Vanguard Mid-Cap ETF $VO Stake Boosted by Chesley Taft & Associates LLC

Chesley Taft and Associates LLC lifted its stake in shares of Vanguard Mid-Cap ETF (NYSEARCA:VO) by 7.4% during the fourth quarter, according to its most recent filing with the Securities and Exchange Commission. The firm owned 31,191 shares of the company's stock after purchasing an additional 2,139 shares during the quarter. Chesley