Andersen Group Inc., in connection with its initial public offering, has disclosed the creation of new financial obligations through the issuance of CA Promissory Notes and an HO Promissory Note, each dated as of December 16, 2025. These notes were issued by AT Umbrella LLC to Andersen Aggregator LLC. The agreements formalizing these obligations were previously filed as exhibits to Andersen Group's registration statement and are incorporated by reference in the company's recent SEC filing. The terms of these promissory notes are substantially identical to those described in the registration statement. Further details about the relationships between the parties involved can be found in the company's prospectus under "Certain Relationships and Related Party Transactions."

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