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Timeline of U.S. Treasury Bills

Year Event
1929 Dec. 17, 1929: Regular issues of 13- week bills.
1959 Mar. 12, 1959: Regular issues of 26-week bills and 1-year bills.
1960 Completed establishment of 1-year bill cycle quarterly in addition to 3 and 6-month cycles weekly.
1962 Sept. 4, 1962: Awards to a single bidder in an auction of Treasury bills were limited to one quarter of the securities offered.
1963 June 1963: Monthly 1-year bills replaced quarterly issues of 1-year bills.
1966 Sept. 1966: 9-month bill auctions began in conjunction with regular monthly 12-month bill auctions.  Each was a reopening of an outstanding 12-month bill.
1970 Raised the minimum bill denomination from $1,000 to $10,000.
1972 Sept. 1972: Began the conversion of regular issues of end-of-month 1-year bills to regular issues of 52-week bills with offerings every 4 weeks, and a phase-out of regular issues of 9-month bills.
1974 Cash management bills were introduced to raise cash for a few days or several months. The use of STRIPS of bills and tax anticipation bills was discontinued.
1975 The maximum amount accepted on a noncompetitive basis from any one bidder for original issues of marketable bills was increased from $200,000 to $500,000.
1979 Bidders in bill auctions were required to report the amount of any net long positions in excess of $200 million in the offered bills using the tender form.
1979 Transition began to Thursday maturities for all 13, 26, and 52-week and cash management bills, and was completed in 1980.
1982 Bidding in Treasury bill auctions was converted to a bank discount yield basis, rather than a price basis. This change was made to conform the bidding in Treasury bill auctions to market pricing conventions.
1997 November 1997: Three-decimal competitive bidding, in .005 percent increments, was introduced for regular Treasury bills: 13, 26 and 52-week.
1997 The net long position reporting threshold for all bill auctions was lowered from $2 billion to $1 billion.
1998 March 3, 1998: Treasury announced that they would be issuing smaller amounts for 13-week bills relative to 26-week bills. The announcement called for $7.25 billion of 26-week bills and $6.25 of 13-week bills. Previously, the practice was to split the total amount offered evenly. The reason for the change was to maintain market liquidity in Treasury bills, while reducing the amount of cash raised.
1998 August 20, 1998: 13-and 26-week bill announcements moved from Tuesdays to Thursdays. The 52-week bill auction moved to Tuesdays. These changes were made to shorten the When-Issued (WI) Trading periods for bills.
2001 February 2001: 52-week bills eliminated after the February 27 auction.
2001 July 2001: First auction of 4-week bills.
2002 April 2002: The number of decimals for discount rates submitted in cash management bill auctions increased from two to three.
2002 December 2002: Net Long Reporting Threshold changed to 35% of the offering amount. Previously, the threshold had been $1 billion for bills and $2 billion for notes
2005 October 2005: 4-week bill became eligible for purchase in TreasuryDirect; however, this security was still not available for purchase in Legacy TreasuryDirect.
2008 June 2008: 52-week bill reintroduced.
2008 September 17, 2008: Treasury announces the introduction of the Supplementary Financing Program. This program was designed to address heightened liquidity pressures faced by the Federal Reserve. The program auctioned a series of Treasury bills, apart from Treasury’s borrowing program, that provided cash for the use of Federal Reserve Initiatives.
2008 December 2008: 4-week bill closes at 0.000%, for the first time since the Depression.