Exhibit 23.1

Independent Registered Public Accounting Firm’s Consent

We consent to the inclusion in this Registration Statement of TradeStation Group, Inc. on Form S-4 of our report dated March 31, 2021, with respect to our audit of the financial statements of Quantum Fintech Acquisition Corporation as of December 31, 2020 and for the period from October 1, 2020 (inception) through December 31, 2020, which report appears in the Prospectus, which is part of this Registration Statement. We also consent to the reference to our Firm under the heading “Experts” in such Prospectus.

/s/ Marcum llp

Marcum llp

New York, NY

December 22, 2021