So much for a September sell-off. Flows into exchange traded products (ETPs) surged in September to their highest level since December 2008, sending global ETP assets under management to a new high of $1.84 trillion and marking the third-highest inflows ever recorded in a month.

What spurred the rush of activity? A triple play by the world’s central banks. On September 6, the ECB committed to buying short-term European sovereign debt, on September 13 the Fed announced fairly aggressive move to expand its program to purchase mortgage-backed securities and on September 19 the Bank of Japan announced additional stimulus measures.

Economists may wrangle over the effectiveness of monetary easing, but these stimulus measures apparently helped spark a risk-on rally. Investors turned to ETPs with global ETP flows showing a notable uptick in activity after September 6.  Average daily flows after the ECB announcement rose to $2.7 billion, up more than 200% from the daily average of $0.8 billion for July and August.

In total, global ETPs added $43.3 billion in September. Equity funds amassed $34.7 billion of that number, with roughly $23.4 billion flowing into US equity funds alone.

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