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Sinclair Ridley-thomas

SG AMERICAS SECURITIES
Menlo Park, CA
·CRD# 6534591·11 years experience

Professional Summary

Sinclair Ridley-thomas, who also goes by Sinclair Mark Ridley-thomas, is a registered financial advisor currently at SG AMERICAS SECURITIES, LLC located in Menlo Park, California. Sinclair is registered as a RR (Registered Representative) and started their career in finance in 2015. Sinclair has worked at 7 firms and has passed the Series 63, Series 7TO, SIE and Series 79 exams.

At a Glance

Best-Interest Standard

Fiduciary Standard

Fee Structure

Account Minimum

Active Clients

Fiduciary Standard

Fee Structure

Account Minimum

Active Clients

Other Aliases

Sinclair Mark Ridley-Thomas

Blog Corner

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Videos & Posts

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Contact Information

This advisor has not claimed their profile yet, so there is no contact information to display at this time.

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Disclosures are events reported to regulators, such as customer disputes, regulatory actions, employment separations, or financial events. Some are resolved, denied, or contested — a disclosure is not a verdict. We recommend asking an advisor directly about any disclosure on their record.

Disclosures on record.

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.

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Years of Experience

11 years in the financial services industry

Current & Past Employments

SG AMERICAS SECURITIES, LLC·CRD# 128351
BD
2882 Sand Hill Road Suite 118, Menlo Park, CA 94025
December 3, 2025 - Present
WEILD & CO.·CRD# 132398
BD
Boulder, CO
September 3, 2024 - December 2, 2025
LOOP CAPITAL MARKETS LLC·CRD# 43098
BD
San Francisco, CA
May 8, 2024 - September 9, 2024
UBS SECURITIES LLC·CRD# 7654
BD
San Francisco, CA
July 19, 2022 - May 13, 2024
CITIGROUP GLOBAL MARKETS INC.·CRD# 7059
BD
San Francisco, CA
December 23, 2020 - June 22, 2022
RBC CAPITAL MARKETS, LLC·CRD# 31194
BD
San Francisco, CA
July 11, 2017 - October 6, 2020
CITIZENS JMP SECURITIES, LLC·CRD# 22208
BD
San Francisco, CA
November 4, 2015 - July 5, 2017

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Current Firm

SA
SG AMERICAS SECURITIES, LLC

SG AMERICAS SECURITIES, LLC

CRD#: 128351 / SEC#: 8-66125
BD
Broker-Dealer Firm Regulated by FINRA (New York district office)

Contact Information

Main Address

245 Park Avenue, New York, NY 10167

Mailing Address

245 Park Avenue, New York, NY 10167

Phone Number

(212) 278-6000

Established

Delaware since 08/08/2003

Firm Type

Limited Liability Company

Fiscal Year End

December

Firm Size

Large

FINRA licenses (52 States and Territories)

Registered to provide investment advisory services in 0 US states and territories.

Documents

Direct owners and executive officers

NamePositionCRD#
SG AMERICAS SECURITIES HOLDINGS, LLCDIRECT OWNER—
CARTIER, SYLVAINCHIEF EXECUTIVE OFFICER6390499
CULLEN, EDWARD PATRICKCHIEF FINANCIAL OFFICER & FINOPS PRINCIPAL1551615
GERLESITS, WILLIAM RCHIEF COMPLIANCE OFFICER5457051
RUNECKLES, MATTHEW JOHNCHIEF OPERATING OFFICER8275550

Disclosures

Regulatory Event

114

Criminal

1

Arbitration

1

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Other business activities

Information obtained from regulatory filings. Advisors can request corrections through their firm or regulator.

Outside business activity is any business or activity undertaken by an advisor that is outside the scope of their relationship with their firm (e.g., consulting services, real estate, freelance work, teaching, etc.). Investors should stay informed about these activities to ensure no conflicts of interest.

The advisor shows no other business activity.

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State Registrations and Notice Filings

Listed states reflect where the advisor is authorized to serve clients under state regulations.
RR
indicates the advisor is registered as a Registered Representative in this state, allowing securities offerings such as stocks, bonds, and mutual funds through a broker-dealer.
RR
Alabama
(12/3/2025)
RR
Alaska
(12/3/2025)
RR
Arizona
(12/3/2025)
RR
Arkansas
(12/3/2025)
RR
California
(12/3/2025)
RR
Colorado
(12/3/2025)
RR
Connecticut
(12/3/2025)
RR
Delaware
(12/3/2025)
RR
District of Columbia
(12/3/2025)
RR
Florida
(12/3/2025)
RR
Georgia
(12/3/2025)
RR
Hawaii
(12/3/2025)
RR
Idaho
(12/3/2025)
RR
Illinois
(12/3/2025)
RR
Indiana
(12/3/2025)
RR
Iowa
(12/3/2025)
RR
Kansas
(12/3/2025)
RR
Kentucky
(12/3/2025)
RR
Louisiana
(12/3/2025)
RR
Maine
(12/3/2025)
RR
Maryland
(12/3/2025)
RR
Massachusetts
(12/3/2025)
RR
Michigan
(12/3/2025)
RR
Minnesota
(12/3/2025)
RR
Mississippi
(12/3/2025)
RR
Missouri
(12/3/2025)
RR
Montana
(12/3/2025)
RR
Nebraska
(12/3/2025)
RR
Nevada
(12/3/2025)
RR
New Hampshire
(12/3/2025)
RR
New Jersey
(12/3/2025)
RR
New Mexico
(12/3/2025)
RR
New York
(12/3/2025)
RR
North Carolina
(12/3/2025)
RR
North Dakota
(12/3/2025)
RR
Ohio
(12/3/2025)
RR
Oklahoma
(12/3/2025)
RR
Oregon
(12/3/2025)
RR
Pennsylvania
(12/3/2025)
RR
Puerto Rico
(12/3/2025)
RR
Rhode Island
(12/3/2025)
RR
South Carolina
(12/3/2025)
RR
South Dakota
(12/3/2025)
RR
Tennessee
(12/3/2025)
RR
Texas
(12/3/2025)
RR
Utah
(12/3/2025)
RR
Vermont
(12/3/2025)
RR
Virginia
(12/3/2025)
RR
Washington
(12/3/2025)
RR
West Virginia
(12/3/2025)
RR
Wisconsin
(12/3/2025)
RR
Wyoming
(12/3/2025)

Exams

Financial professionals may take different exams throughout their careers based on the types of services they provide and roles they perform.

Series 63 — Uniform Securities Agent State Law Examination

Passed Jan 2016About the Series 63 exam

Series 7TO — General Securities Representative Examination

Passed Jun 2021About the Series 7TO exam

SIE — Securities Industry Essentials Examination

Passed Oct 2018About the SIE exam

Series 79 — Investment Banking Registered Representative Examination

Passed Nov 2015About the Series 79 exam
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SRO Registrations
Nasdaq Texas, LLC
SRO Registrations
New York Stock Exchange
SRO Registrations

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CRS (Client Relationship Summary) - BD

Click below to view Sinclair Ridley-thomas's CRS (Customer Relationship Summary).

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SR
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