Thank you, Jay. I'd like to remind you that our typical contract period for reinsurance contract is from June 1 to May 31 of the following year.
Our cash and cash equivalents and restricted cash and cash equivalents increased to $4.3 million at March 31, 2024, compared to $3.7 million at December 31, 2023.
Net premiums earned for the quarter ended March 31, 2024, increased to $549,000 compared to $0 in last year's first quarter. The increase is due to the contracts in force during the quarter ended March 31, 2024, as opposed to the prior period in which premiums were accelerated prior to the quarter ended March 31, 2023, as a result of losses incurred from Hurricane Ian. There have been no losses incurred to date in 2024.
Our net investment and other income decreased in the quarter to $62,000 from $89,000 in the prior year's first quarter. We also recorded an unrealized loss of $688,000 on our other investments, the result of our remeasurement of our investment in Jet.AI at fair value. We also recognized an $89,000 negative change in the fair value of our equity securities as of March 31, 2024, decreasing from $76,000 positive change in the prior year first quarter. All of these factors taken together resulted in total revenues of negative $125,000 for 3 months ending March 31, 2024, compared to $546,000 in the prior year's first quarter.
Total expenses, including loss and loss adjustment expenses, policy acquisition costs and general and admin expenses were up in the first quarter of 2024 to $548,000 from $404,000 last year. The increase in 2024 was due to higher professional and legal expenses incurred during the 3-month period ended March 31, 2024, as well as no policy acquisition costs recorded in the prior period.
Primarily due to the negative change in the fair value of our equity securities and investment in Jet.AI, during the quarter, we generated a net loss of $905,000 or $0.15 per share for the 3 months ended March 31, 2024, compared to net income of $142,000 or $0.02 per share in last year's first quarter.
As we have discussed before on our investor calls, we use various measures to analyze the growth and profitability of our business operations. For our reinsurance business, we measure underwriting profitability by examining our loss ratio, acquisition ratio, expense ratio and combined ratio. Our loss ratio, which measures underwriting profitability, is the ratio of loss and loss adjustment expenses incurred to net premiums earned. With no loss or loss adjustment expenses in either of the first quarter of 2024 or 2023, the loss ratio was 0% for both periods.
Our acquisition cost ratio, which measures operational efficiency, compares policy acquisition costs and net premiums earned. The acquisition cost ratio increased to 10.9% for the 3-month period ending March 31, 2024, from 0% for the same period last year. The increase is due primarily to premiums being earned and acquisition cost being expensed during the period ended March 31, 2024, when compared with the prior period.
Our expense ratio, which measures operating performance, compared to policy acquisition costs and general and admin expenses with net premiums earned. Our expense ratio increased to 99.3% (sic) [ 99.8% ] in the first quarter compared to 0% in the first quarter of 2023. The increase is due to higher general and admin expenses and policy acquisition costs during the first quarter of 2024.
The combined ratio, which is used to measure underwriting performance, is the sum of the loss ratio and the expense ratio. This ratio increased to 99.8% compared to 0% in the last year's first quarter. The increase is due to the higher general and administrative expenses and policy acquisition cost incurred during the first quarter of 2024.
Our investment portfolio decreased to $284,000 at March 31, 2024, from $680,000 at the prior period end, primarily the result of the sale of equity securities and a decrease in fair value of the equity securities during the quarter. Our investment decreased due to the fair value change of our investment in Jet.AI in which the company has an equity investment measured at fair value.
I'll now turn the call back over to Jay to wrap up before we take your questions. Jay?