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Equity-Based Compensation (Tables)
3 Months Ended
Mar. 31, 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 three months ended March 31, 2026:
Number of Units
Outstanding as of December 31, 2025 5,419,378 
Granted — 
Vested — 
Forfeited (258,375)
Outstanding as of March 31, 2026 5,161,003 
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, 2025 976,563 
Granted — 
Exercised — 
Forfeited — 
Outstanding as of March 31, 2026 976,563 
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, 2025 44,745,250 
Granted — 
Vested (232,500)
Forfeited (340,000)
Outstanding as of March 31, 2026 44,172,750 
Schedule of Equity-based Compensation Expense
The table below reflects the total equity-based compensation expense recognized in the consolidated statement of operations for the three months ended March 31, 2026 and 2025 (in thousands):
Three Months Ended March 31,
2026 2025
Cost of services $ 41,226  $ — 
Sales, general and administrative 4,378  — 
Total $ 45,604  $