rank symbol avg_daily_volume etf_name 6. TLT = 62,154 = iShares 20+ Year Treasury Bond ETF 12. HYG = 37,550 = iShares iBoxx USD High Yield Corporate Bond ETF 40. LQD = 4,414 = iShares iBoxx USD Investment Grade Corporate Bond ETF 52. TMF = 2,561 = Direxion Daily 20+ Year Treasury Bull 3X Shares 56. TBT = 2,194 = PowerShares UltraShort Lehman 20+ Year Treasury ProShares 2x Shares 57. IEF = 2,049 = iShares 7-10 Year Treasury Bond ETF