Why a Stock's Price Falls After a Bonus Share — and Why 'Free Shares' Are Not Really Free

Few corporate announcements excite retail investors in Nepal as much as a bonus share. Yet on the very day those bonus shares land in the account, an investor's wealth has not grown by a single rupee — and the stock's price has fallen. Understanding why reveals one of the most misunderstood mechanics of the share market: a bonus rearranges value, it does not create it.

A bonus share is the process by which a company hands its shareholders additional shares free of charge, out of its profits. The number of shares an investor holds goes up — but the total value of their holding stays the same. That single sentence contains the whole puzzle, and its resolution.

The reason the price must adjust is arithmetic. A bonus issue brings no new money or new value into the company; it merely increases the number of shares outstanding. If the old price were left untouched, the company's total market value — its market capitalization — would suddenly appear to balloon, even though nothing about the underlying business had changed. To keep market capitalization honest and reflect the real value, the per-share price is reduced in proportion. The adjustment factor is simply one divided by one plus the bonus ratio.

A worked example makes it concrete. Suppose a stock trades at Rs 100 and an investor holds 1,000 shares — a holding worth Rs 100,000. The company declares a 50 percent bonus. The investor's shares rise from 1,000 to 1,500, but the price is divided by 1.5, falling to Rs 66.67. Multiply Rs 66.67 by 1,500 shares and the holding is worth roughly Rs 100,000 once again — exactly where it started. The same logic scales: a 100 percent bonus halves the price, a 10 percent bonus divides it by 1.1.

What actually changes is found not in the investor's wealth but on the company's balance sheet. A bonus issue capitalizes reserves — it shifts money from accumulated profits and reserves into paid-up capital. The company's net worth does not change; only its composition does. There is a quieter consequence too: with profit now spread over a larger number of shares, earnings per share are diluted in the same proportion. The stock is therefore not genuinely "cheaper" — it is the same pie cut into more slices, with each slice representing a thinner sliver of earnings.

Why, then, do companies bother? In Nepal the answer is often regulatory: banks, insurers and other financial institutions face minimum paid-up capital requirements, and bonus shares are the standard tool for capitalizing reserves to meet them — which is exactly why bonus issues are so common in the country's financial sector. Beyond that, a lower price improves a stock's liquidity and affordability, drawing in more buyers; issuing bonus rewards shareholders without draining the company's cash; and a willingness to expand the capital base is read by many as a signal of confidence.

For the ordinary investor, this is where a trap is laid. Many chase a bonus announcement believing free shares mean free wealth, bidding the price up before the book-closure date — only to be baffled when the price drops on the ex-bonus day. That drop is not a loss; it is the automatic adjustment. The real gain materializes only if the post-adjustment price subsequently climbs — if the stock, in market parlance, "fills the gap." Sentiment-driven run-ups ahead of a bonus often unwind just as quickly afterward.

It is also worth distinguishing a bonus from a cash dividend. A cash dividend takes money out of the company and puts it in the shareholder's pocket — a genuine transfer of value. A bonus keeps the money inside the company, merely re-labeling reserves as capital. And the comforting line that "total value stays the same" is, strictly, a pre-tax and pre-market-movement statement: under prevailing law, bonus shares attract tax, and once trading resumes the price moves on supply and demand like any other day.

The bottom line is liberating in its simplicity. A bonus share increases the share count, lowers the per-share price and leaves total value unchanged. Lasting wealth in the market comes from a company's earnings actually growing — not from slicing the same pie into thinner pieces. The wise investor reads the arithmetic before chasing the announcement.

(This explainer is for general information; investors should do their own research before making any investment decision.)