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INVESTMENTS | 3 Months Ended
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Mar. 31, 2021
INVESTMENTS |
INVESTMENTS | 4. INVESTMENTS As of March 31, 2021 and December 31, 2020, the Company’s investments were comprised of the following (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31,
​ |  | 2021 |  | 2020
Equity method investments: | ​ | ​ | ​ | ​ | ​ | ​
Investment in Signal Trading Systems, LLC | ​ | $ | — | ​ | $ | 2.0
Total equity method investments | ​ | ​ | — | ​ | ​ | 2.0
​ | ​ | ​ | ​ | ​ | ​ | ​
Other equity investments: | ​ | ​ | ​ | ​ | ​ | ​
Investment in Eris Exchange Holdings, LLC | ​ | ​ | 20.0 | ​ | ​ | 20.0
Investment in American Financial Exchange, LLC | ​ | ​ | 10.6 | ​ | ​ | 10.6
Investment in Cboe Vest Financial Group, Inc. | ​ | ​ | 2.9 | ​ | ​ | 2.9
Investment in Eris Digital Holdings, LLC | ​ | ​ | 0.8 | ​ | ​ | 0.8
Investment in OCC | ​ | ​ | 0.3 | ​ | ​ | 0.3
Other equity investments | ​ |  | 6.1 | ​ |  | 6.1
Total other equity investments | ​ | ​ | 40.7 | ​ | ​ | 40.7
​ | ​ | ​ | ​ | ​ | ​ | ​
Total investments | ​ | $ | 40.7 | ​ | $ | 42.7
​ Equity Method Investments Equity method investments included investments in Signal Trading Systems, LLC, a 50% joint venture with FlexTrade System, Inc. (“FlexTrade”) to develop and market PULSe, a multi-asset front-end order entry system. In 2020, the Company commenced an initiative to migrate PULSe, and its related activity to Cboe Silexx, LLC, a wholly-owned subsidiary of the Company. PULSe was decommissioned as of December 31, 2020, and the joint venture with FlexTrade was wound down during the first quarter of 2021. The Company concluded that the remaining investment in Signal had no future economic value and the remaining balance was written off as of March 31, 2021. The loss related to the write-off was included within acquisition-related costs in the condensed consolidated statements of income. Other Equity Investments The carrying amount of other equity investments is included in investments in the condensed consolidated balance sheets. The Company accounts for these investments using the measurement alternative given the absence of readily determinable fair values for the respective investments and due to the Company’s inability to exercise significant influence over the investments based upon the respective ownership interests held. As of March 31, 2021, other equity investments primarily reflect a 20% investment in OCC and minority investments in Eris Exchange Holdings, LLC, American Financial Exchange, LLC, and other equity investments.

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