Also, the ProShares UltraShort 20+ Year Treasury ETF (NYSEArca:TBT), the world's biggest leveraged fund, has gained almost 10 percent this year. TBT delivers twice the inverse of its index's daily performance. ProShares, the world's biggest purveyor of inverse and leveraged exchange-traded funds, today rolled out what it called the first geared ETF focused on the Treasury inflation-protected securities market.