Growth stock investors may want to mark their calendars. Next week includes quarterly updates from three fast-growing tech companies. Cloud database company MongoDB (NASDAQ:MDB) is scheduled to report its fiscal second quarter after market close on Sept. 4. On the following day, e-signature specialist DocuSign (NASDAQ:DOCU) and videoconferencing company Zoom Video Communications (NASDAQ:ZM) will be releasing their fiscal second-quarter results.

Ahead of their quarterly earnings releases, here's an overview of some of the areas investors will want to watch.

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MongoDB

MongoDB easily beat expectations earlier this year when it reported its fiscal first-quarter results. Fiscal first-quarter revenue increased 78% year over year to $89.4 million. In addition, the company added 1,000 customers between its fourth quarter of fiscal 2019 and its first quarter of fiscal 2020, bringing total customers to 14,200.

MongoDB Atlas, the company's multicloud database service, has been a major driver of MongoDB's growth. MongoDB Atlas revenue in fiscal Q1 increased 340% year over year. Will this wild momentum for Atlas continue in fiscal Q2?

On average, analysts expect MongoDB's total fiscal second-quarter revenue to rise 59% year over year to $91.6 million. For the company's non-GAAP (adjusted) earnings per share, analysts are modeling for a loss of $0.28 -- narrower than a $0.30 loss in the year-ago period. 

DocuSign

Electronic document company DocuSign saw its revenue growth accelerate in its most recently reported quarter. Revenue rose 37% year over year in its first quarter of fiscal 2020. This was an acceleration from 34% revenue growth in its fourth quarter of fiscal 2019. 

Given this acceleration in the company's top-line growth, investors will likely be watching DocuSign's revenue growth closely. Management guided for its fiscal second-quarter revenue to be between $218 million and $220 million. But analysts are calling for revenue of $220.8 million, translating to a 33.6% growth rate.

Zoom Video Communications

Zoom Video obliterated expectations in its inaugural quarterly update earlier this year, following its IPO in April. The company's fiscal second-quarter revenue soared 103% year over year to $122 million. Its non-GAAP earnings per share for the period was $0.03, up from breakeven in the same quarter of the prior year. Analysts, on average, were expecting revenue of about $112 million and non-GAAP EPS of $0.

Key to the company's growth was an 86% year-over-year increase in customers with 10 or more employees and a 120% jump in customers contributing over $100,000 in trailing-12-month revenue.

Can Zoom keep up this staggering growth in $100,000 customers?

Analysts, on average, expect Zoom to report revenue and adjusted earnings per share of $130.3 million and $0.01, respectively, in its fiscal second quarter.