Both companies have paid tribute to the entrepreneur.
Gokada described Saleh as "a great leader, inspiration and positive light for all of us" in its tweet.
Hussein M Elius, who co-founded Pathao with Saleh, told Bangladesh's Daily Star newspaper: "Fahim believed in the potential for technology to transform lives in Bangladesh and beyond.
"He saw the promise in us when all we had was a common purpose and a shared vision. He was, and will forever remain, an incredible inspiration for Pathao and our entire ecosystem."
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