William Platt has been Managing Partner of Momentum Advisors since March 2024, is a control person of the firm and directly owns between 25% and 50% of it.
Momentum Advisors, LLC is a New York, NY firm with $415M under management, 370 clients and 7 advisers across 3 offices, as of its July 2026 filing.
William Platt’s longest registration was 10 years at Momentum Advisors (2015–2025). Before joining Momentum Advisors in 2026, William Platt was registered through American Portfolios Advisors, Inc.
- FartherAlso current– present · under a yearDix Hills, NY · Adviser representative · Firm CRD 302050
- Momentum AdvisorsCurrent– present · under a yearNew York, NY · Adviser representative · Firm CRD 159574
- American Portfolios Advisors, Inc– · 4 yearsHolbrook, NY · Adviser representative · Firm CRD 112697
Investment adviser representative registrations
William Platt is registered as an investment adviser representative in 4 states, as a resident of Texas. Each was approved in April 2026.
- New YorkSince 13 April 2026
- North CarolinaSince 14 April 2026
- TexasResidentSince 13 April 2026
- VirginiaSince 14 April 2026
Examinations
| Exam | Name | Passed |
|---|---|---|
| Series 99TO | Operations Professional Examination | 2 January 2023 |
| SIE | Securities Industry Essentials Examination | Credited |
| Series 7 | General Securities Representative Examination | 12 November 2008 |
| Series 63 | Uniform Securities Agent State Law Examination | 29 August 2002 |
| Series 6 | Investment Company Products/Variable Contracts Representative Examination | 12 August 2002 |
- Name
- Operations Professional Examination
- Name
- Securities Industry Essentials Examination
- Name
- General Securities Representative Examination
- Name
- Uniform Securities Agent State Law Examination
- Name
- Investment Company Products/Variable Contracts Representative Examination
- Full name
- William Henry Platt
- CRD
- 4558339
- Firm
- Momentum Advisors · CRD 159574
- Role
- Managing Partner
- Office
- 1120 Avenue of the Americas, 4th Floor, New York, NY 10036
- Registration
- Investment adviser registration
- In the industry since
- January 2003
- Disciplinary history
- Not yet shown here · SEC record
Where does William Platt work?
William Platt has been Managing Partner of Momentum Advisors, LLC since March 2024, and is a control person of the firm.
Is William Platt a financial advisor?
Yes. William Platt has a current investment-adviser registration in New York, North Carolina, Texas and Virginia, through Momentum Advisors since April 2026.
How many years of experience does William Platt have?
William Platt has 23 years in the financial industry, since January 2003, across 3 adviser firms.
What exams has William Platt passed?
William Platt has passed 4 licensing exams: the Series 6, Series 63, Series 7 and Series 99TO. The earliest, the Series 6, was passed in August 2002. FINRA credited William Platt with the SIE, which began in October 2018.
Where did William Platt work before Momentum Advisors?
Before Momentum Advisors, William Platt was registered through American Portfolios Advisors, Inc, May 2010 to October 2014.
Where is William Platt based?
William Platt’s registered office is in New York, NY.
Is William Platt registered with FINRA?
No. William Platt has no current broker registration.
How can I verify William Platt’s record?
Search CRD 4558339 on the SEC’s adviser search (adviserinfo.sec.gov), which publishes William Platt’s full registration record.
