Stock split

Dividing each share into several, which lowers the price per share but not the value of what you own.

In a 2-for-1 split, 10 shares at $300 become 20 shares at $150 — still $3,000. The company and its market cap are unchanged.

A reverse split does the opposite: in a 1-for-10 reverse split, every 10 shares become one, at ten times the price. Charts usually adjust past prices for splits.