** Office rental company International Workplace Group IWG.L slips 10% to 208p; top pct loser on FTSE mid-cap 250 index .FTMC
** Stock set for biggest one-day pct drop since March 2020
** Regus owner forecasts FY earnings at lower end of its forecasts due to further investment in managed, franchise segment growth
** H1 group revenue falls more than 1% y/y
** As of last close, IWG up more than 44% this year vs FTMC's 5.5% gain
(Reporting by Atharva Singh in Bengaluru)
((Atharva.singh@thomsonreuters.com))