What Is Wash Trading? Wash trading occurs when an investor buys and sells the same or a similar security investment at the same time. The Internal Revenue Service (IRS) also refers to this as a wash sale, since buying the same security cancels out the sale of that security. It’s also called round-trip trading, since you’re essentially ending where you began — with shares of the same security in your portfolio.
Wash trades can be used as a form of market manipulation. Investors can buy and sell the same securities in an attempt to influence pricing or trading activity. The goal may be to spur buying activity to send prices up or encourage selling to drive prices down.
Investors and brokers might work together to influence trading volume, usually for the financial benefit of both sides. The broker, for example, may benefit from collecting commissions from other investors who want to purchase a stock being targeted for wash trading. The investor, on the other hand, may realize gains from the sale of securities through price manipulation.
Wash trading can be a subset of insider trading, which requires the parties involved to have some special knowledge about a security that the general public doesn’t. If an investor or broker possesses insider knowledge they can use it to complete wash trades.