Exhibit 99.1

FOR IMMEDIATE RELEASE

Sparton Corporation Reports Fiscal 2014 Third Quarter Revenue Growth of 29% and Adjusted EBITDA Growth of 120% to $8.9 Million

SCHAUMBURG, IL.—May 6, 2014—Sparton Corporation (NYSE: SPA) today announced results for the third quarter of fiscal 2014 ended March 31, 2014. The Company reported third quarter sales of $83.9 million, or an increase of 29%, from $65.1 million for the third quarter of fiscal 2013. Operating income for the third quarter of fiscal 2014 was $6.3 million compared to $2.4 million in the third quarter of fiscal 2013. Net income for the third quarter of fiscal 2014 was $4.2 million or $0.42 per share, basic and diluted compared to net income of $1.5 million, or $0.15 per share, basic and diluted in the same quarter a year ago.

Consolidated Results for the Quarters and Nine Months Ended March 31, 2014 and 2013:

Cary Wood, President & CEO, commented, “We are pleased with our continued success in this fiscal year. After nine months, we have seen a 32% increase in revenue and a 73% adjusted EBITDA improvement as compared to the same prior year period. As we enter the last quarter of the fiscal year, legacy revenue after three quarters is up 9% from the prior year with strong growth in our DSS segment as domestic and foreign sonobuoy sales are ahead of last fiscal year’s pace, and in Complex Systems where we have seen increased demand from a number of key customers. The Medical segment’s year-to-date results have held steady as programs in-sourced at two customers have been offset with increased demand at a number of customers. The remaining 23% revenue growth was realized through the acquisitions of Onyx, Creonix, Aydin, Beckwood Services and, most recently in the quarter, Aubrey Group. The results continue to reflect the successful execution of our strategic growth plan, in particular our new business development process and our approach to complementary acquisitions.”

Third Quarter Financial Highlights

Acquisition of Aubrey Group, Inc.

On March 17, 2014, the Company completed the acquisition of Aubrey Group, Inc. (“Aubrey”). The acquired business, which is part of the Medical segment and which is expected to add $8.0 million in annualized revenue, develops new products for Original Equipment Manufacturers (“OEM’”) in the Medical and Biotechnological markets. Inventors, entrepreneurs, and industry leading OEMs utilize Aubrey Group’s design and engineering teams to develop innovative solutions in a timely and cost effective manner.

“We are pleased to have acquired Aubrey Group, which will add an innovative product development offering to our portfolio, allowing us to provide enhanced services throughout the product lifecycle. A key component of our strategic vision at Sparton is to realize synergistic acquisition opportunities that add value to the core products and services in our portfolio. The Aubrey acquisition aligns tremendously with this vision. By combining our businesses, Sparton and Aubrey have the capability to enter into a new set of customer engagements that allow us to offer product design, product development, and product manufacturing more completely under one umbrella.”

Segment Results

Medical Device (“Medical”)

Included in the results for the Company’s Medical segment for the three months ended March 31, 2014 are net sales of approximately $0.3 million resulting from the acquisition of Aubrey. Excluding these sales, legacy Medical sales decreased approximately $2.2 million, or 6%, in the three months ended March 31, 2014 as compared with the prior year quarter. This comparative decrease primarily reflects a rebalancing of Fenwal program engagements with the Company beginning in the Company’s fiscal 2014 third quarter. The rebalancing of this customer’s programs is expected to negatively affect comparative sales to this customer by approximately $7 million in the Company’s fiscal 2014 fourth quarter and as much as $19 million in the Company’s fiscal 2015, substantially all of which will be realized during first half of that year.

Gross margin on Medical sales increased to 14.3% from 13.6% for the three months ended March 31, 2014 and 2013, respectively. This increase in margin percentage on Medical sales primarily reflects certain favorable product mix between the two periods.

Selling and administrative expenses relating to the Medical segment were $2.4 million for the three months ended March 31, 2014 compared to $2.2 million for the three months ended March 31, 2013, primarily reflecting incremental allocated expenses related to Onyx operations. Amortization of intangible assets was $0.5 million and $0.6 million for the three months ended March 31, 2014 and 2013, respectively. The Medical segment reported operating income of $2.5 million for each of the quarters ended March 31, 2014 and 2013 respectively.

Complex Systems (“CS”)

Included in the results for the Company’s Complex Systems segment for the three months ended March 31, 2014 are net sales of approximately $7.5 million resulting from the acquisitions of Creonix, LLC (“Creonix”) and Beckwood. Excluding these sales and an increase in intercompany sales of $1.0 million, CS sales to legacy external customers for the three months ended March 31, 2014 decreased $1.4 million, or 12%, as compared with the same quarter last year. This comparative decrease primarily reflects a sales delay in the current year quarter with one customer as it makes engineering design changes.

Gross margin on CS sales decreased to 10.6% for the three months ended March 31, 2014 compared to 11.5% for the three months ended March 31, 2013, primarily reflecting unfavorable product mix between the comparative periods.

Selling and administrative expenses relating to the CS segment were $1.1 million and $0.7 million for the three months ended March 31, 2014 and 2013, respectively, primarily due to the inclusion of operating expenses of Creonix and Beckwood. Amortization of intangible assets was $0.5 million for the three months ended March 31, 2014 due to the acquisitions of Creonix and Beckwood. CS reported operating income of $0.9 million for the quarter ended March 31, 2014 compared to operating income of $1.2 million in the prior year quarter. CS adjusted operating income was $1.0 million compared to operating income of $1.2 million in the prior year quarter.

Defense & Security Systems (“DSS”)

Included in the results for the Company’s Defense and Security Systems segment for the three months ended March 31, 2014 are net sales of approximately $4.1 million resulting from the acquisition of Aydin. Excluding the fiscal year 2014 incremental sales from the acquisition of Aydin, DSS legacy sales increased approximately $10.6 million, or 75%, in the three months ended March 31, 2014 as compared with the same quarter last year, reflecting increased sonobuoy sales to the U.S. Navy and foreign governments, as well as increased U.S Navy engineering sales.

Gross margin percentage on DSS sales increased to 29.8% for the three months ended March 31, 2014 compared to 20.4% for the three months ended March 31, 2013. Gross profit percentage was positively affected in the current year quarter by increased volume as well as favorable product mix as compared to the prior year quarter.

Selling and administrative expenses relating to the DSS segment were $2.2 million and $1.2 million for the three months ended March 31, 2014 and 2013, respectively, reflecting incremental expenses related to Aydin operations. The Company incurred $0.2 million and $0.3 million of internally funded research and development expenses in the three months ended March 31, 2014 and 2013, respectively. DSS reported operating income of $6.1 million for the quarter ended March 31, 2014 compared to operating income of $1.4 million in the prior year quarter. DSS adjusted operating income was $6.2 million compared to operating income of $1.4 million in the prior year quarter.

Liquidity and Capital Resources

As of March 31, 2014, the Company had $35.0 million borrowed and approximately $29 million available under its credit facility and had available cash and cash equivalents of $7.5 million. As of this date, the Company had received performance based payments under U.S. Navy contracts in excess of the funding of production to date under those contracts of $7.4 million.

Mr. Wood commented, “As we continue to see an increased number of opportunities, not only in number, but also in size, our remaining credit facility availability, coupled with the facility’s potential $35 million accordion feature, provides the Company with flexibility as we continue to pursue strategic acquisitions as part of our growth plan.”

Outlook

Cary Wood concluded, “The third quarter’s strong results build upon the success of the first two quarters of the fiscal year. As in prior years, we can experience revenue fluctuations within our reporting segments on a quarter-over-quarter basis. Our focus continues to be on managing the overall business, not only on the top line with revenue performance, but more importantly, the flow through of that revenue as adjusted EBITDA. As in prior quarters, we continue to execute our strategic growth plan to meet our growth expectations by focusing on new business development, internal product research and development, and compatible and complementary acquisitions. We are experiencing positive momentum from our new business development process with additional new business wins, increased inclusion of our inertial navigation sensors in key military projects and engineering wins from the sale of those products. The acquisition of synergistic entities remains a priority as evidenced by the closing of the Aubrey Group transaction that provides us with further product development capabilities and regional presence on the West Coast. As we look forward, we expect the fourth quarter will produce results at or above our current performance levels, adding to what has been an excellent fiscal year.”

Conference Call

Sparton will host a conference call with investors and analysts on May 7, 2014 at 10:00 a.m. CDT/11:00 a.m. EDT to discuss its fiscal year 2014 third quarter financial results, provide a general business update, and respond to investor questions. To participate, callers should dial (800) 706-9230. Participants should dial in at least 15 minutes prior to the start of the call. A Web presentation link is also available for the conference call: https://www.livemeeting.com/cc/gc_min_pro_usa/join?id=4RSNBJ&role=attend

Investors and financial analysts are invited to ask questions after the presentation is made. The presentation and a replay of the call will be available on Sparton’s Web site: http://www.sparton.com in the “Investor Relations” section for up to two years after the conference call.

Non-GAAP Financial Measures

In addition to reporting financial results in accordance with U.S. generally accepted accounting principles (“GAAP”), Sparton Corporation has provided non-GAAP financial measures as additional information for its operating results. These measures have not been prepared in accordance with GAAP and may be different from measures used by other companies. Whenever we use non-GAAP financial measures, we designate these measures, which exclude the effect of certain expenses and income, as “adjusted” and provide a reconciliation of non-GAAP financial measures to the most closely applicable GAAP financial measure. The non-GAAP financial measures eliminate or add certain items of expense and income from cost of goods sold, total operating expense, other income (expense) and provision for (benefit from) income taxes. Management believes that this presentation is helpful to investors in evaluating the current operational and financial performance of our business and facilitates comparisons to historical results of operations. Management discloses this information along with a reconciliation of the comparable GAAP amounts to provide access to the detail and nature of adjustments made to GAAP financial results. While some of these excluded items have been periodically reported in our statements of operations, including significant restructuring and impairment charges as well as certain gains on sales of assets, their occurrence in future periods depends on future business and economic factors, among other evaluation criteria, and the occurrence of such events and factors may frequently be beyond the control of management.

We exclude restructuring/impairment charges, gross profit effects of capitalized profit in inventory from acquisition and acquisition contingency settlement, and gain on sale of investment, the related tax effect of these items as well as unusual discrete tax benefits or expense because we believe that they are not related directly to the underlying performance of our fundamental business operations. We exclude these measures when reviewing financial results and for business planning. Although these events are reflected in our GAAP financials, these transactions may limit the comparability of our fundamental operations with prior and future periods.

Adjusted EBITDA represents earnings before interest, taxes, depreciation and amortization as adjusted for restructuring/impairment charges, gross profit effects of capitalized profit in inventory from acquisition and acquisition contingency settlement, and gain on sale of investment. The Company believes Adjusted EBITDA is commonly used by financial analysts and others in the industries in which the Company operates and, thus, provides useful information to investors. The Company does not intend, nor should the reader consider, Adjusted EBITDA an alternative to operating income, net income, net cash provided by operating activities or any other items calculated in accordance with GAAP. The Company’s definition of Adjusted EBITDA may not be comparable with Adjusted EBITDA as defined by other companies. Accordingly, the measurement has limitations depending on its use.

About Sparton Corporation

Sparton Corporation (NYSE:SPA), now in its 114th year, is a provider of complex and sophisticated electromechanical devices with capabilities that include concept development, industrial design, design and manufacturing engineering, production, distribution, and field service. The primary market classifications served are Navigation & Exploration, Defense & Security, Medical, and Complex Systems. Headquartered in Schaumburg, IL, Sparton currently has six manufacturing locations worldwide. Sparton’s Web site may be accessed at http://www.sparton.com.

Safe Harbor and Fair Disclosure Statement

Certain statements described in this press release are forward-looking statements within the scope of the Securities Act of 1933, as amended (the “Securities Act”), and the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Forward-looking statements may be identified by the words “believe,” “expect,” “anticipate,” “project,” “plan,” “estimate,” “will” or “intend” and similar words or expressions. These forward-looking statements reflect Sparton’s current views with respect to future events and are based on currently available financial, economic and competitive data and its current business plans. Actual results could vary materially depending on risks and uncertainties that may affect Sparton’s operations, markets, prices and other factors. Important factors that could cause actual results to differ materially from those forward-looking statements include, but are not limited to, Sparton’s financial performance and the implementations and results of its ongoing strategic initiatives. For a more detailed discussion of these and other risk factors, see Part I, Item 1A, Risk Factors and Part II, Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operations, in Sparton’s Form 10-K for the year ended June 30, 2013, and its other filings with the Securities and Exchange Commission. Sparton undertakes no obligation to publicly update or revise any forward-looking statement as a result of new information, future events or otherwise, except as otherwise required by law.

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