By Jacob Bunge and Annie Gasparro 

Hillshire Brands Co. agreed to buy Pinnacle Foods Inc. for $4.3 billion in a bet that mixing hot dogs and frozen cakes with pickles, syrup and salad dressing will add up to a more appetizing business.

The deal, announced on Monday, would create a company with about $6.6 billion in annual revenue and a broad array of brands including Hillshire's namesake lunch meats, Jimmy Dean sausages, Ball Park hot dogs, and Sara Lee frozen desserts plus Pinnacle's Vlasic pickles, Wish-Bone salad dressings, Birds Eye frozen vegetables and Log Cabin syrup. Pinnacle, which is majority owned by investment firm Blackstone Group L.P., estimates 85% of U.S. consumers buy at least one of its products.

"When you combine the two, you open up new growth opportunities that don't exist independently," said Hillshire Chief Executive Sean Connolly. Also, "Pickles go with sandwiches," he quipped in an interview. "They're complementary businesses."

Deal making in the food sector has surged in the past two years as companies contend with a menu of stubborn challenges. The growing clout of giant retailers in the grocery business, especially Wal-Mart Stores Inc., has crimped the pricing power of packaged-food producers. Meanwhile, consumer spending remains soft, and many shoppers are turning to fresher options that they feel are healthier. Packaged-food companies also have responded with efforts to cut overhead by closing inefficient factories and laying off employees.

Food-company deals last year reached $54 billion in total value, 29% higher than 2012's total, according to data provider Dealogic. So far this year, companies have struck deals totaling $28.5 billion.

Many of the recent deals aim to broaden companies' reach into different corners of the supermarket. Post Holdings Inc. last month announced a $2.45 billion deal for Michael Foods Inc., adding eggs and dairy products to its cereal offerings. Hormel Foods Corp., owner of Spam and Dinty Moore stew, last year paid $700 million to buy Skippy peanut butter. Hillshire itself last month bought waffle and cereal company Van's Natural Foods for about $165 million.

Pinnacle's brands give Hillshire even more offerings across meal and snack categories where it hasn't been strong, and a deal could increase its leverage with supermarkets and mass retailers in deciding what products to stock, where they're placed, and what promotions they do.

The deal, expected to close by September, is Hillshire's biggest since the company, formerly known as Sara Lee Corp., spun off its coffee and tea business in 2012 to focus more on U.S. food sales, renaming itself in the process.

Mr. Connolly will retain the CEO position at the combined company, which will keep the Hillshire Brands name and remain based in Chicago. He said Pinnacle CEO Bob Gamgort will leave the company upon completion of the deal.

Pinnacle shareholders will receive $18 in cash and a half share in Hillshire for each Pinnacle share. The companies said the deal valued Pinnacle at $36.02 a share based on Hillshire's average closing price before the announcement, representing an 18% premium over Pinnacle's closing price Friday.

Hillshire shares fell 3% Monday to $35.76, while Pinnacle shares rose 13% to $34.47. The stock moves left the companies with similar market values: Hillshire at $4.4 billion based on Monday's close, and Pinnacle around $4 billion.

Hillshire, whose sales have been flat in recent years, said it is borrowing $4.8 billion for the Pinnacle acquisition, financial strain that will cause it to lose its investment-grade status. Hillshire Chief Financial Officer Maria Henry said it expects to maintain its current annual dividend of 70 cents but will suspend its share-buyback program for approximately two years. She said Hillshire expects to regain an investment-grade rating for its debt within three years.

"This consolidation buys them time, but it doesn't solve the fundamental challenge" for Hillshire of achieving long-term, sustainable growth, said Bill Bishop, a food industry consultant at Brick Meets Click.

Parsippany, N.J.-based Pinnacle has been on its own acquisition spree, and many of its brands have been gaining market share. Blackstone bought it for $2.16 billion in 2007, then added Birds Eye Foods Inc. in 2009 for $1.3 billion and the Wish-Bone salad dressing business, which it bought from Unilever PLC last year. Blackstone, which kept 51% of Pinnacle when it went public last year, will own approximately 16% of Hillshire after the deal closes, and it will have a seat on the combined company's board.

Pinnacle has been persuading consumers to buy more of its higher-margin products, a strategy that paid off last year, with the company reporting a 70% increase in earnings to $89.3 million. Shares of Pinnacle Foods had risen 26% over the past 12 months through Friday's market close.

Hillshire said the combination will immediately benefit earnings, and that it expects to save about $140 million in annual costs by the third year through combining manufacturing operations and reducing staff. Mr. Connolly said it was too early to say whether the company would close specific plants.

Hillshire remains open to buying smaller companies that it can easily fold into its current portfolio, Ms. Henry said on the conference call.

--Ben Fox Rubin and Gillian Tan contributed to this article.

Write to Jacob Bunge at jacob.bunge@wsj.com and Annie Gasparro at annie.gasparro@wsj.com

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