BlackRock and Vanguard bring home the bacon, again

iShare's Core S&P 500 fund holds the second largest piece of the market with 9.3% of the total market, followed by Vanguard's Developed Market Index fund with 7.3%. iShare's Core S&P 500 product had net inflows of $13.2 billion in 2016, and iShare's saw significant inflows into its EAFE, midcap equity and high-yield products. Nearly a quarter of Vanguard's ETF flows went into its S&P 500 and developed markets funds.