What happens to my shares during a stock split? Do I actually gain anything?

You're right that stock splits don't change the total value of your holdings — at least not mechanically. But they serve important practical purposes.

What happens in a 3-for-1 split:

Market cap, your total value, and all per-share ratios adjust proportionally. No wealth is created or destroyed.

So why split?

1. Accessibility: Lower share price makes the stock accessible to retail investors. Before fractional shares became common, a $3,000 stock price was a barrier for small investors.
2. Liquidity: More shares at a lower price typically increases trading volume and narrows bid-ask spreads.
3. Psychological signal: Splits often signal management confidence — companies split when the stock price has risen substantially.
4. Index requirements: Some price-weighted indices (like the Dow) need manageable per-share prices.

Reverse Splits (e.g., 1-for-10):

The opposite — reduce shares outstanding and increase the price per share.

Reverse splits are often viewed negatively because they're used by companies trying to avoid delisting (exchanges typically require minimum share prices of $1-$5).

Effect on financial ratios:

• P/E ratio: Unchanged (both price and EPS adjust)
• Book value per share: Adjusts proportionally
• Market cap: Unchanged
• Dividend yield: Unchanged (DPS and price adjust equally)

Exam tip: The CFA exam may test whether you understand that splits are cosmetic changes — they don't affect the intrinsic value of the company. Any post-split price movement is driven by market reaction, not the split mechanics.

Learn more about corporate actions in our CFA Level I Equity course.