It characterised 2014 as a good year otherwise and highlighted a 39% rise in revenue and gross profit margin of 71% versus 59% a year earlier.
"These conditions indicate the existence of a material uncertainty which may cast significant doubt about the Group’s ability as a going concern."
<p>Hailo's auditor BDO</p>
It was also upbeat for the year ahead, hailing the arrival of new boss Andrew Pinnington.
In the accounts it said it was confident of securing more funding, but does not yet have any committed.
“The directors are currently reviewing funding options from a number of different sources and indications of interest from both existing and potential new shareholders to pursue,” it said.
If further investment is not forthcoming, Hailo said it also has the opportunity to draw a further $3.9 million from a convertible loan note.
But Julian Frost of auditor BDO said: “These conditions indicate the existence of a material uncertainty which may cast significant doubt about the Group’s ability as a going concern.”
Hailo was set up by three London cabbies and three tech entrepreneurs in 2010 and counts Sir Richard Branson among its backers.
Last year its London operation dropped its support for minicabs to focus exclusively on black cabs.
It has found stiff competition in US firm Uber, which has won fans due to the convenience of its app.
