Exchange-traded funds that hold bonds were posting gains Friday afternoon, as the U.S. stock market as measured by the S&P 500 wobbled. The iShares Core U.S. Aggregate Bond ETF and the Vanguard Total ...

ETFs were introduced to the investing public in 1993 and, in that relatively short time, have become some of the most popular trading and investing vehicles. Today, there are over 3,000 ETFs on the ...