Investors have upped their interest in actively managed bond ETFs, pouring record capital into them in January as some paid up in hopes of stronger returns.

Vanguard Group (VOO), one of the world's largest ETF issuers, announced it is reducing fees on 168 mutual funds and ETF-related share classes, potentially saving investors over $350 million this year.

Vanguard, the world’s second-largest ETF issuer, recently announced its largest fee cuts in its 50-year history. The company has reduced fees

As one of the world’s largest asset managers, Vanguard’s move will pass on significant savings to investors while also putting significant margin pressure on ETF competitors. However, the implications for the ETF industry will vary by ETF category.

Vanguard on Monday announced reductions to the management fees of 87 investment funds, reportedly the largest such cuts in company history.