S&P assigned BlackRock’s BRSRV its highest AAAm principal stability fund rating after Monday’s official launch.BRSRV held $50 million and maintained a $1.00 NAV as of Tuesday, according to BlackRock.The fund holds cash, short-term Treasuries and overnight repurchase agreements secured by Treasury instruments exclusively.USDT remains rated five, or weak, under S&P’s separate stablecoin stability assessment framework as published.BRSRV targets stablecoin issuers seeking eligible reserves under the GENIUS Act and future federal regulations.