The Rosen Firm has now filed a securities class action suit
"According to the lawsuit, defendants throughout the Class Period made false and/or misleading statements and/or failed to disclose that: (1) QuinStreet recklessly disregarded the occurrence of click-through fraud; (2) QuinStreet-owned websites experienced phony, low quality traffic for its clients; (3) QuinStreet’s practices were not geared toward providing its clients with valuable customers or high-quality leads or clicks; and (4) as a result, Defendants’ public statements were materially false and misleading at all relevant times. When the true details entered the market, the lawsuit claims that investors suffered damages."
https://www.businesswire.com/news/home/20180427005844/en/EQUITY-ALERT-Rosen-Law-Firm-Files-Securities