Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the registration statements (Nos. 333-117544, 333-137992, 333-144719, 333-152461, 333-186704, 333-209912, 333-231301, and 333-285071 on Form S-3 and Nos. 333-108332, 333-142262, 333-196413, 333-197773, 333-216538, 333-229807, 333-275357 and 333-287055 on Form S-8) of our reports dated November 25, 2025, with respect to the consolidated financial statements of StoneX Group Inc. and the effectiveness of internal control over financial reporting.

/s/ KPMG LLP

Kansas City, Missouri

November 28, 2025