Marvell Technology jumped 10% because S&P Global announced it would join the S&P 500 index on June 22. The company makes AI chips. The stock went up because people heard the news and bought the stock. That's the whole story.
Index inclusion means passive funds will buy your shares on a specific date. They must buy them. They have no choice. This is not a secret. Everyone knows the date. Everyone knows the approximate volume. The information contains zero edge.
The company didn't announce a new product. Revenue didn't double overnight. They didn't cure cancer or invent a chip that makes your phone stop listening to you. S&P Global simply moved Marvell from one list to another list.
Traders celebrated this alphabetical reorganization by panic-buying shares at a 10% premium. They paid more money for the exact same company doing the exact same thing it was doing the day before. The only difference is which spreadsheet contains the ticker symbol.
The best part is pretending this validates anything about Marvell's business. The S&P 500 criteria are market cap and profitability over four quarters. It's a size contest with a pulse check. Congratulations to Marvell for being large and not dead.
June 22 will arrive. The index funds will execute their forced purchases. The mechanical buying pressure will disappear. Then everyone gets to find out what the stock is worth when people have a choice about owning it.
But sure, chase that 10% pop on list-making day. I'm confident your technical edge of "reading S&P Global press releases" will compound beautifully over time.
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