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 Beach, Florida.
David is registered as a RR (Registered Representative) and started their career in finance in 2025. David has worked at 4 firms and has passed the Series 99TO, SIE and Series 27 exams.
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 Beach, FL 33139April 17, 2026 - Present
MARATHON TRADING GROUP LLC
Office #1: 100 Matsonford Road, Building 4, Suite 255, Wayne, PA 19087June 25, 2026 - Present
Office #1: 7000 W Palmetto Park Road Suite 503, Boca Raton, FL 33433Office #2: 7000 W Palmetto Park Road Suite 503, Boca Raton, FL 33433
State 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
Disclosures can be potential red flags, including customer disputes, regulatory fines, employer terminations, bankruptcies, judgments, liens, or certain criminal activities.
Check for any disclosures as part of your thorough research when choosing an advisor.
