By Lisa Beilfuss 

ACE Ltd. agreed to buy fellow property-and-casualty insurer Chubb Corp. for $28.3 billion in cash and stock, making the tie-up one of the biggest deals this year.

Chubb holders will receive $62.93 in cash and 0.6019 shares of ACE, for a total value of about $124.13 a share. The price tag represents a 30% premium over Tuesday's closing price. Chubb shares surged 36% to $129 in premarket trading. ACE shares jumped 12% to $113.76.

The companies expect to complete the deal during the first quarter of next year.

In Chubb, ACE gets one of the most well-known brand names in the property-and-casualty insurance industry, as its Masterpiece homeowners coverage is the choice of wealthy Americans to protect their houses.

ACE shareholders will own 70% of the new company, which will operate under the Chubb name globally. Evan Greenberg, the chief executive of ACE, will lead the combined company. Chubb CEO John Finnegan will serve as executive vice chairman for external affairs of North America and will assist with the integration.

Mr. Greenberg appears to be following in the footsteps of his father, Maurice R. "Hank" Greenberg, who built his own insurance empire as the long-time chairman and chief executive of American International Group Inc.

Evan Greenberg abruptly left AIG in 2000 as the heir apparent to his father after a 25-year career there and joined ACE as CEO the following year. His father, meanwhile, is currently fighting the U.S. government over the terms of AIG's 2008 bailout.

By the third quarter post-closing, ACE said it would realize annual expense savings of about $650 million pretax. The deal will immediately add to earnings and book value.

Four independent directors from Chubb's board will be added to the combined entity's board, the companies said.

Zurich-based ACE has made a series of smaller deals over the past year, buying with a local partner bought most of Thailand-based Siam Commercial Samaggi Insurance PCL last year, along with a property and casualty business from Brazil's Itau Unibanco Holding SA and certain Fireman's Fund operations from Allianz SE.

For its part, Chubb is one of the biggest personal-lines and business insurers in the U.S. Last year, the New Jersey company reported a profit of $2.5 billion on $12.6 billion in sales. Its conservative underwriting and investment approach enabled it to weather the 2008 financial crisis with little damage to its balance sheet.

Merger and acquisition activity has been on fire this year, as companies gain more confidence about the economy, use stockpiles of cash to reach for future growth and get boosts from low interest rates and the surging stock market. Ace's bid for Chubb lands the deal near the top of the heap, adding to the more than $2 trillion in M&A deals or offers unveiled globally so far this year.

Write to Lisa Beilfuss at lisa.beilfuss@wsj.com

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