Callable securities: "catastrophe" calls. This will acknowledge receipt of your letter dated October 20, 1977 which has been referred to me for reply. In your letter you request an interpretation of the provisions in rules G-12 and G-15 requiring that the dollar price for transactions in callable securities effected on a yield basis be priced to the lower of price to call or price to maturity. (See rules G-12(c)(v)(I) and G-15(a)(viii))[*].

At its meeting held October 25-26, 1977, the Board confirmed that the requirements in rules G-12 and G-15 relating to pricing to call do not include "catastrophe" calls, that is, calls which occur as a result of events specified in the bond indenture which are beyond the control of the issuer. MSRB interpretation of November 7, 1977.

[*] [Currently codified at rule G-15(a)(i)(A)(5)]