There were three initial public offerings (IPOs) on the calendar last week and there are seven on the calendar for this week. After a lull around the Labor Day holiday, the coming week is the busiest of the third quarter.

Included in last week's IPOs were Social Capital Hedosophia Holdings (NYSE:IPOA.U), a blank-check company that plans to acquire a large private tech firm. The company raised $600 million at a market cap of $750 million. Units got a first-day pop of 3.1% and closed the week up 5.1%.

Draper Oakwood Technology Acquisition (DOTAU), another blank-check company seeking to acquire a venture-backed tech company, raised $50 million at a market cap of $66 million. Shares added 1.3% on Friday, the company's IPO date.

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Tremont Mortgage Trust (TRMT) is a commercial mortgage REIT that raised $50 million at a market cap of $62 million. Shares dropped 13.6% on the first day of trading and closed the week down 18%.

Through the week ending September 15, IPO ETF manager Renaissance Capital reported that 93 IPOs have priced in the United States so far this year, up nearly 48% year over year. Total proceeds raised through last week equaled $22.2 billion, up 119% year over year.

For 2016, Renaissance Capital reported a total of 105 IPOs, down 38% year over year from 170 in 2015. Total 2016 proceeds amounted to $18.8 billion compared with a 2015 total of $30 billion. Renaissance Capital does not include “best efforts” or blank-check companies in its totals, nor does it include IPOs that raise less than $10 million.

First on the calendar for the coming week is Best, a China-based delivery company backed by Alibaba Group Holdings that plans to offer 62.1 million shares in an expected price range of $13 to $15 to raise $869.4 million at an implied market cap of $5.3 billion. Underwriters include Citi, Credit Suisse, Goldman Sachs (Asia), JPMorgan, Deutsche Bank, CITIC Securities, KeyBanc Capital Markets, Oppenheimer and Stifel. Shares are expected to price Tuesday and begin trading Wednesday on the New York Stock Exchange under the ticker symbol BSTI.

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Celcuity is a biotechnology firm using cellular analysis to discover new cancer subtypes with the aim of commercializing diagnostic tests for the diseases. The company plans to offer 2 million shares in an expected price range of $8 to $10 to raise $18 million at an implied market cap of around $84 million. The sole underwriter is Craig-Hallum Capital Group. Shares are expected to price Tuesday and begin trading Wednesday on the Nasdaq under the ticker symbol CELC.