Asset manager · Naperville, IL
Calamos Advisors LLC
SEC-registered investment adviser · CRD 105758 · SEC 801-29688
At a glance
Calamos Advisors LLC is an SEC-registered investment adviser based in Naperville, Illinois, with $43.9 billion in regulatory assets under management as of its Form ADV filed July 23, 2026. Its largest client group by assets is investment companies, and it reports 1,736 individual clients. By Form ADV it is a asset manager, ranked 224th of 3,218 asset managers and 478th of 17,210 SEC-registered advisers by assets.
Main office 630-245-7200calamos.comLinkedInAs filed on Form ADV
- Regulatory AUM
- $44B
- Rank among asset managers
- #224 of 3,218
- Rank among all SEC RIAs
- #478 of 17,210
- Rank in Illinois
- #36 of 684
- Individual clients
- 1,736
- High-net-worth clients
- 1,372
- Accounts
- 1,957
- Discretionary
- 100% of AUM
- Employees
- 300
- Advisory staff
- 114
- Offices
- 7
Owners and executives on its Form ADV
- John P. Calamos Sr.Founder, Chairman and Global CIO
- John S. KoudounisPresident and Chief Executive Officer
- Thomas E. HermanEVP, Chief Financial Officer
- Daniel L. DufresneEVP, Chief Operating Officer
- Erik D. OjalaSVP General Counsel & Secretary
- Thomas P. KileySVP, Chief Distribution Officer
- Walter M. KellySVP, Chief Compliance Officer
Custody and brokerage
Broker-dealer
Hybrid RIA
Calamos Advisors LLC is a hybrid RIA: 81 of its employees are also registered representatives of a broker-dealer. It names an affiliated broker-dealer: Calamos Financial Services LLC.
- Calamos Financial Services LLC ↗CRD 19850
It doesn’t hold client accounts or customer funds itself. Its annual audited report filed with the SEC, February 2026
Its Form ADV brochure (filed March 2026) names Calamos Financial Services as the broker-dealer its advisers are registered with.
alamos supervised persons and related sales personnel are also associated with Calamos Financial Services LLC (“CFS”), an affiliated limited purpose broker-dealer, and in that capacity engage in marketing or selling activities with respect
Who it serves
| Client type | Clients | Regulatory AUM | Share |
|---|---|---|---|
| Investment companies | 74 | $40B | 91% |
| High-net-worth individuals | 1,372 | $1.5B | 3% |
| Insurance companies | 8 | $883M | 2% |
| Corporations or other businesses | 70 | $555M | 1% |
| Pension and profit sharing plans | 41 | $427M | <1% |
| Individuals | 364 | $370M | <1% |
| Charitable organizations | 24 | $76M | <1% |
| State or municipal government entities | 4 | $49M | <1% |
Private funds
Calamos Advisors LLC reports 3 private funds with $215M in gross assets: other private funds (Form ADV Item 7.B).
Disciplinary disclosures
Calamos Advisors LLC reports no disciplinary disclosures in Item 11 of Form ADV. Read the details on the SEC’s adviser search ↗
Services
- Portfolio management for individuals and small businesses
- Portfolio management for investment companies
- Portfolio management for pooled investment vehicles
- Portfolio management for businesses and institutions
How it’s paid
- A percentage of assets under management
Form ADV and brochures on the SEC’s adviser search ↗calamos.com ↗
AtlasMembers
The full record on Calamos Advisors LLC
Ten years of SEC filings, its owners and contacts, and how it stacks up against its peers. Atlas members see all of it.
- Assets, accounts, clients and staff, ten years of filings
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- Growth over one, three and five years
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- Rank against 314 peers of its type and size
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- Owners and executives, with titles and stakes
- 7 namedLocked
- Main office, fax and compliance officer
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- Filing changes this year, with alerts
- 5Locked
Free while Atlas launches: create a free account and confirm your email. Every figure comes from SEC filings.
Background
Questions
How much does Calamos Advisors LLC manage?
Calamos Advisors LLC reports $43.9 billion in regulatory assets under management across 1,957 accounts, 100% of it on a discretionary basis, on its Form ADV filed July 23, 2026.
What kind of firm is Calamos Advisors LLC?
Calamos Advisors LLC is a asset manager by its Form ADV answers. Most of its assets are managed for funds, institutions or other businesses rather than individuals.
Who are Calamos Advisors LLC’s clients?
By assets, its largest client types are investment companies ($40.0 billion, 74 clients); high-net-worth individuals ($1.5 billion, 1,372 clients); insurance companies ($883 million, 8 clients).
Does Calamos Advisors LLC manage private funds?
Yes. It reports 3 private funds with $215 million in gross assets, including other private funds.
Does Calamos Advisors LLC have any disciplinary history?
Calamos Advisors LLC reports no disciplinary disclosures in Item 11 of its Form ADV. Check the SEC’s adviser search for the latest record.
Where these numbers come from
Every figure is Calamos Advisors LLC’s own answer on its latest Form ADV, from the SEC’s registered-adviser list as of October 1, 2026: regulatory assets and accounts (Item 5.F), clients by type (5.D), employees (5.A and 5.B), compensation (5.E) and services (5.G). Custodians come from Schedule D 5.K(3) of its latest filing (2026-07-23), which lists those holding 10% or more of separately managed account assets and the amount at each. “Hybrid” means some employees are also registered representatives of a broker-dealer (Item 5.B(2)); affiliated broker-dealers are the related persons it lists in Item 7.A and Schedule D. Firm type comes from its own answers: broker-dealer firms are registered broker-dealers themselves (Item 6.A); private fund advisers manage mostly private funds (Item 7.B, 5.D); wealth managers manage at least half their assets for individuals (5.D). Ranks compare it by regulatory assets with every SEC-registered adviser and with firms of its type. Figures are as of the firm’s last annual update, so they can lag recent deals and market moves. Regulatory AUM counts assets the firm continuously supervises and can differ from what a firm markets.
Not an endorsement or a recommendation. Before hiring any adviser, read its Form ADV Part 2A brochure and check its record on the SEC’s adviser search. How to check a financial advisor →