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Share-Based Compensation Plans - Options (Details) - Tradeweb Markets LLC - Successor - Stock Options - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended
--- | --- | ---
Oct. 31, 2018 | Dec. 31, 2018
Assumption used in the Black-Scholes model |  |
Weighted Average Expected Life (years) |  | 5 years 8 months 12 days
Weighted Average Risk Free Interest Rate |  | 2.94%
Weighted Average Expected Volatility |  | 20.00%
Weighted Average Expected Dividend Yield |  | 4.02%
Share Price |  | $ 25,657
Exercise Price |  | $ 28,594
Number of Options |  |
Outstanding, beginning of period | 0 | 0
Granted |  | 13,025.8
Outstanding, end of period |  | 13,025.8
Weighted Average Grant Date Fair Value of Options |  |
Outstanding, beginning of period | $ 0 | $ 0
Granted |  | 2,569
Outstanding, end of period |  | $ 2,569
Additional disclosures |  |
Intrinsic value, options outstanding, end of period |  | $ 4,741
Weighted Average Exercise Price |  | $ 28,594
Weighted Average Remaining Contractual Life (years) |  | 9 years 9 months 18 days
Recapitalization |  |
Number of Options |  |
Outstanding, beginning of period | 0 | 0
Granted |  | 18,091,793
Outstanding, end of period |  | 18,091,793
Weighted Average Grant Date Fair Value of Options |  |
Outstanding, beginning of period | $ 0.00 | $ 0.00
Granted |  | 1.85
Outstanding, end of period |  | $ 1.85
Additional disclosures |  |
Intrinsic value, options outstanding, end of period |  | $ 4,741
Weighted Average Exercise Price |  | $ 20.59
Weighted Average Remaining Contractual Life (years) |  | 9 years 9 months 18 days
Option Plan |  |
Share-Based Compensation Plans |  |
Shares reserved for future issuance |  | 13,912.7
Vesting period | 10 years |
Exercise period following a change in control |  | 15 days

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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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