 Abrdn PLC LSE:ABDN, Hikma Pharmaceuticals PLC LSE:HIK, OTC:HKMPF and Howden Joinery Group LSE:HWDN PLC look likely to drop out of the FTSE 100 next month, to be replaced by FC Investment Trust PLC, Harbour Energy PLC LSE:HBR and ConvaTec Group PLC LSE:CTEC. The FTSE quarterly index review will be decided based on todays Tuesday, 30 August closing share prices, with the changes made so the indices will contain their new constituents at the start of trading on Monday 19 September. 