Law Firm Announces Investigation on Behalf of Uber Technologies Inc Investors

What do you suppose this is about?

https://www.businesswire.com/news/home/20190813005793/en/INVESTOR-ALERT-Law-Offices-Howard-G.-Smith

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  • Apparently Pivotal, Pluralsight and Zuora are also being sued by the same law firm (http://www.howardsmithlaw.com/index.html)

  • What the heck could this be about? They just IPO'd and the investors are mad the stock is down? Why would that be a reason to sue... Or I assume sue... Why would this require an investigation? Might be a dumb question