The muni bond ETF world shook this morning with news that J.P. Morgan Asset Management (JPMAM) has merged a key muni bond fund into an existing muni bond ETF. That makes the ETF the largest active muni bond ETF in the U.S., with $5.8 billion in AUM. The JPMorgan National Municipal Income Fund merged into the JPMorgan Municipal ETF (JMUB) as of this morning. See more: Adding Municipal Bonds? Don't Ignore Active ETFs The move comes as more and more asset managers are fully embracing the ETF wrapper for fixed ...