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Isaac Mamaysky

Advisor at QuantStreet Capital — Rye, NY

Updated today

Credentials

Series 65

Experience

4 years

Location

Rye, NY

QuantStreet Capital logo

QuantStreet Capital

Supported

Total advisors

2

Clients per advisor

13 Very Low

Avg AUM per client

$7,409,283 Very High

HNW client ratio

73% Very High

About

Isaac Mamaysky is a financial advisor at QuantStreet Capital with a Series 65 designation and four years of industry experience. He has concurrent roles in academia and law, including positions at PACE Law School since 2024 and Potomac Law Group, PLLC since 2019. QuantStreet Capital serves individuals, trusts, retirement plans, businesses, and charitable organizations, offering discretionary separately managed account management, financial planning, consulting, and model-portfolio subscriptions. The firm employs a quantitative asset-allocation strategy driven by a proprietary machine learning model combined with discretionary oversight, providing multi–risk-level portfolios that include ETFs, mutual funds, stocks, options, and derivatives.

Client services

Based on QuantStreet Capital

Financial planning Portfolio management Newsletters or periodicals Educational seminars or workshops Model portfolios

Expertise

Based on QuantStreet Capital

Active portfolio management Factor investing / smart beta

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Fee options

Fixed

Flat fees possible for consulting and speaking engagements; negotiated case-by-case; no current clients.

Percentage

0.30% to 0.80% of AUM (negotiable based on account size, services, complexity)

Project-based

Fees for consulting and speaking engagements negotiated case-by-case; hourly fees possible but no current clients.

Subscriptions

Model portfolio subscription fees range from $1,200 to $31,000 annually (billed quarterly in advance), negotiable based on AUM and services.

Other

Account minimum: $300,000

Location

Rye, NY

Rye NY

Advisors at this office

2

Most active in

New York · Texas

Work history

4 years of industry experience

PACE Law School

2024 - Present • 2 years

White Plains, NY

EBH Capital Management LLC dba Quantstreet Capital

2022 - Present • 4 years

New Rochelle, NY

Albany Law School

2020 - 2024 • 4 years

Albany, NY

Potomac Law Group, PLLC

2019 - Present • 7 years

Rye, NY

CZ Wellness Group, Inc.

2012 - Present • 14 years

Rye, NY

Disclosures

Exclamation point means they have disclosures of this type. Check mark means no disclosures of this type were found.

Business activities & affiliations

Gabriel K

CFP®, CPA

White Plains, NY

Wealth Habits

I’m Gabriel Kaplan, CFP®, CPA, and founder of Wealth Habits, an integrated financial planning and investment management firm. I help busy professionals, tech employees, founders, and business owners make better financial decisions across investments, taxes, equity compensation, retirement, cash flow, and estate planning. My work includes strategies for ISOs, NQSOs, RSUs, retirement plans, tax-efficient investing, business transitions, and major life decisions such as buying a home or preparing for retirement. Before founding Wealth Habits, I worked in asset management, tax, and consulting. I hold an MBA from NYU Stern, a Master’s in Business Taxation from USC, and a BSE from the University of Pennsylvania. As a fee-only advisor, I believe financial advice should be tailored, practical, and always aligned with the client’s best interests.

General retirement planning Passive / index investing Equity compensation tax strategy Pre-IPO planning Tax strategies for small businesses Technology Professional Founder/Business Owner Self-Employed Scientific Professional Artists or Creative Young Families Approaching retirement Widow/Widower

Zachary S

Series 63, Series 65

Cresskill, NJ

IRON Financial LLC

Zachary Sirota is a financial advisor at IRON Financial LLC with five years of industry experience. He previously worked at CAMPAIGN Capital LLC and B. Riley Securities, Inc., and has credentials including Series 63 and Series 65 licenses. IRON Financial LLC provides discretionary portfolio management and financial planning services to individuals, trusts, charities, corporations, and pooled investment vehicles. The firm manages approximately $472 million in assets, employing a combination of fundamental, technical, and quantitative analysis across various equity, fixed-income, and multi-asset strategies.

Concentrated stock management Private / alternative investments Founder/Business Owner Executive
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Deirdre S

CFP®

Mamaroneck, NY

Sparrow Wealth Management

Deirdre Smith is a CFP® professional with experience at Capital Group, Elodie Wealth, and Sparrow Wealth Management, where she has worked since 2025. She is based in Mamaroneck, NY. Sparrow Wealth Management is a registered investment adviser serving individuals and high-net-worth clients with discretionary and non-discretionary investment management and financial planning. The firm’s approach combines asset allocation based on Modern Portfolio Theory and fundamental analysis, blending passive and active investments while incorporating tax considerations and ESG screens upon client request.

Business ownership considerations Cash flow / budgeting College savings (529s, UTMA, etc.)
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Brian L

Series 63, Series 65

Stamford, CT

Euclid Harding, LLC

Brian Lasher is a financial advisor at Euclid Harding, LLC, holding Series 63 and Series 65 credentials with six years of industry experience. Prior to joining Euclid Harding, he worked at CIG Capital Advisors, CIG Asset Management Inc., CIG Securities, and Rueone Investments. He also operates as a sole proprietor providing fixed insurance sales and service. Euclid Harding, LLC is a small independent registered investment adviser serving individuals, families, trusts, estates, charitable organizations, corporations, and other entities. The firm offers financial planning, discretionary portfolio management, and pension consulting, focusing on strategic asset allocation and a broad range of investment instruments.

Wealth management Private / alternative investments Options & derivatives strategies Real estate investing Charitable giving & philanthropy Founder/Business Owner Executive
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John W

CFP®, Series 66

Yonkers, NY

Wieder Financial Corp.

John Wieder is a CFP® and holds a Series 66 license. He is the sole advisor at Wieder Financial Corp. with one year of industry experience. Wieder is also a licensed attorney in New York and owns a title insurance business. He has worked at Nationwide Settlements Solutions since 2008. Wieder Financial Corp. is an independent, state-registered advisory firm serving individual clients through a co-advisory arrangement with a third-party money manager. The firm focuses on broad-based asset categories using funds-of-funds, mutual funds, and ETFs, while portfolio management and trading are handled by the selected money manager.

Wealth management Passive / index investing General retirement planning
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Fabian D

CFP®, CFA®

White Plains, NY

FMD Wealth Advisors LLC

Fabian Degen is a CFP® and CFA® credentialed advisor with one year of industry experience. He is the sole advisor at FMD Wealth Advisors LLC, an independent firm located in White Plains, NY. Prior to founding his firm, he worked for 16 years at DWS Group. In addition to his advisory role, he performs seasonal tax preparation work with H&R Block. FMD Wealth Advisors is a fee-only independent registered investment adviser serving individual and high-net-worth clients. The firm offers wealth management, investment management, and financial planning services, typically utilizing low-cost mutual funds and ETFs within a process that combines fundamental and technical analysis for long-term portfolio construction.

Options & derivatives strategies Divorce financial planning
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