sentence: holdings top ten holdings : apple inc. ( aapl ) exxon mobil corp. ( xom ) international business machines ( ibm ) at&t inc. ( t ) microsoft corp. ( msft ) general electric co. ( ge ) citigroup inc. ( c ) chevron corp. ( cvx ) johnson & johnson ( jnj ) coca-cola co. ( ko ) pfizer inc. ( pfe ) ( as of june 2012 ) competitors ishares s & p 100 mainly competes with s & p 500 funds , including spdr s & p 500 ( ) , ishares core s & p 500 ( ) , and vanguard s & p 500 etf ( ) .