By David Benoit 

Starboard Value LP is calling for office-supply chains Staples Inc. and Office Depot Inc. to merge in a letter it plans to release Tuesday, the first time the activist has publicly declared itself in support of a tie-up of the rivals since taking a stake in Staples last month.

The investor owns a roughly 6% stake in Staples and around 10% of Office Depot.

In a letter to Staples, reviewed by The Wall Street Journal, the activist says the cost cuts in a combination could more than double operating profits and that the two chains could be more efficient about closing stores when combined.

Starboard's letter says it has met with management of both companies to urge the deal and says if Staples management doesn't seriously pursue the transaction it would be "a clear sign that significant leadership change is needed at Staples."

Representatives from Staples and Office Depot weren't immediately available for comment Tuesday.

Staples last week announced changes to its board, adding a Google Inc. executive as a new director and changing lead independent directors. The company also said it would take a step toward separating the chairman and chief executive roles, currently held by Ron Sargent. Mr. Sargent also declined to accept a raise.

Starboard's letter applauded those moves, though it said the step to separate the chairman and CEO jobs came long after shareholders voted for such a change last year. The activist said those announcements spurred it to release its letter publicly.

At Staples, the deadline to nominate board members or start a proxy fight is in early March.

Shares of Staples and Office Depot each fell in morning Tuesday. Overall, Staples is up 17% since Starboard announced its stake in December, while Office Depot has risen 19%.

Starboard has a history with office-supply stores, after first investing in Office Depot back in 2012 and fighting for board seats even as that chain merged with OfficeMax, a deal that closed in 2013.

Combining Staples with Office Depot would essentially condense the industry from three major players to one in just a few years, often the kind of consolidation that raises antitrust concerns. Staples and Office Depot had tried merging only to be blocked by regulators in a 1997 lawsuit.

But some analysts have pointed to the Federal Trade Commission's report on Office Depot and OfficeMax combining as evidence regulators may allow a Staples and Office Depot deal now.

In that ruling, the regulator said much had changed since 1997, particularly the emergence of Amazon.com Inc. and big retailers like Wal-Mart Stores Inc. and Target Corp., which all sell office supplies now.

Starboard has gained attention in recent years as one of the most active activists, taking on companies ranging from paper producers to pasta sellers. It scored a significant victory last year when it unseated the entire board of Darden Restaurants Inc. and named its own founder Jeffrey Smith as chairman.

The New York hedge fund also has a similar campaign ongoing at Yahoo Inc. where it is pushing a deal with AOL Inc., again as it has stakes in both aging Internet companies.

Write to David Benoit at david.benoit@wsj.com

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