(Bloomberg) — Friday's U.S. stock rout, the worst since Britain voted to leave the European Union, spared few investors, particularly not owners of ETFs designed to minimize turbulence.

Low-beta ETFs plunged even more than the broader market, extending a move that began two days earlier. The PowerShares S&P 500 Low Volatility portfolio slid almost 3% on Friday and the iShares Edge MSCI Min Vol USA ETF fell 2.7%, the worst daily losses in more than a year. Meanwhile, the S&P 500 dropped 2.5%.

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