Exhibit 99.1

FOR IMMEDIATE RELEASE

May 6, 2015

NN, INC. REPORTS FIRST QUARTER 2015 RESULTS

Johnson City, Tenn, May 6, 2015 –NN, Inc., (NASDAQ: NNBR) a diversified industrial company, today reported its financial results for the first quarter ended March 31, 2015.

First Quarter 2015 Results

Net sales for the first quarter of 2015 increased $61.2 million, or 60%, to $163.7 million, compared to $102.5 million for the first quarter of 2014. Excluding acquisitions that occurred after the first quarter of 2014 and currency effects, the Company had sales volume growth of $7.8 million or 7.6%, compared with the prior year. Acquisitions made subsequent to March 31, 2014 added $62.0 million in revenue. Negative currency impacts reduced reported revenue by $8.3 million versus the first quarter of last year.

Adjusted income from operations for the first quarter of 2015 was $13.9 million, an increase of 58%, compared to $8.8 million for the same period in 2014. Adjusted net income, which excludes the after-tax impact of foreign exchange on inter-company loans, increased to $6.9 million or $0.36 per diluted share, compared to $5.6 million or $0.31 per diluted share for the same period in 2014.

On a GAAP basis, income from operations for the first quarter of 2015 was $13.9 million, compared to $8.3 million for the same period in 2014. Net income on a GAAP basis for the first quarter of 2015 was $6.0 million or $0.31 per diluted share. This compares to $5.2 million or $0.29 per diluted share in the first quarter of 2014.

Richard Holder, President and Chief Executive Officer, commented, “Our first quarter results are in line with our expectations and provide a solid start to the year. The four acquisitions made in 2014 remain ahead of our stated integration and synergy targets for 2015. ”

Business Group Results

Metal Bearing Components

Net sales for the group increased $2.3 million to $73.2 million during the first quarter of 2015, compared to $70.9 million for first quarter 2014. Excluding acquisitions, volume increases, organic and adjacent market growth of $8.0 million was offset by a currency translation impact of $8.3 million. Income from operations for the first quarter was $9.1 million, compared to $8.8 million in the first quarter of 2014.

“Our opportunities in the Metal Bearing Components Group continue to expand beyond the historical scope of the business,” said Holder. “Volume and new growth opportunities continue to look strong as we head into the second quarter.”

Autocam Precision Components

Net sales for the first quarter of 2015 were $82.6 million, compared to $23.7 million in the first quarter of 2014, an increase of $58.9 million. Acquisitions accounted for $59.3 million of the increase. Income from operations for the quarter increased $5.2 million to $7.7 million, compared to $2.6 million in the first quarter of 2014.

Holder commented, “The integration of the Autocam acquisition continues to exceed our expectations and we expect this trend to continue as several programs are projected to reach expected operating performance levels during the second and third quarters of this year.”

Plastic and Rubber Components

Net sales for the first quarter were $7.9 million, which was equal to the same period in 2014. Income from operations for the quarter was $0.2 million compared to $0.2 million in 2014.

Holder concluded, “The first quarter was in line with our expectations and we anticipate continued improvement in our businesses operating performance throughout the year.”

NN will discuss its results during its quarterly investor conference call tomorrow morning starting at 9:00 a.m. ET. The call and an accompanying slide presentation may be accessed via NN’s website or www.earnings.com. For those who are unavailable to listen to the live broadcast, a replay will be available shortly after the call for 90 days.

The attached financial tables include a reconciliation of adjusted income from operations and adjusted net income to the U.S. GAAP financial measures of income from operations and net income.

NN, Inc., a diversified industrial company manufactures and supplies high precision metal bearing components, industrial plastic and rubber products and precision metal components to a variety of markets on a global basis. Headquartered in Johnson City, Tennessee, NN has 25 manufacturing plants in the United States, Western Europe, Eastern Europe, South America and China.

Except for specific historical information, many of the matters discussed in this press release may express or imply projections of revenues or expenditures, statements of plans and objectives or future operations or statements of future economic performance. These, and similar statements, are forward-looking statements concerning matters that involve risks, uncertainties and other factors which may cause the actual performance of NN, Inc. and its subsidiaries to differ materially from those expressed or implied by this discussion. All forward-looking information is provided by the Company pursuant to the safe harbor established under the Private Securities Litigation Reform Act of 1995 and should be evaluated in the context of these factors. Forward-looking statements generally can be identified by the use of forward-looking terminology such as “assumptions”, “target”, “guidance”, “outlook”, “plans”, “projection”, “may”, “will”, “would”, “expect”, “intend”, “estimate”, “anticipate”, “believe”, “potential” or “continue” (or the negative or other derivatives of each of these terms) or similar terminology. Factors which could materially affect actual results include, but are not limited to: general economic conditions and economic conditions in the industrial sector, inventory levels, regulatory compliance costs and the Company’s ability to manage these costs, start-up costs for new operations, debt reduction, competitive influences, risks that current customers will commence or increase captive production, risks of capacity underutilization, quality issues, availability and price of raw materials, currency and other risks associated with international trade, the Company’s dependence on certain major customers, and the successful implementation of the global growth plan including development of new products. Similarly, statements made herein and elsewhere regarding pending or completed acquisitions are also forward-looking statements, including statements relating to the anticipated closing date of an acquisition, the Company’s ability to obtain required regulatory approvals or satisfy closing conditions, the costs of an acquisition and the Company’s source(s) of financing, the future performance and prospects of an acquired business, the expected benefits of an acquisition on the Company’s future business and operations and the ability of the Company to successfully integrate recently acquired businesses.

For additional information concerning such risk factors and cautionary statements, please see the section titled “Risk Factors” in the Company’s periodic reports filed with the Securities and Exchange Commission, including, but not limited to, the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2014. Except as required by law, we undertake no obligation to update or revise any forward-looking statements we make in our press releases, whether as a result of new information, future events or otherwise.

Financial Tables Follow

NN, Inc.

Consolidated Statements of Income

(In thousands, except per share amounts)

(Unaudited)

NN, Inc.

Condensed Balance Sheets

(In thousands)

(Unaudited)

NN, Inc.

Reconciliation of Non-GAAP to GAAP Financial Measures

(Unaudited)

The Company’s management evaluates operating performance excluding unusual and/or nonrecurring items. The Company believes excluding such items provides a more effective and comparable measure of performance and a clearer view of underlying trends. Since net income excluding these items is not a measure calculated in accordance with GAAP, this should not be considered as a substitute for other GAAP measures, including net income, as an indicator of performance. Accordingly, net income/loss excluding the above items is reconciled to net income/loss on a GAAP basis.