A trader working in New York City after the Nasdaq opening ceremony on April 18, 2019.

I have Betancur | Getty Images

Check out the companies that hit the headlines on Monday after the bell:

Zoom video – The video communications company’s shares fell 8.5% due to better than expected results for the fourth quarter of the financial year. Zoom made $ 1.22 per share on revenue of $ 882 million. Analysts polled by Refinitiv expected earnings of 79 cents per share on sales of $ 812 million. This sales figure corresponds to an increase of 369% over the previous year. Zoom also expects revenue to grow 175% for the first quarter of the fiscal year and 42% for the full fiscal year.

year Roku’s stock rose 2.8% on the news the company is set to acquire NielsenVideo advertising business. “By combining Nielsen’s AVA technology with Roku’s innovative advertising technology and scale, we can take advantage of streaming TV advertising for traditional television,” said Louqman Parampath, vice president of product management at Roku, in a statement.

Novavax – The vaccine maker’s stock was down 4.2% after the company reported weaker-than-expected fourth-quarter results. Novavax lost $ 2.70 per share on revenue of $ 279.7 million. Analysts surveyed by Refinitv expected a loss per share of $ 1.49 on sales of $ 304.9 million. CEO Stanley Erck told CNBC the company was awaiting government approval for the his Covid-19 vaccine as early as May.

Inovio Pharmaceuticals – Inovio shares were down more than 6% after the company released its latest quarterly results. The company lost 14 cents per share, while analysts polled by FactSet expected a loss of 22 cents per share. Inovio also published the results of the phase 3 study for a drug to treat HPV.