also provides that equity capital may not be withdrawn or a cash dividend paid if certain minimum net capital requirements are not met. Cboe Trading computes the net capital requirements under the basic method provided for in Rule 15c3-1.
As of June 30, 2019, Cboe Trading is required to maintain net capital equal to the greater of 6.67% of aggregate indebtedness items, as defined, or $0.1 million. At June 30, 2019, Cboe Trading had net capital of $10.0 million, which was $9.6 million in excess of its required net capital of $0.4 million.
As entities regulated by the FCA, Cboe Europe Limited is subject to the Financial Resource Requirement ("FRR") and Cboe Chi-X Europe is subject to the Capital Resources Requirement ("CRR"). As a RIE, Cboe Europe Limited computes its FRR in accordance with its Financial Risk Assessment, as agreed by the FCA. This FRR was $21.2 million at June 30, 2019. At June 30, 2019, Cboe Europe Limited had capital in excess of its required FRR of $18.7 million.
As a Banks, Investment firms, PRUdential (BIPRU) 50k firm, as defined by the Markets in Financial Instruments Directive of the FCA, Cboe Chi-X Europe computes its CRR as the greater of the base requirement of $0.1 million at June 30, 2019, or the summation of the credit risk, market risk and fixed overheads requirements, as defined. At June 30, 2019, Cboe Chi-X Europe had capital in excess of its required CRR of $0.5 million. Cboe Chi-X Europe Limited is currently dormant having ceased offering its routing service in November 2018.
On March 8, 2019, Cboe Europe B.V. received approval from the Dutch Ministry of Finance to operate a RM, a MTF, and an approved publication arrangement (APA) in the Netherlands. As a RM, Cboe Europe B.V. is subject to minimum capital requirements, as established by the Dutch Ministry of Finance in the license of March 8, 2019. As of June 30, 2019, the minimum capital requirement calculated in accordance with the license was $1.9 million. At June 30, 2019, Cboe Europe B.V. had capital in excess of its requirement of $3.1 million.
As a designated contract market regulated by the CFTC, CFE is required to meet two capital adequacy tests: (i) its financial resources must be equal to at least twelve months of its projected operating costs and (ii) its unencumbered, liquid financial assets, which may include a line of credit, must be equal to at least six months of its projected operating costs. As of June 30, 2019, CFE had annual projected operating expenses of $51.3 million and had financial resources that exceeded this amount. Additionally, as of June 30, 2019, CFE had projected operating expenses for six months of $25.7 million and had unencumbered, liquid financial assets, including a line of credit from Cboe, that exceeded this amount.
As a swap execution facility regulated by the CFTC, Cboe SEF is required to meet two capital adequacy tests: (i) its financial resources must be equal to at least twelve months of its projected operating costs and (ii) its unencumbered, liquid financial assets must be equal to at least six months of its projected operating costs. As of June 30, 2019, Cboe SEF had annual projected operating expenses of $1.0 million and had financial resources that exceeded this amount. Additionally, as of June 30, 2019, Cboe SEF had projected operating expenses for the upcoming six months of $0.5 million and had unencumbered, liquid financial assets that exceeded this amount.
18. STOCK-BASED COMPENSATION
Stock-based compensation is based on the fair value of the award on the date of grant, which is recognized over the related service period, net of actual forfeitures. The service period is the period over which the related service is performed, which is generally the same as the vesting period. Vesting may be accelerated for certain officers and employees as a result of attaining certain age and service based requirements in our long-term incentive plan and award agreements.
The Company recognized stock-based compensation expense of $6.3 million and $10.0 million for the three months ended June 30, 2019 and 2018, respectively, and $11.7 million and $21.0 million for the six months ended June 30, 2019 and 2018, respectively. Stock-based compensation expense is included in compensation and benefits and acquisition-related costs in the condensed consolidated statements of income.