Strong Tower Advisory Services boosted its stake in iShares 20+ Year Treasury Bond ETF (NASDAQ:TLT – Free Report) by 15.4% during the 1st quarter, HoldingsChannel.com reports. The fund owned 207,051 shares of the exchange traded fund’s stock after purchasing an additional 27,700 shares during the period. iShares 20+ Year Treasury Bond ETF makes up 3.4% […]