ready or Not
When a company joins the S&P 500, the index funds and ETFs that track the benchmark must hold it in proportion to its index weight — and those funds collectively manage trillions of dollars, forcing a wave of buying regardless of what managers think of the valuation.
The three largest vehicles alone — Vanguard's VOO, BlackRock's IVV, and State Street's SPY — held nearly $2.7 trillion combined as of early June 2026. That mechanical demand explains the pop. But history shows much of the "index effect" gain often arrives before the addition date, and Marvell's AI-premium valuation carries its own risk. The intraday reversal suggests some traders are already selling into the forced buying.
• A 210% Rally and a Triple-Digit P/E Leave No Room for Error
Marvell was up 210% year-to-date as of its first post-announcement session.
The trailing price-to-earnings ratio stands at roughly 99x, significantly higher than its five-year median of about 31x. For CEDEAR holders in Buenos Aires, who hold fractional receipts priced in pesos but exposed to dollar-denominated U.S. equity risk, that valuation stretch matters: any disappointment in AI-chip demand could hit the underlying stock hard and amplify losses through both price and exchange-rate moves.
• Nvidia's Billion-Dollar Endorsement Is Real, but So Is the Insider Selling
Marvell's rally was fueled in part by Nvidia CEO Jensen Huang calling it "the next trillion-dollar company."
Nvidia backed that rhetoric with cash: a $2 billion equity investment in Marvell's convertible preferred stock closed in March 2026. Yet company insiders have collectively sold $137 million more than they bought over the past 12 months.
Meanwhile, Marvell's CFO resigned effective June 15 — an unusual departure days before a milestone event.
• The Fundamental Case Depends on AI Revenue That Hasn't Fully Arrived
Marvell is a major player in custom AI chips behind leader Broadcom, supplying technology for Amazon's and Microsoft's in-house AI processors.
The company reportedly targets $15 billion in revenue by fiscal 2028 , roughly triple recent levels. If that growth materializes, the valuation stretches less. If it doesn't, the S&P 500 badge alone won't protect a stock trading at 100 times earnings.