Stripped par is held as separate interest and principal components rather than as whole securities. The Safe Rate indices deliberately do not deduct it, and the whole-market figure is published so that decision can be argued with. Market statistics.
Amount outstanding as reported by Treasury, in its Monthly Statement of the Public Debt. The Safe Rate indices weight on a different figure, float-adjusted original par, and the two are not comparable security by security. For an inflation-linked security the difference is mostly inflation rather than float: Treasury reports what a holder is owed today, which includes the uplift shown as the index ratio above, while the index keeps original par and carries the uplift in the price. The index figures are published per holding.
Inflation-linked measures, October 20, 2026
An inflation-linked security prices off a real curve, so its yield is a real yield, a return above inflation rather than in cash terms, and its principal is indexed. The figures below are in REAL terms unless labeled otherwise.
Real yield
3.193%
Index ratio
1.3569
Real duration
18.285 yr
DV01
0.1215
Convexity
3.76
Real clean price
66.281
Accrued (real)
0.182
Real dirty price
66.463
Indexed principal
135.689
Money clean price
89.936
The index ratio is a multiplier, not a percentage: 1.3569 means the principal is worth that many times its original face today. So the real clean price of 66.281 is not what a buyer pays , multiply by the ratio to get 89.936 per 100 of original face.
Against the fitted real curve
Priced 0.6 bp rich to the real curve on that day, 6.92 cents per 100 of face.
That is -2.38 standard deviations from its own typical residual.
Real yield, 2,163 observations
Price history
2,163 trading days to Oct 20, 2026
The most recent 20 trading days of prices for 912810SB5.
Date
Bid
Offer
Close
Oct 20, 2026
66.234
66.156
66.281
Oct 19, 2026
65.969
65.906
65.594
Oct 16, 2026
66.484
66.406
66.313
Oct 15, 2026
66.188
66.094
66.000
Oct 14, 2026
64.891
64.813
65.250
Oct 13, 2026
64.859
64.781
64.750
Oct 9, 2026
64.313
64.250
64.219
Oct 8, 2026
63.969
63.906
64.344
Oct 7, 2026
63.516
63.438
63.719
Oct 6, 2026
64.031
63.969
63.906
Oct 5, 2026
63.625
63.563
63.531
Oct 2, 2026
64.156
64.094
63.938
Oct 1, 2026
64.156
64.094
64.188
Sep 30, 2026
64.188
64.125
64.000
Sep 29, 2026
64.234
64.188
64.438
Sep 28, 2026
64.594
64.531
64.594
Sep 25, 2026
65.125
65.063
65.281
Sep 24, 2026
65.859
65.781
65.500
Sep 23, 2026
66.781
66.719
66.469
Sep 22, 2026
67.750
67.688
67.719
Prices are per 100 of face, from Treasury's own end-of-day file. A dash in the bid or offer column means none was posted that day.
3 auctions
A CUSIP can be auctioned more than once: Treasury reopens an existing security rather than issuing a new one, so the same bond is sold again at whatever yield the market then wants.
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.
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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.