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September 9, 2026
Jennifer Piorko Mitchell
Office of the Corporate Secretary
FINRA
1700 K Street, NW
Washington, DC 20006
Re: Regulatory Notice 26-14 – Proposed Changes to Modernize Rule 2210 (Communications with the Public)
Dear Ms. Mitchell:
Jennifer Piorko Mitchell
Office of the Corporate Secretary
FINRA
1700 K Street, NW
Washington, DC 20006
Re: Regulatory Notice 26-15, Modernizing FINRA's Best Execution Guidance
Dear Ms. Mitchell,
I build and validate quantitative models. I am responding to one question in section 1 of the Notice, on best execution after the rescission of Rules 611 and 610(e): whether there is additional data that would be informative to firms in making these determinations. My answer is yes, and it is one field.