Shares of insurance brokerage firm Arthur J. Gallagher (NYSE:AJG) plunged 9.4% as OpenAI released insurance-native tools in its ChatGPT App Library, threatening traditional brokerages. AI apps from Insurify and Tuio enable policy comparison and purchase, potentially displacing human brokers. The stock closed at $217.76, down 9.9% from previous close. Arthur J. Gallagher shares are relatively stable, with only 4 significant moves in the past year. This drop follows a recent 4.7% decline related to Medicare payment rate proposals. The stock is down 14.2% this year, trading 37% below its 52-week high.

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