Goldman Sachs has reported that the world’s five largest hedge funds have increased their U.S. stock market leverage and trading holdings since 2014.

These multi-manager funds hold over a third of the hedge fund industry’s U.S. shares, despite their 9% share of the industry’s assets under management.

The largest hedge funds own 1% of the U.S. stock market, with assets growing 21% in the last year compared to 9% for the rest of the industry.