Gus, the owner of Argos and Homebase, has acquired shopping comparison site PriceGrabber.com for £270m.
The move is seen as beefing up its Experian consumer credit division, which offers online services such as credit checking and mortgage comparison to consumers.
The division will now account for more than 20 per cent of Experian, whose core operation is to offer marketing and information services to businesses.
But the move may alarm consumers who suspect that the site will now face conflicts of interest in comparing prices from some Gus competitors.
Don Roberts, Experian's chief executive, said: "We want consumers to think of Experian when they have something important to do in their lives."
PriceGrabber has 30 major private owners who include friends and family of the website's founders. The company's management team will stay on with Experian.
The site allows shoppers to compare prices on hundreds of thousands of items from more than 9,000 retailers. Best known in the US, it recently expanded into the UK. It claims to be able to offer a 20 per cent average saving by shopping around.
Cotton seedling freezes to death as Chang'e-4 shuts down for the Moon's 14-day lunar night
Fortnite easily out-earns PUBG, Assassin's Creed Odyssey and Red Dead Redemption 2 in 2018
Meteor showers as a service will be visible for about 100 kilometres in all directions
Saturn's rings only formed in the past 100 million years, suggests analysis of Cassini space probe data
New findings contradict conventional belief that Saturn's rings were formed along with the planet about 4.5 billion years ago