SEC Chairman Gary Gensler. Evan Vucci/Associated Press The SEC will review a host of rules related to the equity market structure, Gary Gensler said. That includes the compensation Wall Street brokers receive for executing stock trades. Shares in high-speed trader Virtu Financial fell 7.7% after the SEC chairman's speech. Sign up here for our daily newsletter, 10 Things Before the Opening Bell. The Securities and Exchange Commission is looking at changing rules around share trading after the day-trader frenzy around meme stocks showed equity markets may not be as efficient as they could. Chairman Gary Gensler said Wednesday he has