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, November 9, 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
3.131%
Index ratio
1.3052
Real duration
21.900 yr
DV01
0.1154
Convexity
5.06
Real clean price
52.656
Accrued (real)
0.059
Real dirty price
52.715
Indexed principal
130.523
Money clean price
68.728
The index ratio is a multiplier, not a percentage: 1.3052 means the principal is worth that many times its original face today. So the real clean price of 52.656 is not what a buyer pays , multiply by the ratio to get 68.728 per 100 of original face.
Against the fitted real curve
Priced 3.8 bp rich to the real curve on that day, 44.29 cents per 100 of face.
That is 0.70 standard deviations from its own typical residual.
Real yield, 1,676 observations
Price history
1,676 trading days to Nov 9, 2026
The most recent 20 trading days of prices for 912810SM1.
Date
Bid
Offer
Close
Nov 9, 2026
52.719
52.781
52.656
Nov 6, 2026
53.031
53.109
52.875
Nov 5, 2026
52.938
53.031
53.000
Nov 4, 2026
52.406
52.484
52.719
Nov 3, 2026
52.750
52.828
52.594
Nov 2, 2026
53.313
53.375
52.875
Oct 30, 2026
52.875
52.922
52.688
Oct 29, 2026
52.938
53.000
52.844
Oct 28, 2026
52.813
52.875
52.438
Oct 27, 2026
53.000
53.063
53.063
Oct 26, 2026
52.844
52.922
52.844
Oct 23, 2026
52.938
53.000
52.750
Oct 22, 2026
52.625
52.703
53.125
Oct 21, 2026
52.000
52.078
51.938
Oct 20, 2026
51.688
51.766
51.813
Oct 19, 2026
51.438
51.500
51.156
Oct 16, 2026
51.906
51.984
51.813
Oct 15, 2026
51.656
51.750
51.563
Oct 14, 2026
50.438
50.516
50.844
Oct 13, 2026
50.375
50.469
50.375
Prices are per 100 of face, from Treasury's own end-of-day file. A dash means that side was not quoted that day, which is almost always the offer and almost always near maturity: a holder of a bill days from paying par has little reason to sell it.
2 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.