# William Brosnan

> William Brosnan is a fee-only financial advisor at MIO Partners in New York, New York. MIO Partners reports charging a percentage of assets, fixed fees and performance-based fees on its Form ADV.

Page: https://find.wellspent.co/advisors/william-brosnan/
Built from SEC adviser records; last checked October 30, 2026.

## Facts

- **Firm:** MIO Partners
- **Based in:** New York, New York
- **Fee model (firm's Form ADV):** Percentage of assets; Fixed fees; Performance-based fees
- **Assets under management (firm):** $59.59B across 75 accounts
- **CRD:** 6351109 (https://adviserinfo.sec.gov/individual/summary/6351109)
- **SEC registration:** Investment adviser representative in NY
- **Exams passed:** Series 63 (2026), Series 65 (2024)
- **Firm size:** 287 employees
- **Disclosures:** None reported
- **Website:** https://www.miopartners.com

## Frequently asked questions

### Is William Brosnan a fee-only financial advisor?

Yes, according to SEC records as of October 29, 2026: William holds no broker registration, and MIO Partners reports no commissions, no broker-dealer, and no insurance sales or affiliated insurance agency on its Form ADV.

### How does William charge for financial advice?

William's firm, MIO Partners, reports charging a percentage of assets, fixed fees and performance-based fees on its SEC Form ADV.

### Where is William Brosnan based?

William Brosnan is based in New York, New York.

### Is William Brosnan registered with the SEC?

Yes. William Brosnan is registered as an investment adviser representative in NY (CRD 6351109), per SEC Investment Adviser Public Disclosure data as of October 29, 2026.

### How much does MIO Partners manage?

MIO Partners reports $59.59B across 75 accounts in assets under management.

### How do I contact William Brosnan?

Through William's website, www.miopartners.com.

## Sources

- SEC adviser records (https://adviserinfo.sec.gov/individual/summary/6351109): 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
- SEC Investment Adviser Public Disclosure and Form ADV: registration, exams, and firm facts, data as of October 29, 2026

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Source: Wellspent, the public graph of fee-only advisors (https://find.wellspent.co). No paid placement.