Check out the companies making headlines before the bell. Nvidia — The chipmaker giant slipped nearly 2% as investors grappled with concerns the stock has become too overvalued ahead of its widely-anticipated fourth-quarter earnings release . Nvidia is slated to post its results after the market closes on Wednesday. SolarEdge Technologies — Shares dropped more than 20% after the company posted mixed quarterly results. The solar inverter maker posted a smaller-than-expected loss for the fourth quarter. However, revenue guidance for the first quarter was well below analyst expectations . Teladoc — Shares dropped 20% the morning after the online health-care company posted worse-than-expected revenue and guidance. Teladoc saw $661 million in revenue, below the $671 million forecast of analysts polled by LSEG. The company posted a loss of 17 cents per share, smaller than the 21-cent figure anticipated by analysts surveyed. When looking at the current quarter, Teladoc guided revenue between $630 million to $645 million, lower than the estimate of $673 million from analysts, per LSEG. Palo Alto Networks — The cybersecurity stock sank more than 23% after cutting its full-year revenue and billings guidance . Palo Alto Networks topped earnings and revenue expectations for the recent quarter, but said it anticipates slower growth for the full year. The company estimates that revenue growth for the year will range between 15% and 16%, versus its initial guidance of 18% to 19%. RingCentral — Shares slipped 5% after the cloud-based communications company posted mixed guidance for its current quarter and year. On the other hand, RingCentral posted fourth-quarter results that beat analyst expectations for both earnings and revenue. Toll Brothers — The homebuilder stock added 2% after the company reported fiscal first-quarter earnings of $2.25 per share, higher than the $1.78 analysts polled by LSEG had expected. The company’s revenue of $1.93 billion also beat the…
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