Marvell and Flex Confirmed to Join S&P 500 on June 22
N.R. Finch
S&P Dow Jones Indices confirmed that Marvell and Flex will enter the S&P 500 on June 22, sending their after-hours shares up 6% and 3.9% respectively; separately, S&P refused to shorten its 12-month seasoning rule for new listings, blocking SpaceX and peers from fast-tracking into the index.
Who's in, who's out, and why these two?
Marvell Technology (MRVL) and Flex (FLEX) will join the S&P 500 before the open on June 22, replacing Pool Corp (POOL) and Campbell's (CPB).
Candidates must meet a minimum market cap of $22.7 billion plus profitability, liquidity, and public-float thresholds. This means → size alone doesn't get you in; the company must also prove it earns money and trades actively enough.
After the announcement, Marvell rose 6% and Flex 3.9% in after-hours trading — the market is front-running the forced buying that passive funds will soon deliver.
What makes their fundamentals stand out?
Marvell posted above-consensus quarterly guidance in its latest earnings and raised its full-year outlook. In plain terms = AI data centers need more custom chips, and Marvell sits right in the middle of that demand wave.
Flex issued fiscal-year 2027 profit guidance that also beat the Street, and announced plans to spin off its cloud and power-infrastructure unit.
This reflects that both companies earned their spots not just on market cap but on strengthening fundamentals at the same time.
What does S&P 500 inclusion actually do to a stock?
Joining the S&P 500 means every passive fund tracking the index — ETFs and index funds — must buy these two stocks. This means → regardless of what any fund manager thinks, the inflow is mechanical and certain.
In plain terms = it's like a shop being added to a "must-visit list" — everyone who shops by the list has to walk in and spend, no matter the prices inside.
The after-hours moves show the market is already pricing in that guaranteed capital. More front-running may follow in the trading sessions before the effective date.
Why did S&P refuse to open the door for SpaceX?
S&P Dow Jones Indices stated it will not shorten the 12-month seasoning period for newly listed companies, nor waive profitability or float requirements based on size alone.
This runs directly counter to Nasdaq and FTSE Russell, which recently loosened their rules to let large new listings enter faster. This means → S&P chose rule independence over competing for first-mover bragging rights.
Bloomberg Intelligence estimates that if the rule were relaxed, SpaceX's IPO would trigger roughly $14 billion in forced passive buying, OpenAI about $8 billion, and Anthropic about $4.6 billion. S&P's stance pushes that massive capital window back by at least a year.
Content is for reference only, not financial advice.