Douglas Schirle
Analyst · the Securities and Exchange Commission. Many of these risks are currently amplified by and will continue to be amplified by or in the future may be amplified by the COVID-19 global pandemic. Additionally, I have also been asked to advise you that this conference call is being recorded today, May 7, 2020, at the request of GSI Technology.
Hosting the call today is Lee-Lean Shu, the company's Chairman, President and Chief Executive Officer. With him are Douglas Schirle and Didier Lasserre, Vice President of Sales.
I would now like to turn the conference over to Mr. Shu. Please go ahead, sir
Thank you, Didier. For the fiscal year ended March 31, 2020, we reported net loss of $10.3 million or $0.45 per diluted share, on net revenues of $43.3 million compared to net income of $163,000 or $0.01 per diluted share, on net revenues of $51.5 million in the fiscal year ended March 31, 2019. Gross margin for fiscal 2020 was 58.5% compared to 61.4% in the prior year.
Total operating expenses were $36.1 million in fiscal 2020, an increase of 13.6% from $31.8 million in fiscal 2019. Research and development expenses were $25.2 million, compared to $21.4 million in the prior fiscal year; and selling, general and administrative expenses were $10.9 million compared to $10.5 million in fiscal 2019. The increase in research and development expenses was primarily due to the development of APU, the company's AI processor, including a charge of $2.7 million during the third quarter of fiscal 2020 for purchased intellectual property that is being incorporated into the next generation of Gemini chips.
Fiscal 2020 operating loss was $10.8 million compared to an operating loss of $182,000 in the prior year. The increase in operating loss is primarily due to the decrease in revenue and gross profit and higher research and development expenses. Fiscal 2020 net loss included interest and other income of $712,000 and a tax provision of $247,000 compared to $450,000 in interest and other income and a tax provision of $105,000 a year ago.
The company reported a net loss of $3.8 million or $0.16 per diluted share, on net revenues of $8.5 million for the fourth quarter of fiscal 2020, compared to a net loss of $102,000 or $0.00 per diluted share, on net revenues of $12.7 million for the fourth quarter of fiscal 2019, and a net loss of $4.6 million or $0.20 per diluted share, on net revenues of $10 million for the third quarter of fiscal 2020.
Gross margin was 52.5% compared to 61.3% in the prior-year period and 60.2% in the preceding third quarter. The change in gross margin was primarily due to changes in the mix of products sold and the negative impact of manufacturing overhead on reduced revenues.
Total operating expenses in the fourth quarter of fiscal 2020 were $8.4 million, compared to $8.1 million in the fourth quarter of fiscal 2019 and $10.8 million in the prior quarter. Research and development expenses were 2 -- were $5.6 million compared to $5.6 million in the prior-year period and $8.2 million in the prior quarter. The decrease in R&D expenses from the prior quarter reflects a charge of $2.7 million during the third quarter of fiscal 2020 for purchased intellectual property that we are incorporating into the next generation for our Gemini chips.
Selling, general and administrative expenses were $2.8 million in the quarter ended March 31, 2020, compared to $2.6 million in the prior year and $2.6 million in the previous quarter. Fourth quarter fiscal 2020 operating loss was $3.9 million, compared to an operating loss of $365,000 in the prior year period and an operating loss of $4.7 million in the prior quarter.
Fourth quarter fiscal 2020 net loss included interest and other income of $148,000 and a tax provision of $65,000 compared to $186,000 in interest and other income and a tax benefit of $77,000 for the same period a year ago. In the preceding third quarter, net loss included interest and other income of $207,000 and a tax provision of $84,000. Total fourth quarter pre-tax stock-based compensation expense was $644,000, compared to $580,000 in the comparable quarter a year ago and $629,000 in the prior quarter.
At March 31, 2020, we had $66.6 million in cash, cash equivalents and short-term investments and $4.1 million in long-term investments, compared to $61.8 million in cash, cash equivalents and short-term investments and $90 million in long-term investments at March 31, 2019. Working capital was $70.9 million as of March 31, 2020 versus $68.6 million at March 31, 2019 with no debt.
Stockholders' equity as of March 31, 2020 was $89.6 million, compared to $93.2 million as of the fiscal year ended March 31, 2019.
Fourth quarter results were within the range of guidance provided in our last earnings release for net revenues in the range of $8.5 million to $9.5 million with gross margin of approximately 50% to 52%. Our current expectations for the upcoming quarter are net revenues in a range of $7 million to $8.8 million with gross margin of approximately 48% to 52%. We've expanded our guidance range for the upcoming quarter to reflect the impact of possible changes in customer buying patterns and communication limitations related to shelter in place restrictions that require a significant number of our customer contacts to work from home. The disruption to the marketplace that we are currently experiencing is like anything we've ever had to deal with. While we continue to monitor the business metrics that we have historically used to predict our financial performance, we are uncertain as to whether these metrics will operate consistently with our historical experience.
Operator, at this point, we'll open the call to Q&A.