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Compensation - Activity Associated with Restricted Stock Units (Details) - Restricted Stock Units - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Newmark Holdings, L.P. |  |  |
Restricted Stock Units |  |  |
Beginning balance (in shares) | 12,133,105 | 11,263,862 |
Number of units, Granted (in shares) | 2,063,848 | 4,192,685 |
Number of Settled units (delivered shares) (in shares) | (1,964,631) | (2,708,902) |
Number of Units, Forfeited units (in shares) | (254,622) | (614,540) |
Ending balance (in shares) | 11,977,700 | 12,133,105 | 11,263,862
Weighted- Average Grant Date Fair Value Per Share |  |  |
Balance at the beginning of period (in dollars per share) | $ 8.59 | $ 9.39 |
Granted (in dollars per share) | 9.52 | 6.82 |
Settled units (delivered shares) (in dollars per share) | 8.69 | 9.03 |
Forfeited units (in dollars per share) | 8.83 | 9.14 |
Balance at the end of period (in dollars per share) | $ 8.73 | $ 8.59 | $ 9.39
Fair Value Amount |  |  |
Balance at beginning of period | $ 104,251 | $ 105,735 |
Granted | 19,647 | 28,594 |
Settled units (delivered shares) | (17,066) | (24,461) |
Forfeited units | (2,248) | (5,617) |
Balance at end of period | $ 104,584 | $ 104,251 | $ 105,735
Weighted- Average Remaining Contractual Term (Years) | 4 years 1 month 24 days | 4 years 3 days | 4 years 9 months
Newmark Holdings, L.P. | Minimum |  |  |
Fair Value Amount |  |  |
Award vesting period | 2 years |  |
Newmark Holdings, L.P. | Maximum |  |  |
Fair Value Amount |  |  |
Award vesting period | 9 years |  |
BGC Holdings, L.P. |  |  |
Restricted Stock Units |  |  |
Beginning balance (in shares) | 4,883 | 6,928 |
Number of units, Granted (in shares) | 19,425 | 0 |
Number of Settled units (delivered shares) (in shares) | (1,243) | (2,045) |
Number of Units, Forfeited units (in shares) | (54) | 0 |
Ending balance (in shares) | 23,011 | 4,883 | 6,928
Weighted- Average Grant Date Fair Value Per Share |  |  |
Balance at the beginning of period (in dollars per share) | $ 4.22 | $ 4.17 |
Granted (in dollars per share) | 6.87 | 0 |
Settled units (delivered shares) (in dollars per share) | 4.28 | 4.05 |
Forfeited units (in dollars per share) | 12.51 | 0 |
Balance at the end of period (in dollars per share) | $ 6.43 | $ 4.22 | $ 4.17
Fair Value Amount |  |  |
Balance at beginning of period | $ 21 | $ 29 |
Granted | 133 | 0 |
Settled units (delivered shares) | (5) | (8) |
Forfeited units | (1) | 0 |
Balance at end of period | $ 148 | $ 21 | $ 29
Weighted- Average Remaining Contractual Term (Years) | 5 years 8 months 15 days | 10 months 13 days | 1 year 7 months 13 days
Award vesting period | 7 years |  |
BGC Holdings, L.P. | Minimum |  |  |
Fair Value Amount |  |  |
Award vesting period | 2 years |  |
BGC Holdings, L.P. | Maximum |  |  |
Fair Value Amount |  |  |
Award vesting period | 3 years |  |

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