Which of the following is NOT a behavior typically associated with money laundering in securities transactions?

Using proceeds from sales for legitimate purchases is not typically associated with money laundering in securities transactions because this behavior indicates that funds are being used in a straightforward and lawful manner. Money laundering entails concealing the origins of unlawfully obtained money, and a key focus is on disguising illicit funds through complex transactions.

In contrast, behaviors such as frequent small deposits, layering transactions between various securities, and rapid buying and selling of stocks are characteristic of laundering practices. Frequent small deposits can help avoid detection by keeping amounts below reporting thresholds. Layering refers to the process of creating a complex series of transactions to obfuscate the origin of the funds, making it harder for authorities to trace their source. Rapid trading of stocks, also known as "churning," can be used to mask the flow of money and create an impression of legitimate trading activity.

The correct answer reflects a clear distinction between legitimate financial behavior and the tactics typically employed for money laundering.