Less than five months since its initial public offering, the AIM-quoted firm has more than 550,000 UK residential property listings on its site.
“We are extremely pleased that, as a result of our reported growth in contracted agents, OnTheMarket.com is now displaying well over half of the market in terms of UK residential properties,” said chief executive Ian Springett.
“The very strong and growing agent support for our proposition has enabled us to rapidly gain ground on the market share of property listings of our long-established key competitors.”
He added: “We remain committed to creating an agent-backed, full scale challenger portal that injects some much-needed competition into the property portals landscape by disrupting what has for too long been effectively a cosy duopoly.”
Shares were up 2.5% to 161.9p in early afternoon trading.