Office Depot and OfficeMax are being collated.

The retailers said Wednesday they have agreed to combine in an all-stock deal worth about $1.2 billion that would transform the office-supply retail sector by helping the No. 2 and No. 3 chains compete against industry behemoth Staples.

The merger marks a move toward consolidation in an industry that is bloated with stores. It reflects the changing retail landscape as big-box stores have become outmoded and more people shop online.

"This combination will create a stronger, more global, efficient competitor able to meet the growing challenges of our rapidly changing industry," OfficeMax chief executive Ravi Saligram said in a call with analysts.

Long Island has five OfficeMax stores -- in Levittown, Elmont, Bohemia, Lawrence and Riverhead -- but no Office Depots.

Liang Feng, a Morningstar analyst, said the companies will have a lot of obstacles to overcome to succeed.

"The industry will face longer-term structural headwinds with competitors like Amazon, Costco gaining ground and the decline in demand for secular office products like paper, pens and ink," he said.

Office Depot Inc. and OfficeMax, along with bigger rival Staples Inc., were all founded in the 1980s and helped pioneer the big-box boom in the 1990s. They expanded rapidly in the United States throughout the decade.

But the rise in competition from Web retailers like Amazon.com and discounters like Costco and Wal-Mart has been tough on the sector, leading to decreased sales. In addition, office suppliers were slow to bounce back from the recession, as consumers and small businesses alike cut back on ordering office products.

Over the years, the companies have closed stores, slashed costs and streamlined operations to offset stagnant sales. But the industry was still seen as too bulky.

For years, rumors about possible consolidation have swirled around the sector. The Wall Street Journal first reported the possibility of a deal between Office Depot and OfficeMax on Presidents Day on Monday, when markets were closed.

Office Depot, based in Boca Raton, Fla., and Naperville, Ill.-based OfficeMax said holders of OfficeMax shares will receive 2.69 shares of Office Depot for every OfficeMax share they own.

With Keiko Morris

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