(Bloomberg) -- Christian Magoon, a consultant at ISE ETF Ventures and founder and chief executive of YieldShares, discusses the asset growth of the PureFunds ISE Cyber Security ETF (ticker: HACK). It launched in November and by July, HACK had attracted $1.4-billion – one of the fastest ascents in ETF history. (On Aug. 26, after turmoil in the market, it had $1.2 billion.) Bloomberg’s Catherine Cowdery reports on exchange-traded funds.