 Mostiștea Ulmu was founded in 2005 as "Phoenix Ulmu" and promoted for the first time in the Liga III after only one season.Distributed in the second series, Phoenix was ranked only 17th out of 18 and relegated back to Liga IV.In 2010, under the ownership of Vasile Tîrșolea, Phoenix won again Liga IV – Călărași County and after a promotion play-off against Nova Force Giurgiu, Giurgiu County champions, the team from Ulmu advanced again in the third tier.