By Robb M. Stewart 

MELBOURNE, Australia--Billionaire investor Warren Buffett doubled down his bet on Asia's insurance market by buying a stake in one of Australia's largest general insurers, in a move that looks set to support the expansion of his own firm's presence in the region.

Berkshire Hathaway Inc. will initially buy 3.7% of Insurance Australia Group Ltd. for 500 million Australian dollars (US$388 million) as part of a 10-year partnership, the Australian company said Tuesday.

The deal gives Mr. Buffett a firmer foothold in Australia's A$11.5 billion general-insurance market while allowing the financier, whose long-term investing success has made him a legend on Wall Street, to leverage Insurance Australia's ambitions to expand in Asia.

"We have worked with IAG for more than 15 years and over that time we've developed a good understanding and respect for their people, what they offer, and the way they do business," Mr. Buffett said of Insurance Australia in a statement.

Berkshire Hathaway is among a number of global firms scrambling to tap Asia's potential for growth in the region's underserved insurance market. Maurice "Hank" Greenberg, a former chief executive officer of American International Group Inc., is also striking deals in the region through his Starr Cos. vehicle, which last year completed the first foreign buyout in China of a state-backed general insurer.

Berkshire Hathaway, which has long been a significant force in U.S. insurance, already has a presence in Asia through Gen Re, its reinsurance unit, which played a role after large-scale flooding in Thailand during 2011, when claims ran into billions of dollars. A more recently launched specialty insurance arm began operating in Hong Kong in January, and in April secured an insurance license to operate in Sydney, where it appointed a former Insurance Australia executive, Frank Costigan, as chief financial and chief operating officer of the local unit.

According to Dealogic, this isn't Berkshire Hathaway's first acquisition in Australia. About three years ago, the conglomerate bought two small companies in the construction sector as well as some oil-and-gas assets. It is, however, Berkshire's Hathaway's largest acquisition by value in the Asia-Pacific region since it bought a controlling stake in Japanese toolmaker Tungaloy Corp. for about US$650 million in 2008, Dealogic said.

"The Asian insurance market has been a big draw for overseas companies given the low penetration of insurance when compared to Western markets and the economic growth in the region," said Sally Yim, a senior credit officer for the Asia-Pacific region at Moody's Investors Service. The deal with Insurance Australia helps Mr. Buffett's firm overcome barriers to entering markets in both Australia and New Zealand, she added.

Insurance Australia said the deal would help reduce volatility in its own earnings and assist with its capital needs. Berkshire Hathaway will buy about 89.8 million new Insurance Australia shares at A$5.57 each, with an option to buy a further 5% of its expanded share base within 24 months. The U.S. conglomerate has agreed not to exceed a 14.9% stake for the initial 10-year period of the agreement.

Berkshire Hathaway will receive 20% of Insurance Australia's gross written premiums, and pay 20% of its claims. It will also reimburse the Australian company for its share of operating costs, and pay a percentage-based fee to access its franchise.

Berkshire Hathaway, which already provides reinsurance cover to Insurance Australia, additionally will sell its local small- and medium-business lines, and personal insurance operations, in exchange for renewal rights to the Australian firm's large corporate property-and-liability-insurance business.

"We believe the partnership is an endorsement of our strategy, the strong franchises we have created in the Asia-Pacific region and an acknowledgment of the complementary capabilities we can bring for our customers," said Brian Schwartz, chairman of Insurance Australia, which is one of the world's largest purchasers of catastrophe reinsurance cover.

Mr. Buffett said the arrangement would fast-track Berkshire's entry into the region, in a statement that drove Insurance Australia's shares up by as much as 6.1% in Sydney, paring the year's losses.

Insurance Australia's core businesses are in Australia and New Zealand, where it competes with the likes of QBE Insurance Group Ltd. and Suncorp Group Ltd. But the company has said it has its sights on Asia. Recently, it obtained an insurance license in Indonesia. Insurance Australia Managing Director and Chief Executive Mike Wilkins said it was now exploring opportunities to join China's nationwide insurance market.

Mr. Wilkins said Tuesday that Insurance Australia was also looking to boost its stake in SBI General, a general-insurance joint venture with State Bank of India, to 49% from 24% before the end of the year, and that it is eager to grow in Thailand and expand a Malaysian joint venture. Berkshire has been pursuing its own expansion in Asia by poaching top executives from rivals, including two senior officers from American International Group's Asian operations.

Write to Robb M. Stewart at robb.stewart@wsj.com

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