Blackstone is leading a 400millioninvestmentindata−securityfirmCyerathatvaluestheNewYork−basedcompanyat400 million investment in data-security firm Cyera that values the New York-based company at 400millioninvestmentindata−securityfirmCyerathatvaluestheNewYork−basedcompanyat9 billion, the Wall Street Journal reported on Tuesday, citing people familiar with the matter. ...