What happened Shares of videoconferencing specialist Zoom Video Communications (NASDAQ: ZM) are slumping today. The decline comes in the wake of news that a COVID-19 vaccine from Pfizer and BioNTech prevented over 90% of infections in human trials including tens of thousands of volunteers. Additionally, no serious safety concerns have been identified. Some investors are betting stocks that benefited from people sheltering at home could now cool off if lockdowns ease amid a successful deployment of vaccines. Image source: Zoom Video Communications. So what Zoom was one of the biggest beneficiaries as consumers and workers sheltered at home. People turned to the platform to collaborate virtually, leading to skyrocketing revenue and profitability. For the three-month period ending July 31, Zoom announced a 355% year-over-year increase in revenue. On $664.5 million of revenue, the company raked in $373.4 million of free cash flow. This was up from free cash flow of $17.1 million in the year-ago quarter. Given the growth stock has soared more than 500% this year, it's not surprising to see shares selling off some as investors speculate about a return to more normalcy in 2021 and beyond. Now what Management said in its third-quarter update that it anticipated even greater fiscal fourth-quarter revenue. The company guided for record revenue between $730 million and $750 million during the period. While a slowdown in Zoom's growth story should be expected as the economy reopens, it's unclear both how quickly vaccines can be rolled out to the masses and by how much the company's growth will slow. Before the pandemic, Zoom was already notably expanding at near-triple-digit growth rates. 10 stocks we like better than Zoom Video CommunicationsWhen investing geniuses David and Tom Gardner have a stock tip, it can pay to listen. After all, the newsletter they have run for over a decade, Motley Fool Stock Advisor, has tripled the market.* David and Tom just revealed what they believe are the ten best stocks for investors to buy right now... and Zoom Video Communications wasn't one of them! That's right -- they think these 10 stocks are even better buys. See the 10 stocks *Stock Advisor returns as of October 20, 2020 Daniel Sparks has no position in any of the stocks mentioned. The Motley Fool owns shares of and recommends Zoom Video Communications. The Motley Fool has a disclosure policy.Source