The impressive pace of expansion in the ETF industry slowed a bit in May, as issuers introduced fewer new funds than in previous months. Still, more than a dozen new ETFs began trading last month, including some first-to-market products, a few ETFs that will go head-to-head with established products, and the second coming of an [...] Original Post Related Stories: Rydex To Shut Down Leveraged, Inverse ETFs March ETF Roundup: Launches, Filings, and Closures April ETF Roundup: Launches, Filings, and Closures