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A filing was made last week by Restoration Hardware Holdings Inc. (NYSE: RH) to allow its insiders and backers to sell shares in a secondary offering. While the stock has almost doubled since its mid-April IPO, we did not have a real idea about how many shares would be freed up for sale. Now we know, and it is close to $1 billion worth of stock.

Restoration Hardware’s backers will sell up to 12 million shares of common stock, but if the overallotment is taken in full then it would be 13.8 million shares worth some $1.047 billion. The underwriting group includes BofA Merrill Lynch and Goldman Sachs as the book-runners. Co-managers in the syndicate are Baird, William Blair, Jefferies, Piper Jaffray, Stifel, and Wells Fargo.

Home Holdings’ equity interests are held by funds affiliated with the private equity funds of Catterton, Tower Three, and Glenhill. They will be in the selling group of holders. Thomas Mottola is a director and he is planning to buy up to $7 million worth of shares in the offering.

Restoration Hardware shares rose almost 2% on Monday to $77.18 against a post-IPO trading range in the last three months of $30.32 to $77.36. Its shares were down 1.4% at $76.09 in the after-hours session after the filing was made. The size of close to $1 billion compares to a market cap of about $3 billion at the time if the latest filing.