Exhibit 99.1

Media Contact:

Margaret Kirch Cohen, +1 312-696-6383 or margaret.cohen@morningstar.com

Investors may submit questions to investors@morningstar.com.

FOR IMMEDIATE RELEASE

Morningstar, Inc. Declares Quarterly Dividend; Increases Dividend to 17 Cents Per Share and Share Repurchase Program by $200 Million

CHICAGO, Dec. 6, 2013—The board of directors of Morningstar, Inc. (NASDAQ: MORN), a leading provider of independent investment research, today declared a quarterly dividend of 17 cents per share payable Jan. 31, 2014 to shareholders of record as of Jan. 10, 2014. The declaration reflects an increase in the quarterly dividend to 17 cents per share from 12.5 cents.

While subsequent dividends will be subject to board approval, the company expects to pay three additional dividends in 2014:

Morningstar’s board also approved an increase to the company’s total share repurchase authorization from $500 million to $700 million. Since Morningstar announced its share repurchase program in October 2010, it has repurchased a total of 6.0 million shares for approximately $370.4 million. Of the $700 million total now authorized under the program, $329.6 million remains for future repurchases.

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About Morningstar, Inc.

Morningstar, Inc. is a leading provider of independent investment research in North America, Europe, Australia, and Asia. The company offers an extensive line of products and services for individual investors, financial advisors, asset managers, and retirement plan providers and sponsors. Morningstar provides data on approximately 437,000 offerings, including stocks, mutual funds, and similar vehicles, along with real-time global market data on more than 10 million equities, indexes, futures, options, commodities, and precious metals, in addition to foreign exchange and Treasury markets. Morningstar also offers investment management services through its registered investment advisor subsidiaries and has approximately $176 billion in assets under advisement and management as of Sept. 30, 2013. The company has operations in 27 countries.

Caution Concerning Forward-Looking Statements

This press release contains forward-looking statements as that term is used in the Private Securities Litigation Reform Act of 1995. These statements are based on our current expectations about future events or future financial performance. Forward-looking statements by their nature address matters that are, to different degrees, uncertain, and often contain words such as “may,” “could,” “expect,” “intend,” “plan,” “seek,” “anticipate,” “believe,” “estimate,” “predict,” “potential,” or “continue.” These statements involve known and unknown risks and uncertainties that may cause the events we discuss not to occur or to differ significantly from what we expect. For us, these risks and uncertainties include, among others, general industry conditions and competition, including current global financial uncertainty; the impact of market volatility on revenue from asset-based fees; damage to our reputation resulting from claims made about possible conflicts of interest; liability for any losses that result from an actual or claimed breach of our fiduciary duties; financial services industry consolidation; liability related to the storage of personal information about our users; a prolonged outage of our database and network facilities; challenges faced by our non-U.S. operations; the availability of free or low-cost investment information; and liability and/or damage to our reputation as a result of some of our currently pending litigation. A more complete description of these risks and uncertainties can be found in our filings with the Securities and Exchange Commission, including our Annual Report on Form 10-K for the year ended December 31, 2012. If any of these risks and uncertainties materialize, our actual future results may vary significantly from what we expected. We do not undertake to update our forward-looking statements as a result of new information or future events.

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©2013 Morningstar, Inc. All Rights Reserved.

MORN-C

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