TLDR
- Marvell Technology (MRVL) and Flex (FLEX) will join the S&P 500 on June 22, triggering immediate buying interest.
- MRVL jumped 7.4% to $283 in premarket trading Monday; FLEX rose 3.9% to $157.88.
- S&P 500 inclusion forces passive index funds to buy the stock, creating automatic demand.
- MRVL is up 210% year-to-date; FLEX has gained 151% in 2026 through Friday’s close.
- Campbell’s (CPB) and Pool Corp (POOL) will be removed from the index to make room.
Marvell Technology (MRVL) rose 7.4% to $283 in premarket trading Monday after S&P Dow Jones Indices confirmed it will join the S&P 500 on June 22. Flex (FLEX) was also added to the announcement, rising 3.9% to $157.88 in early trading.
Marvell Technology, Inc., MRVL
The news came after Friday’s close, when the index provider said both stocks would be added as part of a quarterly rebalancing. Campbell’s (CPB) and Pool Corp (POOL) will be removed to make room.
The timing is a little awkward. Marvell had just slumped 17% on Friday, and Flex fell 4.8%, after Broadcom (AVGO) delivered weaker-than-expected revenue guidance and a stronger-than-expected May jobs report spooked AI-focused investors. Monday’s premarket move helped claw some of that back.
S&P 500 inclusion is a well-known catalyst. Passive index funds that track the benchmark are required to hold its members, meaning they must buy both MRVL and FLEX before June 22. That mechanical buying pressure often lifts prices in the days leading up to the effective date.
A Big Year, Despite the Friday Selloff
Even after Friday’s drop, Marvell stock is up 210% in 2026 through Friday’s close. The AI boom has driven strong demand for Marvell’s chips and networking products, particularly in data centers.
Flex has also had a strong run, up 151% year-to-date. The electronics manufacturer has benefited from the surge in data center construction activity.
Campbell’s slid 0.8% in Monday’s premarket following the removal news. Pool Corp fell 0.3%.
Valuation Questions Remain
The rally has not come without scrutiny. According to GuruFocus, MRVL is trading at $263.47 versus a calculated intrinsic value of $109.07, putting it roughly 141% above that estimate.
The stock’s trailing P/E sits at 85.54x, well above its five-year median of 30.57x. Insider activity over the past three months showed no buying, with insiders selling approximately $32 million worth of stock.
On GF Score, Marvell scores 76/100. Its growth rank is a perfect 10/10 and momentum sits at 9/10. Valuation, however, scores just 1/10.
Futures tracking the S&P 500 were 0.2% higher Monday morning as markets largely brushed off an exchange of fire between Iran and Israel.
Marvell stock was up 7% to $281.88 as of the June 8 session open.
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