(Reuters) - Satellite company Inmarsat Plc (>> Inmarsat Plc) will join FTSE 100 equity index, replacing the world's biggest temporary power provider, Aggreko (>> Aggreko plc), FTSE Russell said on Wednesday.

Aggreko will join the FTSE 250 index as part of the change, which will be effective at the start of trading on June 22, the global index provider said.

Aggreko and companies including Provident Financial (>> Provident Financial plc), Croda International (>> Croda International Plc) and Berkeley Group Holdings (>> Berkeley Group Holdings PLC) are now on the reserve list of the FTSE 100 index, and have a chance to replace any outgoing constituent on UK's leading index in the future, FTSE Russell said.

The index provider also listed the following changes.

Aldermore Group (>> Aldermore Group PLC), Auto Trader Group (>> Auto Trader Group PLC), B&M European Value Retail (>> B&M European Value Retail SA) and John Laing Group Plc (>> John Laing Group PLC) will join FTSE 250 equity index, replacing BlackRock World Mining Trust (>> BlackRock World Mining Trust Plc), De La Rue (>> De La Rue plc), Imagination Technologies Group (>> Imagination Technologies Group plc) and Infinis Energy (>> Infinis Energy PLC).

Shawbrook Group (>> Shawbrook Group PLC), Wizz Air Holdings (>> Wizz Air Holdings PLC), Woodford Patient Capital (>> Woodford Patient Capital Trust PLC) and Onesavings Bank (>> OneSavings Bank PLC) will join the FTSE 250, while Law Debenture Corp (>> Law Debenture Corporation plc), Personal Assets Trust (>> Personal Assets Trust PLC), RPS Group (>> RPS Group plc) and Soco International (>> SOCO International plc) will leave the index.

(Reporting by Rishika Sadam in Bengaluru; Editing by Richard Chang)