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Brian Williamson

WILLIAM O'NEIL SECURITIES
BOSTON, MA
·CRD# 5779301·16 years experience

Professional Summary

Brian Williamson, who also goes by Brian Walter Williamson, is a registered financial advisor 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.

At a Glance

Best-Interest Standard

Fiduciary Standard

Fee Structure

Account Minimum

Active Clients

Fiduciary Standard

Fee Structure

Account Minimum

Active Clients

Other Aliases

Brian Walter Williamson

Blog Corner

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Videos & Posts

This advisor has not added any videos or posts yet.

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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

16 years in the financial services industry

Current & Past Employments

WILLIAM O'NEIL SECURITIES·CRD# 894
BD
211 Congress Street 5th Floor Suite B, Boston, MA, 02110
October 15, 2025 - Present
UBS SECURITIES LLC·CRD# 7654
BD
Boston, MA
August 4, 2023 - July 10, 2025
LEVEL MARKETS, LLC·CRD# 171752
BD
Boston, MA
July 20, 2015 - July 31, 2023
LIQUIDNET, INC.·CRD# 103987
BD
Boston, MA
May 19, 2010 - September 22, 2014

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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)

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

FINRA licenses (51 States and Territories)

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

Documents

Direct owners and executive officers

NamePositionCRD#
O'NEIL CAPITAL MANAGEMENT INC.PARENT COMPANY—
ACHEKIAN, TROFINANCE MANAGER, FINOP7864191
JANNETTA, GREGORY SAMUELCHIEF EXECUTIVE OFFICER2557823
MASOTTI, ALEXANDER VICTORGENERAL COUNSEL & CHIEF COMPLIANCE OFFICER6375390

Disclosures

Regulatory Event

4

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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.

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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
(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

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 Jul 2010About the Series 63 exam

Series 99TO — Operations Professional Examination

Passed Jan 2023About the Series 99TO exam

SIE — Securities Industry Essentials Examination

Passed Oct 2018About the SIE exam

Series 7 — General Securities Representative Examination

Passed May 2010About the Series 7 exam

Series 24 — General Securities Principal Examination

Passed Oct 2015About the Series 24 exam
FINRA
SRO Registrations
Investors' Exchange LLC
SRO Registrations
NYSE American LLC
SRO Registrations
NYSE Arca, Inc.
SRO Registrations
Nasdaq Stock Market
SRO Registrations

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CRS (Client Relationship Summary) - BD

Click below to view Brian Williamson's CRS (Customer Relationship Summary).

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