Box could well have launched itself onto public markets this month. But it has fought off that impulse as stocks for cloud companies have faltered in recent weeks. Instead, the cloud-based file-sharing company could end up making its debut on the New York Stock Exchange in June, according to a report today from the Wall Street Journal. Cloud software companies like Marketo, Netsuite, Salesforce.com, Workday, and Xero have tumbled lately.