David S. Proskin
Professional summary
David S Proskin, who also goes by David Samuel Proskin, is a registered financial professional currently at ONE VANDERBILT SECURITIES LLC located in New York, New York and STONELIVING SECURITIES, LLC located in Miami, Florida.
David is registered as a RR (Registered Representative) and started their career in finance in 2025. David has worked at 3 firms and has passed the Series 99TO, SIE and Series 27 exams.
Question & Answer
Aliases
Other business activities
CRS (Client Relationship Summary) - BD
Click below to view David S Proskin's CRS (Customer Relationship Summary).
Certified licenses
Experience
October 31, 2025 - Present
ONE VANDERBILT SECURITIES LLC
Office #1: 1 Vanderbilt Ave 65th Floor, New York, NY 10017April 2, 2026 - Present
STONELIVING SECURITIES, LLC
Office #1: 1680 Michigan Avenue Suite 700, Miami, FL 33139April 17, 2026 - Present
MARATHON TRADING GROUP LLC
Office #1: 100 Matsonford Road, Building 4, Suite 255, Wayne, PA 19087State Registrations and Notice Filings
Listed states reflect where the advisor is authorized to serve clients under state regulations.
Visual representation of state registrations
Exams
Series 99TO
Date: 4/17/2026
Operations Professional ExaminationCboe BZX Exchange, Inc.
Cboe Exchange, Inc.
FINRA
Current Firm
MARATHON TRADING GROUP LLC
CRD#: 165584 / SEC#: , 8-69169
Contact information
Documents
Disclosures
| Regulatory Event | 2 |
Red Flags
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