Stock market live updates: Tech rout pushes Nasdaq into correction, Dow drops 600, Tesla worst day ever

This is CNBC's markets live blog that will be updated throughout the day. 

The equity rout in technology shares worsened on Tuesday as investors rotated out of companies that led the market's historic comeback. The tech-heavy Nasdaq Composite underperformed once again after suffering its worst week since March. Chip stocks were among the biggest losers as tensions between U.S. and China continued to escalate. Here's what's happened:

Tuesday's sell-off by the numbers

  • The Nasdaq Composite closed down 4.1% for its third straight daily loss for the first time since Aug. 11
  • Nasdaq is 10.03% below its closing record of 12,056.44 from Sep. 2
  • Nasdaq is up 63.58% from its 52-week low of 6,631.42 from March 23
  • S&P 500 closed down 2.78% for its third straight negative day for the first time since June 11
  • S&P 500 is 6.95% below its record close of 3,580.84 from Sep. 2
  • S&P 500 is 52.01% above its 52-week low of 2,191.86 from March 23
  • Eleven out of 11 sectors were negative Tuesday led by tech down 4.59% 
  • Dow closed down 2.25% for its third straight negative day for the first time since Aug. 19
  • Dow is 7.94% below its closing record of 29,551.42 from Feb. 12
  • Dow is down 3.64% year to date. — Gina Francolla

Apple suffers worst three-day stretch since 2008

Shares of Apple dropped 6.7% on Tuesday for the stock's third negative session in four. Apple has now dropped more than 14% since trading closed last Wednesday despite eking out a slight gain on Friday. That makes this Apple's worst three-day stretch since October 2008, according to Bespoke Investment Group. — Jesse Pound

Tesla posts largest one-day drop in history

Shares of Tesla fell 21.06% on Tuesday for the stock's single worst one-day performance on record. The drop came after S&P Dow Jones Indices decided against adding the electric vehicle company to the S&P 500. - Pippa Stevens

Nasdaq closes in correction territory

The market finished near its session lows on Tuesday, with the tech-heavy Nasdaq Composite dropping 4.1%. The Dow lost 633 points, or 2.3%, while the S&P 500 shed 2.8%. The Nasdaq has now lost roughly 10% in the last three trading sessions as major tech stocks give back some of their recent gains, bringing the index into correction territory. — Jesse Pound

U.S. economy may boom in 2021 like following World War II, says Morgan Housel

An economic boom in 2021 that resembles the surge following World War II could be in store for the U.S. economy, according to Morgan Housel, the former columnist at The Wall Street Journal and current partner at venture capital firm The Collaborative Fund.

"One thing that I think is overlooked or underappreciated today, are the odds — and this is not my baseline forecast — but the odds that 2021 could actually be one of the best years for the economy in history, which sounds ridiculous given what we are dealing with right now," Housel said on "The Exchange." 

Even so, Housel said the government stimulus in response to the coronavirus pandemic, combined with more good news on the vaccine for Covid-19 heading into next year, could help lay the groundwork for a strong economic rebound. "Put all those factors together and what 2021 could look like is something most analogous to the end of World War II," he said. - Kevin Stankiewicz

Final hour of trading: Wall Street sell-off accelerates into the close, Dow down 600 points

The major averages traded around their session lows with less than an hour left as tech shares continued to get battered around. The Dow was down more than 600 points, or 2.3%. The S&P 500 slid 2.8% and the Nasdaq Composite plunged 3.8%. —Fred Imbert

Current market rotation is 'healthy,' says MKM's Darda

Michael Darda, chief economist and market strategist at MKM Partners, sees no problem with the current market drop, calling it a "largely healthy" rotation after a massive run-up in tech stocks. In a note to clients, he wrote the firm's "adjusted equity risk premium and price/liquidity models continue to show upside." However, he downgraded tech to neutral from overweight given the "rise in valuations this year." "The upside from here is likely to be clustered in the re-opening trades (industrial cyclicals and value)," said Darda. —Fred Imbert, Michael Bloom

Stocks come off session lows

The major averages lifted off their session lows with about two hours left in the trading day. The Dow Jones Industrial Average fell about 360 points, after dropping more than 600 points earlier in the session. The S&P dipped 1.7%, after falling 2.5% earlier. The technology-heavy Nasdaq Composite plunged 2.6%, after nearly reaching correction territory earlier on Tuesday. — Maggie Fitzgerald 

Virgin Galactic stock jumps after next spaceflight date revealed, UBS recommendation

Shares of space tourism venture Virgin Galactic rose as much as 12% in trading after CNBC reported on Sunday that the company plans to conduct its next test spaceflight on Oct. 22. The flight will be the first of the final two Virgin Galactic expects to complete before it flies founder Sir Richard Branson, a milestone that will mark the beginning of the company's commercial service. Additionally, UBS became the latest on Wall Street to give Virgin Galactic a buy rating, as the firm on Monday began coverage of the stock and said it sees more than 50% upside in the year ahead. UBS expects Virgin Galactic's annual sales of tickets for rides to the edge of space will be quadrupling within just a few years of the company beginning commercial services, with a compound annual growth rate of 300% through 2024.– Michael Sheetz

Stocks making the biggest moves midday

  • While most technology stocks sold off on Tuesday, Peloton jumped more than 10% after the exercise equipment maker announced a slew of new products, including a lower-priced, high-tech treadmill and a more expensive bike option with a rotating screen. 
  • Bank stocks struggled on Tuesday as bond yields fell. Shares of JPMorgan, Bank of America and Goldman Sachs all fell more than 3%. 
  • Shares of Roku jumped more than 6% after Wells Fargo initiated coverage of the stock with an overweight rating. The Wall Street firm said the digital streaming media company is a "future advertising heavyweight."

Read more midday movers here. —Maggie Fitzgerald 

Markets at midday: Dow plunges 500 points as tech sell-off resumes

The major U.S. stock benchmarks were under pressure to start the week as last week's tech sell-off continued. The Dow was down 527 points, or 1.9%. The S&P 500 slid 2.2% and the Nasdaq Composite plunged 3%. Shares of Facebook, Amazon, Apple, Alphabet and Microsoft were all down sharply. Netflix was the relative outperformer, but was still down 0.8%. —Fred Imbert

Apple pares loss after announcing event

Apple cut its steep losses on Tuesday after the tech giant sent out an invitation for a Sept. 15 event where it’s expected to reveal new iPhones. Shares of Apple last traded 3% lower after dropping as much as 5% earlier Tuesday. — Yun Li

Oil drops more than 8%, hits lowest level since June

Oil slid to its lowest level since June on Tuesday as demand fears pressured prices. West Texas Intermediate crude, the U.S. oil benchmark, shed $3.51, or 8.8%, to trade at $36.26 per barrel. International benchmark Brent crude traded 6.24% lower at $39.39.

"Today's oil price move is a clear sign that the market now seriously worries about the future of oil demand," said Paola Rodriguez-Masiu, senior oil markets analyst at Rystad Energy. - Pippa Stevens

Nasdaq 100 developed bearish pattern last week, chart analyst says

Andrew Thrasher, founder of Thrasher Analytics, noted the Nasdaq 100 index developed last week a "bearish engulfing candle," a move that could signal further declines for the tech-heavy benchmark. The candle was developed after last week's high and low exceeded those of the previous week. The index also posted a weekly loss last week.

This "signifies a great deal of unrest within the price action, seeing an expansion in price volatility with a higher-high and lower-low all in a single week," Thrasher said in a note to clients. "This is not an overly uncommon candle pattern, but it's unique to see it happen while at a 52-week high."

Thrasher highlighted the last time such a move happened was in the fourth quarter of 2018, just before stocks sold off into year-end. —Fred Imbert

Young investors still have time to take profits in tech stocks, says Cramer

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Cramer: It's not too late for 'newbie' investors to profit off of tech stocks

CNBC's Jim Cramer advised first-time investors who have been riding the wave of high-flying tech stocks to sell in order to lock in profits

"I implore the people who are newbies, do you know what you own? Do you know why you own it? Do you own it just for momentum? If that's it, sell," Cramer said on "Squawk Box." "These people who are just in there because they think stocks only go up, they are the ones who are going to get hurt."

Cramer recalled the bursting of the dot-com bubble roughly two decades ago, saying investors who made massive gains on paper lost them when the market sold off steeply. 

"We didn't scream 'sell' enough in 2000. We can't do that now," Cramer said. "You should've sold then and therefore, maybe you should have sold now."  - Stankiewicz 

Here are Tuesday’s biggest analyst calls of the day: Disney, Delta, Nio, Roku, Boeing & more

  • Deutsche Bank upgraded Dave and Buster's to buy from hold.
  • Goldman Sachs downgraded Wynn to neutral from buy.
  • Wells Fargo initiated Roku as overweight.
  • MKM upgraded Occidental Petroleum to buy from neutral.
  • Deutsche Bank initiated Nio as buy.
  • Deutsche Bank upgraded Disney to buy from hold.
  • Morgan Stanley initiated JetBlue, Delta, Southwest as overweight.
  • Leerink downgraded Moderna to underperform from market perform.
  • Goldman Sachs initiated Foot Locker as buy.
  • Morgan Stanley initiated Boeing as underweight.
  • Argus upgraded Verizon to buy from hold.
  • UBS initiated Virgin Galactic as buy.

Pro Subscribers can read more here. - Michael Bloom

Nasdaq correction watch

The swift reversal in the technology sector is pushing the Nasdaq Composite close to correction territory, or a 10% drop from a record high. Based on Wednesday's record Nasdaq Composite close of 12,056.44, correction level (10% drop) would occur at 10,850.80.  Session low at the moment is 10,875.17.

On Tuesday, the Nasdaq also fell below its 50-day moving average level of 10,882.36 for first time since April 21 on an intraday and a closing basis. — Yun Li, Peter Schacknow

Chip stocks under pressure

Semiconductor stocks were among Tuesday's biggest losers after the U.S. Department of Defense floated the idea of blacklisting China’s largest chipmaker SMIC. A Defense Department spokesperson said Saturday the U.S. is in discussions over whether SMIC should be added to the Commerce Department's entity list. Imposing export controls on SMIC would impact U.S. companies that sell chip-making technology to China manufacturers. Officials also recently announced it will further tighten restrictions on Huawei Technologies in order to crack down on the telecommunication company's access to commercially available chips.

The VanEck Vectors Semiconductor ETF (SMH) fell 4% in morning trading on Tuesday. Applied Materials, LAM Research, KLA and ON Semiconductor all tumbled at least 7%, while Nvidia and ASML both dropped more than 6%. — Yun Li

Tech rout resumes, Dow falls 350 points

The sell-off in technology shares deepened on Tuesday as investors continued to dump high-flying names. The Nasdaq Composite fell 3.6% at the open after suffering its worst week since March. The Dow slid about 350 points, while the S&P 500 lost 2%. The biggest laggards in the Nasdaq on Tuesday morning include Tesla, Moderna, KLA, Nvidia and Apple. — Yun Li

Chipmakers, Apple leading Nasdaq 100 futures lower

Shares of Nvidia, Applied Materials and Lam Research — along with Apple and Tesla — were among the biggest Nasdaq 100 decliners heading into the 9:30 a.m. ET open. Nvidia and Apple slid more than 5% and Applied Materials was down over 6%.

Tesla was the biggest laggard in the index during premarket trading, plunging more than 14%. Other laggards included, Moderna, KLA Corp, DocuSign and PayPal. 

'High-fliers sell some,' says Cramer

Stocks were poised to open in negative territory on Tuesday after the Nasdaq Composite posed its worst week since March, while the Dow and S&P 500 registered their worst weekly performance since June. Amid the sell-off, CNBC's Jim Cramer said investors should take profits.

"High-fliers sell some--please please please," he said Tuesday in a tweet.

"As i said last week - there must be selling by those on margin [There] must be selling if you don't know what you own. If you are a paper millionaire sell sell sell .. buy back lower ... but take something off the table.. S&P is good!" he added. — Pippa Stevens

SoftBank reportedly responsible for billions of tech stock purchases, dubbed 'Nasdaq whale'

Japan's SoftBank was the buyer of billions of dollars in technology company options in the past month, the Financial Times said last week. SoftBank was reportedly the "Nasdaq whale," driving up volumes and contributing to a trading frenzy in highly flying technology names in the past few weeks, the report said. Technology stocks are selling off on Tuesday, continuing a tumble from last week which analysts believe is derived from worries that the massive tech run-up pushed valuations to unsustainable levels. SoftBank, through its $100 billion Vision Fund, has made big investments on privately held technology start ups. The big investments in the options market is new territory for the investment firm.— Maggie Fitzgerald 

Deutsche Bank slaps buy ratings on Disney, shares rise

Disney's stock ticked up nearly 1% on Tuesday following an upgrade to buy from hold from Deutsche Bank. The Wall Street firm said Disney is "succeeding in the land grade phase of Direct-To-Consumer" with its streaming service Disney+. Disney "has the most clear path to successfully transitioning its general entertainment programming and content production businesses into a globally scaled, vertically integrated streaming entertainment leader," Deutsche Bank research analyst Bryan Kraft told clients. Deutsche also hiked its 12-month price target to $163 per share from $128 per share, implying a 20% rally from the stock's current level. — Maggie Fitzgerald 

Shares of electric truck maker Nikola surge after General Motors announces 11% stake

Shares of Nikola soared nearly 30% in premarket trading on Tuesday after General Motors said that it's taking an 11% stake in the electric truck maker. General Motors also said it will  produce its marquee hydrogen fuel cell electric pickup truck the Badger by the end of 2022. GM is getting a $2 billion stake in Nikola and the right to nominate one board member in exchange for in-kind services. Shares of General Motors rose nearly 6% before the opening bell. Nikola founder and Executive Chairman Trevor Milton said the partnership gives Nikola access to GM's validated parts as well as its Ultium battery technology and a multibillion dollar fuel cell program. Nikola began trading June 4 after a reverse merger with VectoIQ, which is a publicly-traded special purpose acquisition company. The stock has rallied nearly 250% since its IPO. — Maggie Fitzgerald 

Tech stocks continue to struggle

The tech sell-off picked up again on Tuesday morning, with Nasdaq 100 futures dropping 2%. The dip comes on the heels of a 1.3% loss for the Nasdaq Composite on Friday and a nearly 5% decline on Thursday. The largest tech stocks also struggled in premarket trading. Shares of Apple fell 4.6%, while Amazon slid 3.9% and Microsoft lost 3.3%. — Jesse Pound 

Tesla shares under pressure after S&P snub

Shares of Tesla dropped more than 13% in premarket trading on Tuesday after the electric vehicle company was not added to the S&P 500 index. Many investors expected the company to be added to the benchmark on Friday when S&P Dow Jones Indices announced the quarterly rebalance. Shares of Tesla are still up more than 300% this year. - Pippa Stevens

UBS says tech is expensive, 'but not in a bubble'

The tech sector suffered last its biggest one-day decline in more than five months, raising questions about the health of the market's best-performing stocks moving forward. But Mark Haefele, chief investment officer at UBS Global Wealth Management, thinks this is just a correction after a massive run-up in the sector. "The sector is expensive, but not in a bubble," Haefele wrote in a note. "The US tech sector has climbed to its highest post-dotcom valuations ... But, using the tech-heavy Nasdaq composite as a proxy, valuations are still well below levels seen at the height of the dotcom bubble of the late 1990s levels, when the index forward P/E rose above 70x." Haefele added that a correction "need not signal the end of the rally." —Fred Imbert, Michael Bloom

Stock futures point to a drop on Wall Street as tech shares fall

U.S. stock futures were under pressure on Tuesday morning as tech — the best-performing market sector year to date — was headed for another big drop. Dow Jones Industrial Average futures were down 34 points, or 0.1%. S&P 500 futures slid 0.8% and Nasdaq 100 futures dropped 2.5%. Shares of Facebook, Amazon, Netflix, Google-parent Alphabet and Microsoft all traded more than 3% lower in the premarket. Apple shares were down 4.4%. Those tech losses came after the sector suffered last week its worst sell-off in more than five months. —Fred Imbert