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

The Pennsylvania-based fund giant stands to gain ground against rivals such as BlackRock while earning more goodwill from retail investors.

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