Role at Calamos Advisors
- Title on Schedule A
- President and Chief Executive Officer
- Control
- John Koudounis is a control person of Calamos Advisors.
- Ownership
- An individual ownership band is not available in the source record.
- Tenure
- John Koudounis has held the filed role since March 2016.
The firm
Form ADV filed 23 July 2026
Career on record
- Passed Series 24, Series 79TO and Series 52TO · 2023
- Passed SIE · 2018
- Passed Series 9 · 2001
- Passed Series 10 · 2000
- Passed Series 63 and Series 7 · 1988
Registrations and exams
Broker registration; no current adviser registration. John Koudounis has passed 8 qualifying exams.
Examinations
| Exam | Name | Passed |
|---|---|---|
| Series 63 | Uniform Securities Agent State Law Examination | 29 October 1988 |
| Series 24 | General Securities Principal Examination | 2 January 2023 |
| Series 9 | General Securities Sales Supervisor - Options Module Examination | 24 January 2001 |
| Series 10 | General Securities Sales Supervisor - General Module Examination | 7 December 2000 |
| Series 79TO | Investment Banking Registered Representative Examination | 2 January 2023 |
| Series 52TO | Municipal Securities Representative Examination | 2 January 2023 |
| SIE | Securities Industry Essentials Examination | 1 October 2018 |
| Series 7 | General Securities Representative Examination | 19 November 1988 |
- Name
- Uniform Securities Agent State Law Examination
- Name
- General Securities Principal Examination
- Name
- General Securities Sales Supervisor - Options Module Examination
- Name
- General Securities Sales Supervisor - General Module Examination
- Name
- Investment Banking Registered Representative Examination
- Name
- Municipal Securities Representative Examination
- Name
- Securities Industry Essentials Examination
- Name
- General Securities Representative Examination
Individual record
- Full name
- John Spiro Koudounis
- CRD
- 1878118
- Registration status
- Broker registration; no current adviser registration
- Firm bio
- calamos.com
This directory does not report disciplinary history, for any firm or individual, in either direction. The SEC publishes the complete record, including any disciplinary events, and it is the authoritative place to check one. Check this record on adviserinfo.sec.gov
Background
Calamos identifies John Koudounis as its president and chief executive officer. The biography says he joined the firm in 2016 and previously led Mizuho Securities USA and ABN AMRO Americas fixed income. It says he graduated from Brown University with a degree in international diplomacy and foreign affairs and economics. Official Calamos executive biography
Common questions
Where does John Koudounis work?
John Koudounis has been President and Chief Executive Officer of Calamos Advisors LLC since March 2016, and is a control person of the firm.
Does John Koudounis have a current investment-adviser registration?
John Koudounis has a current broker registration and no current investment-adviser registration, as of 17 October 2026.
What exams has John Koudounis passed?
John Koudounis has passed 8 licensing exams: the Series 63, Series 7, Series 10, Series 9, SIE, Series 24, Series 79TO and Series 52TO. The earliest, the Series 63, was passed in October 1988.
Leadership at Calamos Advisors
- Thomas HermanEVP, Chief Financial Officer
- Daniel DufresneEVP, Chief Operating Officer
- Walter KellySVP, Chief Compliance Officer
- John Calamos SR.Founder, Chairman and Global CIO
- Thomas KileySVP, Chief Distribution Officer
- Erik OjalaSVP General Counsel & Secretary