Michael Testa
Analyst · Ladenburg Thalmann
Thank you, Kyle. In Q1, we achieved record total investment income of $50.5 million, a 21.5% increase over the same period in 2023. Our effective yield on the portfolio for Q1 was once again strong at 15.8%. Our core yield, which excludes fee and prepayment income was 15.3%, mostly consistent with the prior quarter. Net investment income for the first quarter was $25.2 million or $0.54 per basic share, an increase of 30% compared to $19.3 million or $0.55 per basic share in the same period of the prior year.
Our net investment income represents 106% coverage of our quarterly distribution, and our undistributed income is approximately $55 million or $1.33 per share. Our platform continues to generate strong returns for our shareholders with ROAE based on net investment income over average equity of 16.1%, and ROAA based on net investment income over average total assets of 7.5%.
As of March 31, 2024, our NAV was $626 million, which increased from $611 million as of December 31, 2023. Our corresponding NAV per share was $12.88 per share at the end of Q1, which decreased from $13.19 per share as of December 31, 2023. The decrease in NAV per share this quarter was primarily attributed to the issuance of restricted stock award that enable us to continue to grow our platform as well as net unrealized depreciation that Gerry will discuss in more detail later in the call.
Under our ATM program in Q1, we raised approximately $24.3 million in proceeds, all at an accretive premium to NAV to fund our ongoing portfolio growth. As of March 31, 2024, we had total liquidity of $172 million, comprised of $160 million of undrawn capacity under our credit facility and $12 million in unrestricted cash and cash flow.
We continue to realize the benefits of our co-investment joint venture, which in Q1 provided $1.3 million or $0.03 per share of interest, dividend and fee income to the BDC. During the quarter, the joint venture also expanded its revolving credit facility. And as of March 31, 2024, have more than $200 million of assets under management. This off-balance sheet vehicle provides incremental capital for growth and accretive returns to our shareholders.
At the end of the quarter, we raised $115 million of unsecured notes that mature in 2029, further enhancing our balance sheet and liquidity position and extending our maturity ladder. We believe our current debt funding mix, which is currently 74% unsecured debt, is appropriate, and we remain consistent with managing the right side of the balance sheet. We intend to repay $30 million over [ $2025 million ] (sic) [ $182.5 million ] in May. Our weighted average cost of debt was in line with prior quarter at 7.4%, and we continue to benefit from low-fixed rate debt having access to unsecured market during a period of lower interest rate.
Our net leverage ratio, which represents principal debt outstanding less cash on hand, was 1.16x as of March 31. Both our strong liquidity position and the fact they were operating within our targeted leverage range provides Trinity with the flexibility to manage a strong pipeline and be opportunistic in the marketplace.
I'll now turn the call over to our COO, Gerry Harder, to discuss our portfolio performance and platform in more detail. Gerry?