** Shares of online travel agency Tripadvisor TRIP.O rise 1.8% premarket at $12.9 after Q1 revenue and profit beat analyst estimates

** Posts Q1 revenue of $398 mln vs Wall Street expectations of $387.1 mln - data compiled by LSEG

** Q1 rev increases 1% YoY with double-digit growth in its Viator and TheFork segments, though Brand Tripadvisor - the biggest segment in terms of revenue - falls 8%

** Adj. profit of 14 cents/share also tops estimates of 4 cents

** Four of 18 analysts rate "buy" or higher, nine "hold" and five "sell" or lower; median PT is $17

** As of last close, TRIP down 13.6% YTD vs peers Expedia's EXPE.O fall of 11.6%, Booking Holdings' BKNG.O rise of 3.9%

(Reporting by Twesha Dikshit)

((Twesha.Dikshit@thomsonreuters.com))