State Street SPDR Portfolio Ultra Short T-Bill ETF(AMEX:SPTU)

SPTU is a passively managed ETF that provides exposure to ultra-short term Treasury bills. The fund tracks an index of public obligations of the US Treasury bills that have remaining maturities of greater than or equal to one month and less than 12 months. The fund considers USD-denominated T-bills denominated and excludes those issued or marketed primarily to retail investors. The fund employs a sampling strategy, which means the fund may not purchase all securities in the index but may instead purchase a subset of securities with similar risk and return characteristics. The index is weighted by market capitalization, rebalanced on the last calendar day of every month.