(Reuters) - U.S. index provider MSCI announced changes to a number of its index funds on Monday, adding 55 securities and removing 34 from its World Index <.MIWD00000PUS>.

The three largest additions measured by full company market capitalization will be Denmark's Dong Energy <DENERG.CO>, the United States' First Data Corporation A and France's Dassault Aviation <AVMD.PA>.

MSCI also announced changes to its emerging markets index <.MSCIEF> and added 44 new securities and deleted 3 from its China A index <.MICNA0000PUS>. The largest Chinese companies added were China Film Corporation A <600977.SS>, China Grand Automotive Services A <600297.SS> and Cultural Investment Holdings A <600715.SS>.

To its emerging markets index, MSCI added China Huarong Asset Management H <0993.HK>, Chinese ADR Weibo Corporation <WB.O>, and Brazil's Electrobras ON.

Updates were also announced to MSCI's frontier markets index, including the three largest: Sonatel (Senegal), Pampa Energia ADR (Argentina) <PAM.BA> and Bank Dhofar (Oman) <BDOF.OM>.

The changes were part of quarterly adjustments MSCI makes to its indexes, which it says are tracked by $9.5 trillion in assets.

The index fund updates will be implemented at market close on Nov. 30.

(Reporting by Dion Rabouin; editing by Diane Craft)