** Shares of Lyft LYFT.O rise 6.2% to $13.80 premarket

** Lyft hikes stock buyback plan to $750 mln from $500 mln and beats Q1 adjusted EPS estimates, despite slight revenue miss

** Sees Q2 gross bookings of $4.4-$4.6 bln vs est of $4.5 bln

** "We think concerns over pricing competition have subsided and Lyft builds momentum, particularly in under-penetrated U.S. cities while sowing seeds for international growth," says Roth Capital Partners

** Still Roth keeps "neutral" rating saying, "We'd like to see consistent execution along with stable pricing"

** Overall, analysts' avg rating is also "hold" and median PT is $15.12 -LSEG data

** Analysts avg rating on Uber UBER.N is "buy"

** YTD, Uber has gained ~36%, while Lyft is up just ~1%

(Reporting by Akash Sriram in Bengaluru)

((Akash.Sriram@thomsonreuters.com; https://twitter.com/hoodieonveshti;))