BTIG analyst Mark Palmer said that U.S. District Court Judge Laura Taylor Swain's rejection of the financial oversight board's effort to prime the bondholders of the Puerto Rico Electric Power Authority, or PREPA, is a "huge" positive for municipal bond insurers Assured Guaranty (AGO) and MBIA (MBI). Each have significant insured exposure to PREPA's debt and the rejection of PREPA's effort to gain approval for a $1B DIP loan issued by the Puerto Rico government that would have primed the utility's bondholders was a big win, said Palmer. He also believes the ruling had broader implications for them and fellow municipal bond insurer Ambac Financial (AMBC), which has no insured exposure to PREPA but still filed a motion opposing the DIP loan. MBIA shares are up 6.8% in early trading while Assured Guaranty is up about 3.8%.