Exhibit 99.1

FOR IMMEDIATE RELEASE

MOBILE MINI REPORTS Q2’14 RESULTS

Tempe, AZ – July 30, 2014 — Mobile Mini, Inc. (NASDAQ GS: MINI), the world’s leading supplier of portable storage solutions, today reported actual and adjusted financial results for the quarter ended June 30, 2014. Total revenues were $106.5 million and leasing revenues were $98.0 million, up from $97.1 million and $88.0 million, respectively, for the same period last year. The Company’s second quarter net income was $9.3 million, or $0.20 per diluted share, compared to a net loss of $14.4 million, or $0.32 per diluted share, respectively, for the second quarter of 2013. Prior year results included a charge of $40.2 million related to the impairment of certain leasing and other assets determined to be either non-core or uneconomic to repair. On an adjusted basis, second quarter net income was $10.8 million, or $0.23 per diluted share, compared to $11.7 million, or $0.25 per diluted share, respectively, for the second quarter of 2013.

Adjusted EBITDA was $36.0 million and adjusted EBITDA margin was 33.8% for the second quarter of 2014.

Second Quarter 2014 Highlights

Erik Olsson, Mobile Mini’s President and Chief Executive Officer, commented, “I am very pleased with our strong double-digit year-over-year increase in leasing revenues, especially considering that we implemented a major reorganization of our sales force during the quarter. In addition, excluding our incremental investments in fleet repairs and repositioning, we produced an adjusted EBITDA margin of approximately 38%, meaning our strategic plan is on track. We also continued to generate strong free cash flow, which we used in part to expand our footprint in North America and plan on entering additional new markets during the second half of the year.”

Mr. Olsson added, “We continue to execute on our strategic plan by refining and enhancing both our sales organization as well as our field operations. With another quarter behind us, we are even more confident on our stated expectations for 2014 of a year-over-year top-line growth rate and profitability exceeding that of 2013, resulting in increased free cash flow generation for the year.”

Dividend

The Company’s regular quarterly cash dividend of $0.17 per share will be paid on September 3, 2014 to shareholders of record on August 20, 2014.

EBITDA, adjusted EBITDA, EBITDA margin, adjusted EBITDA margin, adjusted net income, adjusted diluted EPS, and free cash flow are non-GAAP financial measures as defined by Securities and Exchange Commission (“SEC”) rules. Reconciliations of these measurements to the most directly comparable GAAP financial measures can be found later in this release.

Conference Call

Mobile Mini will host a conference call today, Wednesday, July 30, 2014, at 12 noon ET to review these results. To listen to the call live, dial (201) 493-6739 and ask for the Mobile Mini Conference Call or go to www.mobilemini.com and click on the Investors section. Additionally, a slide presentation that will accompany the call and the reconciliation of non-GAAP financial measures used in the slide show to the most directly comparable GAAP financial measures will be posted at www.mobilemini.com on the Investors section and will be available in advance and after the call. Please go to the website 15 minutes early to download and install any necessary audio software. If you are unable to listen live, a replay of the call can be accessed for approximately 14 days after the call at Mobile Mini’s website.

Mobile Mini, Inc. is the world’s leading provider of portable storage solutions through its total lease fleet of over 213,000 portable storage containers and office units with 135 locations in the U.S., United Kingdom, and Canada. Mobile Mini is included on the Russell 2000^® and 3000^® Indexes and the S&P Small Cap Index.

This news release contains forward-looking statements, including, but not limited to, our expectations regarding our ability to execute our strategic plan, growth and profitability, financial performance, ability to enter new markets, and increased free cash flow, which involve risks and uncertainties that could cause actual results to differ materially from those currently anticipated. Risks and uncertainties that may affect future results include those that are described from time to time in the Company’s SEC filings. These forward-looking statements represent the judgment of the Company, as of the date of this release, and Mobile Mini disclaims any intent or obligation to update forward-looking statements.

(See Accompanying Tables)

Mobile Mini, Inc.

Condensed Consolidated Statements of Operations

(Unaudited)/(in thousands except per share data)/(includes effects of rounding)

In 2013, represents the impairment charge primarily for the write down on certain assets classified as held for sale and is excluded in the adjusted presentation.

Mobile Mini, Inc.

Condensed Consolidated Statements of Operations

(Unaudited)/(in thousands except per share data)/(includes effects of rounding)

In 2013, represents the impairment charge primarily for the write down on certain assets classified as held for sale and is excluded in the adjusted presentation.

Mobile Mini, Inc.

Non-GAAP Reconciliations

(in thousands)

(includes effects of rounding)

In 2013, represents the impairment charge primarily for the write down on certain assets classified as held for sale and is excluded in the adjusted presentation.

Mobile Mini, Inc.

Non-GAAP Reconciliations

(in thousands)

(includes effects of rounding)

In 2013, represents the impairment charge primarily for the write down on certain assets classified as held for sale and is excluded in the adjusted presentation.

Mobile Mini, Inc.

Non-GAAP Reconciliations

(in thousands)/(includes effects of rounding)

Mobile Mini, Inc.

Condensed Consolidated Balance Sheets

(in thousands except par value data)/(Includes effects of rounding)

Mobile Mini, Inc.

Condensed Consolidated Statements of Cash Flows

(Unaudited)/(in thousands)/(includes effects of rounding)

The sale of our Netherlands operation in 2013 is reflected in the financial data herein as a discontinued operation.

This news release includes the financial measures “EBITDA”, “adjusted EBITDA”, “EBITDA margin”, “adjusted EBITDA margin”, “adjusted SG&A”, “adjusted net income”, “adjusted diluted earnings per share” and “free cash flow.” These measurements are deemed “non-GAAP financial measures” under rules of the SEC, including Regulation G. This non-GAAP financial information may be determined or calculated differently by other companies.

EBITDA is defined as net income before discontinued operation, net of taxes, interest expense, income taxes, depreciation and amortization, and, if applicable, debt restructuring or extinguishment costs, including any write-off of deferred financing costs. We further adjust EBITDA to exclude non-cash share-based compensation expense and to ignore the effect of what we consider transactions or events not related to our core business to arrive at adjusted EBITDA. The GAAP financial measure that is most directly comparable to EBITDA is net cash provided by operating activities. EBITDA and adjusted EBITDA margins are calculated by dividing consolidated EBITDA and adjusted EBITDA by total revenues. The GAAP financial measure that is most directly comparable to EBITDA margin is operating margin, which represents operating income divided by revenues. We present adjusted EBITDA and adjusted EBITDA margin because we believe they provide useful information regarding our ability to meet our future debt payment requirements, capital expenditures and working capital requirements and they provide an overall evaluation of our financial condition. We include adjusted EBITDA in this earnings announcement to provide transparency to investors. Adjusted EBITDA has certain limitations as an analytical tool and should not be used as a substitute for net income, cash flows, or other consolidated income or cash flow data prepared in accordance with GAAP or as a measure of our profitability or our liquidity. EBITDA margin is presented along with the operating margin so as not to imply that more emphasis should be placed on it than the corresponding GAAP measure.

Free cash flow is defined as net cash provided by operating activities, minus or plus, net cash used in or provided by investing activities, excluding acquisitions and certain transactions. Free cash flow is a non-GAAP financial measure and is not intended to replace net cash provided by operating activities, the most directly comparable GAAP financial measure. We present free cash flow because we believe it provides useful information regarding our liquidity and ability to meet our short-term obligations. In particular, free cash flow indicates the amount of cash available after capital expenditures for, among other things, investments in the Company’s existing businesses, debt service obligations, pay authorized quarterly dividends and strategic acquisitions.

Adjusted SG&A, adjusted net income and adjusted diluted earnings per share permit a comparative assessment of our SG&A expenses, net income and diluted earnings per share by excluding certain one-time expenses and restructuring expenses to make a more meaningful comparison of our operating performance.

Earlier in this release, we provided a reconciliation of these adjusted measurements to actual results along with a reconciliation of EBITDA to net cash provided by operating activities, net income to EBITDA and adjusted EBITDA and net cash provided by operating activities to free cash flow.