The Rent the Runway cofounder is giving Walmart a new look by heading up a personal shopping service—the first startup incubated inside the retailer.

This is the 21st year we’ve published Fortune’s Most Powerful Women list—and we have a new No. 1 for the first time since 2015. Our 2018 ranking is comprised of seven newcomers, two returnees, and CEOs controlling just under $1 trillion in market cap. Here are the names behind the numbers. Click here to read the International Edition of our Most Powerful Women list.