Office Depot Inc. and OfficeMax have agreed to merge in an all-stock deal that would transform the $21.2 billion office supply retail sector.

U.S.-based Office Depot Inc. and OfficeMax say holders of OfficeMax shares will receive 2.69 shares of Office Depot for every OfficeMax share they own.

That's equal to about $13.50 per share, giving the deal a total value of about $1.2 billion.

Analyst say if the deal closes, it would likely benefit the largest office supply player, Staples Inc., because the combined entity will likely close stores.