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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Operating income (loss):    
Unrealized gain (loss) on investment securities, net (from our licensed broker dealer) (Notes 1 and 2) $ (747,268) $ 54,779
Other operating income 86,879 62,212
Total operating income (loss), net (660,389) 116,991
General and administrative costs:    
Compensation 4,892,675 872,027
Operating expense, related party 320,292 301,702
Professional fees 919,089 604,662
Information technology 205,991 147,407
Clearing and other charges 2,036 10,754
General and administrative-other 669,126 304,079
Total general and administrative costs 7,009,209 2,240,631
Research and development costs, net of grants amounting to $708,700 and $793,540 277,582 31,592
Total operating costs 7,286,791 2,272,223
Net operating loss (7,947,180) (2,155,232)
Other income:    
Interest income 337,852 187,291
Net loss before income taxes (7,609,328) (1,967,941)
Income taxes
Net loss (7,609,328) (1,967,941)
Less net loss attributable to non-controlling interests (393,903) (94,193)
Net loss attributable to MDB Capital Holdings, LLC $ (7,215,425) $ (1,873,748)
Common Class A [Member]    
Loss per share attributable to MDB Capital Holdings, LLC:    
Net loss per common share - basic $ (0.78) $ (0.25)
Net loss per common share - diluted $ (0.78) $ (0.25)
Weighted average of common shares outstanding - basic 4,295,632 2,628,966
Weighted average of common shares outstanding - diluted 4,295,632 2,628,966
Common Class B [Member]    
Loss per share attributable to MDB Capital Holdings, LLC:    
Net loss per common share - basic $ (0.78) $ (0.25)
Net loss per common share - diluted $ (0.78) $ (0.25)
Weighted average of common shares outstanding - basic 5,000,000 5,000,000
Weighted average of common shares outstanding - diluted 5,000,000 5,000,000