Thanks, Tanner, and good afternoon, everyone.
Beginning with AINV's statement of operations. Total investment income was $55 million for the quarter, up 3.9% quarter-over-quarter, reflecting higher fee income and prepayment income as well as higher interest income, partially offset by lower dividends. Prepayment income was $4 million, up $700,000 for the quarter. Fee income was $1.6 million, up $600,000 for the quarter. The increase in interest income was attributable to a larger average investment portfolio. Dividend income was $500,000 for the quarter, a decrease of $2.3 million compared to the September quarter.
We received a $2.7 million cash distribution from MC, one of our shipping investments, which was recorded as a return of capital during the period. The weighted average yield at cost on our corporate lending portfolio was 7.6% at the end of December, unchanged quarter-over-quarter. The weighted average spread of our corporate lending portfolio was 605 basis points compared to 602 basis points last quarter.
Expenses for the quarter were $32.5 million, up $800,000 for the quarter and included an incentive fee of $5.4 million. The increase in interest expense reflects the growth in the portfolio.
Net investment income per share for the December quarter was $0.35. Net leverage at the end of December was 1.52x, up slightly from last quarter, as the average net leverage for the December quarter was 1.51x compared to 1.46x for the September quarter.
On Page 16 in the earnings supplement, we disclosed the net gain and loss by strategy over the past 5 quarters. During the current quarter, our corporate lending portfolio had a net gain of $3.7 million or $0.06 per share. Merx had a net gain of $3.4 million or $0.05 per share. Noncore and legacy assets had a loss of $9.1 million or $0.14 per share, driven by losses on our shipping investments. The loss on shipping primarily relates to the sale of the 3 ships that closed in January.
NAV per share at the end of December was $16.08, a $0.01 increase quarter-over-quarter. The $0.01 increase was attributable to a $0.05 per share accretive impact from stock buybacks, partially offset by the $0.03 per share net loss on the portfolio and the $0.01 from distribution relative to net investment income.
Moving to stock buybacks. During the quarter, AINV purchased approximately 955,000 shares at an average price of $12.99, including commissions, for a total cost of $12.4 million. Since the end of the quarter and through yesterday, AINV had purchased an additional 61,000 shares at an average price of $12.70 for a total cost of approximately $800,000, leaving us with $5.8 million available under the previous authorization. As Howard mentioned, our Board has increased our share repurchase authorization by $25 million, which increases the amount available for future stock repurchases of just over $30 million.
This concludes our prepared remarks, and please open the call to questions.