Exhibit 99.1

Manitex International, Inc. Reports First Quarter 2015 Results

Bridgeview, IL, May 11, 2015 — Manitex International, Inc. (Nasdaq: MNTX), a leading international provider of cranes and specialized material and container handling equipment, today announced first quarter 2015 results.

First Quarter 2015 Financial Highlights:

Transactions:

Chairman and Chief Executive Officer, David Langevin, commented, “We have brought together an exceptional portfolio of specialized industrial equipment businesses and are making good progress integrating our most recent acquisitions. This was the first quarter in which we have included both ASV and PM Group in our results, and as expected, our financials have changed significantly, with revenues now running at over $100 million per quarter. The opportunity to add PM knuckle boom cranes to our North American assembly operations and market throughout our dealer network remains a top priority for this year and beyond, and we’re excited about growing this business. ASV also remains an exciting opportunity for us, with modest improvement in US construction markets expected this year, which will benefit ASV’s performance. Given continued global economic softness, we are concentrating our efforts on optimizing our cost structure and allocating resources to our higher margin business units that we believe will drive our future growth.”

Net revenues increased $43.3 million to $105.9 million for the three months ended March 31, 2015 from $62.6 million for the comparable period in 2014. Without the ASV and PM transactions, which had combined revenues of $48.6 million, revenues would have decreased $5.3 million, of which $3.4 resulted from the impact of currency translation with a stronger U.S. dollar compared to the first quarter of 2014. PM knuckle boom crane sales were encouraging in the quarter in most sales regions, and particularly in the Americas and Europe where construction activity continued to show improvement. ASV sales were substantially focused on the North American market and for the quarter were skewed more heavily towards the lower capacity units used in more general construction activity. We experienced a reduction in the first quarter sales of the Manitex boom truck business in trucks having greater than a 40 ton capacity principally related to the decline in demand from the energy sector. The majority of this decline was offset by increased sales of material handling equipment reflecting increased shipments of military forklifts. Sales in the Equipment Distribution segment were $1.2 million lower than in the comparable period of 2014.

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Adjusted net income for the first quarter of 2015, excluding $3.0 million pretax of acquisition related and other costs related to the transactions for the newly acquired businesses of ASV and PM, was $1.5 million or $0.10 per share compared to net income of $1.9 million and $0.14 per share for the first quarter of 2014. Operating income adjusted for the acquisition expenses in the first quarter of 2015 was 4.9% of sales compared to 5.8% for the three months ended March 31, 2014, resulting from an adverse sales mix of lower capacity product and lower crane sales that was only partially offset by $0.8 million of lower operating expenses, excluding the acquired businesses. On an adjusted basis, gross margin was 20% and SG&A as a percentage of sales was 14% for the quarter, compared to 18.5% and 11.6% respectively for the three months ended March 31, 2014, reflecting some of the structural changes from the recent acquisitions, including additional operations, both sales and manufacturing, in a number of overseas locations.

Andrew Rooke, Manitex International President and Chief Operating Officer, commented, “During the first quarter we commenced the integration and assimilation of our recent acquisitions into the Company. ASV and PM contributed almost $50 million to our top line and provided additional diversification of product and market to our profile. During the quarter we were very active in the market with our distribution networks and received a very positive reception as we commenced the re-launch of the ASV brand as well as actively promoting the PM knuckle boom crane. Our cost reduction program announced at the end of last year, picked up steam during the quarter and had a positive impact in the quarter helping to offset the gross margin effect of some adverse sales mix, and we are on track to achieve the $4 million goal set for 2015. The recent expansion of the Company through the acquisition of ASV and PM has increased our leverage and we have rapidly attacked our debt, making principal repayments of $2.8 million, including a $1.5 million advance payment in March to satisfy all 2015 principal payments on the PM acquisition term loan. Our objective is continue to pay off debt through working capital improvements during 2015 and beyond, with the objective of returning our balance sheet ratios in time back to our normalized levels.”

Mr. Langevin concluded, “Our plan for this year remains to integrate and execute, and this will require continued emphasis on cost containment, integrating our operations, and managing our balance sheet for the benefit of our shareholders. Going forward we would expect to allocate our future cash flows to investing in our higher-margin businesses and paying down our debt to maintain the financial flexibility that has been a hallmark of this company since we first started this in 2006.”

Conference Call:

Management will host a conference call at 4:30 PM Eastern Time today to discuss the results with the investment community. Anyone interested in participating in the call should dial 1-800-967-7134 if calling within the United States or 719-325-2418 if calling internationally. A replay will be available until May 18, 2015 which can be accessed by dialing 877-870-5176 if calling within the United States or 858-384-5517 if calling internationally. Please use passcode 7731331 to access the replay. The call will additionally be broadcast live and archived for 90 days over the internet with accompanying slides, accessible at the investor relations portion of the Company’s corporate website, www.manitexinternational.com/eventspresentations.aspx.

About Manitex International, Inc.

Manitex International, Inc. is a leading worldwide provider of highly engineered specialized equipment including boom truck, truck and knuckle boom cranes, container handling equipment and reach stackers, rough terrain forklifts, and other related equipment. Our products, which are manufactured in facilities located in the USA, Canada, and Italy, are targeted to selected niche markets where their unique designs and engineering excellence fill the needs of our customers and provide a competitive advantage. We have consistently added to our portfolio of branded products and equipment both through internal development and focused acquisitions to diversify and expand our sales and profit base while remaining committed to our niche market strategy. Our brands include Manitex, PM, O&S, CVS Ferrari, Badger, Liftking, Load King, Sabre, and Valla. ASV, our Venture with Terex Corporation, manufactures and sells a line of high quality compact track and skid steer loaders.

Forward-Looking Statement

Safe Harbor Statement under the U.S. Private Securities Litigation Reform Act of 1995: This release contains statements that are forward-looking in nature which express the beliefs and expectations of management including statements regarding the Company’s expected results of operations or liquidity; statements concerning projections, predictions, expectations, estimates or forecasts as to our business, financial and operational results and future economic performance; and statements of management’s goals and objectives and other similar expressions concerning matters that are not historical facts. In some cases, you can identify forward-looking statements by terminology such as “anticipate,” “estimate,” “plan,” “project,” “continuing,” “ongoing,” “expect,” “we believe,” “we intend,” “may,” “will,” “should,” “could,” and similar expressions. Such statements are based on current plans, estimates and expectations and involve a number of known and unknown risks, uncertainties and other factors that could cause the Company’s future results, performance or achievements to differ significantly from the results, performance or achievements expressed or implied by such forward-looking statements. These factors and additional information are discussed in the Company’s filings with the Securities and Exchange Commission and statements in this release should be evaluated in light of these important factors. Although we believe that these statements are based upon reasonable assumptions, we cannot guarantee future results. Forward-looking statements speak only as of the date on which they are made, and the Company undertakes no obligation to update publicly or revise any forward-looking statement, whether as a result of new information, future developments or otherwise.

MANITEX INTERNATIONAL, INC.

CONSOLIDATED STATEMENTS OF INCOME

(In thousands, except for share and per share data)

MANITEX INTERNATIONAL INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(In thousands, except share and per share data)

MANITEX INTERNATIONAL, INC.

CONSOLIDATED STATEMENT OF CASH FLOWS

(In thousands)

Supplemental Information

In an effort to provide investors with additional information regarding the Company’s results, Manitex International refers to various non-GAAP (U.S. generally accepted accounting principles) financial measures which management believes provides useful information to investors. These non-GAAP measures may not be comparable to similarly titled measures being disclosed by other companies. In addition, the Company believes that non-GAAP financial measures should be considered in addition to, and not in lieu of, GAAP financial measures. Manitex International believes that this information is useful to understanding its operating results and the ongoing performance of its underlying businesses. Management of Manitex International uses both GAAP and non–GAAP financial measures to establish internal budgets and targets and to evaluate the Company’s financial performance against such budgets and targets.

The amounts described below are unaudited, are reported in thousands of U.S. dollars, and are as of, or for the three month period ended March 31, 2015, unless otherwise indicated.

Non-GAAP Financial Measures

This press release includes the following non-GAAP financial measures: “Adjusted EBITDA” (earnings before interest, tax, foreign exchange transaction gain / losses, other income / expense acquisition related expense and other exceptional costs and depreciation and amortization) and Adjusted Net Income. These non-GAAP terms, as defined by the Company, may not be comparable to similarly titled measures used by other companies. Neither Adjusted Net Income nor Adjusted EBITDA are a measure of financial performance under generally accepted accounting principles. Items excluded from Adjusted EBITDA and Adjusted Net Income are significant components in understanding and assessing financial performance. Adjusted EBITDA and Adjusted Net Income should not be considered in isolation or as a substitute for net earnings, operating income and other consolidated earnings data prepared in accordance with GAAP or as a measure of our profitability. A reconciliation of net income to Adjusted EBITDA and Adjusted Net Income is provided below.

The Company’s management believes that Adjusted EBITDA and Adjusted EBITDA as a percentage of sales and Adjusted Net Income represent key operating metrics for its business. Adjusted Earnings Before Interest, Taxes, foreign exchange transaction gain / losses, other income / expense, acquisition related expense and other exceptional costs and Depreciation and Amortization (Adjusted EBITDA) and Adjusted Net Income, GAAP net income adjusted for acquisition and certain other one off items are a key indicator used by management to evaluate operating performance. While Adjusted EBITDA and Adjusted Net Income are not intended to replace any presentation included in our consolidated financial statements under generally accepted accounting principles (GAAP) and should not be considered an alternative to operating performance or an alternative to cash flow as a measure of liquidity, we believe these measures are useful to investors in assessing our operating results, capital expenditure and working capital requirements and the ongoing performance of its underlying businesses. These calculations may differ in method of calculation from similarly titled measures used by other companies. A reconciliation of Adjusted EBITDA and Adjusted Net Income to GAAP financial measures for the three month period ended March 31, 2015 and 2014 is included with this press release below and with the Company’s related Form 8-K.

Reconciliation of GAAP Net Income to Adjusted EBITDA (in thousands)

Reconciliation of GAAP Net Income to Adjusted Net Income (in thousands)

Acquisition and other expense

After tax expense and per share amounts (Adjusted Net Income) are calculated using pre-tax amounts, applying a tax rate based on jurisdictional rates to arrive at an after-tax amount. This number is divided by the weighted average diluted shares to provide the impact on earnings per share. The company assesses the impact of these items because when discussing earnings per share, the Company adjusts for items it believes are not reflective of operating activities in the periods.

There were no items adjusting First Quarter 2014.

Backlog

Backlog is defined as purchase orders that have been received by the Company. The disclosure of backlog aids in the analysis the Company’s customers’ demand for product, as well as the ability of the Company to meet that demand. Backlog is not necessarily indicative of sales to be recognized in a specified future period.

Current Ratio is calculated by dividing current assets by current liabilities.

Days Sales Outstanding, (DSO), is calculated by taking the sum of net trade and related party receivables divided by annualized sales per day (sales for the quarter, multiplied by 4, and the sum divided by 365).

Days Payables Outstanding, (DPO), is calculated by taking the sum of net trade and related party payables divided by annualized cost of sales per day (cost of goods sold for the quarter, multiplied by 4, and the sum divided by 365).

Debt is calculated using the Condensed Consolidated Balance Sheet amounts for current and long term portion of long term debt, capital lease obligations, notes payable, convertible notes and revolving credit facilities. Debt to Adjusted EBITDA ratio is calculated by dividing total debt at the balance sheet date by trailing twelve month Adjusted EBITDA.

Interest Cover is calculated by dividing Adjusted EBITDA (earnings before interest, tax, foreign exchange transaction gain / losses, other income / expense acquisition related expense and other exceptional costs and depreciation and amortization) for the trailing twelve month period (April 1 2014 to March 31, 2015) by interest expense as reported in the Consolidated Statement of Income for the same period.

Inventory turns are calculated by multiplying cost of goods sold for the referenced three month period by 4 and dividing that figure by inventory as at the referenced period.

Manufacturing Expenses include manufacturing wages, salaries, fixed and variable overhead costs.

Operating Working Capital is calculated using the Consolidated Balance Sheet amounts for Trade receivables (net of allowance) plus inventories, less Accounts payable. The Company considers excessive working capital as an inefficient use of resources, and seeks to minimize the level of investment without adversely impacting the ongoing operations of the business.

Trailing Twelve Months Adjusted EBITDA is calculated by adding the reported Adjusted EBITDA for the past 4 quarters.

Trailing Three Month Annualized Net Sales is calculated using the net sales for quarter, multiplied by four.

Working capital is calculated as total current assets less total current liabilities