NEW YORK, Aug 7 (Reuters) - MSCI ( MSCI ) said on Thursday it

will add 42 securities and delete 56 from its widely followed

ACWI equity index.

The three largest companies by market cap to be added to the

developed markets index are Rocket Lab Corp,

Sofi Technologies ( SOFI ) and Affirm Holdings ( AFRM ), all

headquartered in the United States.

The three largest companies to be added to the emerging markets

index are China Citic Bank, Dian Swastatika Sentosa

and Laopu Gold.

All changes will be made as of the close of August 26, MSCI ( MSCI )

said.