Mary Schapiro

Under the Dodd-Frank law, the SEC got the lion's share of the rules to write, more than 100 rules, and we have done an extraordinary amount of that. Eighty percent have been either proposed or adopted. So, a lot, a lot accomplished but of course, more to do.

I came in with the intention of serving as long as it made sense for me to do so. The election was a natural moment to think about whether I wanted to stay longer, and I'm thrilled to turn the reins over to my longtime colleague Elisse Walter.

Working on 'Austin and Ally' has been an absolute dream! We literally have fun every single day! Whether it's scaring each other or singing together or just hanging out in each other's dressing rooms, the cast and I are super close! I feel really lucky to be with everyone on our set!

The lower spreads mean lower costs for investors, because Nasdaq investors generally do not trade directly with one another. Instead, they usually buy and sell from market-makers, brokerage firms that flip shares between buyers and sellers and keep the spread for themselves.