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Equity-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2026
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock Unit
The following table summarizes the information about RSU activity of Andersen Group Inc. during the nine months ended September 30, 2026:
Number of Units
Outstanding as of December 31, 20255,419,378 
Granted61,231 
Vested— 
Forfeited(469,390)
Outstanding as of September 30, 20265,011,219 
Schedule of Outstanding Award, Activity, Excluding Option
The following table summarizes information around AT Umbrella LLC LTIP Units:
Number of Units
Outstanding as of December 31, 2025976,563 
Granted707,823 
Exercised— 
Forfeited(74,218)
Outstanding as of September 30, 20261,610,168 
Schedule of Nonvested Share Activity
The following table summarizes information around Class X Aggregator Units subject to vesting conditions:
Number of Units
Outstanding as of December 31, 202544,745,250 
Granted— 
Vested(372,500)
Forfeited(425,000)
Outstanding as of September 30, 202643,947,750 
Schedule of Equity-based Compensation Expense
The table below reflects the total equity-based compensation expense recognized in the consolidated statements of operations for the three and nine months ended September 30, 2026 and 2025 (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2026202520262025
Cost of services$43,076 $— $125,468 $104,512 
Sales, general and administrative4,430 6,901 15,922 31,948 
Total$47,506 $6,901 $141,390 $136,460