BW
Brian W. Williamson
WILLIAM O'NEIL SECURITIES
BOSTON, MA 02110
Some features on this profile are disabled
CRD#: 5779301
BW
Professional summary
Brian Walter Williamson, who also goes by Brian Walter Williamson, is a registered financial professional currently at WILLIAM O'NEIL SECURITIES located in Boston, Massachusetts.
Brian is registered as a RR (Registered Representative) and started their career in finance in 2010. Brian has worked at 4 firms and has passed the Series 63, Series 99TO, SIE, Series 7 and Series 24 exams.
Question & Answer
Are you a "fiduciary"?
No
Aliases
Brian Walter Williamson
Other business activities
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.
CRS (Client Relationship Summary) - BD
Click below to view Brian Walter Williamson's CRS (Customer Relationship Summary).
Certified licenses
Advisors may have various certifications and credentials from different organizations. AdvisorCheck highlights these seven certifications - AIF®, CFP®, ChFC®, CFA, CLU®, CIMA®, CPWA®
NoneExperience
Current
October 15, 2025 - Present
WILLIAM O'NEIL SECURITIES
Office #1: 211 Congress Street 5th Floor Suite B, Boston, MA, 02110BD
CRD#: 894
BOSTON, MA
Past
August 4, 2023 - July 10, 2025
UBS SECURITIES LLC
BD
CRD#: 7654
BOSTON, MA
Past
July 20, 2015 - July 31, 2023
LEVEL MARKETS, LLC
BD
CRD#: 171752
Boston, MA
Past
May 19, 2010 - September 22, 2014
LIQUIDNET, INC.
BD
CRD#: 103987
BOSTON, MA
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 them to offer securities such as stocks, bonds, and mutual funds through a broker-dealer.Visual representation of state registrations
RR
Alabama(10/15/2025)
RR
Alaska(10/15/2025)
RR
Arizona(10/15/2025)
RR
Arkansas(10/15/2025)
RR
California(10/15/2025)
RR
Colorado(10/15/2025)
RR
Connecticut(10/15/2025)
RR
Delaware(10/15/2025)
RR
District of Columbia(10/15/2025)
RR
Florida(10/15/2025)
RR
Georgia(10/15/2025)
RR
Hawaii(10/15/2025)
RR
Idaho(10/15/2025)
RR
Illinois(10/15/2025)
RR
Indiana(10/15/2025)
RR
Iowa(10/15/2025)
RR
Kansas(10/15/2025)
RR
Kentucky(10/15/2025)
RR
Louisiana(10/15/2025)
RR
Maine(10/15/2025)
RR
Maryland(10/15/2025)
RR
Massachusetts(10/15/2025)
RR
Michigan(10/15/2025)
RR
Minnesota(10/15/2025)
RR
Mississippi(10/15/2025)
RR
Missouri(10/15/2025)
RR
Montana(10/15/2025)
RR
Nebraska(10/15/2025)
RR
Nevada(10/15/2025)
RR
New Hampshire(10/15/2025)
RR
New Jersey(10/15/2025)
RR
New Mexico(10/15/2025)
RR
New York(10/15/2025)
RR
North Carolina(10/15/2025)
RR
North Dakota(10/15/2025)
RR
Ohio(10/15/2025)
RR
Oklahoma(10/15/2025)
RR
Oregon(10/15/2025)
RR
Pennsylvania(10/15/2025)
RR
Rhode Island(10/15/2025)
RR
South Carolina(10/15/2025)
RR
South Dakota(10/15/2025)
RR
Tennessee(10/15/2025)
RR
Texas(10/15/2025)
RR
Utah(10/15/2025)
RR
Vermont(10/15/2025)
RR
Virginia(10/15/2025)
RR
Washington(10/15/2025)
RR
West Virginia(10/15/2025)
RR
Wisconsin(10/15/2025)
RR
Wyoming(10/15/2025)
Exams
State Security Law Exam
General Industry/Product Exam
RR
Series 99TO
Date: 1/2/2023
Operations Professional ExaminationGeneral Industry/Product Exam
General Industry/Product Exam
Principal/Supervisory Exam
SRO Registrations
RR
FINRA
SRO Registrations
RR
Investors' Exchange LLC
SRO Registrations
RR
NYSE American LLC
SRO Registrations
RR
NYSE Arca, Inc.
SRO Registrations
RR
Nasdaq Stock Market
Current Firm
WO
WILLIAM O'NEIL SECURITIES
O'NEIL SECURITIES INCORPORATED | WILLIAM O'NEIL SECURITIES INCORPORATED | WILLIAM O'NEIL SECURITIES | WILLIAM O'NEIL & COMPANY, INCORPORATED | WILLIAM O'NEIL & CO., INCORPORATED | WILLIAM O'NEIL & CO. INCORPORATED | O'NEIL SECURITIES, INCORPORATED
CRD#: 894 / SEC#: , 8-11763
BD
Broker-Dealer Firm Regulated by FINRA (Boston district office)
Upgrade to AdvisorCheck Premium
Get A Biweekly Pulse, AutomaticallyReceive biweekly alerts automatically. Stay informed and proactive.
Catch Firm-Level Red Flags SoonerCatch leadership changes and disclosures early, before issues escalate.
See Trends. Not Just SnapshotsMonitor firm stability metrics like AUM and advisor ratios over time.
Contact information
Main Address
211 Congress Street 5th Floor Suite B, Boston, MA, 02110
Mailing Address
211 Congress Street 5th Floor Suite B, Boston, MA, 02110
Phone number
(617) 936-8584
Established
California since 11/07/1963
Firm type
Corporation
Fiscal year end
December
Firm Size
Small
# of Employees
FINRA licenses (51 States and Territories)
Documents
Disclosures
| Regulatory Event | 4 |
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.
Company Information
WILLIAM O'NEIL SECURITIES
CRD#: 894Boston, MA 02110TRUST BUT VERIFY
Monitor Brian Williamson
Get automatic monthly alerts on:Job or Firm Moves
Licensing Changes
Client Complaints
New Red Flags
Contact Information Updates
