OTA Loveholidays is reported to be poised for a £180 million sale.
A takeover of the business by private equity firm Livingbridge is expected to be confirmed this week, according to Sky News.
Livingbridge was previously an investor in On The Beach, and has broader travel industry experience through its ownership of self-catering business Sykes Cottages.
Livingbridge also supported the management buy-out of travel management company Key Travel and invested and helped with the sale of Reed & Mackay in 2016.
Loveholidays was founded six years ago by Jonny Marsh and Alex Francis, who are likely to net vast sums when the business is sold.
The deal comes as Travel Counsellors is also on the verge of being sold, to buyout firm Vitruvian Partners, Sky News reported.