BUZZ-Plus 500 tumbles after 'bad quarter'; UK peers fall

(Updates share movement, adds milestone, peers)

** Shares of online trading platform Plus500 fall 43 pct to a near 2-year low following weak Q1 rev

** PLUSP sinks to the bottom of the Midcap Index

** Peer performace: IG Group Holdings down ~5 pct, CMC Markets 5.2 pct

** IGG and CMCX also among biggest losers on the FTMC

** PLUSP's Q1 rev plunges to less than a fifth of Q1 2018

** Due to low volatility, PLUSP suffered from a fall in trading volumes

** Number of active customers down to 97,921 from 218,187

** "Really bad quarter," says Liberum

** Liberum still expects new customer numbers to improve through the year as competition weakens

** Plus shares down ~66 pct YTD after bumper year in 2018 (Reporting by Karina Dsouza in Bengaluru)