The share capital can be increased by issuing new shares
The company can, for instance, increase its share capital by circulating additional shares. This means the number of shares is increased, which, in turn, reduces the proportion of the shares held by the previous shareholders.
It means the “old” shareholder’s share becomes “diluted”, and this dilution causes the shares to decrease in value. To avoid it, first-time shareholders are usually granted a subscription right to new shares. This follows a very basic principle: the more shares a person already has, the more subscription rights they receive.
Generally speaking, these subscription rights can, much like shares, also be traded on the stock markets. It is up to a company whether it decides to trade these subscription rights.