Market capitalisation — often shortened to "market cap" — is the single most widely used measure of a company's size in the equity markets. It is calculated by multiplying the current share price by the total number of ordinary shares outstanding.
Market cap is a snapshot in time, not a fixed value. It fluctuates continuously during trading hours as the share price changes. A company whose share price doubles while its share count stays the same will also see its market cap double.
Investors and analysts use market cap to compare companies of different sizes, classify stocks into categories such as large-cap, mid-cap, and small-cap, and understand how much weight a stock carries in an index like the ASPI.
At the CSE, market cap determines tile size in the TaprobaneFi heatmap when the map is in "market cap" sizing mode. Companies with the largest market caps occupy the most screen space, giving an immediate visual sense of which firms dominate the exchange by value.