Principal Securities Expands Investment in BSMU ETF Principal Securities Inc. has acquired 4,476 shares of the Invesco BulletShares 2030 Municipal Bond ETF, valued at $97,000. This move reflects growing interest in municipal bond ETFs, which provide a structured maturity schedule. The ETF's performance has been steady, with a year-high of $22.34 and a low of $21.51.1