Advent Agrees to Buy Ares’ AOT, Maker of Serta Mattresses

Advent International Corp., the Boston-based leveraged buyout firm founded by Peter Brooke, agreed to buy a majority stake in AOT Bedding Super Holdings, the maker of Serta and Simmons mattresses.

The transaction values the mattress company at about $3 billion including debt, said a person with knowledge of the matter. The purchase is expected to be completed in the fourth quarter, Advent said in a statement sent by e-mail that didn’t disclose terms.

Existing investors Ares Management LLC, based in Los Angeles, and the Ontario Teachers’ Pension Plan will retain a “significant” stake in AOT Bedding, the private equity firm said in an e-mailed statement. Chuck Dohrenwend, a spokesman for Advent International, declined to specify the size of its stake or comment beyond the press release.

Competitors include Tempur-Pedic International Inc., a pioneer of memory-foam mattresses that last year became the biggest publicly traded mattress company by revenue as sales rose 28 percent to $1.42 billion. Sealy Corp. (ZZ), a 131-year-old company and user of coil-spring technology, fell to No. 2 with sales of $1.23 billion, little changed from 2010.

Serta, in a June 11 statement on its website, said it had become the “No. 1 mattress company in the U.S.” for the first time after an 18 percent sales increase in 2011, without specifying whether that was based on volume or dollar sales.

To contact the reporter on this story: Susanne Walker in New York at swalker33@bloomberg.net;

To contact the editor responsible for this story: Kevin Miller at kmiller@bloomberg.net

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