IShares S&amp;P 100IShares S&amp;P 100 IShares S&P 100 iShares S&P 100 Index Fund is an exchange-traded fund of US stocks. The fund tracks the S&P 100 index. Its ticker is OEF. Holdings. Top ten holdings: 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 (). Those funds are not mega; one fund that is more similar is Guggenheim Russell Top 50 Mega Cap (). IShares S&P 100 iShares S&P 100 Index Fund is an exchange-traded fund of US stocks. The fund tracks the S&P 100 index. Its ticker is OEF. Holdings