Many reasons can contribute to this phenomenon actually. It depends on the dividend policy specified at that time and what qualified as dividend. Looks like this is a very special case, as highlighted in the filing there's no current dividend but there was historical ones and that was before & during times of transition - reorganization of the company.
"Pursuant to the operating agreement, the LLC has historically made monthly cash distributions to its members, including those affiliated with our directors, executive officers or beneficial holders of more than 5% of our capital stock. The members of the LLC affiliated with Jonathan Oringer, Insight Venture Partners and Adam Riggs received aggregate distributions of $49.9 million, $18.7 million and $6.4 million, respectively, for the three years ended December 31, 2011. From January 1, 2012 to April 30, 2012, such members of the LLC have received aggregate distributions of $7.4 million, $2.8 million and $0.9 million, respectively. The LLC intends to continue making monthly cash distributions to its members, up until the time of the Reorganization."
As a part of the operating agreement, the LLC had cash distributions to members and holders of the capital stock and those affiliated other qualifying organizations.
These were prior cash distributions prior to going public. They could technically do whatever they want with revenues or profits that they retained in the past as private company.
"Dividend Yield. Prior to this offering, while we were structured as a limited liability company, we historically paid cash dividends or distributions to our members. Once we complete this offering, we do not intend to pay cash dividends or distributions in the foreseeable future. Consequently, we used an expected dividend yield of zero."