By Ryan Tracy 

WASHINGTON--A group of top financial regulators is considering whether Warren Buffett's Berkshire Hathaway Inc. poses risks to the financial system and should be drawn in for tougher oversight, according to people familiar with the discussions.

The review by the Financial Stability Oversight Council, which is in its initial stages, may not ultimately result in the company being designated as a systemically important financial institution, or SIFI, the people said. But Berkshire, a conglomerate that owns a large reinsurance business as well as other businesses, meets some of the criteria outlined by FSOC for companies that it will consider for tougher federal regulation as a so-called SIFI.

The review comes as the Financial Stability Board, a body of international regulators, is also considering whether to designate any reinsurers as global systemically important financial institutions.

The FSOC, which is headed by Treasury Secretary Jacob Lew, has already designated several insurance companies as "systemically important" including American International Group Inc. and Prudential Financial Inc. It is also in the beginning stages of looking at whether asset management companies such as BlackRock Inc. and Fidelity Investments should be labeled "systemic," according to people familiar with the matter.

Companies labeled "systemic" will be subject to oversight by the Federal Reserve. The Fed hasn't said exactly what that oversight will entail, but it is likely to include regulation of each firm's capital levels, which can affect the returns firms pass on to shareholders through dividends or buybacks. MetLife, Inc., which has disclosed it is in the final stage of FSOC review, is fighting the prospect of Fed oversight, and has suggested stricter capital rules could spur it to exit certain business lines.

The Treasury Department does not comment on specific companies under review and a Treasury spokesman declined to comment on Berkshire.

The U.S. discussions about Berkshire Hathaway were first reported by Bloomberg News.

The FSOC has published the criteria that senior regulators will use to decide whether a nonbank firm should receive further evaluation. A company must have more than $50 billion in total consolidated assets and meet at least one of five of other specific thresholds, including exposure to derivative liabilities, credit-default swaps, or various measures of debt and leverage.

Berkshire disclosed in its most recently quarterly filing with the SEC that its total assets were about $458 billion as of the third quarter of 2013, including $301.7 billion in a category called "insurance and other" businesses. Its derivative liabilities were about $5.8 billion, above the $3.5 billion threshold set by FSOC. The company also had about $31.4 billion in gross notional credit-default swaps outstanding as of Jan. 17, according to the Depository Trust & Clearing Corp. That is above the $30 billion FSOC threshold for that criterion.

To receive the systemic label, Berkshire would also have to meet the definition of a nonbank financial company. The 2010 Dodd-Frank law defined those companies generally as having 85% or more of their consolidated assets in or annual gross revenues coming from financial activities.

It isn't clear if Berkshire would meet that standard. It owns a large insurance business that includes two of the world's largest reinsurers, General Re and Berkshire Hathaway Reinsurance Group. Reinsurers sell insurance to other insurance companies as a way to help them manage risk.

However, insurance has become a smaller component of Berkshire's operating earnings and revenue over the years, as the Omaha, Neb.-based conglomerate has made big acquisitions outside the insurance industry. Analysts estimate insurance will account for less than one-quarter of Berkshire's estimated overall revenue of roughly $180 billion for 2013, with the rest coming from its railroad, manufacturing, retail and other operations. Regulators could also take the view that Berkshire's non-insurance holdings are financial investments rather than businesses it will hold in perpetuity.

"Even if they were designated a SIFI, it wouldn't matter because they have so much cash and so little leverage," said Clifford Gallant, an analyst at Nomura. "I don't think it would be a big deal for Berkshire."

If a company meets the FSOC's quantitative thresholds, it qualifies for a more in-depth review by the regulators and their staff.

The U.S. review comes as the FSB, the international body of regulators, is also analyzing the asset management and reinsurance industries for possible risks to the financial system. The international process for evaluating "systemic" firms has previously raised concerns among some critics in the U.S., who note that some officials who sit on FSOC--including the Fed and the Securities and Exchange Commission--are involved in FSB decisions before the FSOC finishes its own evaluation.

The FSB designated MetLife and Prudential as systemically important before the council of U.S. regulators finished their review. Roy Woodall, a former state insurance regulator who sits on the FSOC as its member with insurance expertise, said last year that the international decision on Prudential had "overtaken" the FSOC process. "While the FSB's action should have no influence, I have come to be concerned that the international and domestic processes may not be entirely separate and distinct," he wrote in disagreeing with the September FSOC decision to label Prudential "systemic."

The FSB has said it would make a decision about reinsurance companies this summer.

Anupreeta Das contributed to this article.

Write to Ryan Tracy at ryan.tracy@wsj.com

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