O Shaughnessy Asset Management LLC boosted its position in iShares National Muni Bond ETF (NYSEARCA:MUB – Free Report) by 35.2% in the third quarter, Holdings Channel.com reports. The firm owned 78,511 shares of the exchange traded fund’s stock after buying an additional 20,424 shares during the quarter. O Shaughnessy Asset Management LLC’s holdings in iShares […]