Equity Investment	12 Months Ended
Dec. 31, 2018
Equity Investment
Equity Investment	(5) Equity Investment In February 2018, the Company established a venture with Option Technology Solutions LLC (“Optech”) to form Matrix Holding Group (“Matrix”), a derivatives execution and technology business. The operating subsidiaries of Matrix offer derivatives trading technology and execution services to broker dealers, professional traders and select hedge funds. These entities have dedicated sales, client services, operations, and technology staff located in Chicago and New York. The Company contributed the ITG Derivatives entity, including its broker-dealer license and professional trader client base with revenues of $5.3 million during the year ended December 31, 2017, along with certain derivatives-focused software and technology for an initial minority stake of approximately 20%. Optech contributed the management team, a retail-focused trading and analytics platform and capital. The board of directors of Matrix consists of two members appointed by Optech and one member appointed by the Company. Unanimous approval of the full board is required for all significant operating activities, including but not limited to: approval and amendment of annual business plans or operating budgets, establishing an incentive compensation plan, approving significant loans and expenditures, appointment of officers and entering into material agreements. The Company’s initial investment in Matrix was recorded at $2.0 million, representing the fair value of the net assets contributed. This investment included cash and restricted cash of $0.6 million and net non-cash assets of $1.4 million. No gain or loss was recognized upon the closing of this transaction as the book value of the contributed net assets approximated fair value. In December 2018, MH II LLC (“MH II”), a subsidiary of Matrix that owns the operating subsidiaries, received a $5.0 million contribution from a third-party for a 17% interest in that entity, diluting the Company’s indirect minority stake in MH II to approximately 17%. The Company recorded a non-cash gain of $0.6 million on this transaction. The Company’s investment in Matrix was $1.8 million at December 31, 2018. In January 2019, Matrix sold a 34% interest in MH II for $10.0 million. This transaction reduced the Company’s indirect minority stake in MH II to approximately 10% and resulted in a gain of $1.3 million for the Company. The Company’s interest in Matrix is accounted for in the Consolidated Financial Statements using the equity method.

(5) Equity Investment

In February 2018, the Company established a venture with Option Technology Solutions LLC (“Optech”) to form Matrix Holding Group (“Matrix”), a derivatives execution and technology business. The operating subsidiaries of Matrix offer derivatives trading technology and execution services to broker dealers, professional traders and select hedge funds. These entities have dedicated sales, client services, operations, and technology staff located in Chicago and New York.

The Company contributed the ITG Derivatives entity, including its broker-dealer license and professional trader client base with revenues of $5.3 million during the year ended December 31, 2017, along with certain derivatives-focused software and technology for an initial minority stake of approximately 20%. Optech contributed the management team, a retail-focused trading and analytics platform and capital. The board of directors of Matrix consists of two members appointed by Optech and one member appointed by the Company. Unanimous approval of the full board is required for all significant operating activities, including but not limited to: approval and amendment of annual business plans or operating budgets, establishing an incentive compensation plan, approving significant loans and expenditures, appointment of officers and entering into material agreements.

The Company’s initial investment in Matrix was recorded at $2.0 million, representing the fair value of the net assets contributed. This investment included cash and restricted cash of $0.6 million and net non-cash assets of $1.4 million. No gain or loss was recognized upon the closing of this transaction as the book value of the contributed net assets approximated fair value.

In December 2018, MH II LLC (“MH II”), a subsidiary of Matrix that owns the operating subsidiaries, received a $5.0 million contribution from a third-party for a 17% interest in that entity, diluting the Company’s indirect minority stake in MH II to approximately 17%. The Company recorded a non-cash gain of $0.6 million on this transaction. The Company’s investment in Matrix was $1.8 million at December 31, 2018.

In January 2019, Matrix sold a 34% interest in MH II for $10.0 million. This transaction reduced the Company’s indirect minority stake in MH II to approximately 10% and resulted in a gain of $1.3 million for the Company.

The Company’s interest in Matrix is accounted for in the Consolidated Financial Statements using the equity method.