FTSE Russell said Tuesday grocery technology company Ocado Group ($OCDO) and wealth management company St. James's Place ($STJ) will likely be removed from the FTSE 100 index.On-track to replace the companies on the index are cybersecurity company Darktrace ($DARK) and residential developer Vistry Group ($VTY). The companies will move up from the FTSE 250 index.Indicative deletions in FTSE 250 include Ferrexpo ($FXPO), Mobico Group ($MCG), NextEnergy Solar Fund ($NESF) and Octopus Renewables Infrastructure Trust ($ORIT). Potential additions include Ocado, St. James's Place, Alpha Group International ($ALPH), Brunner Investment Trust ($BUT), Liontrust Asset Management ($LIO) and XPS Pensions Group ($XPS).The index provider noted that the companies' deletions from the index will likely result from the review of the FTSE UK index series at close of trading on June 4. It added that the confirmation of the changes will be disclosed after market close on June 5.Price (GBP): £410.40, Change: £+36.60, Percent Change: +9.79%