Exhibit 99.1

JANUS CAPITAL GROUP INC. ANNOUNCES

SECOND QUARTER 2013 RESULTS

DENVER — Janus Capital Group Inc. (“JCG”) (NYSE: JNS) today reported second quarter net income of $15.8 million, or $0.08 per diluted share, compared with first quarter 2013 net income of $28.0 million, or $0.15 per diluted share, and net income of $23.4 million, or $0.13 per diluted share, in the second quarter 2012. Second quarter 2013 included a charge of $0.04 per share from the early extinguishment of debt associated with the exchange of $110.0 million of JCG’s 3.25% convertible senior notes due 2014 for $116.6 million of newly issued 0.75% convertible senior notes due 2018 and a charge of $0.02 per share (or a $0.04 per share decline quarter over quarter) primarily due to the mark-to-market impact on our seed capital program.

Flows and Assets Under Management

Average assets under management during the second quarter 2013 were $164.2 billion compared with $161.8 billion during the first quarter 2013 and $155.0 billion during the second quarter 2012.

At June 30, 2013, JCG’s total assets under management were $160.6 billion compared with $163.8 billion at March 31, 2013 and $152.4 billion at June 30, 2012.

The decrease in complex-wide assets during the second quarter 2013 reflects long-term net outflows of $5.4 billion offset by net market appreciation of $2.2 billion. Fundamental equity and mathematical equity long-term net outflows totaled $4.3 billion and $1.2 billion, respectively, while fixed income long-term net inflows totaled $0.1 billion.

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Investment Performance

As of June 30, 2013, 50% of complex-wide mutual funds had a 4- or 5-star Overall Morningstar RatingTM.(1)

As of June 30, 2013, 45%, 37% and 40% of fundamental equity mutual fund assets ranked in the top half of their Morningstar categories on a one-, three- and five-year total return basis, respectively.(2)

Fixed income mutual funds continue to generate strong long-term relative investment performance with 54%, 100% and 100% of mutual fund assets ranked in the top half of their Morningstar categories on a one-, three- and five-year total return basis as of June 30, 2013.(3)

Mathematical equity relative investment performance declined, with 33%, 57% and 55% of strategies surpassing their respective benchmarks, net of fees, over the one-, three- and five-year periods, respectively, as of June 30, 2013.(4)

(1) For the period ending June 30, 2013, 43%, 44% and 67% of complex-wide mutual funds had a 4- or 5-star Morningstar rating for the 3-, 5- and 10-year periods based on risk-adjusted returns for 40, 39 and 30 funds, respectively. 40 funds were included in the analysis for the Overall period.

(2) References Morningstar relative performance on an asset-weighted basis. For the 10-year period ending June 30, 2013, 82% of the fundamental equity mutual fund assets outperformed the majority of their Morningstar peers based on total returns. For the 1-, 3-, 5- and 10-year periods ending June 30, 2013, 50%, 44%, 58% and 83% of the 40, 32, 31 and 24 fundamental equity mutual funds outperformed the majority of their Morningstar peers based on total returns.

(3) References Morningstar relative performance on an asset-weighted basis. For the 10-year period ending June 30, 2013, 100% of the fixed income mutual fund assets outperformed the majority of their Morningstar peers based on total returns. For the 1-, 3-, 5- and 10-year periods ending June 30, 2013, 33%, 100%, 100% and 100% of the 6, 4, 4 and 4 fixed income mutual funds outperformed the majority of their Morningstar peers based on total returns.

(4) For the period ending June 30, 2013, 60%, 75%, 50% and 67% of the mathematical equity mutual funds were beating their benchmarks on a 1-, 3-, 5-year and since-fund inception basis. Funds included in the analysis and their inception dates are: INTECH U.S. Growth Fund — Class S (1/03); INTECH U.S. Core Fund — Class T (2/03); INTECH U.S. Value Fund — Class I (12/05); INTECH International Fund — Class I (5/07); INTECH Global Dividend Fund — Class I (12/11) and Janus INTECH U.S. Low Volatility Portfolio — Service Shares (9/12).

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Financial Discussion

Financial Highlights

(dollars in millions, except per share data or as noted)

Second quarter 2013 revenues of $215.8 million increased from first quarter 2013, primarily due to higher investment management fee revenue, partially offset by lower private account performance fees. Second quarter 2013 operating expenses of $157.4 million decreased $2.1 million, or 1.3%, from first quarter 2013, primarily due to lower long-term incentive compensation expenses.

Capital and Liquidity

At June 30, 2013, JCG had stockholders’ equity of $1.5 billion, cash and investments of $759.9 million and outstanding debt of $549.4 million.

Cash flows from operations during the second quarter 2013 were $67.0 million compared with $(13.3) million during the first quarter 2013 and $71.1 million during the second quarter 2012. The change in cash flows from operations comparing second quarter 2013 to first quarter 2013 is due to payment of annual incentive compensation in the first quarter 2013.

As referenced above, on June 13, 2013, JCG entered into separate privately negotiated exchange agreements pursuant to which $110.0 million aggregate principal amount of the existing, 3.25% convertible senior notes due 2014 were exchanged for $116.6 million aggregate principal amount of newly issued, 0.75% convertible senior notes due 2018. JCG recognized a $12.6 million loss on extinguishment of debt as a result of the exchange. The exchange takes advantage of favorable conditions in the marketplace and allows JCG to reduce its annual interest expense, extend the

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existing debt maturities and increase its financial flexibility. The additional financial flexibility provided by the transaction may allow JCG to retire additional existing, long-term debt obligations should the opportunity arise in the future.

As part of its capital management, JCG repurchased 1,036,934 shares of its common stock at an average price of $8.74 per share and a total cost of $9.1 million during the second quarter 2013.

On July 22, 2013, JCG’s Board of Directors declared a regular quarterly cash dividend of $0.07 per share. The quarterly dividend will be paid on August 23, 2013, to stockholders of record at the close of business on August 9, 2013.

Executive Team Changes

JCG is also announcing today that Chief Financial Officer (“CFO”) Bruce Koepfgen will be promoted to a newly established role as President of JCG. Replacing Mr. Koepfgen as CFO will be Jennifer J. McPeek, who is currently Senior Vice President and Treasurer and has been with the firm since 2009. Both promotions will be effective August 1, 2013.

In his new role as President, Mr. Koepfgen will focus on business leadership. “Bruce is a very talented and proven leader, with more than 37 years of experience in the financial services and asset management industry, and is a terrific person. I look forward to getting him more deeply involved in driving our global business forward,” said Richard M. Weil, Chief Executive Officer of JCG. “Ms. McPeek has proven her excellence in the financial and strategy duties. I am very confident that she will do an outstanding job as our new CFO.”

Ms. McPeek, age 43, has 21 years of corporate finance and strategy experience. Prior to joining JCG in late-2009, she was Senior Vice President of Strategic Planning at ING Investment Management — Americas Region. Ms. McPeek earned a bachelor of arts degree in mathematics from Duke University, magna cum laude, a master of science degree in Financial Engineering from the Massachusetts Institute of Technology and holds the Chartered Financial Analyst designation.

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Second Quarter 2013 Earnings Call Information

JCG will discuss its results during a conference call on Thursday, July 25, 2013, at 10 a.m. Eastern Daylight Time. The call-in number will be (888) 397-5338. Anyone outside the U.S. or Canada should call (719) 325-2145. The slides used during the presentation will be available in the investor relations section of the JCG website (http://ir.janus.com). For those unable to join the conference call at the scheduled time, an audio replay will be available on www.janus.com/ir.

About Janus Capital Group Inc.

Janus Capital Group Inc. (JCG) is a global investment firm dedicated to delivering better outcomes for clients through differentiated investment solutions from three independent managers: Janus Capital Management LLC (Janus), INTECH Investment Management LLC (INTECH) and Perkins Investment Management LLC (Perkins). Each manager brings a distinct perspective, style-specific expertise and a disciplined approach to risk. JCG’s multi-boutique approach provides clients with distinctive solutions across a broad range of asset classes including equities, fixed income, alternatives, asset allocation and income products.

At the end of June 2013, JCG managed approximately $160.6 billion in assets for shareholders, clients and institutions around the globe. Based in Denver, JCG also has offices in London, Milan, Munich, Singapore, Hong Kong, Tokyo, Melbourne, Paris, The Hague, Zurich, Frankfurt, Dubai and Taipei.

Contact:

John Groneman, (303)-336-7466

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JANUS CAPITAL GROUP INC.

UNAUDITED

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(dollars in millions, except per share data or as noted)

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JANUS CAPITAL GROUP INC.

UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS

(dollars in millions)

UNAUDITED CONDENSED CASH FLOW INFORMATION

(dollars in millions)

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JANUS CAPITAL GROUP INC.

ASSETS & FLOWS BY INVESTMENT DISCIPLINE

(dollars in billions)

Notes:

(1)         Growth/core and fixed income assets reflect a 50%/50% split of the Janus Balanced Fund between the two categories.

(2)         Represents all assets managed by INTECH Investment Management LLC.

(3)         Represents all assets managed by Perkins Investment Management LLC.

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Data presented reflects past performance, which is no guarantee of future results. Due to market volatility, current performance may be higher or lower than the performance shown. Call 877.33JANUS (52687) or visit janus.com/advisor/mutual-funds for performance, rankings and ratings current to the most recent month-end.

Janus Capital Group Inc. (“JCG”) provides investment advisory services through its primary subsidiaries, Janus Capital Management LLC (“Janus”), INTECH Investment Management LLC (“INTECH”) and Perkins Investment Management LLC (“Perkins”).

“Complex-Wide Mutual Funds” means all affiliated mutual funds managed by Janus, INTECH and Perkins. “Fundamental Equity Mutual Funds” means all mutual funds managed by Janus or Perkins that invest in equity securities. “Fixed Income Mutual Funds” means all mutual funds managed by Janus that invest primarily in fixed income securities. “Mathematical Equity Strategies” means all discretionary managed accounts (not mutual funds) that are advised or sub-advised by INTECH. INTECH strategies included in the analysis are those with at least a one-year track record.

Mutual fund relative performance analysis shown is for each Fund’s initial share class: Class T, S or I Shares in the Janus retail fund (“JIF”) trust and the Institutional or Service Shares in the Janus Aspen Series (“JAS”). These share classes may not be eligible for purchase by all investors. Other share classes may have higher sales and management fees, which can result in differences in performance.

Investing involves risk, including the possible loss of principal. The value of your investment will fluctuate over time and you may gain or lose money. A fund’s performance may be affected by risks that include those associated with non-diversification, non-investment grade debt securities, high-yield/high-risk securities, undervalued or overlooked companies, investments in specific industries or countries and potential conflicts of interest. Additional risks to funds may include those associated with investing in foreign securities, emerging markets, initial public offerings, real estate investment trusts (“REITs”), derivatives, short sales, commodity linked investments and companies with relatively small market capitalizations. Each fund has different risks. Please see a Janus prospectus for more information about risks, fund holdings and other details.

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The Overall Morningstar RatingTM for a fund is derived from a weighted-average of the performance figures associated with its three-, five- and ten-year (if applicable) Morningstar RatingTM metrics. For each fund with at least a three-year history, Morningstar calculates a Morningstar RatingTM based on a Morningstar Risk-Adjusted Return measure that accounts for variation in a fund’s monthly performance (including the effects of sales charges, loads and redemption fees), placing more emphasis on downward variations and rewarding consistent performance. The top 10% of the funds in each category receive 5 stars, the next 22.5% receive 4 stars, the next 35% receive 3 stars, the next 22.5% receive 2 stars and the bottom 10% receive 1 star. (Each share class is counted as a fraction of one fund within this scale and rated separately, which may cause slight variations in the distribution percentages). The Morningstar RatingTM may differ among share classes of a mutual fund as a result of different sales loads and/or expense structures. It may be based, in part, on the performance of a predecessor fund. Morningstar does not rate funds with less than a three-year performance history.

The Morningstar percentile ranking is based on the fund’s total-return percentile rank relative to all funds that have the same category for the same time period. The highest (or most favorable) percentile rank is 1%, and the lowest (or least favorable) percentile rank is 100%. Morningstar total-return includes both income and capital gains or losses and is not adjusted for sales charges. The top-performing funds in a category will always receive a rank of 1.

Morningstar performance on an asset-weighted basis is calculated by taking all funds and assigning the assets under management (“AUM”) in each respective fund to either the 1st, 2nd, 3rd or 4th quartile bucket based on each fund’s respective Morningstar relative ranking. The total AUM of each quartile’s bucket is then divided by complex-wide total AUM to arrive at the respective percent of AUM in each bucket.

Please consider the charges, risks, expenses and investment objectives carefully before investing. For a prospectus containing this and other information, please call Janus at (800) 525-3713 or download the file from www.janus.com/info. Read it carefully before you invest or send money.

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Funds distributed by Janus Distributors LLC.

Certain statements in this press release constitute “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Such forward-looking statements involve known and unknown risks, uncertainties, assumptions and other factors which may cause the actual results, performance or achievements of the Company to be materially different from any future results, performance or achievements expressed or implied by such forward-looking statements. Statements preceded by, followed by or that otherwise include the words “believes,” “expects,” “anticipates,” “intends,” “projects,” “estimates,” “plans,” “may increase,” “may fluctuate,” “forecast” and similar expressions or future or conditional verbs such as “will,” “should,” “would,” “may” and “could” are generally forward-looking in nature and not historical facts. Any statements that refer to expectations or other characterizations of future events, circumstances or results are forward-looking statements. These statements are based on the beliefs and assumptions of Company management based on information currently available to management.

Various risks, uncertainties, assumptions and factors that could cause future results to differ materially from those expressed by the forward-looking statements included in this press release include, but are not limited to, risks specified in the Company’s Annual Report on Form 10-K for the year ended December 31, 2012, included under headings such as “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and in other filings and furnishings made by the Company with the SEC from time to time. In light of these risks, uncertainties, assumptions and factors, the forward-looking events discussed in this press release may not occur. Many of these factors are beyond the control of the Company and its management. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date stated, or if no date is stated, as of the date of this press release. Except for the Company’s ongoing obligations to disclose material information under the applicable securities law and stock exchange rules, the Company undertakes no obligation to release publicly any revisions to any forward-looking statements, to report events or to report the occurrence of unanticipated events.

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