Mega-cap tech stocks like Apple (AAPL), Amazon (AMZN), Microsoft (MSFT), Facebook (FB), and Tesla (TSLA) (if you consider that a tech stock) have been hammered over the past few days, pulling down the S&P 500 and tech-heavy Nasdaq.

During late afternoon trading Tuesday, Tesla was down nearly 20% amid news that it won’t be part of the S&P 500. Meanwhile, Facebook was down nearly 4%, Amazon and Microsoft over 4%, and Apple over 5%. And on Tuesday, workplace collaboration app Slack (WORK) saw its stock plummet over 15% in after-hours trading following a disappointing earnings report.

That’s led to rumblings that the market — which has been bounced around by these and other massive tech names — is careening toward a second coming of the dot-com bubble of the late 1990s that came crashing down 20 years ago. That era was best epitomized by Pets.com, which, despite a flashy advertising campaign, flamed out just 9 months after its initial public offering.

But according to Capital Economics’ senior markets economist Oliver Jones, the rapid growth in tech stocks is different from the dot-com bubble for two reasons — most big-name tech stocks are fundamentally sound companies, and, despite recent volatility, tech stocks have provided a safe haven as other industries have faltered amid the pandemic.

Tech firms are delivering on fundamentals

As Jones writes in a research note, one of the key differences between the dot-com bubble and the current Big Tech market leaders is that, unlike many of those first-generation websites that took off, firms like Apple, Amazon, Facebook, and Microsoft have solid fundamentals.

“While options market shenanigans may have contributed a bit lately, the main catalyst for their rally is simply the fact that their businesses have done extremely well, in both absolute and relative terms, during the coronavirus crisis. That has not changed in the past week,” Jones wrote in note.

The tech firms aren’t just making money — they’re doing so on a sustained basis and cruising past their prior year earnings even amid a global pandemic crippling other parts of the economy.

“Bears will start to make comparisons to the [dot-com bubble] of the late nineties,” David Nelson, chief strategist of Belpointe Asset Management, wrote in a note Tuesday. “As a veteran of that war I can tell you there's little resemblance. While valuations are stretched most of the big cap secular growth stocks are profitable. That was not the case in 2000.”

Take Apple. In the second quarter of 2020, the pandemic shuttered production facilities in China and then forced it to close stores around the world outside of Mainland China. The company still managed to increase revenue year-over-year by 1% to $58.3 billion. In Q3 2020, the company saw revenue grow 11% year-over-year to $59.7 billion.