Chubb has made a preliminary approach to acquire American International Group (AIG), according to people familiar with the matter, in what would be the largest insurance merger in history. The move, if it proceeds, would combine two of the world's biggest property-and-casualty insurers and reshape the competitive landscape of the industry.
The Scale of a Potential Merger
Both companies are giants in their own right. Chubb, based in Zurich, has a market capitalization of about $100 billion, while AIG, headquartered in New York, is valued at roughly $45 billion. A combination would create an insurer with a market value exceeding $140 billion, dwarfing current leaders like Berkshire Hathaway's insurance operations. The deal would be the largest ever in the insurance sector, surpassing the previous record set by the 2016 merger of Chubb itself with ACE Limited, which was valued at about $29 billion.
Regulatory and Integration Hurdles
Such a massive transaction would face intense scrutiny from U.S. and international antitrust regulators. The combined company would control significant market share in commercial insurance, particularly in directors-and-officers liability, cybersecurity coverage, and property reinsurance. Regulators would likely demand divestitures in overlapping business lines. Beyond antitrust, integrating two vast organizations with different corporate cultures, IT systems, and distribution networks poses a major operational challenge. Chubb is known for its underwriting discipline, while AIG has spent years restructuring after a near-collapse during the 2008 financial crisis.
What Comes Next
The approach is preliminary and may not lead to a formal offer. AIG's board and management will need to weigh the strategic rationale against the disruption a takeover would bring. AIG has been focused on improving its underwriting profitability and shedding legacy liabilities, and a deal with Chubb could accelerate that turnaround—or derail it if integration falters. Other large insurers, including Berkshire Hathaway and Allianz, could emerge as competing bidders or as buyers for pieces of the combined company if a deal triggers a breakup. For now, the industry watches for any sign of formal talks or a potential counterbid.
