By Doug Cameron 

Two big Pentagon contractors on Wednesday pledged to continue their stock buyback programs, in part because there is nothing they want to buy.

Northrop Grumman Corp has led the defense industry's buyback charge, and said it is likely to extend the program after retiring a quarter of its shares between 2013 and 2015. General Dynamics Corp. spent more than its free cash flow in the first quarter on stock repurchases.

The Pentagon budget is expected to stabilize after years of decline, giving executives more clarity for long-term planning, but the resumption of large-scale deal activity among defense firms predicted by many bankers and analysts hasn't materialized.

"I'm not thinking about M&A because I'm not seeing anything [to buy]," General Dynamics' Chief Executive Phebe Novakovic said on a post-earnings' call Wednesday.

She isn't alone. Raytheon Co., with recent plans to spend more than $2 billion on cybersecurity assets, remains the outlier among the group of five big U.S. contractors that includes Lockheed Martin Corp. and Boeing Co.

The planned $4.6 billion purchase by Harris Corp of Exelis Inc. and a number of smaller transactions also haven't swayed executives, who have successfully driven productivity to boost margins and earnings despite the drop in revenue, helped in part by the tailwind from new pension rules that reduce their retirement costs.

"It's really weird," said one veteran defense deal maker, noting how contractors have expanded their internal M&A teams. "They're not just twiddling their thumbs."

The big companies have been tidying up their existing portfolios. Ms. Novakovic sparked a clear out of some of the company's earlier acquisitions when she took on the CEO role in 2013, and peers including Boeing and BAE Systems PLC plan to shed assets such as cybersecurity systems that don't gel with other businesses.

There is also still a significant valuation gap between buyers and sellers for many assets, according to bankers and executives, particularly in areas such as cyber or defense electronics where assets are scarce.

However, another reason for the absence of deal activity remains strong operating performance.

"The CEOs are producing," said the deal maker. All of the big five contractors reported forecast-beating first quarter results.

General Dynamics's first quarter profit rose 20%, and though Northrop Grumman reported a 19% decline, most was due to a $500 million pension contribution, and the company also raised its full-year guidance.

Defense executives said on first quarter calls that they were broadly happy with their existing portfolios, and have also suggested analysts and investors may be overplaying the impact of some big upcoming Pentagon awards.

The biggest by far is plans by the U.S. Air Force to spend as much as $90 billion on a new long-range strike bomber, sparking a fierce contest between Northrop Grumman and a team of Boeing and Lockheed.

Wes Bush, Northrop's chief executive, on Wednesday played down widespread speculation that the loser would effectively have to withdraw from a primary role in the combat aircraft business. That would leave Lockheed Martin--the main contractor on the huge F-35 fighter program--as the sole U.S. assembler of combat jets.

Mr. Bush said investors should be careful about assuming that the bomber award would reshape the industry, noting it was among an array of opportunities for Northrop, which unlike Boeing has a large presence on the F-35 program.

A decision on the bomber is expected over the summer, though Pentagon officials and lawmakers have said in recent weeks that this could slip.

General Dynamics shares were recently up 3.2% at $137.75, while Northrop was down 0.3% at $160.04.

Write to Doug Cameron at doug.cameron@wsj.com

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