Apple is the reigning king of Wall Street, the newest and only member of Wall Street's $1 Trillion Stock Club. 

Who's next? 

That's the $1,000,000,000,000 question  stock traders and 401(k) investors are pondering after the iPhone maker on Thursday became the first U.S. publicly traded stock to surpass a market value of $1 trillion.

Finding companies with the clout, the sales, the killer product and the dominance to grow into a stock with a 13-digit market capitalization is all about focusing  on the giants, the biggest companies that populate the large-company Standard & Poor's 500 stock index. 

Gaining entrance to the club isn't about who you know. It's all about corporate wealth – or how much a  company is worth measured in stock value.

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An electronic screen displays Apple stock at the Nasdaq MarketSite, Thursday, Aug. 2, 2018, in New York. Apple has become the world's first publicly traded company to be valued at $1 trillion. The milestone marks the triumph of stylish technology that has redefined what we expect from our gadgets ever since two mavericks named Steve started the company 42 years ago. (AP Photo/Mark Lennihan) ORG XMIT: NYML102
Mark Lennihan, AP

Here are three American-born tech giants that could soon be hanging out with Apple in $1 trillion stock club.

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FILE - This June 4, 2014 file photo shows Amazon boxes in Phoenix. Amazon reports quarterly financial results on Thursday, July 23, 2015. (AP Photo/Ross D. Franklin) ORG XMIT: NYBZ109
Ross D. Franklin, AP

Amazon

(Market value: $889 billion; 12.5 percent shy of $1 trillion) 

The Jeff Bezos-led juggernaut is not only the king of the retail e-commerce space, with roughly 50% of the total market, according to eMarketer, it is also a lead player in the public cloud computing business via its Amazon Web Services unit. Additionally, Amazon makes lots of money – and its earnings are expected   to keep growing at a fast clip. In the quarter that ended in June, Amazon reported sales of $52.9 billion and a profit of $2.5 billion, the first time its quarterly net income has topped $2 billion. The company told Wall Street it expects third-quarter net sales  of $54 billion to $57.5 billion, which equates to year-over-year growth of 23 percent to 31 percent. After Amazon's strong second-quarter results, Michael Graham, an analyst at Canaccord Genuity, raised his price target from $2,000 a share to $2,100. Achieving that would hurtle Amazon past the $1 trillion market value barrier. The bull case of Morgan Stanley analyst Brian Nowak is $2,800, which would propel Amazon's market capitalization to nearly $1.4 trillion. Amazon shares closed at $1,823.29 on Friday.

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FILE - In this Monday, Feb. 1, 2016, file photo, electronic screens post prices of Alphabet stock at the Nasdaq MarketSite in New York. Business is booming at Google’s parent company, Alphabet Inc., even as it loses billions of dollars on risky projects that may never produce any revenue. (AP Photo/Mark Lennihan, File) ORG XMIT: NYBZ491
Mark Lennihan, AP

Alphabet

(Market value: $851 billion; 17.5 percent shy of $1 trillion) 

Google is the place many people go for  internet searches. The world's leading search engine has leveraged that into a massive advertising business that helps Google parent Alphabet ring up huge profits. The company reported sales of $32.7 billion and a profit of $3.2 billion in this year's second quarter, and that was after accounting for a $5.1 billion fine imposed by the European Commission. Alphabet also is sitting on lots of cash —  $102.3 billion as of June 30. The money  allows it to buy back its own shares, which makes the company's earnings look even better, as well as invest in itself. The company spent $5.1 billion in research and development in the second quarter, money that's being put to work in investments such as Waymo, its self-driving-car project, artificial intelligence projects and its YouTube video streaming service. 

More: How Tim Cook and the iPhone made Apple America's first $1 trillion company

More: Apple makes history by becoming first US company to reach $1 trillion market value

More: Apple jumps after strong third-quarter report

KeyBanc Capital Markets analyst Andy Hargreaves continued to recommend the company's shares in a note to clients July 23, writing that "Alphabet continues to invest heavily in front of large growth opportunities, while its core ad business continues to churn out impressive growth.” Alphabet shares closed at $1,238.16 on Friday.

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FILE - This July 3, 2014, file photo, shows the Microsoft Corp. logo outside the Microsoft Visitor Center in Redmond, Wash. Microsoft said Monday, June 13, 2016, it is buying professional networking service site LinkedIn for about $26.2 billion. LinkedIn, based in Mountain View, Calif., has more than 430 million members. (AP Photo Ted S. Warren, File) ORG XMIT: NYBZ101
Ted S. Warren, AP

Microsoft

(Market value: $830 billion; 20.5 percent shy of $1 trillion) 

Under CEO Satya Nadella, Microsoft has transformed itself from an "old tech" company to one on the cutting edge of one of the tech industry's fastest-growing businesses: cloud computing. A 23 percent jump in revenue to $9.6 billion in the quarter ended in June helped drive a 17 percent overall increase in sales to $30.1 billion. "Our early investments in the intelligent cloud ... are paying off," Nadella said in the company's most recent earnings report. Wall Street analysts remain bullish on the stock, with Oppenheimer's Timothy Horan recently raising his price target to $120. That would put the shares within striking distance of a $1 trillion market cap. "We expect a very strong next few quarters," Horan told clients in a research note. Microsoft shares closed at $108.04 Friday.