Stock splits explained: how they work, why companies do them, and what changes for investors

How a stock split works: mechanics and accounting

In a stock split, the company's board approves a ratio (for example, 2:1, 5:1, or 10:1) and sets a record date. Shareholders on the register on the record date receive additional shares in the specified ratio. Unlike a bonus issue, no reserves are consumed: the paid-up equity capital on the balance sheet remains the same in total, but the face value per share decreases proportionally. A company with 1 crore shares of 10 rupees face value conducting a 2:1 split becomes a company with 2 crore shares of 5 rupees face value - same total paid-up capital of 10 crore rupees.

The share price adjusts on the ex-date: if a stock was trading at 4000 rupees and a 4:1 split occurs, the adjusted price is 1000 rupees per share. Each shareholder holds four times as many shares at one-fourth the price, with no change in total portfolio value. The cost of acquisition for each post-split share is adjusted proportionally from the original purchase price - if you paid 4000 rupees for one share, each of your four post-split shares carries a cost of 1000 rupees.

Why companies split their stock

The primary reason companies split their stock is to improve accessibility and liquidity. Stocks that have appreciated significantly to high absolute prices (several thousand rupees per share) become difficult for small retail investors to buy in meaningful quantities. A 5000-rupee stock requires a minimum investment of 500,000 rupees for a lot of 100 shares; after a 5:1 split, the same 100-share lot costs 100,000 rupees. Broader retail participation typically improves daily trading volumes and reduces the bid-ask spread, benefiting all shareholders through improved price discovery.

Companies often time stock splits during bull markets when their stock price has risen substantially, signalling management confidence and potentially attracting positive attention to the company. However, a stock split itself creates no fundamental value - a company that splits its stock 2:1 does not grow faster, earn more, or hold more assets because of the split. The decision to split should be evaluated as a liquidity management tool, not as an investment signal in isolation.

Stock split versus reverse split

A reverse split (less common in India) consolidates shares: a 1:5 reverse split converts five shares into one share at five times the price. Companies use reverse splits to raise their stock price above minimum exchange thresholds or to reduce the appearance of being a 'penny stock'. In Indian markets, reverse splits are rare and often carry a negative signal - they are associated with companies whose share prices have fallen dramatically and whose management is attempting to restore a respectable price without addressing underlying business problems.

From a tax perspective, the cost of acquisition for split shares is the original purchase price allocated proportionally across the post-split shares. The holding period for each post-split share is calculated from the original acquisition date of the pre-split shares - there is no reset of the holding period at the split date. This means a long-term capital gain on shares held for over one year before a split remains long-term after the split, and the proportionally adjusted cost is used for computing the gain on sale.

FAQ2 reader questions · AEO-eligible

Common questions on what is a stock split.

Keep learning

Adjacent concepts every Indian retail investor should have straight.