Exhibit 99.1

FOR IMMEDIATE RELEASE

STIFEL REPORTS FIRST QUARTER 2015 FINANCIAL RESULTS

ST. LOUIS, May 11, 2015 – Stifel Financial Corp. (NYSE: SF) today reported net income of $43.1 million, or $0.56 per diluted common share on net revenues of $561.0 million for the three months ended March 31, 2015, compared with net income of $47.4 million, or $0.63 per diluted common share, on net revenues of $546.8 million for the first quarter of 2014.

For the three months ended March 31, 2015, the Company reported non-GAAP net income of $49.9 million, or $0.65 per diluted common share, compared with non-GAAP net income of $51.4 million, or $0.68 per diluted common share for the first quarter of 2014. These non-GAAP results exclude merger-related expenses associated with the Company’s acquisitions.

Chairman’s Comments

“We are pleased with our first quarter results, which represent our third best revenue quarter. That said, while investment banking was a good quarter, results can and will be lumpy, especially as we continue to build-out our capabilities. Looking forward, we are optimistic about the continued growth in our business.

In today’s environment, we see ample opportunities to continue to build the premier investment banking and wealth management firm.”

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Brokerage Revenues

Brokerage revenues, defined as commissions plus principal transactions, were $280.5 million, a 1% decrease compared with the first quarter of 2014 and a 4% increase compared with the fourth quarter of 2014.

Investment Banking Revenues

Investment banking revenues were $125.1 million, an 8% decrease compared with the first quarter of 2014 and a 28% decrease compared with record revenues in the fourth quarter of 2014.

Asset Management and Service Fee Revenues

Asset management and service fee revenues were a record $113.9 million, a 28% increase compared with the first quarter of 2014 and an 8% increase compared with the fourth quarter of 2014. The increase is due to the higher value of fee-based accounts as a result of market appreciation and new client assets.

Compensation and Benefits Expenses

For the quarter ended March 31, 2015, compensation and benefits expenses were $355.7 million, which included $3.4 million of merger-related expenses. This compares with $347.0 million in the first quarter of 2014 and $370.5 million in the fourth quarter of 2014.

Excluding merger-related expenses, compensation and benefits as a percentage of net revenues was 62.5% in the first quarter of 2015, compared with 62.9% in the first quarter of 2014 and 61.5% in the fourth quarter of 2014.

Transition pay, which primarily consists of amortization of retention awards, signing bonuses, and upfront notes, was 4.1% of net revenues in the first quarter of 2015, compared with 4.3% in the first quarter of 2014 and 4.0% in the fourth quarter of 2014.

Non-Compensation Operating Expenses

For the quarter ended March 31, 2015, non-compensation operating expenses were $135.2 million, which included merger-related expenses of $4.6 million. This compares with $122.3 million in the first quarter of 2014 and $138.5 million in the fourth quarter of 2014.

Excluding merger-related expenses, non-compensation operating expenses as a percentage of net revenues for the quarter ended March 31, 2015 was 23.2%, compared with 21.9% in the first quarter of 2014 and 23.0% in the fourth quarter of 2014.

Provision for Income Taxes

The effective income tax rate for the quarter ended March 31, 2015 was 38.5% compared with 38.6% in the first quarter of 2014 and 34.4% in the fourth quarter of 2014.

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Assets and Capital

Assets

Capital

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Conference Call Information

Stifel Financial Corp. will host its first quarter 2015 financial results conference call on Monday, May 11, 2015, at 5:00 p.m. Eastern time. The conference call may include forward-looking statements.

All interested parties are invited to listen to Stifel’s Chairman and CEO, Ronald J. Kruszewski, by dialing (877) 876-9938 and referencing conference ID #43107466. A live audio webcast of the call, as well as a presentation highlighting the Company’s results, will be available through the Company’s web site, www.stifel.com. For those who cannot listen to the live broadcast, a replay of the broadcast will be available through the above-referenced web site beginning approximately one hour following the completion of the call.

Company Information

Stifel Financial Corp. (NYSE: SF) is a financial services holding company headquartered in St. Louis, Missouri, that conducts its banking, securities, and financial services business through several wholly owned subsidiaries. Stifel’s broker-dealer clients are served in the United States through Stifel, Nicolaus & Company, Incorporated; Keefe Bruyette & Woods, Inc.; Miller Buckfire & Co., LLC; and Century Securities Associates, Inc., and in the United Kingdom and Europe through Stifel Nicolaus Europe Limited; Keefe, Bruyette & Woods Limited; and Oriel Securities Limited. The Company’s broker-dealer affiliates provide securities brokerage, investment banking, trading, investment advisory, and related financial services to individual investors, professional money managers, businesses, and municipalities. Stifel Bank & Trust offers a full range of consumer and commercial lending solutions. Stifel Trust Company, N.A. and 1919 Investment Counsel & Trust Company offer trust and related services. To learn more about Stifel, please visit the Company’s web site at www.stifel.com.

Forward-Looking Statements

This earnings release contains certain statements that may be deemed to be “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. All statements in this earnings release not dealing with historical results are forward-looking and are based on various assumptions. The forward-looking statements in this earnings release are subject to risks and uncertainties that could cause actual results to differ materially from those expressed in or implied by the statements. Factors that may cause actual results to differ materially from those contemplated by such forward-looking statements include, among other things, the following possibilities: the ability to successfully integrate acquired companies or the branch offices and financial advisors; a material adverse change in financial condition; the risk of borrower, depositor, and other customer attrition; a change in general business and economic conditions; changes in the interest rate environment, deposit flows, loan demand, real estate values, and competition; changes in accounting principles, policies, or guidelines; changes in legislation and regulation; other economic, competitive, governmental, regulatory, geopolitical, and technological factors affecting the companies’ operations, pricing, and services; and other risk factors referred to from time to time in filings made by Stifel Financial Corp. with the Securities and Exchange Commission. Forward-looking statements speak only as to the date they are made. Stifel Financial Corp. disclaims any intent or obligation to update forward-looking statements to reflect circumstances or events that occur after the date the forward-looking statements are made.

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Statistical Information

Business Segment Results

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Global Wealth Management Summary Results of Operations (Unaudited)

Stifel Bank & Trust (Unaudited)

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Institutional Group Summary Results of Operations (Unaudited)

Institutional Group Brokerage & Investment Banking Revenues (Unaudited)

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Non-GAAP Financial Measures

The Company utilized non-GAAP calculations of presented net revenues, compensation and benefits, non-compensation operating expenses, income before income taxes, provision for income taxes, net income, compensation and non-compensation operating expense ratios, pre-tax margin, and basic and diluted earnings per share as additional measures to aid in understanding and analyzing the Company’s financial results for the three months ended March 31, 2015. Specifically, the Company believes that the non-GAAP measures provide useful information by excluding certain items that may not be indicative of the Company’s core operating results and business outlook. The Company believes that these non-GAAP measures will allow for a better evaluation of the operating performance of the business and facilitate a meaningful comparison of the Company’s results in the current period to those in prior and future periods. Reference to these non-GAAP measures should not be considered as a substitute for results that are presented in a manner consistent with GAAP. These non-GAAP measures are provided to enhance investors’ overall understanding of the Company’s current financial performance. These non-GAAP amounts exclude certain compensation and non-compensation operating expenses associated with the Company’s acquisitions and the write-off of debt issuance costs as a result of the redemption of our 6.70% senior notes in January 2015.

A limitation of utilizing these non-GAAP measures of net revenues, compensation and benefits, non-compensation operating expenses, income before income taxes, provision for income taxes, net income, compensation and non-compensation operating expenses ratios, pre-tax margin, and basic and diluted earnings per share is that the GAAP accounting effects of these merger-related charges do in fact reflect the underlying financial results of the Company’s business and these effects should not be ignored in evaluating and analyzing its financial results. Therefore, the Company believes that GAAP measures of net revenues, compensation and benefits, non-compensation operating expenses, income before income taxes, provision for income taxes, net income, compensation and non-compensation operating expense ratios, pre-tax margin, and basic and diluted earnings per share and the same respective non-GAAP measures of the Company’s financial performance should be considered together.

The following table provides details with respect to reconciling net revenues, compensation and benefits, non-compensation operating expenses, income before income taxes, provision for income taxes, net income, compensation and non-compensation operating expense ratios, pre-tax margin, and basic and diluted earnings per share on a GAAP basis for the three months ended March 31, 2015 to the aforementioned expenses on a non-GAAP basis for the same period.

Investor Relations

Sarah Anderson

(415) 364-2500, investorrelations@stifel.com

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