Stock Split

A stock split is a decision by a company's board to divide each existing share into several shares. In a two-for-one split, a shareholder who owned 100 shares owns 200 afterward, and the market price per share roughly halves. The company receives no money, its assets and liabilities do not change, and each shareholder's proportion of ownership and total investment value stay the same. Only the number of units, and the price per unit, changes.

Companies usually split their stock when the share price has risen to a level that some investors find inconveniently high, aiming to make shares more accessible and to improve trading liquidity. Well-known examples include Apple's four-for-one split in 2020 and Nvidia's ten-for-one split in 2024. A reverse stock split does the opposite: it combines shares, for example one new share for every ten old ones, raising the price per share.

A stock split requires no journal entry that changes account balances. The total amount in common stock, paid-in capital and retained earnings stays the same. Instead, the par value per share is reduced in proportion to the split, and the number of shares authorized, issued and outstanding increases. Companies typically record a memorandum entry noting the new share count and par value. For shares with no par value, only the share count changes.

This distinguishes a split from a stock dividend, which moves an amount from retained earnings to contributed capital. Under US GAAP, some companies effect a split in the form of a large stock dividend, for legal reasons, and then record a transfer at par, but the economic effect is the same. Total stockholders' equity is unchanged in every case.

A company has 2,000,000 shares of $2 par common stock outstanding, trading at $450 per share, giving a market capitalization of $900 million. The common stock account shows $4,000,000. Net income for the year is $60 million.

The board approves a three-for-one split. Afterward there are 6,000,000 shares with a par value of about $0.67 each, and the common stock account is still $4,000,000. In theory the share price falls to $150, and market capitalization remains $900 million. A shareholder who held 300 shares worth $135,000 now holds 900 shares worth $135,000.

Earnings per share fall from $30 to $10, and book value per share falls by the same factor. Accounting rules require EPS and share counts for all prior periods to be restated retroactively, so historical comparisons are not distorted. Per-share terms of employee stock options are adjusted too: an option to buy 3,000 shares at $300 becomes an option to buy 9,000 shares at $100.

• Affordability: a lower price makes it easier for small investors to buy whole shares, although fractional share trading has reduced this concern.
• Liquidity: more shares at a lower price can narrow bid-ask spreads and increase trading volume.
• Signaling: a split is often read as a sign of management confidence, since companies rarely split after falling prices.
• Index considerations: in price-weighted indexes such as the Dow Jones Industrial Average, a very high share price can affect a company's weighting.
• Reverse splits: companies whose shares trade at very low prices may combine shares to meet exchange rules, such as the minimum bid price of $1 required for continued listing on the Nasdaq, or to avoid the stigma of a penny stock.

A split does not create value. Any price rise around a split announcement generally reflects the market's view of the company's prospects rather than the split itself. For US federal income tax, a split is normally not a taxable event: the shareholder's total cost basis is simply spread over the larger number of shares, so the basis per share falls by the split ratio. Cash paid for fractional shares in a reverse split may be taxable. Investors should check that their brokerage records reflect the new share count and adjusted basis, and that any limit or stop orders placed before the split have been adjusted or cancelled according to the broker's and the stock exchange's rules.