When securities are traded in the secondary market who makes or loses money?

In the secondary market, investors buy and sell securities among themselves, and profits or losses are determined by changes in the prices of those securities. If an investor sells a security for more than they paid, they realize a profit, while the buyer may incur a loss if the price declines afterward. Market conditions, investor sentiment, and individual company performance can all influence these outcomes. Ultimately, the gains and losses are redistributed among market participants, depending on the timing of their trades.