Rebalance of August 30, 2024

1-3 Year constituents

Every one of the 96 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
96
Weights sum to
100.0000%
Contributions sum to
+1.115708%
Market value
$4.05tn

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 1-3 Year page, fetched separately.

These reconcile. The holdings below sum to +1.115708% against a published month return of +1.115708%, a difference of 8.8e-9 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 1-3 Year index at the August 30, 2024 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
912828Z781.500%Jan 31, 2027$98.52bn$22.08bn$76.44bn93.597894.82611.765%+1.312%+0.02316%
91282CKK64.875%Apr 30, 2026$69.33bn$328.9m$69.00bn101.9195103.01291.734%+1.073%+0.01861%
91282CKS94.875%May 31, 2026$73.10bn$4.10bn$69.00bn101.6071102.70291.729%+1.078%+0.01865%
91282CKY64.625%Jun 30, 2026$71.40bn$2.40bn$69.00bn100.8397101.94191.716%+1.093%+0.01876%
91282CLB54.375%Jul 31, 2026$72.80bn$3.80bn$69.00bn100.0431101.18551.702%+1.142%+0.01944%
91282CKH34.500%Mar 31, 2026$66.00bn$66.00bn101.5435102.57431.653%+1.015%+0.01678%
91282CKB64.625%Feb 28, 2026$65.73bn$2.73bn$63.00bn102.0917100.78831.586%+0.988%+0.01568%
91282CJV44.250%Jan 31, 2026$60.00bn$60.00bn99.5740100.54891.473%+0.979%+0.01443%
91282CKJ94.500%Apr 15, 2027$58.96bn$956.5m$58.00bn102.0779103.45241.460%+1.347%+0.01966%
91282CKV24.625%Jun 15, 2027$59.88bn$1.88bn$58.00bn101.8752103.22971.457%+1.330%+0.01938%
91282CKR14.500%May 15, 2027$65.29bn$7.29bn$58.00bn101.7663103.13861.456%+1.348%+0.01963%
91282CKZ34.375%Jul 15, 2027$67.42bn$9.42bn$58.00bn100.7959102.21941.442%+1.412%+0.02036%
91282CKE04.250%Mar 15, 2027$56.00bn$56.00bn101.6990103.08021.405%+1.358%+0.01907%
91282CJS14.250%Dec 31, 2025$57.00bn$57.00bn99.9008100.81321.404%+0.913%+0.01283%
912828M562.250%Nov 15, 2025$66.12bn$7.75bn$58.38bn97.508298.33491.404%+0.848%+0.01190%
91282CBQ30.500%Feb 28, 2026$74.21bn$1.0m$13.86bn$60.35bn94.115594.84791.401%+1.044%+0.01462%
91282CCW90.750%Aug 31, 2026$68.66bn$8.34bn$60.32bn93.220193.97501.387%+1.212%+0.01681%
91282CBH30.375%Jan 31, 2026$69.24bn$9.63bn$59.61bn94.001094.94091.382%+1.000%+0.01382%
91282CCF60.750%May 31, 2026$72.84bn$14.04bn$58.80bn93.720894.75721.359%+1.106%+0.01503%
91282CDK41.250%Nov 30, 2026$63.86bn$4.96bn$58.90bn93.555594.76201.359%+1.290%+0.01753%
91282CKA84.125%Feb 15, 2027$57.99bn$3.99bn$54.00bn101.6226100.86921.353%+1.288%+0.01743%
91282CJL64.875%Nov 30, 2025$54.62bn$622.0m$54.00bn101.1383102.01541.347%+0.867%+0.01168%
912828K742.000%Aug 15, 2025$66.48bn$3.0m$11.22bn$55.26bn98.141897.88451.338%+0.757%+0.01012%
91282CDG31.125%Oct 31, 2026$67.20bn$9.95bn$57.25bn93.534394.72891.321%+1.277%+0.01687%
91282CDQ11.250%Dec 31, 2026$64.74bn$7.74bn$57.00bn93.327494.53331.312%+1.292%+0.01695%
91282CCZ20.875%Sep 30, 2026$68.35bn$11.51bn$56.83bn93.294194.43551.308%+1.223%+0.01600%
91282CBT70.750%Mar 31, 2026$71.95bn$15.86bn$56.10bn94.314595.31971.305%+1.066%+0.01391%
91282CBW00.750%Apr 30, 2026$72.65bn$1.0m$16.45bn$56.20bn94.033395.03801.303%+1.069%+0.01393%
912828X882.375%May 15, 2027$71.06bn$672.0m$15.75bn$54.63bn95.753497.06011.290%+1.365%+0.01761%
9128282A71.500%Aug 15, 2026$65.36bn$32.0m$10.76bn$54.56bn95.161195.54621.280%+1.193%+0.01527%
91282CJE25.000%Oct 31, 2025$51.00bn$51.00bn101.6386102.49321.278%+0.841%+0.01075%
91282CBC40.375%Dec 31, 2025$67.98bn$13.02bn$54.96bn94.313995.19121.278%+0.930%+0.01189%
91282CJT94.000%Jan 15, 2027$52.00bn$52.00bn99.5910100.88721.277%+1.302%+0.01662%
91282CCP40.625%Jul 31, 2026$66.84bn$15.0m$11.19bn$55.64bn92.907993.99521.275%+1.170%+0.01492%
91282CAT80.250%Oct 31, 2025$60.84bn$5.0m$7.20bn$53.63bn94.750795.55431.253%+0.848%+0.01063%
91282CEC11.875%Feb 28, 2027$62.08bn$9.08bn$53.00bn95.097195.42181.243%+1.327%+0.01650%
91282CJP74.375%Dec 15, 2026$50.00bn$50.00bn100.7806102.08131.243%+1.291%+0.01604%
912828P461.625%Feb 15, 2026$64.95bn$6.0m$13.14bn$51.80bn96.468896.58391.232%+0.962%+0.01185%
91282CAM30.250%Sep 30, 2025$60.26bn$8.00bn$52.26bn95.084095.85661.225%+0.812%+0.00996%
91282CEF42.500%Mar 31, 2027$60.49bn$9.49bn$51.00bn96.652797.94061.216%+1.333%+0.01620%
91282CJB85.000%Sep 30, 2025$48.00bn$48.00bn101.9928102.78741.207%+0.779%+0.00941%
91282CJK84.625%Nov 15, 2026$48.91bn$913.4m$48.00bn101.6990102.95751.204%+1.237%+0.01490%
912828U242.000%Nov 15, 2026$69.14bn$190.0m$17.85bn$51.11bn95.486496.69701.204%+1.268%+0.01526%
91282CCJ80.875%Jun 30, 2026$70.26bn$18.42bn$51.84bn93.701194.77961.198%+1.151%+0.01379%
91282CAZ40.375%Nov 30, 2025$64.91bn$13.69bn$51.22bn94.626095.47231.195%+0.894%+0.01069%
912828R361.625%May 15, 2026$69.50bn$8.0m$18.77bn$50.72bn95.531996.58391.195%+1.101%+0.01316%
91282CEN72.750%Apr 30, 2027$55.79bn$6.79bn$49.00bn96.976298.31661.172%+1.382%+0.01620%
91282CJC64.625%Oct 15, 2026$46.00bn$46.00bn102.0210103.25051.157%+1.205%+0.01395%
91282CET42.625%May 31, 2027$55.22bn$7.22bn$48.00bn96.350997.65011.141%+1.348%+0.01538%
91282CHV65.000%Aug 31, 2025$49.68bn$4.68bn$45.00bn102.3111100.60391.135%+0.775%+0.00880%
91282CEW73.250%Jun 30, 2027$50.59bn$3.59bn$47.00bn97.845199.16781.134%+1.352%+0.01533%
91282CHY04.625%Sep 15, 2026$44.00bn$44.00bn102.3094103.53671.110%+1.200%+0.01332%
91282CFB22.750%Jul 31, 2027$49.99bn$3.99bn$46.00bn96.070097.44161.090%+1.428%+0.01556%
912828V982.250%Feb 15, 2027$65.82bn$5.0m$19.95bn$45.87bn96.319796.42871.090%+1.281%+0.01396%
91282CAJ00.250%Aug 31, 2025$55.43bn$9.89bn$45.54bn95.385996.00211.071%+0.777%+0.00832%
91282CHU84.375%Aug 15, 2026$57.71bn$15.71bn$42.00bn102.0505101.06961.057%+1.182%+0.01250%
91282CFE63.125%Aug 15, 2025$68.56bn$26.56bn$42.00bn99.817398.97381.034%+0.720%+0.00745%
91282CFK23.500%Sep 15, 2025$41.00bn$41.00bn99.9783100.76091.011%+0.783%+0.00791%
91282CGR64.625%Mar 15, 2026$40.00bn$30.0m$39.97bn101.9344102.97421.005%+1.020%+0.01025%
91282CGL94.000%Feb 15, 2026$55.63bn$15.63bn$40.00bn101.0649100.08150.997%+1.006%+0.01003%
91282CFW64.500%Nov 15, 2025$54.03bn$14.03bn$40.00bn100.7663101.63860.994%+0.866%+0.00861%
91282CFP14.250%Oct 15, 2025$40.00bn$1.0m$40.00bn100.7541101.57480.994%+0.815%+0.00810%
91282CHM64.500%Jul 15, 2026$40.00bn$4.0m$40.00bn100.4266101.58020.991%+1.149%+0.01138%
91282CHH74.125%Jun 15, 2026$40.00bn$40.00bn100.0297101.15160.987%+1.122%+0.01107%
91282CGV73.750%Apr 15, 2026$42.56bn$25.0m$2.58bn$39.95bn99.9503101.00720.985%+1.057%+0.01041%
91282CGA34.000%Dec 15, 2025$40.00bn$40.00bn99.7324100.62430.984%+0.894%+0.00880%
91282CHB03.625%May 15, 2026$50.90bn$10.90bn$40.00bn99.3933100.46840.980%+1.082%+0.01060%
91282CGE53.875%Jan 15, 2026$40.00bn$40.00bn99.2103100.18270.979%+0.980%+0.00959%
91282CAD30.375%Jul 31, 2027$49.00bn$5.44bn$43.56bn89.438590.75340.961%+1.470%+0.01413%
912828ZV50.500%Jun 30, 2027$46.61bn$9.50bn$37.11bn90.074791.36960.824%+1.438%+0.01185%
912828ZN30.500%Apr 30, 2027$38.04bn$5.96bn$32.08bn90.657691.88990.717%+1.359%+0.00975%
912828ZS20.500%May 31, 2027$41.99bn$10.0m$10.72bn$31.26bn90.365991.62980.697%+1.399%+0.00974%
9128286F22.500%Feb 28, 2026$33.54bn$1.0m$7.30bn$26.24bn97.983797.70820.634%+0.995%+0.00631%
9128286A32.625%Jan 31, 2026$32.00bn$6.29bn$25.71bn97.225998.18000.616%+0.981%+0.00605%
9128286L92.250%Mar 31, 2026$32.00bn$6.36bn$25.64bn97.193698.20900.615%+1.045%+0.00642%
9128286X32.125%May 31, 2026$35.36bn$11.20bn$24.16bn96.360097.42660.574%+1.107%+0.00635%
9128285N62.875%Nov 30, 2025$34.81bn$11.14bn$23.67bn98.205899.12120.573%+0.932%+0.00534%
9128287B01.875%Jun 30, 2026$33.83bn$10.16bn$23.67bn95.600596.67490.558%+1.124%+0.00627%
912828Y951.875%Jul 31, 2026$33.27bn$672.0m$9.22bn$23.38bn95.286396.39200.549%+1.160%+0.00637%
912828YD61.375%Aug 31, 2026$36.16bn$12.78bn$23.37bn94.700495.19890.546%+1.252%+0.00684%
912828YQ71.625%Oct 31, 2026$35.35bn$12.05bn$23.30bn94.723295.90010.544%+1.243%+0.00676%
9128285C03.000%Sep 30, 2025$31.00bn$8.87bn$22.13bn99.070799.87240.541%+0.809%+0.00438%
912828YX21.750%Dec 31, 2026$35.01bn$11.97bn$23.04bn94.464795.71540.537%+1.324%+0.00711%
9128284Z02.750%Aug 31, 2025$33.18bn$11.26bn$21.93bn99.025898.42900.536%+0.786%+0.00421%
9128285T32.625%Dec 31, 2025$32.00bn$4.0m$10.43bn$21.57bn97.540898.46370.519%+0.946%+0.00491%
912828ZE30.625%Mar 31, 2027$36.30bn$13.76bn$22.54bn91.272592.51640.507%+1.363%+0.00692%
912828YU81.625%Nov 30, 2026$34.54bn$424.0m$12.82bn$21.30bn94.431595.64050.496%+1.280%+0.00635%
9128285J53.000%Oct 31, 2025$31.00bn$5.0m$11.61bn$19.39bn98.758299.58970.472%+0.842%+0.00398%
9128286S42.375%Apr 30, 2026$32.41bn$1.0m$13.11bn$19.30bn97.131598.18820.462%+1.088%+0.00503%
912828YG91.625%Sep 30, 2026$35.32bn$17.47bn$17.85bn95.014996.19260.418%+1.240%+0.00519%
912828ZB91.125%Feb 28, 2027$36.84bn$23.16bn$13.68bn92.970893.66560.314%+1.352%+0.00424%
912810EW46.000%Feb 15, 2026$12.90bn$67.0m$6.64bn$6.19bn105.0505102.99730.160%+0.901%+0.00145%
912810EY06.500%Nov 15, 2026$11.47bn$633.0m$6.59bn$4.24bn106.9715107.96060.112%+0.925%+0.00104%
912810EX26.750%Aug 15, 2026$10.90bn$2.08bn$5.14bn$3.68bn107.8654105.66100.098%+1.085%+0.00106%
912810EV66.875%Aug 15, 2025$12.60bn$1.42bn$7.83bn$3.35bn105.4231102.91750.087%+0.884%+0.00077%
912810EZ76.625%Feb 15, 2027$10.45bn$934.0m$6.67bn$2.85bn109.0264107.02960.077%+1.207%+0.00093%
Total$4.15tn100.000%+1.11571%

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.