Career
Daniel Dufresne has been EVP, Chief Operating Officer of Calamos Advisors since April 2021. Daniel Dufresne is a control person of the firm and directly owns under 5% of it. Daniel Dufresne holds a B.S. from Cornell University and an M.B.A. with honors from the University of Chicago Booth School of Business.
Calamos Advisors LLC is a Naperville, IL firm with $43.9B under management, 1,957 clients and 114 advisers across 7 offices, as of its July 2026 filing.
Calamos identifies Dan Dufresne as executive vice president and chief operating officer, leading trading, IT, operations, marketing, and product strategy. He joined in 2021 after 21 years at Citadel, where he held roles including global treasurer and global heads of operations and counterparty strategy.
No adviser firm registrations are on Daniel Dufresne’s record.
Credentials and registrations
Examinations
| Exam | Name | Passed |
|---|---|---|
| Series 99TO | Operations Professional Examination | 2 January 2023 |
| Series 57TO | Securities Trader Exam | 2 January 2023 |
| SIE | Securities Industry Essentials Examination | Credited |
| Series 24 | General Securities Principal Examination | 29 April 2004 |
| Series 7 | General Securities Representative Examination | 23 January 1999 |
- Name
- Operations Professional Examination
- Name
- Securities Trader Exam
- Name
- Securities Industry Essentials Examination
- Name
- General Securities Principal Examination
- Name
- General Securities Representative Examination
Individual record
- Full name
- Daniel Leo Dufresne
- CRD
- 2852606
- Firm bio
- calamos.com
Disciplinary history is not reported here, in either direction. Check the SEC record.
Common questions
Where does Daniel Dufresne work?
Daniel Dufresne has been EVP, Chief Operating Officer of Calamos Advisors LLC since April 2021, and is a control person of the firm.
Does Daniel Dufresne have a current investment-adviser registration?
Daniel Dufresne has a current broker registration and no current investment-adviser registration.
What exams has Daniel Dufresne passed?
Daniel Dufresne has passed 4 licensing exams: the Series 7, Series 24, Series 99TO and Series 57TO. The earliest, the Series 7, was passed in January 1999. FINRA credited Daniel Dufresne with the SIE, which began in October 2018.