Trading data
Trading volume and liquidity
A factual guide to trading volume, liquidity, spreads, and what market activity can and cannot show.
What volume measures
Trading volume measures how many shares trade during a period. It can be shown daily, intraday, or across other time windows depending on the data source.
Volume describes activity, not the reason for that activity. News, index rebalancing, earnings, liquidity needs, and broad market conditions can all affect trading.
What liquidity means
Liquidity describes how readily a security can trade without large price impact. Common clues include volume, bid-ask spreads, depth, and consistency across time.
Aerarium Research trading pages present market data as factual context alongside company filings and financials.
What not to infer
High volume does not automatically reveal informed trading, and low volume does not by itself prove a company is weak.
Trading data is market context. It should not be read as personalized advice or as a complete explanation of company fundamentals.
Common questions
Does volume show whether buyers or sellers were right?
No. Volume shows trading activity, not whether either side had better information or a better outcome.
What is a bid-ask spread?
It is the difference between quoted prices to sell and purchase a security at a moment in time, and it is one signal of liquidity.
Can liquidity change quickly?
Yes. Liquidity can change around news, earnings, market stress, or changes in market participation.