Robert Ladd
Analyst · National Securities
Okay. Thank you very much, Todd. I'd like to now cover the following areas: Our portfolio and asset quality, liquidity, and outlook for the balance of the quarter and then discuss dividends. So with respect to portfolio and asset quality, again, I'm pleased to report that most of our portfolio companies, operations are stable and managing well in the current environment. Overall, our asset quality is stable at a 2 out of our 1 to 5 investment rating system or effectively on plan. 90% of our portfolio is rated at 2 or better or on plan or better. And therefore, 10% is the portfolio is rated at 3 or below, which is below plan.
Nonaccrual loans comprise only 1.5% of fair value of the total loan portfolio and no loans have been added to nonaccrual status since April 1. We continue to make good diversification with the largest industry sector at 18% of the total at fair value, September 30, the average investment per company is about $9.4 million, and our largest investment is $21.6 million, both numbers at fair value, and 62 of the 66 portfolio companies are backed by private equity firm.
We are seeing interesting opportunities if the world has gotten a little bit clear, and we're beginning to invest selectively. During the third quarter, we made investments in 2 new and 3 existing portfolio companies, which totaled about $19 million. We also received repayments of $40 million, including 4 full repayments and a number of partial repayments, several of which were revolver repayments. As a result, we ended the quarter with an investment portfolio at fair value of $622.4 million in 66 portfolio companies, down from $641 million at June 30.
From a capital management standpoint, working closely with our bank group, we extended the revolving period of our $230 million bank facility from March 2021, all the way to September 2024, with a final maturity of September 18, 2025. Additionally, we amended certain covenants and conditions of the facility, including an increase in the maximum allowable leverage to 1.5:1.
As of today, our remaining unfunded commitments are approximately $31 million, and we have cash and revolver capacity of approximately $63 million, and this excludes cash and debenture availability at our SBIC subsidiaries. At the SBIC subsidiary level, we have investing capacity for new investments from cash and/or debentures that are approximately $40 million. So bringing liquidity overall and meaningful capacity to make new investments.
For the balance of the fourth quarter, we estimate that we'll have new investments at least equal to the amount of repayments and equity realizations, we think that number could be as much as $30 million. And if it's helpful, we think that these repayments and realizations, if they occur, would have a positive impact on NAV over the September 30.
I'd like to conclude this morning's call by covering dividends. As a reminder, we declared a regular dividend in September for the fourth quarter of $0.25 per share and a special dividend of $0.06 per share, both payable at the end of December. This brings total declared dividends in 2020 of $1.15 per share and brings life-to-date declared dividends of $10.91 per share.
Subject to approval by our Board, we expect to be back to you regarding the first quarter dividend of 2021 by mid-January, which would return us to our normal timing for declaring dividends. In other words, in the first month of the quarter.
And with that, I'll open it up for questions. Thank you. Ryan, you may open up the Q&A session.