NEW YORK (TheStreet) --CNBC's Bob Pisani appeared on Wednesday's "Squawk on the the Street" from the Floor of the New York Stock Exchange to discuss why September will be the best month for IPOs. 

Last week, Novan (NOVN), The Trade Desk (TTD), e.l.f Beauty (ELF), Apptio (APTI), and Valvoline (VVV) all priced and have all seen moves to the upside.

Novan is up 100%, The Trade Desk is up 66.6%, e.l.f Beauty is up 44.7%, Apptio is up 32.4%, and Valvoline is up 7.6%.

Another IPO pricing tomorrow night is Nutanix (NTNX). It is a unicorn (a start-up valued at over $1 billion) offering computer storage technology. It will offer 14 million shares at $13-$14, and Pisani explained why the initial offering price is key.

"This morning they announced a higher price, this is very important because the prior price talk was $11-$13, now $13-$15. Why is it important? Because at the old price talk, the midrange of about $12 was below the prior round of series of funding," Pisani noted.

If Nutanix had announced a price with a mid-range of $12 other companies in the unicorn space would have had cause for concern.

"This would have been a big problem for other unicorns that are sitting there watching these companies and wondering are they going to get close to the private valuations that are out there. This is very good news for the overall unicorn business pricing above earlier prices," Pisani explained.

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