Stock Market Glossary

Cost basis

Average purchase price of a securities position, with or without specified costs.

In brief: Average purchase price of a securities position, with or without specified costs.

Meaning in practice

The cost basis helps show the previous gain or loss of a position. It is not a fair value or price target for the future; new decisions should be based on expected return, risk and alternatives.

Context for investors and traders

For traders, this term is most useful when preparing and executing an order. Its meaning depends on the venue, liquidity, time frame and order type. A single reading is not a reliable buy or sell decision.

How to use this in practice

Use the term first to describe the situation and add verifiable data: time frame, benchmark, costs and liquidity. Only then does it become an assessment that can be connected to an investment objective and risk budget.

What to keep in mind

Avoid false precision. Many market terms describe probabilities or historical patterns; they neither guarantee a return nor replace the review of a specific security.

What does Cost basis mean in simple terms?

Average purchase price of a securities position, with or without specified costs.

When is this term relevant to investors?

Assess the term together with price, costs, position size and a predefined loss limit. That turns a market observation into a traceable framework rather than an automatic trading rule.

What should I check before acting on Cost basis?

Avoid false precision. Many market terms describe probabilities or historical patterns; they neither guarantee a return nor replace the review of a specific security.

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