Isaac Mamaysky
QuantStreet Capital · Rye, New York
Isaac Mamaysky is a fee-only financial advisor at QuantStreet Capital in Rye, New York. Isaac charges a percentage of assets (0.5%–0.8% a year of assets managed).
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Facts
| Firm | QuantStreet Capital |
|---|---|
| Based in | Rye, New York |
| Fee model | Percentage of assets |
| Fees (firm's website) | 0.5%–0.8% a year of assets managed |
| Accepting new clients | Yes |
| Assets under management | $192.6M across 74 accounts |
| SEC registration | Investment adviser representative in NY, TX · CRD 7516102 |
| Exams passed | Series 65 (2022) |
| Firm size | 2 employees |
| Disclosures | None reported |
| Website | www.quantstreetcapital.com |
| Profile |
How Isaac's firm compares
- QuantStreet Capital's average account is about $2.6 million, from its Form ADV (assets managed divided by 74 accounts).
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Questions about Isaac
Is Isaac Mamaysky a fee-only financial advisor?
Yes, according to SEC records as of October 29, 2026: Isaac holds no broker registration, and QuantStreet Capital reports no commissions, no broker-dealer, and no insurance sales or affiliated insurance agency on its Form ADV.
How does Isaac charge for financial advice?
Isaac charges a percentage of assets.
How much does Isaac charge?
According to QuantStreet Capital's website, checked October 30, 2026: 0.5%–0.8% a year of assets managed.
Where is Isaac Mamaysky based?
Isaac Mamaysky is based in Rye, New York.
Is Isaac Mamaysky registered with the SEC?
Yes. Isaac Mamaysky is registered as an investment adviser representative in NY and TX (CRD 7516102), per SEC Investment Adviser Public Disclosure data as of October 29, 2026.
How much does QuantStreet Capital manage?
QuantStreet Capital reports $192.6M across 74 accounts in assets under management.
How do I contact Isaac Mamaysky?
Through Isaac's website, www.quantstreetcapital.com.
What these terms mean: fee-only · fiduciary · CFP · CRD number · all terms
Where this information comes from
- SEC adviser records : the firm's Form ADV reports no commissions, no broker-dealer, and no insurance sales or affiliated insurance agency, and the advisor holds no broker registration
- QuantStreet Capital website : specialties, clients served, and fees, checked October 30, 2026
- SEC Investment Adviser Public Disclosure : registration, exams, and the firm's Form ADV, data as of October 29, 2026
- Directory listing last checked October 30, 2026.
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