These charts show the net position of both hedge funds (green shaded) and index funds (blue shaded), both reported in terms of contracts. One contract is about 100 bales. The combined net speculative position has an apparent influence on price (the red line) in the short run. For example, as described here, the hedge fund position build-up in early 2014 is associated with 9 cents of the twelve cent price rally that occurred then. Similarly, hedge fund liquidation and outright selling is associated with 11 of the 24 cent price decline after May 2014.
Note: Not surprisingly, the fluctuations in the hedge fund position correlate very well with the shifts in the pattern of open interest, although sometimes there is a lag. That appears to be the case with the price rally since mid-July 2016 with a large increase in the net long position of hedge funds, and a smaller increase in the net long index fund position.