Jeffrey Lipson
Analyst · Oppenheimer & Company
Thanks, Jeff, and good afternoon. Summarizing our results on Slide 6. We recorded core earnings per share prior to any CECL provisions of $0.36 in the second quarter compared -- in the third quarter compared to $0.38 in the third quarter last year. Higher revenue from both the portfolio and gain on sale was partially offset by higher interest expense resulting from the recent green bond issuances. Note that for the quarter, in accordance with CECL, we increased our allowance on receivables by $2 million, primarily as a result of additional loan commitments made during the period, which resulted in core earnings per share of $0.33. On a year-to-date basis, core earnings prior to CECL provision is up 18% versus last year to $1.19 as we remain on pace to exceed the midpoint of our 3-year guidance.
I'll also note that year-to-date core net investment income increased 16% year-over-year to $67 million. This increase was despite the fact we maintained an outsized low-yielding cash balance during the second and third quarters. In addition, we recorded another quarter of solid gain on sale income, as our access to private capital remains strong, including over $18 million in the third quarter, our year-to-date gain on sale income is over $47 million. With significant year-to-date growth in both NII and gain on sale our dual revenue model continues to generate strong results despite the ongoing recession.
As we turn to Slide 7, we highlight that this continued growth we've seen in core NII has been driven in large part due to growth in our portfolio and our ability to maintain an attractive portfolio yield of 7.7% despite a low yield environment. In addition, we continue to prudently manage our leverage.
Turning to Slide 8. We display the dynamic that capital markets continue to favor clean energy and ESG companies, including Hannon Armstrong. For us, this has translated into a higher share price of our equity and tighter spreads on our debt. As of the end of the third quarter, we've nearly doubled the S&P 500 in total shareholder return over the last 5 years. In addition, our corporate debt is trading below 4%, about half the level of the S&P U.S. High-yield Energy Index.
With this attractive capital markets backdrop, we highlight our very successful recent debt issuances on Slide 9. In August, we issued $375 million of 10-year unsecured corporate green bonds at a 3.75% coupon and $144 million of 3-year convertible green bonds at a 0% coupon. Both will fund anticipated identified investment opportunities.
Our research indicates that we are one of the few dividend-paying companies ever to issue 0 coupon convertible bonds. As part of the issuance process, our BB+ credit rating was reaffirmed by both S&P and Fitch. The 10-year issuance further extends and ladders our corporate debt maturities. We continue to have no material recourse debt maturities until September 2022 when our first series of convertible bonds mature. Given these may be settled in shares, this maturity does not necessarily reflect a cash need.
Year-to-date, we've raised $1.1 billion across capital markets, which further demonstrates that all of our funding sources remain open and accessible to us even during a prolonged pandemic and recession. And finally, we have limited interest rate risk as the vast majority of our assets and liabilities are fixed rate.
On Slide 10, we provide an update on our balance sheet, which expanded to $3.3 billion in the third quarter as we continue to maintain a more liquid profile in this period with over $880 million of cash. We expect to convert a significant portion of this cash into earning investments over the next few quarters, including funding the majority of the remainder of the ENGIE portfolio by the end of this year.
Our portfolio expanded 8% to $2.2 billion this quarter as we funded assets originated in both this and previous quarters. Finally, as we continue to reduce our cost of capital, we utilize a small portion of our cash to voluntarily prepay high rate debt.
As we turn to Slide 11, our portfolio of high-quality assets have continued to perform within our expectations despite the ongoing recession. This performance is driven in part by the credit quality of our counterparties and the structure of our investments. All of our government and the vast majority of our commercial obligors enjoy investment-grade ratings.
In addition, the obligors of our residential solar assets include over 158,000 high credit quality consumers located across 22 states. And in our equity method investments, we are typically preferred in the investment structure, which reduces our exposure to any periodic underperformance.
Finally, as our portfolio has grown, and we have not witnessed an increase in credit losses, our cumulative credit losses have dropped to just 20 basis points.
In summary, even as the current recession has persisted, our earnings, liquidity and asset quality have remained resilient.
And with that, I will turn the call back over to Jeff.