CUPERTINO, California — Apple Inc. is planning to use its own chips in Mac computers beginning as early as 2020, replacing processors from Intel Corp., according to Bloomberg News.

The initiative, code named Kalamata, is still in the early developmental stages, will likely result in a multi-step transition.

Apple provides Intel with about 5 percent of its annual revenue, according to Bloomberg supply chain analysis.

Intel shares dropped as much as 9.2 percent, the biggest intraday drop in more than two years, on the news. They were down 6.4 percent at $48.75 at 3:30 p.m. in New York.

For Apple, the change would be a defining moment. Intel chips remain some of the only major processor components designed by others inside Apple’s product portfolio. Currently, all iPhones, iPads, Apple Watches, and Apple TVs use main processors designed by Apple and based on technology from Arm Holdings Plc.