By Drew FitzGerald And Chelsey Dulaney 

Staples Inc. agreed to buy Office Depot Inc. in a $6.3 billion deal that would leave the U.S. with a single office-supply superstore to compete with the discounters and Web retailers that have invaded its turf.

The acquisition, which comes a little over a year after Office Depot merged with OfficeMax, will have to win approval from regulators who shot down a merger of the same companies 18 years ago.

In approving the deal between Office Depot and OfficeMax, the Federal Trade Commission acknowledged that the market for pens, Post-it Notes and file folders has changed significantly because of competition from the Web. The announced merger Wednesday, however, would bring the number of national office suppliers down to one from two, a change that could garner more scrutiny from regulators than before, experts said.

Many Staples and Office Depot stores sit within 5 miles of each other, Staples Chief Executive Ron Sargent told analysts on a conference call. The move to combine two of the largest corporate supply distributors also could raise questions.

Staples executives Wednesday said they didn't know much about the FTC's stance toward the deal, though they stressed the new competition that didn't exist the first time around.

"Amazon just launched a business-to-business office products initiative, " Mr. Sargent said. "They're knocking on the door."

Staples agreed to pay Office Depot $250 million if antitrust concerns scuttle the deal. The company's shares fell 8.5% in early trading to $17.40. Office Depot's shares rose 1.5% to $9.41, well below the $11 a share value of the deal.

Executives from both companies said the proposed merger would have no immediate effect on their fleet of more than 4,000 stores. Office Depot is in the process of closing hundreds of stores as it works through duplicative locations left over from its merger with OfficeMax. Staples last year said it would close roughly 225 stores in an effort to boost its profitability.

Staples said Wednesday that it has been in talks to buy Office Depot since September and expects the deal to close by the end of the year. It values Office Depot at $11 a share, a premium of 44% over the closing price of Office Depot shares as of Feb. 2, when The Wall Street Journal reported the talks. The companies said they would be able to save at least $1 billion a year within three years by cutting staff, merging distribution chains and closing some stores.

The combined company will be led by Mr. Sargent.

The deal between Staples and Office Depot highlights the pressures facing brick-and-mortar retail stores as consumers shift how and where they shop. Staples' North American same-store sales haven't risen since 2007, and Office Depot's haven't risen since 2006.

The deal would likely be cheered by activist investor Starboard Value LP, which owns about 6% of Staples and 10% of Office Depot, and in January urged the companies to consider a merger. In a letter to Mr. Sargent, Starboard said the cost savings from such a combination could more than double the combined company's operating profit.

Write to Drew FitzGerald at andrew.fitzgerald@wsj.com and Chelsey Dulaney at Chelsey.Dulaney@wsj.com

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