That put Apple on a path to overtake Exxon Mobil in 2011 as the largest US company by market value. It now accounts for 4 percent of the S&P 500.
Adjusted for splits, Apple's stock price has risen almost 40,000% since its initial public offering in 1980.
October 2011: Jobs, 56, dies after battling pancreatic cancer, having turned over command of Apple to Tim Cook earlier in the year. That put Apple on a path to overtake Exxon Mobil in 2011 as the largest US company by market value.
The pace of growth in Apple's market cap really picked up steam in the late-2000s, which coincided with the launch of the first-generation iPhone.
The first company to ever be worth $1 trillion was Petrochina, which reached the valuation briefly on its first day of trading, following its 2007 IPO.
Jeff Carbone, co-founder of Cornerstone Financial Partners in Charlotte, North Carolina, has included Apple in his clients' portfolios for about a decade.
Apple said it expects revenue of $60 billion to $62 billion for the fiscal fourth quarter that ends in September 30. Jobs returned the next year, and the company got back to making innovative and elegant consumer products: from iMac to iPod to iPhone.
"There's optimism now that the U.S. style of threatening tariffs may ultimately come to fruition in a deal", said Brad Neuman, director of market strategy at Alger, a growth equity asset management firm in New York City.
It is selling fewer iPhones, but by releasing a more expensive version a year ago, it is making more money per device.
Apple's rise in recent years has signaled the strength of the technology industry.
Other companies have come close to the mark, but no public United States company has hit a $1 trillion valuation. Speaking of which, Microsoft's Dot Com-era boom-time high would be worth about $930 billion today.
Apple is in the unique situation of controlling the hardware and software in its mobile devices, with content for users required to go through its App Store that takes a percentage of revenue.