Qualcomm had sued the four Apple contractors in May after they stopped paying royalties.
The four suppliers, which assemble iPhones and iPads and are all based in Taiwan, filed a lawsuit on Tuesday night in the US federal court in San Diego, The Wall Street Journal reported.
It said the suppliers challenged Qualcomm's licensing practices with them and branded them as illegal.
In April, Apple said it would stop paying patent royalties to Qualcomm.
Qualcomm retaliated earlier this month by asking the US International Trade Commission to block imports of iPads and iPhones that do not include its chipsets and to prevent sale of such devices that are already in the US.
On Wednesday, Qualcomm said it had filed lawsuits against Apple in Germany claiming that the company violates its patents.
Qualcomm general counsel Don Rosenberg was quoted by the Journal as saying that the counterclaim and Apple’s support of it demonstrated how the iPhone maker has been “pulling the strings” for the contract manufacturers and hindering them from paying the royalties owed Qualcomm under contract.