Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2025

Earnings Per Share [Abstract]

Schedule of Basic and Diluted Net Loss Per Share

The following table presents the calculation of basic and diluted net loss per share for the period following the IPO (in thousands, except share and per share amounts):

	Period from December 18, 2025 to December 31, 2025
Numerator:
Net loss	$	(23,867)
Net loss attributable to redeemable noncontrolling interest	(21,543)
Net loss attributable to Andersen Group Inc. stockholders, basic	$	(2,324)
Net loss attributable to Andersen Group Inc. stockholders, diluted	$	(23,867)
Denominator:
Weighted average number of shares of Class A common stock outstanding, basic	12,650,000
Effect of dilutive Class X Umbrella Units	98,294,464
Weighted average number of shares of Class A common stock outstanding, diluted	110,944,464
Net loss per share:
Loss per share attributable to Class A common stockholders, basic	$	(0.18)
Loss per share attributable to Class A common stockholders, diluted	$	(0.22)

Schedule of Outstanding Share Totals With a Potentially Dilutive Impact

The effect of the Company’s potentially dilutive securities were not included in the calculation of diluted loss per share as the effect would be anti-dilutive. The following table contains outstanding share totals with a potentially dilutive impact:

	December 31, 2025
RSUs	5,419,378
AT Umbrella LLC LTIP Units	976,563
Total	6,395,941