QuantStreet Capital
Data sourced from SEC public records (and other sources when available). Refreshed weekly • Updated today.
Client AUMClient assets under management
$192,641,359
Clients
26
Advisors
2
of 2 employees
About
QuantStreet Capital serves individuals, trusts, retirement plans, businesses, and charitable organizations and also offers model-portfolio subscriptions and consulting to other financial advisory firms and asset managers. Its services include discretionary separately managed account (SMA) management, financial planning and consulting, model delivery subscriptions, an adviser affiliation option for independent advisers, and occasional educational speaking engagements.
The firm implements a quantitative asset-allocation strategy driven by a proprietary machine learning Model combined with discretionary oversight by the firm’s managing members; it constructs multi–risk-level portfolios and offers Target‑Date Replicating Portfolios as well as tactical model portfolios. Portfolios may include ETFs, mutual funds, single‑company stocks, options and other derivatives, and the firm provides opt‑in AI‑generated news summaries and a monthly newsletter and model reports to clients and subscribers as part of its information flow.
Distinctive features disclosed in the brochure include the firm’s advertising of hypothetical performance and performance results for its models and replicating portfolios, and its explicit work with other investment advisers through model subscriptions and an adviser‑affiliation program. The brochure also notes that one managing member is active in a law practice and the other in academia (creating disclosed potential conflicts and operational considerations), that the firm generally enters separate client orders rather than block aggregations, and that certain SMA strategies may involve derivatives exposure and leverage with related risk disclosures.
Client services
Expertise
Fee options
Flat fees possible for consulting and speaking engagements; negotiated case-by-case; no current clients.
0.30% to 0.80% of AUM (negotiable based on account size, services, complexity)
Fees for consulting and speaking engagements negotiated case-by-case; hourly fees possible but no current clients.
Model portfolio subscription fees range from $1,200 to $31,000 annually (billed quarterly in advance), negotiable based on AUM and services.
Account minimum: $300,000
Main office
Rye NY
Advisors at this office
2
Most active in
New York · Texas
Also doing business as
Ebh Capital Management LLC · Quantstreet Capital
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.
Quick links
Advisors at this firm
Isaac M
Series 65
Rye, NY
QuantStreet Capital
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.
Harry M
Series 63, Series 65
Rye, NY
QuantStreet Capital
Harry Mamaysky is a financial advisor at QuantStreet Capital with five years of industry experience. He holds the Series 63 and Series 65 licenses and has worked at EBH Capital Management LLC since 2021. Mamaysky is also affiliated with Columbia Business School, where he has been involved since 2015. 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 using a proprietary machine learning model combined with discretionary oversight, constructing multi-risk-level portfolios that may include ETFs, mutual funds, stocks, options, and derivatives.
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