After the summer pullback, investors dived back into stock exchange traded funds over October, adding to the best monthly equity market rally in four years.

U.S.-listed stock ETFs attracted more inflows over October than the rest of the year combined, reports Eric Balchunas for Bloomberg.

Equity ETFs saw $10 billion in net inflows over October, compared to $6 billion for the year through September. [ETF Performance Report: October]

Potentially enticing investors back into the stock markets, the Federal Reserve maintained its loose, easy-money policy in September. Meanwhile, the European Central Bank, Bank of Japan and other emerging market central banks are also engaging in full-blown quantitative easing.

International equity ETFs attracted $5 billion in net inflows over October and saw $87 billion in inflows for the year ended September. [What Does The ECB’s Decision Mean For ETFs?]