Commercials are structurally on the other side of the speculative crowd. When funds are heavily long, commercials are heavily short, because they are selling forward production into the speculative bid. That does not make them right, but it makes their positioning a useful contrarian gauge.
They also have information nobody else has: a grain merchant knows what is moving through its elevators weeks before the government reports it. Commercial positioning is therefore sometimes read as informed flow rather than mere hedging.
Example: in a market where prices have risen 30%, commercials holding a net short of 420,000 contracts against a normal 250,000 indicates producers are aggressively locking in high prices, a common feature near cyclical tops.
Related: commitments-of-traders, disaggregated-cot, hedger, hedge-exemption, non-commercial-trader