As we make additional investments, we generate additional availability to the extent such investments are eligible to be placed into the borrowing base. The revolving period of the Facility extends through March 2015, with an additional two-year amortization period, with distributions allowed after the completion of the revolving period. Interest on borrowings under the Facility is one-month Libor plus 275 basis points, with no minimum Libor floor. The Facility continues to carry a high-investment-grade Moody's rating of Aa3.
We also have significantly diversified our counterparty risk. The current count of 17 institutional lenders in our Facility compares to five lenders at June 30, 2010.
In addition, our repeat issuance in the 5-year to 30-year unsecured term debt market has extended our liability duration, thereby better matching our assets and liabilities for balance sheet risk management.
On December 21, 2010, we issued $150.0 million in principal amount of 6.25% senior unsecured convertible notes, convertible at $11.35 per common share and due December 2015 ("2015 Converts").
On February 18, 2011, we issued $172.5 million in principal amount of 5.50% senior unsecured convertible notes, convertible at $12.76 per common share and due August 2016 ("2016 Converts"). In the March 2012 quarter, we repurchased $5.0 million of our 2016 Notes.
On April 16, 2012, we issued $130.0 million in principal amount of 5.375% senior unsecured convertible notes, convertible at $11.65 per common share and due October 2017 ("2017 Converts").
On August 14, 2012, we issued $200.0 million in principal amount of 5.75% senior unsecured convertible notes, convertible at $12.14 per common share and due March 2018 ("2018 Converts").
On December 21, 2012, we issued $200.0 million in principal amount of 5.875% senior unsecured convertible notes, convertible at $12.54 per common share and due January 2019 ("2019 Converts", and together with the 2015 Converts, 2016 Converts, 2017 Converts, and 2018 Converts, the "Convertible Notes").
On February 16, 2012, we entered into a Selling Agent Agreement for our issuance and sale from time to time of senior unsecured program notes (the "Program Notes"). Since initiating the program, we have issued $263.6 million of Program Notes. These notes were issued with interest rates ranging from 4.00% to 7.00% with a weighted average rate of 5.71%. These notes mature between June 15, 2019 and May 15, 2043.
On May 1, 2012, we issued $100.0 million in principal amount of 6.95% senior unsecured notes due November 2022 (the "2022 Baby Bond Notes). The 2022 Baby Bond Notes trade on the New York Stock Exchange with ticker PRY and further demonstrate our diversified access to longer-dated funding.
On March 15, 2013, we issued $250 million in aggregate principal amount of 5.875% senior unsecured notes due March 2023 (the "2023 Notes", and together with our 2022 Baby Bond Notes, Convertible Notes, and our Program Notes, the "Unsecured Notes").
The Unsecured Notes are general unsecured obligations of Prospect, with no financial covenants, no technical cross default provisions, and no payment cross default provisions with respect to our revolving credit facility. The Unsecured Notes have no restrictions related to the type and security of assets in which Prospect might invest. These Unsecured Notes have an investment-grade S&P rating of BBB. As of March 31, 2013, Prospect held more than $3.3 billion of unencumbered assets on its balance sheet to benefit holders of Unsecured Notes and Prospect shareholders.
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