CORPORATE HISTORY Calamos Advisors LLC is an investment adviser registered with the U.S. Securities and Exchange Commission (the “SEC”) effective May 29, 1987 and a wholly owned subsidiary of Calamos Investments LLC (“CILLC”). Calamos Asset Management, Inc. (“CAM”) is the sole manager of Calamos Investments LLC, which owns and manages our operating companies. Unless the context otherwise requires, references to “we,” “us,” “our,” “the firm,” “our company” and “Calamos” refer to Calamos Advisors LLC (“CAL”). Please note our use of the term “registered” throughout this brochure does not imply a certain level of skill or training. The firm’s roots date back to 1977 when John P. Calamos, Sr. began serving clients with an emphasis on investment strategies that sought to maximize the potential of convertible securities to manage risk and build wealth. Our firm, headquartered in Naperville, Illinois, has grown organically and through acquisitions with offices based in New York, San Francisco, Portland, Milwaukee, Chicago and Coral Gables. As of December 31, 2023, approximately 22% of the outstanding interests of CILLC was owned by CAM and the remaining 78% of CILLC was owned by Calamos Partners LLC (“CPL”) and John P. Calamos, Sr. CAM was owned by John P. Calamos, Sr. and John S Koudounis, and CPL was owned by John S. Koudounis and Calamos Family Partners, Inc. (“CFP”). CFP was beneficially owned by members of the Calamos family, including John P. Calamos, Sr. INVESTMENT SERVICES Since the introduction of the firm’s first convertible strategy in 1977, Calamos has continued to expand its product offerings. In 1989, the firm introduced an equity strategy that invests in equity and equity sensitive securities, and in 1990, the firm introduced its U.S. equity growth strategy. In subsequent years, investment offerings expanded to include high yield, alternative, fixed income, enhanced fixed income, international growth equity, global long/short, small-cap, SMID and sustainable equity investment strategies. The firm offers and earns advisory fees on the following types of investment products: open-end mutual funds, closed-end funds, ETFs, interval funds, collective investment trusts (CITs), institutional accounts, separately managed accounts, commingled privately placed funds and offshore funds. CAL also offers the Calamos Global Convertible Fund and the Calamos Growth and Income Fund, each an Undertakings for Collective Investments in Transferable Securities (UCITS), and a series or sub-fund of GemCap Investment Funds (Ireland) PLC umbrella fund for which CAL serves as investment manager. CAL also offers the Calamos Antetokounmpo US Sustainable Equities Fund, a sub-fund of the Calamos Antetokounmpo Global Funds SICAV which qualifies as an UCITS and is organized under the laws of Luxembourg. CGAM has entered into an agreement with CAL to serve as sub-investment manager to the UCITS to provide day-to-day portfolio management services as well as operational infrastructure and administrative support. Products are distributed through Intermediaries, such as investment advisers and broker-dealers both in the U.S. and abroad; Institutional Platforms; and Wealth Management for high net-worth individuals and private foundations. Calamos also provides discretionary investment management services directly to institutional investors. We also serve as a sub-investment adviser to investment companies registered under the Investment Company Act of 1940, as amended (the “1940 Act”). We do not sponsor any “wrap-fee” programs, however Calamos participates in several “wrap-fee” and unified managed accounts (“UMA”) programs (collectively, the “Wrap Programs”), which are sponsored by unaffiliated (third-party) investment advisory and/or brokerage firms (each a “Sponsor” and collectively, the “Sponsors”). We participate as a non-discretionary sub-adviser in Wrap Programs. In these Wrap Programs, a third-party

Sponsor offers our firm’s strategies to its clients. We receive a fee from the third party as an investment adviser in these Wrap Programs. Calamos provides, to third-party investment advisers, Model Portfolios/Portfolio Emulations Services (“Model Portfolio”) for a fee. Model Portfolios contain Calamos’ current investment recommendations based on one of its Form ADV Part 2A – Disclosure Brochure PAGE 5 March 22, 2024 investment strategies and other investment parameters as agreed to between Calamos and a third-party client or program Sponsor for the client’s or Sponsor’s use in advising its clients. Although Calamos provides recommendations, it does not have the authority or responsibility to implement those recommendations for any particular account. Rather, the client or third-party program Sponsor receiving the model and any updates to the model controls all investment decisions and executes the securities transactions on behalf of its own account or for the account of its clients. Therefore, there will likely be differences between these Model Portfolios and the discretionary portfolios managed by the firm for its other clients, including cash availability, investment restrictions, account size, holding limits, tax considerations, trade executions and other factors. As a result, the performance of our discretionary advisory clients and that of the Model Portfolios using the same investment strategies will differ. TAILORED SERVICES For most types of accounts for which Calamos has investment discretion, we allow clients to customize their investments, upon their request, by imposing reasonable investment restrictions on certain securities, industries or sectors. In these cases, the client will provide Calamos with written instructions. These requests are typically received at account inception, but reasonable restrictions may be requested, in writing, at any time thereafter, and must be agreed to by Calamos. OTHER Given the multiple potential services that Calamos may provide to a client including a Fund or Funds in which clients may invest, conflicts of interest will arise. When using multiple Calamos (or affiliate) products and services (e.g., consulting and portfolio management), a client should be aware of the conflicts that may arise, consult its own adviser(s), and satisfy itself that the arrangement is appropriate and in its continuing best interests. Calamos and its affiliates are not required to devote their full-time or attention to managing your assets. We conduct other business and also provide investment counseling services to other clients that can be competitive with the activities provided to you. In advising other accounts, we give advice and make recommendations to such accounts, which can be the same, similar to or different from those rendered to you. Differing compensation arrangements with other clients create incentives for us to favor such other clients. Calamos personnel may have more than one role at the company. Certain portfolio managers also serve as traders or research analysts. Further, certain research analysts offer investment ideas for team-managed products. Personnel with multiple roles may have an incentive to favor certain accounts or responsibilities over others. John P. Calamos, Sr., Founder, Chairman and Global Chief Investment Officer, and his family have controlling interest in the firm. This affiliation creates a conflict of interest between our duty to act in your best interest while acting in the best interest of the firm. The firm has in place policies and procedures to address conflicts of interest or potential conflicts of interest. These policies and procedures are described throughout this brochure and include requirements that Calamos employees act in the best interest of the client. ASSETS UNDER MANAGEMENT As of December 31, 2023, Calamos had approximately $33.7 billion total assets under management.