UK's Trustpilot leads midcap gains on upbeat outlook, H1 results
** Shares in Trustpilot Group TRST.L climb 13.9% to 228.4p, top gainer on FTSE midcaps .FTMC index ** Global review platform sees annual adj EBITDA margin ahead of its expectations ** Posts 17% rise in H1 bookings to $140 mln, PBT up 45% to $3.7 mln ** Stock down ~26% so far this year (Reporting by Prerna Bedi in Bengaluru) ((Prerna.Bedi@thomsonreuters.com; +91 98052 24616;))