Sunrun, fresh off of its IPO announcement, has something else to celebrate. In the first quarter of the year, it installed more residential solar than any other firm not named SolarCity or Vivint Solar. That’s according to the latest edition of GTM Research’s U.S. PV Leaderboard, released today.

While SolarCity and Vivint continued to dominate the U.S. residential solar market with a combined market share of 45 percent in Q1 2015, it’s a close race for the No. 3 spot. Sunrun installed 3 percent of U.S. residential solar in the first quarter of the year, and Sungevity and NRG Home Solar were close behind, both installing 2 percent.

Any of these three firms have the potential to be the third-ranked installer by the end of 2015. Nicole Litvak, senior solar analyst at GTM Research, provides the case for each.