Clients
Calamos Advisors serves 1,957 clients, 1,372 of them high-net-worth individuals. The average client has about $22 million with the firm, and high-net-worth clients hold 3% of its $43.9 billion in assets.
- High-net-worth individuals1,372 clients3%
- Investment companies74 clients91%
- Insurance companies8 clients2%
- OtherIndividuals, Pension and profit-sharing plans, Charitable organizations, State or municipal government entities, Corporations and other businesses3%
Show client breakdownHide client breakdown
| Client type | Clients | Regulatory AUM | Share | Avg. per client |
|---|---|---|---|---|
| Individuals (other than HNW) | 364 | $369,549,705 | 0.8% | $1.02M |
| High-net-worth individuals | 1,372 | $1,530,765,177 | 3.5% | $1.12M |
| Investment companies | 74 | $39,998,204,898 | 91.1% | $540.5M |
| Pension and profit-sharing plans | 41 | $426,754,688 | 1.0% | $10.4M |
| Charitable organizations | 24 | $75,868,698 | 0.2% | $3.16M |
| State or municipal government entities | 4 | $49,456,713 | 0.1% | $12.4M |
| Insurance companies | 8 | $882,853,702 | 2.0% | $110.4M |
| Corporations and other businesses | 70 | $554,875,152 | 1.3% | $7.93M |
| Total | 1,957 | $43,888,328,733 | 100% | $22.4M |
- Clients
- 364
- Regulatory AUM
- $369,549,705
- Share
- 0.8%
- Avg. per client
- $1.02M
- Clients
- 1,372
- Regulatory AUM
- $1,530,765,177
- Share
- 3.5%
- Avg. per client
- $1.12M
- Clients
- 74
- Regulatory AUM
- $39,998,204,898
- Share
- 91.1%
- Avg. per client
- $540.5M
- Clients
- 41
- Regulatory AUM
- $426,754,688
- Share
- 1.0%
- Avg. per client
- $10.4M
- Clients
- 24
- Regulatory AUM
- $75,868,698
- Share
- 0.2%
- Avg. per client
- $3.16M
- Clients
- 4
- Regulatory AUM
- $49,456,713
- Share
- 0.1%
- Avg. per client
- $12.4M
- Clients
- 8
- Regulatory AUM
- $882,853,702
- Share
- 2.0%
- Avg. per client
- $110.4M
- Clients
- 70
- Regulatory AUM
- $554,875,152
- Share
- 1.3%
- Avg. per client
- $7.93M
Total
- Clients
- 1,957
- Regulatory AUM
- $43,888,328,733
- Share
- 100%
- Avg. per client
- $22.4M
What it does
Calamos Advisors provides portfolio management for individuals and small businesses, portfolio management for investment companies, portfolio management for pooled vehicles and portfolio management for institutions. It is paid through a percentage of assets.
Calamos Advisors provided financial planning to 0 clients last fiscal year and advises 3 private funds.
100.0% of assets ($43.89B across 1,957 accounts) are managed with discretion. $348.4M sits in a wrap fee program the firm both sponsors and manages. 1% of clients are outside the U.S., and 18 clients received advice without assets under management last fiscal year.
What the accounts hold
The filed percentages total 101%. The values below are shown as filed.
- Exchange-traded equity securities
- 56%
- U.S. government/agency bonds
- 8%
- U.S. state and local bonds
- 9%
- Investment grade corporate bonds
- 10%
- Non-investment grade corporate bonds
- 14%
- Securities issued by registered investment companies or business development companies
- 1%
- Securities issued by pooled investment vehicles (other than registered investment companies)
- 1%
- Cash and cash equivalents
- 1%
- Other (*this Includes Nominal Amounts of Less Than A Percentage for Commercial Mortgage-Backed Securities.)
- 1%
Custodians
Calamos Advisors’ client accounts are held mainly at Fidelity, with 4% of managed assets, and U.S. Bank National Association, with 2%. Calamos Advisors has custody of $215.1M for 15 clients.
- FidelityNational Financial Services LLC · Boston, MA · $1.75B4%
- U.S. Bank National AssociationU.S. Bank National Association · Milwaukee, WI · $771.3M2%
- All other custodians$41.36B94%
Ownership and leadership
Calamos Investments LLC owns 75% or more of Calamos Advisors, and John Koudounis is its CEO.
- Owns 75% or more of Calamos Advisors LLC
Calamos Investments LLC
Control person · since October 2004
- Owns 75% or more of Calamos Investments LLC
Calamos Partners LLC
Control person · since July 2016
- Owns 25% to 50% of Calamos Partners LLC
John Koudounis
Control person · since July 2016
Calamos Family Partners, Inc.
Member · Control person · since September 2014
- Owns 75% or more of Calamos Family Partners, Inc.
John P. Calamos, Trustee, Under the John P. Calamos 1985 Trust
Control person · since October 2004
- Owns 75% or more of John P. Calamos, Trustee, Under the John P. Calamos 1985 Trust
John Calamos SR.
Control person · since August 1985
William Takahashi
Manager · Control person · since July 2016
Calamos Asset Management, Inc.
Member · Control person · since October 2004
- Owns 50% to 75% of Calamos Asset Management, Inc.
John P. Calamos Qtip Trust
Control person · since June 2026
Calamos Equity Partners LLC
Member · Control person · since June 2026
Daniel Dufresne
Member · Control person · since June 2026
Leadership
- John KoudounisPresident and Chief Executive Officer
- 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
Staff
- 300 employees
- 114 in advisory functions
- 36 state-registered reps
- 81 broker-dealer reps
- 1 soliciting firm
Reported holdings
Calamos Advisors’ reported 13F holdings total $30.07B across 980 positions, and the ten largest make up 28.4% of it.
- $30.07B
- Reported 13F value
- 980
- Positions
- 28.4%
- In the 10 largest
- +6.5%
- Value vs. prior quarter
- Nvidia Corporation4.7%
- Apple Inc.3.8%
- Calamos ETF TR · Tax Awa Coll ETF3.6%
- Western Digital Corp. · Note 3.000%11/12.7%
- State Str SPDR S&P 500 ETF T · TR UnitPut2.7%
- Microsoft Corp.2.5%
- Alphabet Inc. · Cap Stk CL A2.4%
- Amazon Com Inc.2.4%
- State Str SPDR S&P 500 ETF T · TR UnitCall1.8%
- Broadcom Inc.1.7%
Together, the ten largest are 28.4% of reported value.
A 13F covers only exchange-traded long positions the firm holds with discretion, so this $30.07B is not its $43.89B in regulatory assets and does not represent any individual client's portfolio.
Fees
Calamos Advisors is paid through a percentage of assets under management.
Brochure fee details have not yet been processed for this profile. Find its brochure on the SEC’s site.
Offices and registrations
Besides its headquarters, Calamos Advisors has 6 offices (1 private residence, listed without an address), with 6 listed addresses across 5 states.
Illinois · 2 listed addresses
- 2020 Calamos Court, NapervilleHQ
- 215 North Peoria Street, Chicago
California · 1 listed address
- 555 California Street, San Francisco
New York · 1 listed address
- 50 Rockefeller Plaza, New York
Oregon · 1 listed address
- Portland Usbancorp Tower, 111 SW 5th Ave, Portland
Wisconsin · 1 listed address
- 10850 W. Park Place, Milwaukee
Registration details
- Legal name
- Calamos Advisors LLC
- Headquarters
- 2020 Calamos Court, Naperville, IL 60563-2787
- Phone
- 630-245-7200
- Website
- www.calamos.com
- SEC file
- 801-29688
- Structure
- Delaware LLC
- Fiscal year end
- December
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. See this firm's record on adviserinfo.sec.gov
Common questions
How many clients does Calamos Advisors have?
Calamos Advisors has 1,957 clients and manages $43.9 billion for them, as of July 2026. They include 1,372 high-net-worth individuals, 364 other individuals and 74 investment companies.
Source: Form ADV Part 1A, Items 5.D and 5.F, filed 23 July 2026
What services does Calamos Advisors offer?
Calamos Advisors provides portfolio management for individuals and small businesses, portfolio management for investment companies, portfolio management for pooled vehicles and portfolio management for institutions.
Source: Form ADV Part 1A, Item 5.G, from the SEC's 2 October 2026 data file
Which custodians does Calamos Advisors use?
Calamos Advisors’ separately managed account assets are held at National Financial Services LLC (Boston, MA), with $1,754,825,325 and U.S. Bank National Association (Milwaukee, WI), with $771,338,854. Only custodians holding at least a tenth of those assets are named.
Source: Form ADV Part 1A, Schedule D, Section 5.K.(3), filed 23 July 2026
How many financial advisors does Calamos Advisors have?
Calamos Advisors has 36 investment adviser representatives registered with state securities authorities, out of 300 employees, and 114 perform investment advisory functions. 81 are registered representatives of a broker-dealer and 0 are licensed insurance agents.
Source: Form ADV Part 1A, Items 5.A and 5.B, from the SEC's 2 October 2026 data file
What does Calamos Advisors invest in?
At the end of its last fiscal year, Calamos Advisors’ separately managed accounts held 56% exchange-traded equities, 14% high-yield corporate bonds, 10% investment grade corporate bonds, 9% state and local bonds, 8% U.S. government and agency bonds, 1% registered funds (mutual funds, ETFs, BDCs), 1% pooled vehicles (private funds and similar), 1% cash and equivalents and 1% *this includes nominal amounts of less than a percentage for commercial mortgage-backed securities.. It advises 3 private funds.
Source: Form ADV Part 1A, Items 5.K.(1) and 7.B, from the SEC's 2 October 2026 data file
Who owns Calamos Advisors?
Calamos Advisors is owned through a chain of holding companies by John Calamos SR., John Koudounis and John P. Calamos Qtip Trust. Its direct owner is Calamos Investments LLC (75% or more).
Source: Form ADV Part 1A, Schedules A and B, filed 23 July 2026
How does Calamos Advisors get paid?
Calamos Advisors is paid through a percentage of assets under management. Its Form ADV lists no commissions or performance-based fees among how it is paid.
Source: Form ADV Part 1A, Item 5.E, from the SEC's 2 October 2026 data file