The iPhone maker's stock has risen about 9% since Tuesday when it reported better than expected results for the three months to June.
Apple has just become the first company to be valued at $1 trillion, which is triumphant or depressing depending on how you look at it.
Before the release of the iPhone, Apple was reporting revenue of less than $20bn and profits of less than $2bn from the sale of its Mac personal computers in 2006.
The market cap is the company's total market value, calculated by multiplying the value of its stock times all shares outstanding. "I still view Apple as a pretty small company, the way that we operate".
Mega-cap tech giants like Amazon, Microsoft, and Google's parent, Alphabet, were also in the race to $1 trillion, but none could beat Apple in the end.
Wall Street thinks Apple shares can go even higher too.
January 2016: Apple announces that more than a billion of its devices are in use around the world.
Apple is a trillion-dollar company because its innovation-driven profitability creates real value, not stock manipulation.
The milestone reached Thursday marks the latest triumph of a trend-setting company that two mavericks named Steve started in a Silicon Valley garage 42 years ago. But Apple is, of course, unique, and it has made its run to $1 trillion on the back of exactly one incredibly profitable product, the iPhone. It now accounts for 4 percent of the S&P 500. Five of the 10 largest USA companies by market cap on Thursday were tech companies, including Amazon,Alphabet, and Facebook.
Apple's cult following is largely credited to Kawasaki, who coined the phrase evangelism marketing, a strategy that helps companies get customers to believe so strongly in a product that they try to convince others to buy it. That company is now worth about $205 billion.
But Cook has gradually won accolades from investors by pumping out a series of solid financial results and spreading Apple's products to China and other foreign markets. It also firmly cements Apple's place as the most valuable publicly traded company today.