Operating income for the quarter was $4.1 million as compared to $5.0 million for the same period last year, an 18% decrease. Operating income for the nine months ended March 31, 2022 was $9.6 million as compared to $11.4 million for the same period last year, a 16% decrease. Net income for the quarter was $2.9 million or $0.08 per diluted share as compared to $4.4 million or $0.12 per diluted share for the same period last year, a 34% decrease. Net income for the nine months ended March 31, 2022 increased 18% to $11.7 million or $0.32 per diluted share as compared to $9.9 million or $0.27 per diluted share in the same period last year. Both operating income and net income for the quarter were impacted by supply chain disruptions which affected hardware gross margins as well as the aforementioned increase in selling, general and administrative expenses.
Adjusted EBITDA* for the quarter was $5.2, million, or $0.14 per diluted share, as compared to $5.5 million, or $0.15 per diluted share for the same period last year, a 5% decrease. Adjusted EBITDA for the nine months ended March 31, 2022 increased 1% to $13 million or $0.35 per diluted share as compared to $12.9 million or $0.35 per diluted share in the same period last year.
Net income and earnings per share for the nine months ended March 31, 2022 all reflected Other income of $3.9 million which resulted from extinguishment of debt during the quarter ended September 30, 2021. Without such benefit, net income and earnings per share would have been $7.8 million and $0.21, respectively.
Balance Sheet Summary
At March 31, 2022, the Company had $47.4 million in cash, cash equivalents and marketable securities as compared to $40.2 million as of June 30, 2021. Working capital (defined as current assets less current liabilities) was $87.1 million at March 31, 2022 as compared with working capital of $75.8 million at June 30, 2021. Current ratio (defined as current assets divided by current liabilities) was 4.8:1 at March 31, 2022, and 4.8:1 at June 30, 2021.
Conference Call Information
Management will conduct a conference call at 11 a.m. ET today, May 9 ,2022. Interested parties may participate in the call by dialing 1-877-407-4018 or for international callers, 1-201-689-8471, about 5-10 minutes prior to the start time of 11 a.m. ET. The conference call will also be available on replay starting at 2 p.m. ET on May 9, 2022 and ending on May 16, 2022 at 11:59 p.m. ET. For the replay, please dial 1-844-512-2921 domestically, or 1-412-317-6671 for international callers, and use the replay access code 13729822. In addition, the call will be webcast and will be available on the Company's website at www.napcosecurity.com.
About NAPCO Security Technologies, Inc.
NAPCO Security Technologies, Inc., is one of the leading manufacturers and designers of high-tech electronic security devices, wireless recurring communication services for intrusion and fire alarm systems as well as a leading provider of school safety solutions, The Company consists of four Divisions: NAPCO, plus three wholly owned subsidiaries: Alarm Lock, Continental Instruments, and Marks USA. Headquartered in Amityville, New York, its products are installed by tens of thousands of security professionals worldwide in commercial, industrial, institutional, residential and government applications. NAPCO products have earned a reputation for innovation, technical excellence and reliability, positioning the Company for growth in the multi-billion dollar and rapidly expanding electronic security market. For additional information on NAPCO, please visit the Company's web site at http://www.napcosecurity.com.
Safe Harbor Statement
This press release contains forward-looking statements that are based on current expectations, estimates, forecasts and projections of future performance based on management's judgment, beliefs, current trends, and anticipated product performance. These forward-looking statements include, but are not limited to, statements relating to the impact of COVID-19 pandemic; the growth of recurring service revenue and annual run rate; the introduction of new access control and locking products; the opportunities for fire alarm products; and our ability to execute our business strategies. Actual results, performance or achievements could differ materially from those anticipated in such forward-looking statements as a result of certain factors, including those risk factors set forth in the Company's filings with the Securities and Exchange Commission, such as our annual report on Form 10-K and quarterly reports on Form 10-Q. Other unknown or unpredictable factors or underlying assumptions subsequently proving to be incorrect could cause actual results to differ materially from those in the forward-looking statements. Although we believe that the expectations reflected in the forward-looking statements are reasonable, we cannot guarantee future results, level of activity, performance, or achievements. You should not place undue reliance on these forward-looking statements. All information provided in this press release is as of today's date, unless otherwise stated, and the Company undertakes no duty to update such information, except as required under applicable law.