The Globe and Mail reports in its Thursday edition that the top U.S. securities regulator on Wednesday unveiled potential rule changes to transform how Wall Street handles retail stock trades after the meme-stock mania last year raised questions about whether mom-and-pop investors were getting the best price. A Reuters dispatch to The Globe says that the rules, spelled out by Securities and Exchange Commission chairman Gary Gensler, would require trading firms to directly compete to execute trades from retail investors to boost competition. The Wall Street watchdog plans to scrutinize the controversial payment-for-order-flow (PFOF) practice, in which some brokers, such as TD Ameritrade, Robinhood Markets and E*Trade, are paid by wholesale market makers for orders. Mr. Gensler said the new SEC rules would mandate market-makers disclose more data around the fees these firms earn and the timing of trades for the benefit of investors. PFOF came under regulatory scrutiny last year when an army of retail investors went on a buying spree of meme stocks such as GameStop and AMC Entertainment, squeezing hedge funds that had shorted the shares. Many investors purchased shares using commission-free brokers such as Robinhood.