The stock market has just undergone a major transformation

After the bell Friday, around $2.8 trillion in equities reshuffled into the newly created communications services sector.

Those changes leave the tech sector looking a little different to investors.

"What's going to be left of the technology sector is going to be largely driven by the hardware and the software and services space," explained Lindsey Bell, investment strategist at CFRA Research, on CNBC's "Trading Nation" on Thursday.

Among the biggest changes, Facebook and Google parent Alphabet moved out of tech into the new sector. Apple's leadership expanded to a 21 percent weighting, up from 17 percent, while Microsoft places second with a 17 percent weighting from 13 percent.

Apple and Microsoft as the two biggest drivers should continue to lead gains in the tech sector, says Bell.

"As those two companies switch to face higher growth and higher margin businesses — services within Apple and cloud within Microsoft — you will continue to see strong growth out of the tech sector," she said.

The tech sector also became more weighted to volatile chip stocks such as Advanced Micro Devices and Micron, but Bell believes that could be a positive.

"Semiconductors — they were 14% of the market cap, they're going to be about 17 percent — they should continue to weigh, but earnings estimates have come down so significantly right there that we think that you'll still be able to have solid growth out of this sector overall," said Bell.

Earnings growth for semiconductor stocks has been reduced to 6 percent in 2019, down from 26.5 percent, according to CFRA Research. Lowered estimates make for easier analyst beats come reporting season.

It's not just tech seeing a big change. The new communications sector absorbed the telecom space, ending its reputation as a defensive play.

"Even though the media stocks have high dividends, they're just going to be such a small component of the new sector," said Bell. "A lot of people like the sector because of the 5.4 percent dividend yield. It was a bond proxy, but now it's going to be closer to about 1.5 percent."

Alphabet has a 29 percent weighting in the new sector, while Facebook accounts for nearly 16 percent. Neither offers a dividend.

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Trading Nation is a multimedia financial news program that shows investors and traders how to use the news of the day to their advantage. This is where experts from across the financial world – including macro strategists, technical analysts, stock-pickers, and traders who specialize in options, currencies, and fixed income – come together to find the best ways to capitalize on recent developments in the market. Trading Nation: Where headlines become opportunities.

Michael Santoli

Michael Santoli joined CNBC in October 2015 as a Senior Markets Commentator, based at the network's Global Headquarters in Englewood Cliffs, N.J.  Santoli brings his extensive markets expertise to CNBC's Business Day programming, with a regular appearance on CNBC's “Closing Bell (M-F, 3PM-5PM ET).   In addition, he contributes to CNBCand CNBC PRO, writing regular articles and creating original digital videos.

Previously, Santoli was a Senior Columnist at Yahoo Finance, where he wrote analysis and commentary on the stock market, corporate news and the economy. He also appeared on Yahoo Finance video programs, where he offered insights on the most important business stories of the day, and was a regular contributor to CNBC and other networks.

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