Exchange-traded funds hit a speed bump last month after coasting through much of the year in the black.

Assets of all exchange-traded funds fell in October by $12.22 billion, or 1%, to $1.269 trillion, according to data from theInvestment Company Institute.

Over the past 12 months, ETF assets increased $213.96 billion, or 20.3%. Assets in domestic equity ETFs increased $118.60 billion since October 2011, and global equity ETFs assets rose $30.73 billion during this period.

At the end of October 2012, assets of bond funds were $238.66 billion, compared to $174,234 last October, and hybrid funds were $593 million, compared to $563 million during the same period.