Exhibit 99.1

NN, Inc.

6210 Ardrey Kell Road

Charlotte, NC 28277

FOR IMMEDIATE RELEASE

NN, INC. REPORTS FOURTH QUARTER AND FULL YEAR 2020 RESULTS

Fourth Quarter Net Sales Increased 7.5% Over Prior Year, Driving EBITDA to $16.8 million on an Adjusted Basis

Charlotte, N.C., March 11, 2021 – NN, Inc., (NASDAQ: NNBR), a diversified industrial company, today reported its financial results for the fourth quarter and full year ended December 31, 2020.

Fourth-Quarter Results

For the fourth quarter, NN posted solid improvements in sales and profitability as the Company’s core markets continued to recover from the impact of the COVID-19 pandemic. Key highlights from the quarter include:

NN, Inc. President and CEO Warren Veltman said, “We made strong progress in the fourth quarter toward driving improved operating results, which was enabled in part by the continued recovery in customer demand across our end markets, as we saw sequential increases in activity from the pandemic-related lows in the second quarter. To finish the year, we posted both sequential and year-over-year growth in revenues and solid improvements in profitability on an adjusted basis, which highlight the strong potential of our business.”

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Mobile Solutions

Net sales for the fourth quarter of 2020 were $75.1 million, compared to $67.2 million in the fourth quarter of 2019, an increase of 11.8%, or $7.9 million. The increase in sales was the result of increased volumes driven by the ongoing recovery from the COVID-19 pandemic as well as the prior year fourth quarter being impacted by a GM strike that did not repeat in the fourth quarter of 2020. GAAP income from operations for the fourth quarter of 2020 was $4.6 million, compared to loss from operations of $0.6 million in the fourth quarter of 2019. Adjusted income from operations for the fourth quarter of 2020 was $6.8 million, compared to $1.5 million of adjusted income from operations in the fourth quarter of 2019. The improvements in both GAAP and adjusted income from operations were primarily due to the increase in net sales, improved efficiencies, and cost controls.

Power Solutions

Net sales for the fourth quarter of 2020 were $44.0 million, compared to $43.6 million in the fourth quarter of 2019, an increase of $0.4 million, or 0.8%. The increase in sales was driven by an increase in precious metal pricing, partially offset by lower overall demand due to the impact of COVID-19 on our customer’s volumes. GAAP income from operations for the fourth quarter of 2020 was $1.8 million, compared to income from operations of $1.0 million in the fourth quarter of 2019. Adjusted income from operations for the quarter was $5.1 million, compared to $5.8 million in the fourth quarter of 2019. The reduction in adjusted income from operations was due primarily to the impact of the precious metals commodity price increases (gold and silver), which are passed through at a lower margin along with lower customer volume due to COVID-19.

Full-Year Results

Tom DeByle, NN Senior Vice President and CFO, commented, “By almost any measure, 2020 was a noteworthy year for our company. We worked to overcome the adverse impact of the COVID-19 pandemic while making significant progress on our business transformation. Throughout the year, we executed on our initiatives to conserve cash and improve our operating performance. By far, the largest accomplishment during the year was the sale of our Life Sciences Group for $825 million, including a potential $70 million earnout based on 2022 performance. The cash received from the sale was used to significantly reduce our debt levels and provide a stronger foundation upon which we will build our Mobile and Power Solutions businesses where we see a great potential for long-term growth and profitability.”

Key highlights from the year include:

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Veltman concluded, “We made significant progress in 2020, and we are optimistic for continued success in 2021, based on the momentum in our core markets. Today, NN is a company with strong operating performance, based on unique core technical competencies, addressing exciting, and technologically transformational industries. While COVID-19 and chip shortage uncertainties prevent us from implementing formal guidance for the coming year, we are expecting a return to pre-pandemic volumes in both of our businesses and improved adjusted EBITDA, based on the cost improvement initiatives completed over the past year. We have seen increased volume during the first two months of 2021 and are optimistic that we can continue the operational momentum in the coming year.”

Conference Call

NN will discuss its results during its quarterly investor conference call on March 12, 2021, at 9:00 a.m. ET. The call and supplemental presentation may be accessed via NN’s website, www.nninc.com. The conference call can also be accessed by dialing 1-877-317-6789 or 1-412-317-6789, Conference ID: 10152502. For those who are unavailable to listen to the live broadcast, a replay will be available shortly after the call until March 26, 2021.

NN discloses in this press release the non-GAAP financial measures of adjusted income from operations, adjusted EBITDA, adjusted net income (loss), and adjusted net income per diluted share. Each of adjusted income from operations, adjusted EBITDA, adjusted net income (loss), and adjusted net income per diluted share provides supplementary information about the impacts of restructuring and integration expense, acquisition and transition expenses, foreign exchange impacts on inter-company loans, amortization of intangibles and deferred financing costs, and other non-operating impacts on our business.

The financial tables found later in this press release include a reconciliation of adjusted income from operations, adjusted operating margin, adjusted EBITDA, adjusted EBITDA margin, adjusted net income (loss), adjusted net income (loss) per diluted share to the U.S. GAAP financial measures of income from operations, net income (loss), and net income (loss) per diluted share.

About NN, Inc.

NN, Inc., a diversified industrial company, combines advanced engineering and production capabilities with in-depth materials science expertise to design and manufacture high-precision components and assemblies for a variety of markets on a global basis. Headquartered in Charlotte, North Carolina, NN has 32 facilities in North America, 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, the impacts of the coronavirus (COVID-19) pandemic on the Company’s financial condition, business operations and liquidity, 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,

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statements made herein and elsewhere regarding pending and completed transactions are also forward-looking statements, including statements relating to 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, 2019, the Company’s Quarterly Report on Form 10-Q for the three months ended September 30, 2020, and, when filed, the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2020. 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.

FOR FURTHER INFORMATION:

Jeff Tryka, CFA

Investor Relations Contact

jtryka@lambert.com

(616) 258-5766

Financial Tables Follow

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NN, Inc.

Consolidated Statements of Operations and Comprehensive Income (Loss)

(Unaudited)

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NN, Inc.

Consolidated Balance Sheets

(Unaudited)

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NN, Inc.

Consolidated Statements of Cash Flows

(Unaudited)

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Reconciliation of GAAP Income from Operations to Non-GAAP Adjusted Income from Operations

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Reconciliation of GAAP Income from Operations to Non-GAAP Adjusted Income from Operations

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Reconciliation of Net Income (Loss) to Non-GAAP Adjusted EBITDA

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Reconciliation of Net Income (Loss) to Non-GAAP Adjusted EBITDA

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Reconciliation of Net Income (Loss) to Non-GAAP Adjusted Net Income (Loss) and Net Income (Loss) per Diluted Share to Non-GAAP Adjusted Net Income (Loss) per Diluted Share

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Reconciliation of Net Income (Loss) to Non-GAAP Adjusted Net Income (Loss) and Net Income (Loss) per Diluted Share to Non-GAAP Adjusted Net Income (Loss) per Diluted Share

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The Company discloses in this presentation the non-GAAP financial measures of adjusted income from operations, adjusted EBITDA, adjusted net income (loss), adjusted net income per diluted share, free cash flow and net debt. Each of these non-GAAP financial measures provides supplementary information about the impacts of acquisition, divestiture and integration related expenses, foreign-exchange impacts on inter-company loans, reorganizational and impairment charges. Over the past five years, we have completed seven acquisitions, two of which were transformative for the Company, and sold two of our businesses. The costs we incurred in completing such acquisitions, including the amortization of intangibles and deferred financing costs, and these divestitures have been excluded from these measures because their size and inconsistent frequency are unrelated to our commercial performance during the period, and which we believe are not indicative of our ongoing operating costs. We exclude the impact of currency translation from these measures because foreign exchange rates are not under management’s control and are subject to volatility. Other non-operating charges are excluded as the charges are not indicative of our ongoing operating cost. We believe the presentation of adjusted income from operations, adjusted EBITDA, adjusted net income (loss), adjusted net income per diluted share, free cash flow and net debt provides useful information in assessing our underlying business trends and facilitates comparison of our long-term performance over given periods.

The non-GAAP financial measures provided herein may not provide information that is directly comparable to that provided by other companies in the Company’s industry, as other companies may calculate such financial results differently. The Company’s non-GAAP financial measures are not measurements of financial performance under GAAP and should not be considered as alternatives to actual income growth derived from income amounts presented in accordance with GAAP. The Company does not consider these non-GAAP financial measures to be a substitute for, or superior to, the information provided by GAAP financial results.

(a) Non-GAAP Adjusted income from operations represents GAAP income from operations, adjusted to exclude the effects of restructuring and integration expense; non-operational charges related to acquisition and transition expense, intangible amortization costs for fair value step-up in values related to acquisitions, non-cash impairment charges, and when applicable, our share of income from joint venture operations. We believe this presentation is commonly used by investors and professional research analysts in the valuation, comparison, rating, and investment recommendations of companies in the industrial industry. We use this information for comparative purposes within the industry. Non-GAAP adjusted income from operations is not a measure of financial performance under GAAP and should not be considered as a measure of liquidity or as an alternative to GAAP income from operations.

(b) Non-GAAP adjusted EBITDA represents GAAP net income (loss), adjusted to include income taxes, interest expense, interest rate swap payments and change in fair value, change in fair value of preferred stock derivatives and warrants, depreciation and amortization, charges related to acquisition and transition costs, non-cash stock compensation expense, foreign exchange gain (loss) on inter-company loans, restructuring and integration expense, costs related to divested businesses and litigation settlements, income from discontinued operations, and non-cash impairment charges, to the extent applicable. We believe this presentation is commonly used by investors and professional research analysts in the valuation, comparison, rating, and investment recommendations of companies in the industrial industry. We use this information for comparative purposes within the industry. Non-GAAP adjusted EBITDA is not a measure of financial performance under GAAP and should not be considered as a measure of liquidity or as an alternative to GAAP income (loss) from continuing operations.

(c) This line item reflects the aggregate tax effect of all nontax adjustments reflected in the respective table. NN, Inc. estimates the tax effect of the adjustment items identified in the reconciliation schedule above by applying the applicable statutory rates by tax jurisdiction unless the nature of the item and/or the tax jurisdiction in which the item has been recorded requires application of a specific tax rate or tax treatment.

(d) Non-GAAP adjusted net income (loss) represents GAAP net income (loss) adjusted to exclude the tax-affected effects of charges related to acquisition and transition costs, foreign exchange gain (loss) on inter-company loans, restructuring and integration charges, amortization of intangibles costs for fair value step-up in values related to acquisitions and amortization of deferred financing costs, non-cash impairment charges, interest rate swap payments and change in fair value, change in fair value of preferred stock derivatives and warrants, costs related to divested businesses and litigation settlements, and income from discontinued operations. We believe this presentation is commonly used by investors and professional research analysts in the valuation, comparison, rating, and investment recommendations of companies in the industrial industry. We use this information for comparative purposes within the industry. Non-GAAP adjusted income (loss) from segment operations is not a measure of financial performance under GAAP and should not be considered as a measure of liquidity or as an alternative to GAAP income (loss) from continuing operations.

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