- Lyft co-founders Logan Green and John Zimmer step down from executive roles.
- Lyft names David Risher, former Amazon executive, as new CEO.
- Management reshuffle comes after Lyft concedes it needs to slash fares to stay competitive with Uber.
- Lyft shares up nearly 4% in after-market trading on news of management reshuffle.
Lyft founders step back as ride-hailing company names new chief
Former Amazon executive David Risher will take over as the company tries to make up ground lost to rival Uber
