Online marketplace Notonthehighstreet.com saw sales grow 25% year on year for the four weeks to Christmas Eve.
Jewellery and homeware were among the strongest categories for the business, up 23% and 34% respectively.
The number of returning customers grew 35% year on year, while the number of new shoppers was up 12% on 2014 to 500,000.
Transactions on smartphones increased 110% on last year, contributing 23% of gross sales over the weekend before Christmas.
The business expects full year gross sales, for the 12 months to December 31, to reach £155m, up from £127m last year.
Chief executive Simon Belsham said: “Over the past 12 months, we’ve seen strong momentum in sales as we continue to work closely with our partners to evolve our offer. This includes the development of new categories like experiences as well as innovation in our core categories like home and jewellery.
”Our creative small businesses continue to lead the market in terms of breadth and uniqueness of product designs, connecting with customers who want what they buy to say something about who they are.”