Andersen Group Inc. (NYSE:ANDG), a leading independent provider of tax, valuation and financial advisory services to individuals, family offices, businesses and alternative investment funds in the United States, today announced the closing of an underwritten public offering of 4,927,125 shares of its Class A common stock by certain selling stockholders, which included the exercise in full of the underwriters’ option to purchase an additional 642,668 shares of Class A common stock at a public offering price of $44.00 per share. Gross proceeds to the selling stockholders were approximately $216.8 million, before underwriting discounts and commissions and other offering expenses. Andersen did not sell any shares in the offering and did not receive any proceeds from the sale of shares by the selling stockholders.

Baird, Truist Securities and UBS Investment Bank acted as lead book-running managers and William Blair acted as additional book-running manager.

The offering was made only by means of a prospectus. Copies of the prospectus relating to this offering are available from:

Robert W. Baird & Co. Incorporated, Attention: Syndicate Department, 777 E. Wisconsin Avenue, Milwaukee, Wisconsin 53202; phone: (800) 792-2473; email: syndicate@rwbaird.com;
Truist Securities, Inc., Attention: Equity Capital Markets, 740 Battery Ave SE, 3^rd Floor, Atlanta, Georgia 30339; phone: (800) 685-4786; email: truistsecurities.prospectus@truist.com;
UBS Securities LLC, Attention: Prospectus Department, 11 Madison Avenue, New York, New York 10010; email: ol-prospectus-request@ubs.com.

A registration statement relating to these securities has been filed with the Securities and Exchange Commission ("SEC") and was declared effective on August 19, 2026. This press release does not constitute an offer to sell or a solicitation of an offer to buy these securities, and there shall be no sale of these securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under that state’s or jurisdiction’s securities laws.

About Andersen

Andersen is a leading provider of independent tax, valuation and financial advisory services to individuals, family offices, businesses and alternative investment funds in the United States. Andersen’s differentiated approach to client service is rooted in core values that emphasize stewardship, transparency and the seamless delivery of independent, high-quality service. Worldwide, Andersen’s presence spans more than 180 countries through its global platform of member and collaborating firms delivering tax, legal, valuation and consulting services across more than 1,000 locations with over 3,000 partners and 50,000 professionals.

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Gregory Vistica, Managing Director, Investor Relations

greg.vistica@andersen.com