Marvell Technology Inc. (NASDAQ:MRVL) will be added to the S&P 500 index effective before the market opens on June 22 — the Q2 quarterly rebalance — alongside contract manufacturer Flex Ltd. (FLEX).
The two companies replace Campbell’s Co. (NASDAQ:CPB) and Pool Corp. (NASDAQ:POOL), both of which slide down to the S&P SmallCap 600.
- MRVL stock is climbing again. Watch the price action here.
Marvell shares are trading 9% higher Monday morning. The move came after a bruising session on Friday when the stock fell nearly 17% — but zoomed out, the numbers still tell a remarkable story.
MRVL is up approximately 230% in 2026 alone, a run that few mega-cap names can match.
MRVL In The S&P 500
Marvell’s case for inclusion is hard to argue with. The California-based semiconductor designer has become one of the defining names in AI infrastructure, supplying custom silicon and networking chips to the hyperscalers building out data center capacity at a pace the industry has never seen.
At the time of the index announcement, Marvell’s market capitalization sat at roughly $230 billion, according to Benzinga Pro data.
Nvidia Corp. (NASDAQ:NVDA) holds a stake in the company, and Nvidia CEO Jensen Huang last week endorsed Marvell as a potential $1 trillion market cap candidate.
The mechanics of S&P 500 inclusion create a built-in tailwind that is largely independent of fundamentals.
Every passive fund, ETF and institutional portfolio benchmarked to the S&P 500 must hold MRVL in proportion to its weight. That means billions of dollars in programmatic buying concentrated around the June 22 effective date.
For a stock already up 300% on the year, forced buying adds fuel to a fire that’s already burning.
Recent S&P 500 Inclusions
Recent history offers a template for how S&P inclusion can affect stocks in adjacent sectors.
- Comfort Systems USA (NYSE:FIX), an HVAC and electrical contractor serving AI data centers, has surged 91.3% since its own S&P 500 addition on Dec. 22, 2025.
- EMCOR Group (NYSE:EME), another electrical and mechanical contractor with heavy data center exposure, is up 76.4% since joining in September 2025.
- Vertiv Holdings (NYSE:VRT), which supplies power infrastructure to data centers, has gained nearly 20% since its March 2026 inclusion.
The common thread is obvious: companies tied to the physical and electrical backbone of the AI buildout have rewarded S&P 500 inclusion handsomely.
The cautionary side of the ledger is equally instructive. The Trade Desk Inc. (NASDAQ:TTD) has cratered 75.1% since joining the index in July 2025, the worst-performing recent addition by a wide margin.
Workday Inc. (NASDAQ:WDAY) is down 47.2% since its December 2024 inclusion, and Coinbase Global (NASDAQ:COIN) has fallen 42.1% since May 2025.
Index inclusion guarantees buying — it does not guarantee performance.
However, those cautionary tales are software and ad-tech names whose underlying businesses ran into headwinds.
Marvell is positioned in custom AI silicon and high-speed networking, two markets where demand remains extraordinarily strong as hyperscalers race to scale capacity.
As the AI infrastructure wave continues to lift every company in its supply chain, Marvell’s S&P 500 seat is a validation — and it could be a starting gun.
MRVL Stock Price Activity: Marvell stock was up 8.57% at $286.04 at the time of publication Monday, according to Benzinga Pro.
Over the past month, MRVL has gained about 74.8% versus a 0.1% rise in the S&P 500 and is up roughly 230% year-to-date compared to the index’s 7.6% gain.
Photo: Piotr Swat / Shutterstock