Rebalance of April 30, 2026

1-12 Month constituents

Every one of the 91 holdings, with the three deductions that set its weight, both prices, and its contribution to the month. The contributions add to the published return, which is what makes a level checkable rather than something to trust.

Check it yourself

Holdings
91
Weights sum to
100.0000%
Contributions sum to
+0.308469%
Market value
$6.33tn

Both totals are added up on this page from the rows in the table below, not read from a stored figure, a total computed somewhere you cannot see would prove nothing. The check below compares that sum against the level published on the 1-12 Month page, fetched separately.

These reconcile. The holdings below sum to +0.308469% against a published month return of +0.308469%, a difference of 5.4e-8 basis points, the published rounding rather than arithmetic. That shows this level is reproducible from these holdings; it is not a check on the prices behind them, since both sides use the same ones.

How each weight is set

Par auctioned, less what Treasury has bought back and retired, less what the Federal Reserve holds, gives the float that is actually investable. The two deductions are applied in that order rather than combined: a buyback destroys the debt, while the Federal Reserve only parks it, so merging them would restore retired par the moment quantitative tightening reversed.

Every holding of the 1-12 Month index at the April 30, 2026 rebalance, heaviest first, with par and the two deductions, the float, prices, weight and contribution.
CUSIPCouponMaturesPar auctioned− Bought back− Fed held= Float parStart dirtyEnd dirtyWeightReturnContribution
912797SP30.000%May 7, 2026$257.62bn$11.31bn$246.31bn99.625999.93043.875%+0.306%+0.01184%
912797QN00.000%May 14, 2026$228.31bn$14.31bn$214.00bn99.555199.86043.365%+0.307%+0.01032%
912797QX80.000%Jun 11, 2026$223.96bn$13.21bn$210.75bn99.278099.58003.304%+0.304%+0.01005%
912797TE70.000%Jun 25, 2026$173.95bn$3.54bn$170.41bn99.140099.43692.668%+0.299%+0.00799%
912797SW80.000%May 28, 2026$172.90bn$6.91bn$165.99bn99.415299.72232.606%+0.309%+0.00805%
912797SV00.000%May 21, 2026$173.81bn$10.04bn$163.77bn99.485799.79122.573%+0.307%+0.00790%
912797TD90.000%Jun 18, 2026$175.86bn$14.61bn$161.25bn99.210099.51002.526%+0.302%+0.00764%
912797SX60.000%Jun 4, 2026$171.07bn$10.22bn$160.84bn99.348299.65002.524%+0.304%+0.00767%
912797TL10.000%May 5, 2026$164.51bn$5.98bn$158.53bn99.647199.95042.495%+0.304%+0.00759%
912797TR80.000%May 12, 2026$159.89bn$1.39bn$158.50bn99.576599.88032.493%+0.305%+0.00761%
912797TS60.000%May 19, 2026$154.78bn$10.50bn$144.28bn99.505999.81052.267%+0.306%+0.00694%
912797TT40.000%May 26, 2026$150.03bn$8.39bn$141.64bn99.435399.74142.224%+0.308%+0.00685%
912797RF60.000%Jul 9, 2026$133.85bn$6.85bn$127.00bn98.997299.30001.986%+0.306%+0.00607%
912797RS80.000%Sep 3, 2026$130.59bn$4.49bn$126.11bn98.444398.74351.961%+0.304%+0.00596%
912797RG40.000%Aug 6, 2026$133.27bn$8.18bn$125.09bn98.723699.02271.950%+0.303%+0.00591%
912797UH80.000%Sep 24, 2026$80.81bn$80.81bn98.239898.53411.254%+0.300%+0.00376%
912797TN70.000%Jul 16, 2026$79.52bn$2.52bn$77.00bn98.930099.23211.203%+0.305%+0.00367%
912797TW70.000%Aug 13, 2026$81.49bn$4.49bn$77.00bn98.646298.95001.200%+0.308%+0.00369%
912797TY30.000%Aug 27, 2026$79.89bn$2.89bn$77.00bn98.510098.81001.198%+0.305%+0.00365%
912797UG00.000%Sep 17, 2026$83.17bn$6.17bn$77.00bn98.300098.60001.195%+0.305%+0.00365%
912797TF40.000%Jul 2, 2026$81.57bn$6.04bn$75.52bn99.070099.37001.182%+0.303%+0.00358%
912797TP20.000%Jul 23, 2026$80.35bn$5.56bn$74.79bn98.860099.15771.168%+0.301%+0.00352%
912828Z781.500%Jan 31, 2027$98.52bn$1.49bn$22.08bn$74.95bn98.404998.71671.165%+0.317%+0.00369%
912797UF20.000%Sep 10, 2026$81.39bn$6.42bn$74.97bn98.370098.67371.165%+0.309%+0.00360%
912797TQ00.000%Jul 30, 2026$80.56bn$6.81bn$73.75bn98.786699.09251.151%+0.310%+0.00356%
912797TX50.000%Aug 20, 2026$80.52bn$9.30bn$71.22bn98.580098.88001.109%+0.304%+0.00337%
91282CME84.250%Dec 31, 2026$69.68bn$678.7m$69.00bn101.4121101.73311.105%+0.316%+0.00350%
91282CMP34.125%Feb 28, 2027$75.95bn$76.0m$6.95bn$68.92bn100.6712100.97621.096%+0.303%+0.00332%
91282CLP43.500%Sep 30, 2026$70.42bn$3.0m$1.42bn$69.00bn99.8846100.20271.088%+0.319%+0.00347%
912797UR60.000%Jul 28, 2026$69.73bn$69.73bn98.806799.11251.088%+0.309%+0.00337%
91282CMV03.875%Mar 31, 2027$71.04bn$259.0m$2.04bn$68.74bn100.1356100.42201.087%+0.286%+0.00311%
91282CMH14.125%Jan 31, 2027$72.83bn$1.06bn$3.83bn$67.94bn100.9650101.30681.083%+0.339%+0.00367%
91282CKY64.625%Jun 30, 2026$71.40bn$1.68bn$2.40bn$67.33bn101.3814101.67091.078%+0.286%+0.00308%
91282CLY54.250%Nov 30, 2026$73.69bn$2.92bn$4.69bn$66.08bn101.7370102.05601.062%+0.314%+0.00333%
91282CLS84.125%Oct 31, 2026$70.16bn$3.31bn$1.16bn$65.69bn101.8883100.19871.057%+0.366%+0.00387%
912797UN50.000%Jul 7, 2026$69.22bn$3.37bn$65.85bn99.017399.32001.030%+0.306%+0.00315%
91282CLB54.375%Jul 31, 2026$72.80bn$5.09bn$3.80bn$63.91bn100.9439101.24401.019%+0.297%+0.00303%
91282CLH23.750%Aug 31, 2026$74.49bn$4.81bn$5.49bn$64.19bn100.2948100.60051.017%+0.305%+0.00310%
912797UP00.000%Jul 14, 2026$69.52bn$4.85bn$64.67bn98.952999.25211.011%+0.302%+0.00306%
91282CKS94.875%May 31, 2026$73.10bn$6.86bn$4.10bn$62.14bn101.7902102.09820.999%+0.303%+0.00302%
912797TU10.000%Jun 2, 2026$69.26bn$6.49bn$62.76bn99.366599.67090.985%+0.306%+0.00302%
912797UQ80.000%Jul 21, 2026$69.48bn$6.46bn$63.02bn98.876999.18230.984%+0.309%+0.00304%
912797UB10.000%Jun 23, 2026$69.19bn$8.35bn$60.85bn99.162399.45700.953%+0.297%+0.00283%
912797UA30.000%Jun 16, 2026$69.18bn$9.58bn$59.61bn99.230099.53000.934%+0.302%+0.00282%
912797TZ00.000%Jun 9, 2026$69.20bn$10.08bn$59.12bn99.300099.60000.927%+0.302%+0.00280%
912797UC90.000%Jun 30, 2026$70.19bn$11.31bn$58.88bn99.087599.38830.921%+0.304%+0.00280%
91282CDK41.250%Nov 30, 2026$63.86bn$2.10bn$4.96bn$56.80bn98.762799.08450.886%+0.326%+0.00289%
91282CDG31.125%Oct 31, 2026$67.20bn$615.0m$9.95bn$56.64bn98.941198.72180.885%+0.347%+0.00307%
91282CCZ20.875%Sep 30, 2026$68.35bn$100.0m$11.51bn$56.73bn98.596198.91790.883%+0.326%+0.00288%
91282CKE04.250%Mar 15, 2027$56.00bn$553.0m$55.45bn100.6651100.94900.881%+0.282%+0.00249%
91282CDQ11.250%Dec 31, 2026$64.74bn$1.25bn$7.74bn$55.76bn98.470598.79280.867%+0.327%+0.00284%
9128282A71.500%Aug 15, 2026$65.36bn$952.0m$10.76bn$53.64bn99.342799.65450.842%+0.314%+0.00264%
91282CCP40.625%Jul 31, 2026$66.84bn$2.74bn$11.19bn$52.91bn99.072399.40540.828%+0.336%+0.00278%
91282CJT94.000%Jan 15, 2027$52.00bn$878.0m$51.12bn101.0273101.35880.816%+0.328%+0.00268%
91282CCJ80.875%Jun 30, 2026$70.26bn$18.42bn$51.84bn99.501299.82370.815%+0.324%+0.00264%
91282CCW90.750%Aug 31, 2026$68.66bn$8.32bn$8.34bn$52.00bn98.846599.15760.812%+0.315%+0.00256%
91282CKA84.125%Feb 15, 2027$57.99bn$3.12bn$3.99bn$50.88bn100.8253101.13590.810%+0.308%+0.00250%
91282CCF60.750%May 31, 2026$72.84bn$7.61bn$14.04bn$51.19bn99.7514100.06320.806%+0.313%+0.00252%
91282CJP74.375%Dec 15, 2026$50.00bn$50.00bn101.7236102.05290.803%+0.324%+0.00260%
91282CEF42.500%Mar 31, 2027$60.49bn$450.0m$9.49bn$50.55bn98.788199.08670.789%+0.302%+0.00238%
91282CEC11.875%Feb 28, 2027$62.08bn$3.03bn$9.05bn$49.99bn98.475598.78460.777%+0.314%+0.00244%
912828R361.625%May 15, 2026$69.50bn$2.63bn$18.77bn$48.10bn100.3650100.65590.762%+0.290%+0.00221%
912797UD70.000%Mar 18, 2027$54.01bn$4.01bn$50.00bn96.538796.81580.762%+0.287%+0.00219%
912797TM90.000%Jan 21, 2027$52.17bn$2.75bn$49.42bn97.114097.38430.758%+0.278%+0.00211%
91282CJK84.625%Nov 15, 2026$48.91bn$1.08bn$913.4m$46.92bn102.2503102.60240.758%+0.344%+0.00261%
912797TC10.000%Dec 24, 2026$52.30bn$4.56bn$47.74bn97.372197.65310.734%+0.289%+0.00212%
912828U242.000%Nov 15, 2026$69.14bn$4.86bn$17.85bn$46.44bn99.6632100.01640.731%+0.354%+0.00259%
912797TV90.000%Feb 18, 2027$52.28bn$5.54bn$46.74bn96.814097.09270.715%+0.288%+0.00206%
912797SA60.000%Oct 1, 2026$52.87bn$7.35bn$45.52bn98.160098.46860.706%+0.314%+0.00222%
91282CJC64.625%Oct 15, 2026$46.00bn$3.51bn$42.49bn102.5721100.60840.688%+0.340%+0.00234%
91282CHY04.625%Sep 15, 2026$44.00bn$919.0m$43.08bn100.5887100.90320.684%+0.313%+0.00214%
912797SK40.000%Oct 29, 2026$52.80bn$9.10bn$43.70bn97.903698.19010.676%+0.293%+0.00198%
912828V982.250%Feb 15, 2027$65.82bn$3.12bn$19.95bn$42.75bn98.998499.30990.668%+0.315%+0.00210%
912797SU20.000%Nov 27, 2026$52.31bn$10.12bn$42.19bn97.623597.91340.650%+0.297%+0.00193%
91282CHH74.125%Jun 15, 2026$40.00bn$40.00bn101.3063101.58380.640%+0.274%+0.00175%
91282CHU84.375%Aug 15, 2026$57.71bn$1.98bn$15.71bn$40.02bn100.7626101.09390.637%+0.329%+0.00209%
91282CHM64.500%Jul 15, 2026$40.00bn$2.71bn$4.0m$37.28bn101.1323101.47390.595%+0.338%+0.00201%
91282CHB03.625%May 15, 2026$50.90bn$4.79bn$10.91bn$35.20bn101.3406101.67230.563%+0.327%+0.00184%
9128287B01.875%Jun 30, 2026$33.83bn$10.16bn$23.67bn100.0026100.31420.374%+0.312%+0.00116%
9128286X32.125%May 31, 2026$35.36bn$1.35bn$11.22bn$22.79bn100.4310100.73110.361%+0.299%+0.00108%
912828YQ71.625%Oct 31, 2026$35.35bn$363.0m$12.05bn$22.93bn99.432398.94190.360%+0.324%+0.00117%
912828YX21.750%Dec 31, 2026$35.01bn$11.97bn$23.04bn98.939999.27240.360%+0.336%+0.00121%
912828Y951.875%Jul 31, 2026$33.27bn$2.29bn$9.22bn$21.75bn99.685899.99740.342%+0.313%+0.00107%
912828ZE30.625%Mar 31, 2027$36.30bn$414.0m$13.70bn$22.19bn96.970597.27170.340%+0.311%+0.00106%
912828YD61.375%Aug 31, 2026$36.16bn$2.32bn$12.78bn$21.05bn99.119699.45040.330%+0.334%+0.00110%
912828YU81.625%Nov 30, 2026$34.54bn$1.91bn$12.82bn$19.82bn99.138499.45980.310%+0.324%+0.00101%
912828YG91.625%Sep 30, 2026$35.32bn$17.47bn$17.85bn98.941999.26260.279%+0.324%+0.00090%
912828ZB91.125%Feb 28, 2027$36.84bn$23.16bn$13.68bn97.754198.03330.211%+0.286%+0.00060%
912810EY06.500%Nov 15, 2026$11.47bn$633.0m$6.59bn$4.24bn103.9287104.18610.070%+0.248%+0.00017%
912810EX26.750%Aug 15, 2026$10.90bn$2.08bn$5.14bn$3.68bn101.8391102.02350.059%+0.181%+0.00011%
912810EZ76.625%Feb 15, 2027$10.45bn$934.0m$6.67bn$2.85bn103.1673103.46630.047%+0.290%+0.00013%
Total$6.37tn100.000%+0.30847%

Prices are dirty, clean bid plus accrued, from Treasury's own end-of-day file. A security's return includes coupons received during the month, which are held as cash to the next reconstitution rather than reinvested intra-month. A dash in a deduction column means that security has none.

Index levels before September 30, 2026 are back-tested. They were computed after the fact by applying the rules to historical data, which benefits from hindsight in the choice of rules, and an index cannot be invested in directly. Methodology v1.0 takes effect at that rebalance, when levels begin to be struck on the day; the rulebook is identical either way, and the version is published on every row.

A fitted curve is a fit, not a quote. Daily error averages 3.8 basis points across the history and reaches about 20 on the worst days, in December 2008, when the market was genuinely hard to fit one smooth curve to. Every curve page publishes its own fit error rather than burying it.

Safe Rate™, Safe Rate Indices™ and the Safe Rate US Treasury Index™ are trademarks of Safe Rate, claimed through use in commerce and not registered. Third-party marks are the property of their owners, which are not affiliated with and do not endorse this data.

Curves are fitted from public Treasury data and carry fit error; figures are not a record of trading, and an index cannot be invested in directly. No claim of compliance with the IOSCO Principles for Financial Benchmarks is made or implied. Not investment advice, not an offer, and not a recommendation to buy or sell any security.