Underlying Asset
The security, index, commodity or rate whose price determines a derivative's value.
How it is identified
Test: the derivative's settlement value is computed by reference to this asset's price at a defined time
Unit
qualitative
In depth
The underlying's characteristics propagate directly into the derivative: a volatile underlying produces expensive options, an illiquid one produces wide derivative spreads, and a dividend-paying one affects the futures price through the cost of carry. In India the eligible underlyings for equity derivatives are set by SEBI based on liquidity and market capitalisation criteria, and stocks can be removed from the list when they no longer qualify. Index derivatives are cash settled while single-stock derivatives are physically settled, which is a difference in the underlying's treatment with large practical consequences. Trading a derivative without understanding its underlying's liquidity is a route to being unable to exit.
Worked example
A single-stock option on a share trading 30,000 shares a day, with a lot size of 1,000, means one contract is 3.3% of the daily volume of the underlying. Exercising or hedging it moves the stock.
Illustrative figures, chosen so the arithmetic is easy to follow. Not a live price and not a valuation of any company.
Educational reference only
This entry explains what “Underlying Asset” means. It is not investment advice and not a recommendation to buy or sell any security. Any numbers above are illustrative, not live prices, and nothing here predicts price direction or rates a stock. Consider your own circumstances and consult a SEBI-registered investment adviser before acting.