Puerto Rico may not be able to make debt payments By: MarketMinute.com Stock News June 29, 2015 at 13:01 PM EDT Puerto Rico's announcement that it would be not be able to pay its debts sent shares of bond insurers Assured Guaranty Ltd. (NYSE: AGO) plummeting $4.05 to $23.38 and MBIA Inc. (NYSE: MBI) falling $1.58 to $6.74. Related Stocks: Assured Guaranty Ltd MBIA Inc