3i could be demoted from the FTSE 100 next week unless there is a shake-up at the foot of the blue chip index in trading today. A reshuffle will be applied next week, based on tonight’s closing price. Investment group 3i is among the favourites to drop out of the coveted top index, with satellite communications firm Inmarsat also at risk, along with broadcaster ITV. Inmarsat boosted its chance of staying up with a solid performance yesterday. Possible risers from the FTSE 250 are investment firm Ashmore and engineer Meggitt.