Dilution of holdings

Owning shares in a company means owning a slice of it. Whenever the company issues new shares, the size of the whole pie grows — and unless a shareholder gets a matching slice of the new shares, their own slice shrinks in proportion, even though the number of shares they hold has not changed.

This shrinking is dilution of holdings. It happens purely because more shares now exist, spreading the same company across more owners.

Indian company law gives existing shareholders a way to avoid it: before a listed company can raise fresh capital through new shares, it must first offer those shares to its existing shareholders. That offer is a rights issue, and it is the direct answer to the dilution problem.

The Companies Act requires a company that wants to raise fresh capital by issuing shares to first offer them to its existing shareholders, precisely to prevent dilution of holdings. A rights issue is made in a fixed ratio approved by the company's board — for example, 1 for 1, or 2 for 5 — and existing shareholders who take up their full entitlement keep their proportionate holding exactly where it was.

A shareholder who does not take up the rights offer, or when new shares are issued to someone outside the existing shareholder base entirely, is the case where dilution actually occurs.

A company has 10 lakh shares of Rs 10 each, giving it issued and paid-up capital of Rs 1 crore. It issues another 10 lakh shares to raise more capital.

If those new shares go to new investors, existing shareholders' proportionate holding is cut exactly in half, since the paid-up capital has doubled to Rs 2 crore while their own share count is unchanged — that is dilution of holdings.

To prevent this, the company instead makes a 1-for-1 rights issue to its existing shareholders. Each investor who already holds 1,000 shares is offered 1,000 more at the rights price. An investor who takes up the full offer still owns exactly the same proportion of the now-larger company; only an investor who lets the rights lapse ends up diluted.

Chapter 6 (Securities Market Segments), section 6.3.1 (Rights Issue), introduces dilution of holdings with this exact 10-lakh-share example before explaining the rights issue mechanism. Expect a question computing the change in proportionate holding after a fresh issue, or one asking why a rights issue is offered to existing shareholders first.

• Dilution is about proportionate ownership, not the number of shares held — an investor's share count can stay the same while their percentage ownership falls.
• Taking up a rights issue in full prevents dilution; letting it lapse does not. The rights issue is an opportunity, not an automatic protection.
• Do not confuse this with a bonus issue, where shares are issued to existing shareholders without any payment from them, in the same proportion as their existing holding — that changes the share count but not the proportionate ownership.