Exhibit 99.1

//FOR IMMEDIATE RELEASE//

Media Contact: Kelli Christman: 816.860.5088

Investor Relations Contact: Kay Gregory: 816.860.7106

UMB Financial Corporation Reports Second Quarter 2015 Earnings of $30.2 million, or $0.65 per Diluted Share

Selected second quarter financial highlights:

KANSAS CITY, Mo. (July 28, 2015) – UMB Financial Corporation (Nasdaq: UMBF), a diversified financial holding company, announced earnings for the three months ended June 30, 2015 of $30.2 million or $0.65 per share ($0.65 diluted). This is a decrease of $4.5 million, or 12.9 percent, compared to second quarter 2014 earnings of $34.7 million or $0.77 per share ($0.76 diluted). Earnings for the six months ended June 30, 2015, were $64.0 million or $1.40 per share ($1.39 diluted). This is an increase of $5.9 million, or 10.1 percent, compared to the earnings for the six months ended June 30, 2014 of $58.1 million or $1.30 per share ($1.28 diluted).

On May 31, 2015 the company completed its previously announced acquisition of Marquette Financial Companies (Marquette). This acquisition resulted in assets with an acquired value of $1.3 billion being added to the company’s balance sheet on that date.

“The highlight of the second quarter was closing on our acquisition of Marquette Financial Companies,” said Mariner Kemper, Chairman and Chief Executive Officer. “The combination is already producing positive results, helping drive a $2.0 billion, or 28.8 percent, end-of-period increase in total loan balances compared to the second quarter of 2014. At June 30, the acquired loans plus production in the legacy Marquette channels comprised $1.0 billion of the increase in total loan balances. The remaining increase of $1.0 billion was generated by legacy UMB lenders, for a year-over-year increase of 14.4 percent, and a linked-quarter increase of 5.6 percent. This is a testament to the strength of our commercial-lending franchise.

“While we experienced solid net-interest-income growth in the second quarter, noninterest income contracted, primarily due to continued revenue headwinds from Scout Investments. To address ongoing revenue and expense pressures, we remain focused on revenue growth but have increased attention on our expense structure as well. In the second quarter, we consolidated several customer-facing

lines of business—primarily in the bank—to more efficiently deliver our customer-service strategy. Additionally, we reorganized our technology, operations, and related support groups. These and related actions are a strategic first step to improve our efficiency ratio and are expected to provide an annualized cost savings of approximately $3.6 million. We have already begun to engage in additional planning and are committed to sharing details later in 2015.”

Net Interest Income and Margin

Net interest income for the second quarter of 2015 increased $11.2 million, or 13.0 percent, compared to the same period in 2014. Average earning assets increased $1.4 billion, or 10.0 percent, compared to the second quarter of 2014. This increase was primarily due to a $1.2 billion, or 17.0 percent, increase in average loans. Marquette added earning assets with an acquired value of $1.3 billion including loan balances with an acquired value of $980.3 million on May 31, 2015. Net interest margin increased six basis points to 2.59 percent for the three months ended June 30, 2015, compared to the same quarter in 2014.

Noninterest Income and Expense

Noninterest income decreased $14.5 million, or 10.8 percent, for the three months ended June 30, 2015, compared to the same period in 2014. This decrease is largely attributable to decreased trust and securities processing income of $6.0 million, or 8.1 percent, for the three months ended June 30, 2015, compared to the same period in 2014. This decrease in trust and securities processing income was primarily due to an $8.5 million, or 34.9 percent, decrease in advisory fee income from the Scout Funds. This decrease was offset by an increase in fees related to institutional and personal investment management services of $1.5 million, or 6.6 percent, an increase in fund administration and custody services of $0.5 million, or 2.2 percent, and an increase in corporate trust fees of $0.5 million, or 15.8 percent. Equity earnings on alternative investments decreased $4.6 million due to a decline in unrealized gains on Prairie Capital Management (PCM) equity method investments for the three months ended June 30, 2015, compared to the same period in 2014. Other noninterest income decreased $3.0 million primarily driven by a gain on the sale of a branch property of $2.8 million that was recorded in the second quarter of 2014.

Noninterest expense increased $5.8 million, or 3.5 percent, for the three months ended June 30, 2015, compared to the same period in 2014. Salary and benefits expense increased $10.1 million, or 11.2 percent, due to increases in salaries and wages of $7.4 million, or 13.4 percent, a $1.9 million, or 9.9 percent, increase in commissions and bonuses, and a $0.8 million, or 5.0 percent, increase in employee benefits expense. The acquisition of Marquette added approximately $3.4 million of salary and benefits expense for the second quarter of 2015. Equipment expense increased $2.5 million, or 19.3 percent, due to increased computer and hardware costs related to investments for regulatory requirements, cyber security and the ongoing modernization of our core systems. These increases were offset by a decrease in processing fees of $2.2 million, or 14.6 percent, due to decreased fees paid by the advisor to distributors of the Scout Funds. The second quarter of 2014 included an additional $5.3 million of contingency reserve expense related to the earn-out amount and related incentive bonus compensation for the employees of PCM that was not repeated in the second quarter of 2015. Total acquisition expenses recognized in noninterest expense during the second quarter totaled $0.7 million.

Balance Sheet

Average total assets for the three months ended June 30, 2015 were $17.4 billion compared to $15.6 billion for the same period in 2014, an increase of $1.8 billion, or 11.5 percent. Average earning assets increased by $1.4 billion for the period, or 10.0 percent.

Average loan balances for the three months ended June 30, 2015, increased $1.2 billion, or 17.0 percent, to $8.1 billion compared to the same period in 2014. Actual loan balances on June 30, 2015, were $8.9 billion, an increase of $2.0 billion, or 28.8 percent, compared to June 30, 2014. The overall actual loan increase at June 30, 2015 was driven by an increase in commercial real estate loans of $658.2 million, or 38.1 percent, a $593.3 million, or 16.8 percent, increase in commercial loans, a $211.3 million, or 100.0 percent, increase in asset-based loans, a $163.9 million, or 70.7 percent, increase in construction real estate loans, a $134.2 million, or 44.9 percent, increase in residential real estate loans, and a $109.2 million, or 100.0 percent, increase in factoring loans. A significant driver in

the increase in loans was the acquisition of Marquette and its loan portfolio with an acquired value of $980.3 million at May 31, 2015. These acquired Marquette loans and loans originated through the legacy Marquette channels had an actual balance at June 30, 2015 of $1.0 billion. This total includes $343.4 million in commercial real estate loans, $211.3 million in asset-based loans, $109.2 million in factoring loans, $105.7 million in commercial loans, and $98.3 million in residential real estate loans. The remaining increase in loans of $1.0 billion compared to June 30, 2014 is comprised of loans originated through the legacy UMB channels. This increase was primarily driven by an increase in commercial loans of $487.6 million and a $314.8 million increase in commercial real estate loans.

Nonperforming loans increased to $37.6 million on June 30, 2015, from $27.2 million on June 30, 2014. Nonperforming loans are defined as nonaccrual loans and restructured loans. As a percentage of loans, nonperforming loans increased to 0.42 percent as of June 30, 2015, compared to 0.39 percent on June 30, 2014. The company’s allowance for loan losses totaled $77.7 million, or 0.87 percent of loans, as of June 30, 2015, compared to $76.8 million, or 1.11 percent of loans, as of June 30, 2014.

For the three months ended June 30, 2015, average securities, including trading securities, totaled $7.4 billion. This is an increase of $442.3 million, or 6.3 percent, from the same period in 2014.

Average total deposits increased $1.1 billion, or 9.4 percent, to $13.4 billion for the three months ended June 30, 2015, compared to the same period in 2014. Deposit balances with an acquired value of $944.1 million at May 31, 2015 were acquired as part of the Marquette acquisition. Average noninterest-bearing demand deposits increased $351.4 million, or 6.8 percent, in the period compared to the same one in 2014. Average interest-bearing deposits increased by $798.1 million, or 11.2 percent, in the second quarter of 2015 as compared to the same period in 2014. Total actual deposits as of June 30, 2015, were $14.5 billion, compared to $12.2 billion as of June 30, 2014, a 19.1 percent increase. Also, for the three months ended June 30, 2015, average noninterest-bearing demand deposits were 41.0 percent of average total deposits.

As of June 30, 2015, UMB had total shareholders’ equity of $1.9 billion, an increase of 16.0 percent as compared to June 30, 2014. This increase is primarily attributable to the common stock issuance associated with the acquisition of Marquette of $179.7 million at May 31, 2015.

“The acquisition of Marquette furthers our strategy to shift the mix of earning assets,” said Brian Walker, Chief Financial Officer. “This continued shift, along with solid loan growth across our footprint, resulted in a 60.1 percent average loan-to-deposit ratio compared to 56.2 percent for the quarter ended June 30, 2014, and a net interest margin of 2.59 percent, an increase from 2.53 percent a year ago.”

Year-to-Date

Earnings for the six months ended June 30, 2015, were $64.0 million or $1.40 per share ($1.39 diluted). This is an increase of $5.9 million, or 10.1 percent, compared to earnings for the six months ended June 30, 2014, of $58.1 million or $1.30 per share ($1.28 diluted).

Net interest income for the six months ended June 30, 2015, increased $16.1 million, or 9.4 percent, compared to the same period in 2014. Net interest margin increased to 2.53 percent for the six months ended June 30, 2015, as compared to 2.45 percent for the same period in 2014.

Noninterest income decreased $12.2 million, or 4.8 percent, to $244.8 million for the six months ended June 30, 2015, as compared to the same period in 2014. The decrease in noninterest income is primarily driven by decreased trust and securities processing income of $10.2 million, or 7.1 percent. The decrease in trust and securities processing income was primarily due to a $17.4 million, or 35.2 percent, decrease in advisory fee income from the Scout Funds, partially offset by an increase of $3.7 million, or 8.1 percent, in fees related to institutional and personal investment management services and a $2.6 million, or 5.9 percent, increase in fund administration and custody services. Equity earnings on alternative investments decreased $8.0 million compared to the same period in 2014. Gains on securities available for sale of $8.3 million were recognized in the first six months of 2015 compared to $4.0 million for the same period in 2014, a $4.3 million increase.

Noninterest expense decreased $1.8 million, or 0.5 percent, for the six months ended June 30, 2015, compared to the same period in 2014. This decrease was driven by a $20.3 million contingency reserve expense recognized in 2014 in conjunction with the settlement agreement entered into on June 30, 2014, to resolve the PCM dispute. Of this amount $15.0 million was recognized in the first quarter of 2014 and $5.3 million was recognized in the second quarter of 2014. This decrease was largely offset by an increase in salaries and employee benefits of $19.7 million, or 11.0 percent, compared to the same period in 2014. The drivers of this increase include an increase in salary and wage expense of $12.2 million, or 11.3 percent, an increase in bonus and commission expense of $5.1 million, or 13.7 percent, and an increase in employee benefits expense of $2.4 million, or 7.2 percent. The acquisition of Marquette added approximately $3.4 million of salary and benefits expense for the first six months of 2015. Total acquisition expenses recognized in noninterest expense during the first six months of 2015 totaled $1.5 million.

Dividend Declaration

The Board of Directors declared during the company’s quarterly board meeting a $0.235 quarterly cash dividend, payable on Oct. 1, 2015, to shareholders of record at the close of business on Sept. 10, 2015.

Conference Call

The company plans to host a conference call to discuss its 2015 second quarter earnings results on July 29, 2015, at 8:30 a.m. (CDT).

Interested parties may access the call by dialing (toll-free) 877-267-8760 or (U.S.) 412-542-4148 and requesting to join the UMB Financial call. The live call can also be accessed by visiting the investor relations area of umbfinancial.com or by using the following the link:

UMB Financial 2Q 2015 Conference Call

A replay of the conference call may be heard through August 12, 2015, by calling (toll-free) 877-344-7529 or (U.S.) 412-317-0088. The replay pass code required for playback is 10068556. The call replay may also be accessed via the company’s website umbfinancial.com by visiting the investor relations area.

Forward-Looking Statements and Non-GAAP Reconciliation:

This release contains, and our other communications may contain, forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. These statements can be identified by the fact that they do not relate strictly to historical or current facts—such as our statements about expected cost savings. Forward-looking statements often use words such as “believe,” “expect,” “anticipate,” “intend,” “estimate,” “project,” “outlook,” “forecast,” “target,” “trend,” “plan,” “goal,” or other words of comparable meaning or future-tense or conditional verbs such as “may,” “will,” “should,” “would,” or “could.” Forward-looking statements convey our expectations, intentions, or forecasts about future events, circumstances, results, or aspirations. All forward-looking statements are subject to assumptions, risks, and uncertainties, which may change over time and many of which are beyond our control. You should not rely on any forward-looking statement as a prediction or guarantee about the future. Our actual future objectives, strategies, plans, prospects, performance, condition, or results may differ materially from those set forth in any forward-looking statement. Some of the factors that may cause actual results or other future events, circumstances, or aspirations to differ from those in forward-looking statements are described in our Annual Report on Form 10-K for the year ended December 31, 2014, our subsequent Quarterly Reports on Form 10-Q or Current Reports on Form 8-K, or other applicable documents that are filed or furnished with the SEC. Any forward-looking statement made by us or on our behalf speaks only as of the date that it was made. We do not undertake to update any forward-looking statement to reflect the impact of events, circumstances, or results that arise after the date that the statement was made. You, however, should consult further disclosures (including disclosures of a forward-looking nature) that we may make in any subsequent Annual Report on Form 10-K, Quarterly Report on Form 10-Q, Current Report on Form 8-K, or other applicable document that is filed or furnished with the SEC.

In this release, we provide information using the tangible book value (TBV) of Marquette Financial Companies (MFC). This table is being provided as an update to materials furnished on December 15, 2014 in relation to our announcement of the agreement to acquire MFC. This information supplements the results that are reported according to generally accepted accounting principles (GAAP) and should not be viewed in isolation from, or as a substitute for, GAAP results. The difference between the TBV of MFC and the comparable GAAP measure is reconciled later in this release. We believe that this information and the reconciliation may be useful to investors because TBV is commonly used by investors as an additional measure of a company’s total value and the strength and adequacy of its capital-management strategies.

About UMB:

UMB Financial Corporation (Nasdaq: UMBF) is a diversified financial holding company headquartered in Kansas City, Mo., offering complete banking services, payment solutions, asset servicing and institutional investment management to customers. UMB operates banking and wealth management centers throughout Missouri, Illinois, Colorado, Kansas, Oklahoma, Nebraska, Arizona and Texas, as well as two national specialty-lending businesses. Subsidiaries of the holding company include companies that offer services to mutual funds and alternative-investment entities and registered investment advisors that offer equity and fixed income strategies to institutions and individual investors. For more information, visit umb.com, umbfinancial.com, blog.umb.com or follow us on Twitter at @UMBBank, Facebook at facebook.com/UMBBank and LinkedIn at linkedin.com/company/umb-bank.