William Sinclair Cummings
Investment Adviser Representative at J.m. Arbour, LLC
Professional summary
Compiled by AdvisorFinder from public regulatory records. This advisor has not provided a personal biography.
William Sinclair Cummings is an investment adviser representative with J.m. Arbour, LLC in Gardiner, ME, where they have been registered since 2022. They have worked in the securities industry since 2018 and have been registered with 3 firms, including Foundations Investment Advisors LLC and AXA Advisors, LLC. They have passed 5 industry qualification exams, including the Series 65 (investment adviser), Series 66 (combined investment adviser and state securities agent), and Series 7 (general securities representative). They are registered to provide investment advice in Maine.
Office
Advisors at this office: 7
Branch office as filed with FINRA, counting current advisors in the directory who work there.
Registrations & licenses
- Investment adviser:
- Maine
Registration requirements vary by state and service. Contact the advisor's firm to confirm whether they can serve you.
Financial-firm registration history
Registration history as reported to FINRA, most recent first.
Reported employment history
Employment the advisor reported on their SEC/FINRA filings, as of October 8, 2026. It may not be a complete history.
- Rochester Institute of TechnologyMay 2016 – May 2017Rochester, NY
- Rochester Institute of TechnologyAug 2013 – May 2017Rochester, NY
- AXA Advisors, LLCJun 2017 – Apr 2020New York, NY
- TD BANKMay 2020 – Nov 2020Kittery, ME
- Foundations Investment Advisors LLCDec 2020 – Aug 2022Scottsdale, AZ
- J.M. Arbour, LLCMay 2022 – no end date reportedGardiner, ME
Official records & sources
Data as of August 11, 2026 · Source: SEC IAPD & FINRA BrokerCheck
About J.m. Arbour, LLC
These details describe the firm overall. Individual advisors' services, clients, and fees may differ.
Fee arrangements the firm reports
- Percentage of assets under management
- Hourly
- Fixed fee
- $0 to $500,0001.50%
- $500,000 to $1,000,0001.25%
- $1,000,000 to $5,000,0001.00%
- $5,000,000 to $10,000,0000.90%
+1 more tiers on the firm profile
Arrangements the firm reports on its Form ADV; this advisor may not charge every fee listed. Estimated from the firm's Form ADV — individual terms may differ. Not a quote.
Services the firm offers
Comprehensive wealth planning and management, including coordinated strategies developed in collaboration with financial advisers, analysts, statisticians, insurance experts, tax professionals, attorneys, corporate trustees, and security consultants.
Client types the firm serves
Firm assets under management
$100M–$500M
- Firm disclosures (Form ADV)
- No disciplinary history reportedVerify on SEC IAPD
- Advisors listed on AdvisorFinder:
- 9
- Offices listed on AdvisorFinder:
- 2
- Main office:
- Gardiner, ME
- SEC file number:
- 801-124962
Counts reflect AdvisorFinder directory coverage, not necessarily the firm's complete network.
Form ADV data as of March 31, 2026
View full firm profileOther advisors at J.m. Arbour, LLC
8 other advisors in the directory
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This profile was compiled and published by AdvisorFinder as editorial content using publicly available information from the SEC's IAPD database and FINRA BrokerCheck. William Sinclair Cummings has not reviewed, approved, or endorsed this profile and is not responsible for its accuracy. Regulatory records change over time — always verify the current record directly on BrokerCheck or SEC.gov before making any decision. AdvisorFinder may be compensated for referrals generated through this page.
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