Castfirm Advisors LLC
Data sourced from SEC public records (and other sources when available). Refreshed weekly • Updated today.
About
Castfirm Advisors LLC provides discretionary portfolio management and one-time financial planning to individual and high-net-worth clients. The firm manages about $30 million for roughly 29 client relationships and offers personalized Investment Policy Statements and ongoing portfolio monitoring.
The firm’s investment approach emphasizes modern portfolio theory and a long-term trading horizon, with a primary focus on equity ETFs alongside mutual funds and fixed income to build diversified portfolios. CAL documents client risk tolerance and uses custodial services through Charles Schwab, with portfolio management fees assessed on an asset-based basis and fixed fees for financial plan delivery.
Distinctive features in the brochure include disclosure that a firm principal is a practicing attorney who may offer legal services outside the advisory relationship, a potential source of conflicts that the firm says it will manage and disclose. Financial planning is delivered as a one-time, fixed-fee engagement (rather than ongoing planning), the firm recently transitioned to SEC registration, and it generally requires clients to custody assets at a specified broker-dealer.
Client services
Expertise
Fee options
$250 to $1,000 fixed fee for financial planning
1.00% annually
Account minimum: $250,000
Main office
See office377 Oak Street, Suite 203
Garden City NY 11530
Advisors at this office
1
Offices (2)
Most active in
Maryland · New York
Disclosures
Exclamation point means they have disclosures of this type. Check mark means no disclosures of this type were found.
Business activities & affiliations
Is active or affiliated with:
Lawyer
They provide legal services, typically billed separately.
Is not active or affiliated with:
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Insurance agent
They sell insurance products and may earn commissions on those sales.
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Broker-dealer / trader
They provide brokerage services and may earn transaction-based compensation in addition to advisory fees.
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Bank
They're affiliated with a bank that may offer its own financial products and services.
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Trust company
They provide trust and estate administration services, typically for separate fees.
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Fund sponsor
They manage or sponsor investment funds and may earn management or performance-based fees if clients invest in them.
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Accountant / CPA / tax prep
They offer tax and accounting services, typically for separate fees.
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Real estate agent
They facilitate real estate transactions and may earn commissions.
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Other specialized services
They may provide services such as pension consulting or municipal advisory work, typically for separate fees.
Advisors at this firm
James R
Series 66
Garden City, NY
Castfirm Advisors LLC
James Rudolph is a financial advisor at Castfirm Advisors LLC with nine years of industry experience. He holds a Series 66 designation and has previously worked at JPMorgan Securities, JPMorgan Chase Bank, CitiBank, and U.S. Trust, Bank of America. Outside of his advisory role, he maintains a law practice. Castfirm Advisors LLC provides discretionary portfolio management and one-time financial planning services to individual and high-net-worth clients, focusing on diversified portfolios built around equity ETFs, mutual funds, and fixed income with a long-term investment horizon.
Derek E
CFA®, Series 63
Kensington, MD
Castfirm Advisors LLC
Derek Elphick is a CFA® charterholder with 10 years of industry experience. He is currently an advisor at Castfirm Advisors LLC, where he has worked since 2026. Prior to this, he spent a decade at The Warner Companies, serving as Chief Investment Officer focused on asset allocation and investment management. Castfirm Advisors LLC provides discretionary portfolio management and one-time financial planning services to individual and high-net-worth clients. The firm emphasizes modern portfolio theory and a long-term investment horizon, primarily utilizing equity ETFs alongside mutual funds and fixed income to build diversified portfolios.
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