William S. Mcarthur
Professional summary
William Spencer Mcarthur, who also goes by Spencer Mcarthur, is a registered financial professional currently at COGNITIVE CAPITAL, LLC located in Chicago, Illinois.
William is registered as a RR (Registered Representative) and started their career in finance in 2025. William has worked at 1 firm and has passed the Series 57TO and SIE exams.
Aliases
Other business activities
CRS (Client Relationship Summary) - BD
Click below to view William Spencer Mcarthur's CRS (Customer Relationship Summary).
Certified licenses
Experience
October 2, 2025 - Present
COGNITIVE CAPITAL, LLC
Office #1: 141 W Jackson # 1620, Chicago, IL 60604State 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 57TO
Date: 10/1/2025
Securities Trader ExamFINRA
Current Firm
COGNITIVE CAPITAL, LLC
CRD#: 131272 / SEC#: , 8-66442
Contact information
Documents
Direct owners and executive officers
| Name | Position | CRD# |
|---|---|---|
| ARTHUR S. MARGULIS LIVING TRUST DATED 2/24/1998 | MANAGING MEMBER | |
| MARK AND BETSY CARROLL FAMILY REVOCABLE TRUST | MEMBER | |
| THE M & C BUCKLEY FAMILY REVOCABLE TRUST DATED 10/13/2020 | MEMBER | |
| BUCKLEY, MATTHEW EDWARD | TRADING MANAGER, TRUSTEE | 5130690 |
| CARROLL, MARK WILLIAM | CHIEF COMPLIANCE OFFICER, CHIEF OPERATING OFFICER, TRUSTEE | 5077727 |
| MARGULIS, ARTHUR SIDNEY JR | MANAGING PRINCIPAL, TRUSTEE | 2132364 |
| RIDGES, DAVID BRIAN | CHIEF TECHNOLOGY OFFICER, TRUSTEE | 4662004 |
| THE RIDGES FAMILY 2024 DECLARATION OF TRUST DATED MARCH 1, 2024 | MEMBER |
Disclosures
| Regulatory Event | 1 |
Red Flags
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