Speaking to Reuters, Cook said that the last quarter, ended September 25, had "larger than expected supply constraints" as well as pandemic-related manufacturing disruptions in South-East Asia. While Apple had seen "significant improvement" by late October in those South-East Asian facilities, the chip shortage has persisted and is now affecting "most of our products," Cook added.

"We're doing everything we can do to get more [chips] and also everything we can do operationally to make sure we're moving just as fast as possible," he said.

Cook said that chips made with older technology remain the key supply constraint. He said that Apple remains unsure whether the shortages will ease after the holiday shopping season.

"Most of what we design are leading-edge (chip manufacturing) nodes, but all of the products have some legacy node components in them as well. And so that (shortage) continues into (fiscal)...