William Mark Barber
Professional Summary
William Mark Barber, who also goes by Mark Barber, is a registered financial advisor currently at MCSA SECURITIES LLC located in Stamford, Connecticut. William is registered as a RR (Registered Representative) and started their career in finance in 1994. William has worked at 5 firms and has passed the Series 63, Series 99TO, Series 79TO, SIE, Series 7 and Series 24 exams.
At a Glance
Fiduciary Standard
Fee Structure
Account Minimum
Active Clients
Fiduciary Standard
Fee Structure
Account Minimum
Active Clients
Other Aliases
Mark Barber
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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.
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Years of Experience
32 years in the financial services industry
Current & Past Employments
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Current Firm
MCSA SECURITIES LLC
Contact Information
Main Address
2200 Atlantic Street Suite 501, Stamford, CT 06902Mailing Address
2200 Atlantic Street Suite 501, Stamford, CT 06902Phone Number
(203) 989-9700Established
Delaware since 02/19/2025Firm Type
Limited Liability CompanyFiscal Year End
MarchFirm Size
SmallFINRA licenses (3 States and Territories)
Registered to provide investment advisory services in 0 US states and territories.
Documents
Direct owners and executive officers
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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
(11/18/2025)
(5/7/2026)
(11/18/2025)
Exams
Financial professionals may take different exams throughout their careers based on the types of services they provide and roles they perform.
Series 79TO — Investment Banking Registered Representative Examination
Passed Jan 2023About the Series 79TO examSRO Registrations
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CRS (Client Relationship Summary) - BD
Click below to view William Mark Barber's CRS (Customer Relationship Summary).
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