GOVZ is passively managed to capture the long end of the US Treasury curve. As such investor should expect the performance to fluctuate with changes in interest rates. The fund holds a small portfolio of Treasury STRIPS with at least 25 years to maturity. STRIPS are securities that promise single payment upon maturity without any semi-annual coupons. The types of securities are sold at a discount to face value but mature at par. The underlying index is weights securities by their market value and is rebalanced quarterly.