Thanks, Chuck, and good afternoon, again, everyone. As of June 30, 2023, Aethlon Medical had a cash balance of approximately $12.9 million. During the first quarter ended June 30, 2023, we raised net proceeds of approximately $1.1 million under the at-the-market agreement with H.C. Wainwright.
Now some of you that listened to our previous quarterly calls have gently encouraged me not to cover our expenses in such a granular basis. So I'll try to keep my remarks a bit more high level this quarter. You can find detailed expense information and financial statements attached to our earnings release that just hit the wire or in our soon-to-be filed report on 10-Q.
Our consolidated operating expenses for the 3 months ended June 30, 2023, were approximately $3.4 million compared to $2.9 million for the 3 months ended June 30, 2022. This increase of approximately $0.5 million or 17.3% in the 2023 period was due to increases in general and administrative expenses of approximately $276,000, professional fees of $133,000 and in payroll and related expenses of approximately $91,000.
The $276,000 increase in G&A expenses was primarily due to a combination of factors. Those factors included a $344,000 increase in the purchase of raw materials for the production of the company's Hemopurifier, a $133,000 increase related to our Australian subsidiary's activities and a $105,000 increase in depreciation and equipment maintenance associated with leasehold improvements and new equipment for manufacturing and lab facilities. Those increases were partially offset by a $160,000 decrease in clinical trial expenses and a $140,000 decrease in subcontract expense associated with our former government contracts.
The $133,000 increase in professional fees was due to an increase of $123,000 in investor relations expenses associated with facilitating investor awareness and assistance with more widespread dissemination of company news, an increase of $37,000 increase associated with accounting and legal services for our new Australian subsidiary and $86,000 of legal expenses associated with year-end filings and general corporate matters. Those increases were offset by decreases in regulatory services of $85,000 and recruiting expense of $28,000.
And the $91,000 increase in payroll expense was due to a $56,000 increase in salary expense related to an increase in headcount and a $35,000 increase in stock-based compensation related to employee stock option grants.
As a result of the factors that I just noted, the company's net loss increased to approximately $3.3 million in the 3 months ended June 30, 2023, from approximately $2.9 million in the 3 months ended June 30, 2022.
We included these earnings results and related commentary in a press release issued earlier this afternoon. That release included the balance sheet for June 30, 2023, and the statements of operations for the 3 months ended June 30, 2023 and 2022. We will file our quarterly report on Form 10-Q following this call. Our next earnings call for the fiscal second quarter ending September 30, 2023, will coincide with the filing of our quarterly report on Form 10-Q in November 2023.
And now Chuck, Steve and I would be happy to take any questions that you may have. Operator, please open the call for questions.