Exhibit 99.1

FOR IMMEDIATE RELEASE

Contact:

Jennifer McGuffin

VP, Director of Corporate Communications

+1.630.245.1780

media@calamos.com

Calamos Asset Management, Inc. Reports

Second Quarter 2015 Results and Declares Dividend

NAPERVILLE, Ill., July 28, 2015 – Calamos Asset Management, Inc. (NASDAQ: CLMS), representing the public shares outstanding, owns 22.2% of the operating company, Calamos Investments LLC, with the remaining 77.8% privately owned by Calamos Family Partners, Inc. Calamos Asset Management, Inc. (CAM) and Calamos Investments LLC together operate a diversified global investment firm offering equity, fixed income, convertible and alternative strategies, and today reported consolidated results for second quarter 2015 and comparative periods.

Highlights

Non-GAAP diluted earnings per share was $0.21 for the second quarter compared with $0.17 in the previous quarter and $0.22 in the second quarter of 2014.¹ Non-GAAP net income attributable to Calamos Asset Management, Inc. was $3.9 million for the quarter compared with $3.1 million last quarter and $4.2 million in the second quarter of 2014.

GAAP diluted earnings per share was $0.11 for the second quarter of 2015 compared with $0.01 in the previous quarter and $0.17 in the second quarter of 2014. The increase in GAAP diluted earnings per share compared with the previous quarter was primarily the result of closed-end fund launch expenses of $11.5 million, or $0.08 per share, recorded in the previous quarter. Net income attributable to CAM was $2.0 million for the quarter compared with $101,000 last quarter and $3.2 million in the second quarter of 2014.

Assets Under Management² were $24.4 billion at June 30, 2015 compared with $24.5 billion at the end of last quarter and $25.8 billion at June 30, 2014. Net outflows were $122 million for the quarter compared with net inflows of $556 million in the previous quarter and net outflows of $1.1 billion in the second quarter of 2014.

Total revenues for the current quarter were $60.4 million compared with $57.4 million in the previous quarter and $63.0 million in the second quarter a year ago. Non-GAAP operating margin was 23.4% for the second quarter, 17.5% in the previous quarter and 26.4% in the second quarter of 2014. GAAP operating margin was 23.4% for the second quarter, -2.6% in the previous quarter and 26.4% in the second quarter of 2014.

The Board of Directors of CAM declared a regular quarterly dividend of 15 cents per share payable on August 24, 2015 to shareholders of record on August 10, 2015.

The table below highlights certain GAAP and non-GAAP financial measures:

Business Commentary

Overall investment performance continues to improve across a number of key strategies.

We continue to solidify our presence as a manager of non-U.S. growth equity strategies with the ten-year anniversary of our international growth products. We also expanded our product breadth with the recent launch of a global convertible product, which garnered $24.8 million in net inflows during the second quarter.

Our newest closed-end fund, which was launched in March 2015, ended the quarter with $782 million of assets after the addition of leverage.

Calamos Investments LLC repurchased 369,894 shares of CAM’s common stock during the second quarter, for a total cost of $4.5 million.

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Assets Under Management and Flows

Assets Under Management as of June 30, 2015 were $24.4 billion, a decrease of $44 million from the end of the first quarter.

Financial Discussion

Operating Income

Second quarter 2015 revenues of $60.4 million decreased 4% from second quarter 2014 primarily due to a decrease in Average Assets Under Management. Total operating expenses for the second quarter were $46.3 million, a decrease of $112,000 from $46.4 million in the second quarter of 2014, primarily as a result of lower distribution expenses and marketing and sales promotion expenses, partially offset by higher compensation expense. Non-GAAP operating income was $14.1 million for the second quarter compared with $16.6 million in the second quarter of 2014 and non-GAAP operating margin was 23.4% for the second quarter compared with 26.4% for the second quarter of 2014. GAAP operating income and GAAP operating margin for both periods were the same as the respective non-GAAP measures.

Non-Operating Income

GAAP non-operating loss was $29,000 for the second quarter of 2015, as presented in Table B. Non-GAAP non-operating income, net of redeemable non-controlling interest in partnerships,³ was $0.5 million during the second quarter of 2015, as presented in Table B.

Income Taxes

CAM’s effective income tax rate was 38.2% for the second quarter of 2015 compared with 38.4% for the second quarter of 2014, as presented in Table D.

Financial Position

As of June 30, 2015, the corporate investment portfolio was $403.4 million, which included cash, cash equivalents, and investments that were principally comprised of investments in products that the company manages. The corporate investment portfolio is used to provide seed capital for new products, to maintain conservative levels of capital for the company’s regulated subsidiaries and to invest in other corporate strategic initiatives.

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As of June 30, 2015, total long-term debt was $46.0 million and total equity was $401.6 million.

Market Capitalization

As of June 30, 2015, CAM, representing the public shares outstanding, owns 22.2% of the operating company, Calamos Investments LLC, with the remaining 77.8% privately owned by Calamos Family Partners, Inc. Because of our ownership structure, reported market capitalization does not reflect the entire value of the company, but rather only the market capitalization pertaining to CAM’s 22.2% interest, which is publicly traded.

Investor Conference Call

Management will hold an investor conference call at 3:30 p.m. Central Time on Tuesday, July 28, 2015. To access the live call and view management’s presentation, visit the Investor Relations section of the company’s website at www.calamos.com/investors. Alternatively, participants may listen to the live call by dialing 877.876.9177 in the U.S. or Canada (785.424.1666 internationally), then entering conference ID #6517972. A replay of the call will be available for one week following the date of the call by dialing 888.203.1112 in the U.S. or Canada (719.457.0820 internationally), then entering conference ID #6517972. The webcast also will be available on the Investor Relations section of the company’s website at www.calamos.com/investors for at least 90 days following the date of the call.

Calamos Asset Management, Inc. (NASDAQ: CLMS) is a diversified global investment firm offering innovative investment strategies including equity, fixed income, convertible and alternative investments. The firm offers strategies through separately managed portfolios, mutual funds, closed-end funds, private funds, UCITS funds and an exchange traded fund. Clients include major corporations, pension funds, endowments, foundations and individuals, as well as the financial advisors and consultants who serve them. Headquartered in the Chicago metropolitan area, the firm also has offices in London and New York. For more information, visit www.calamos.com.

Forward-Looking Statements & Important Risk Disclosures

From time to time, information or statements provided by us, including those within this news release, may contain certain forward-looking statements relating to future events, future financial performance, strategies, expectations, the competitive environment and regulations. Forward-looking statements are based on information available at the time those statements are made and/or management’s good faith belief as of that time with respect to future events, and are subject to risks and uncertainties that could cause actual performance or results to differ materially from those expressed in or suggested by the forward-looking statements. For a discussion concerning some of these and other risks, uncertainties and other important factors that could affect future results, see “Forward-Looking Information” in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and, where applicable, “Risk Factors” in our annual and quarterly reports filed with the U.S. Securities and Exchange Commission.

Performance data quoted represents past performance, which is no guarantee of future results. Current performance may be lower or higher than the performance quoted. The principal value and return of an investment will fluctuate so that your shares, when redeemed, may be worth more or less than their original cost.

As a result of political or economic instability in foreign countries, there can be special risks associated with investing in foreign securities, including fluctuations in currency exchange rates, increased price volatility and difficulty obtaining information. In addition, emerging markets may present additional risk due to potential for greater economic and political instability in less developed countries.

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Before investing carefully consider the fund’s investment objectives, risks, charges and expenses. Please see the prospectus and summary prospectus containing this and other information at www.calamos.com or call 1.800.582.6959. Read it carefully.

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Calamos Asset Management, Inc.

Consolidated Condensed Statements of Operations

(in thousands, except share data)

(Unaudited)

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Calamos Asset Management, Inc.

Assets Under Management (excluding Assets Under Advisement)

(in millions)

(Unaudited)

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Table A

Calamos Asset Management, Inc.

Reconciliation of GAAP to Non-GAAP Operating Margin and Diluted Earnings per Share

(in thousands, except share data)

(Unaudited)

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Table A – Notes

Calamos Asset Management, Inc.

Notes to Reconciliation of GAAP to Non-GAAP

The company provides investors with certain adjusted, non-GAAP financial measures including non-GAAP operating income, non-GAAP operating margin, non-GAAP net income attributable to CAM and non-GAAP diluted earnings per share. These non-GAAP financial measures are provided to supplement the consolidated financial statements presented on a GAAP basis. These non-GAAP financial measures adjust GAAP financial measures to include the tax benefit from the amortization of deferred taxes on intangible assets and to exclude closed-end fund launch expenses, net of taxes, and CAM’s non-operating income, net of taxes. The company believes these adjustments are appropriate to enhance an overall understanding of operating financial performance, as well as to facilitate comparisons with historical earnings results. These adjustments to the company’s GAAP results are made with the intent of providing investors a more complete understanding of the company’s underlying earnings results and trends and marketplace performance. In addition, these non-GAAP financial measures are among the primary indicators management uses as a basis of managing our business.

The presentation of this additional information is not meant to be considered in isolation or as a substitute for the directly comparable financial measures prepared in accordance with GAAP. Investors should review the reconciliations of the non-GAAP financial measures to their most directly comparable GAAP financial measures as provided in Table A.

Non-GAAP operating income is calculated by adjusting for the closed-end fund launch expenses from GAAP operating income. Non-GAAP operating margin is calculated by dividing non-GAAP operating income by total revenues.

Non-GAAP net income attributable to CAM is calculated by adjusting the following items from GAAP net income attributable to CAM:

(i) amortization of deferred taxes on intangible assets associated with the election under section 754 of the Internal Revenue Code of 1986, as amended (Section 754 election);

(ii) closed-end fund launch expenses, net of taxes; and

(iii) non-operating income, net of taxes.

Non-GAAP diluted earnings per share is calculated by dividing Non-GAAP net income attributable to CAM by diluted weighted average shares outstanding.

The deferred tax assets from the Section 754 election allows for a quarterly reduction of approximately $2.0 million in future income taxes owed by the company through 2019, to the extent that a tax payable exists during the quarter. As a result, this cash savings has accrued solely for the benefit of the shareholders of the company’s common stock. The company believes that adjusting this item from the calculation of the above non-GAAP items can be a useful measure in allowing investors to see the company’s performance. Closed-end fund launch expenses, net of taxes are excluded because revenue associated with these expenses will not fully impact results until future periods. Non-operating income is excluded from the above non-GAAP items as it can distort comparisons between periods. As noted above, the company believes that measures excluding these items are useful in analyzing operating trends and allowing for more comparability between periods, which may be useful to investors.

The company believes that non-GAAP operating income, non-GAAP operating margin, non-GAAP net income attributable to CAM and non-GAAP diluted earnings per share are useful measures of performance and may be useful to investors, because they provide measures of the company’s core business activities adjusting for items that are non-cash and costs that may distort comparisons between periods. These measures are provided in addition to the company’s operating income, operating margin, net income attributable to CAM and diluted earnings per share calculated under GAAP, but are not substitutes for those calculations.

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Table B

Calamos Asset Management, Inc.

Non-Operating Income, Net of Redeemable Non-Controlling Interest in Partnership Investments

(in thousands)

(Unaudited)

Table C

Calamos Asset Management, Inc.

Summary of Corporate Investment Portfolio Returns

(in thousands)

(Unaudited)

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Table D

Calamos Asset Management, Inc.

Effective Income Tax Rate

(in thousands)

(Unaudited)

Source: Calamos Asset Management, Inc.

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