TL;DR A stock split multiplies the number of shares while dividing the price, leaving the total value exactly the same — 1 share at $900 becomes 3 at $300.
The plain-English version
A company announces a 3-for-1 split. Overnight, your 10 shares at $900 become 30 shares at $300. Total before: $9,000. Total after: $9,000. Nothing about the business changed — not profits, not market cap, not your percentage of ownership. The pizza got cut into more slices.
So why bother? Mostly optics and access. A $900 share price feels expensive and locks out small buyers (though fractional shares have mostly solved that). A $300 price feels approachable. Companies also split when the raw number has grown awkward — it's tidying, not value creation.
Does the price pop after a split?
Sometimes, briefly — splits often follow strong runs, and the announcement reads as confidence. But the split itself creates zero value, and studies on post-split performance are mixed at best. Buying because of a split is buying a haircut because the barber smiled.
The reverse split — the one to squint at
A reverse split runs the other way: 10 shares at $0.50 become 1 share at $5. Same total value, but the motive usually differs. Companies typically reverse-split because their price collapsed — often to stay above exchange minimums (like the $1 listing rule) or to look less like a penny stock.
A reverse split isn't automatically doom, but it's frequently a company treating the symptom (embarrassing price) rather than the disease (whatever crushed the price). When you see one, read the story behind it before anything else.
The common mistake
Thinking splits make you richer ("I have 3x the shares now!") or that a low post-split price means the stock is cheap. Value per slice changed; value of your plate didn't. Cheap and low-priced are different words for a reason — market cap is the number that didn't move.
Educational only — not investment advice. Splits change the arithmetic, never the business.