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Tim Cook’s secret weapon that turned Apple into a $4 trillion empire
Tim Cook will leave the CEO post after 15 years marked by supply-chain dominance
Published: April 21, 2026 at 11:17 a.m. ETShareResizeTim Cook will be stepping down from Apple’s CEO post in September. Photo: MarketWatch photo illustration/Getty Image, iStockphoto
Tim Cook may not have had the same flash as Steve Jobs, but he wielded an unassuming superpower that helped grow Apple into a $4 trillion juggernaut.
Cook first joined Apple AAPL in 1998 and assumed the CEO role in August 2011. Before becoming CEO, Cook had established a reputation for himself as a shrewd master of Apple’s supply chain. One of his first moves at the company was pioneering a just-in-time inventory model that helped turn a struggling Apple around by aligning the company’s raw-material orders with production schedules, slashing Apple’s inventory on hand.