Item 3. Quantitative and Qualitative Disclosures About Market Risk
Item 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
Interest Rate Risk. We are exposed to risks associated with market changes in interest rates. Our credit facility exposes us to variability in interest payments due to changes in LIBOR interest rates. We manage our exposure to this market risk by monitoring available financing alternatives. Our mortgages and promissory notes require principal and interest payments through maturity pursuant to amortization schedules.
Our mortgages generally contain provisions that allow us to make repayments earlier than the stated maturity date. In some cases, we are not allowed to make early repayment prior to a cutoff date. Where prepayment is permitted, we are generally allowed to make prepayments only at a premium which is often designed to preserve a stated yield to the note holder. These prepayment rights may afford us opportunities to mitigate the risk of refinancing our debts at maturity at higher rates by refinancing prior to maturity.
At June 30, 2020, our subsidiaries had $30.0 million outstanding under our revolving credit facility. We have outstanding indebtedness under mortgage loans insured with Department of Housing and Urban Development (HUD) and two promissory notes to third parties of $119.6 million.
Our cash and cash equivalents as of June 30, 2020 consisted of bank term deposits, money market funds and U.S. Treasury bill related investments. In addition, as of June 30, 2020, we held debt security investments of approximately $48.9 million which were split between AA, A, and BBB rated securities. We believe our debt security investments that were in an unrealized loss position as of June 30, 2020 were not other-than-temporarily impaired, nor has any event occurred subsequent to that date, including the recent developments related to COVID-19, that would indicate any other-than-temporary impairment. Our market risk exposure is interest income sensitivity, which is affected by changes in the general level of U.S. interest rates. The primary objective of our investment activities is to preserve principal while at the same time maximizing the income we receive from our investments without significantly increasing risk. Due to the low risk profile of our investment portfolio, an immediate 10% change in interest rates would not have a material effect on the fair market value of our portfolio. Accordingly, we would not expect our operating results or cash flows to be affected to any significant degree by the effect of a sudden change in market interest rates on our securities portfolio.
The above only incorporates those exposures that exist as of June 30, 2020 and does not consider those exposures or positions which could arise after that date. If we diversify our investment portfolio into securities and other investment alternatives, we may face increased risk and exposures as a result of interest risk and the securities markets in general.
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