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Regulatory Requirement | 3 Months Ended
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Mar. 31, 2018
Regulatory Capital Requirements [Abstract] |
Regulatory Requirement | Regulatory Requirement As of March 31, 2018 and December 31, 2017, broker-dealer subsidiaries of the Company are subject to the SEC Uniform Net Capital Rule 15c3-1, which requires the maintenance of minimum net capital of $1.0 million for each of the three broker-dealer subsidiaries. Pursuant to NYSE and NYSE MKT (formerly NYSE Amex) rules, Virtu Financial Capital Markets LLC was also required to maintain $3.7 million and $4.1 million of capital in connection with the operation of its designated market maker (“DMM”) business as of March 31, 2018 and December 31, 2017, respectively. The required amount is determined under the exchange rules as the greater of $1 million or 15% of the market value of 60 trading units for each symbol in which the broker-dealer subsidiary is registered as the DMM. The regulatory capital and regulatory capital requirements of these subsidiaries as of March 31, 2018 was as follows:
(in thousands) |  | Regulatory Capital |  | Regulatory Capital Requirement |  | Excess Regulatory Capital
Virtu Americas LLC |  | $ | 411,168 |  |  | $ | 1,000 |  |  | $ | 410,168 |
Virtu Financial BD LLC |  | 88,280 |  |  | 1,000 |  |  | 87,280 |
Virtu Financial Capital Markets LLC |  | 8,563 |  |  | 4,696 |  |  | 3,867 |
The regulatory capital and regulatory capital requirements of these subsidiaries as of December 31, 2017 was as follows:
(in thousands) |  | Regulatory Capital |  | Regulatory Capital Requirement |  | Excess Regulatory Capital
Virtu Americas LLC |  | $ | 379,875 |  |  | $ | 1,000 |  |  | $ | 378,875 |
Virtu Financial BD LLC |  | 40,683 |  |  | 1,000 |  |  | 39,683 |
Virtu Financial Capital Markets LLC |  | 8,308 |  |  | 5,114 |  |  | 3,194 |

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