* Bids of up to 400 mln stg for Card Factory, sources say
* Sources say Permira and Summit Partners among bidders
* Cinven, Warburg Pincus also bid - sources
LONDON, March 9 (Reuters) - A clutch of private equity firms have bid up to 400 million pounds ($599.5 million) for British greetings card retailer Card Factory, sources familiar with the process said, as buyout firms scour the sector for deals.
European buyout houses Permira [PERM.UL], Cinven [CINV.UL] and Summit Partners, a U.S. firm specialising in minority and majority investments, are among the firms to have submitted bids for the retailer, which operates some 480 stores across the UK, the sources said on Tuesday.
Warburg Pincus also bid, one of the sources said.
Husband and wife team Dean and Janet Hoyle, who started Card Factory in 1997, kicked off a sale of the business last month after calling in KPMG [KPMG.UL] to advise on their options. [ID:nLDE60R2GZ]
Summit Partners was unavailable for comment, while the other private equity firms and KPMG declined to comment.
Deal activity in the British retail sector has warmed up since the start of the year, with a number of businesses including sofa retailer DFS courting deep-pocketed private equity buyers.
One of the first-round bids for Card Factory came in at about 400 million pounds, though other bids are some way below that level, one source said.
Bidders are finding the business difficult to value because it is growing so quickly, the source said.
The business is attractive because of its high margins, though prospects for future growth could be limited, another source said.
Card Factory is expected to post earnings before interest, tax, depreciation and amortisation of about 50 million pounds in the year to the end of January 2010, sources previously told Reuters.
The business posted profits of about 30 million pounds the previous year, according to accounts filed with Companies House.
Card Factory failed to respond to requests for comment. (Editing by Douwe Miedema and David Holmes) ($1=.6672 Pound) (email@example.com; +44 20 7542 9969; Reuters Messaging: firstname.lastname@example.org))
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