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
3.126%
Index ratio
1.0934
Real duration
19.582 yr
DV01
0.1610
Convexity
4.79
Real clean price
81.719
Accrued (real)
0.502
Real dirty price
82.221
Indexed principal
109.340
Money clean price
89.351
The index ratio is a multiplier, not a percentage: 1.0934 means the principal is worth that many times its original face today. So the real clean price of 81.719 is not what a buyer pays , multiply by the ratio to get 89.351 per 100 of original face.
Against the fitted real curve
Priced 1.8 bp cheap to the real curve on that day, 29.56 cents per 100 of face.
That is 0.73 standard deviations from its own typical residual.
Real yield, 674 observations
Price history
674 trading days to Nov 9, 2026
The most recent 20 trading days of prices for 912810TY4.
Date
Bid
Offer
Close
Nov 9, 2026
81.781
81.844
81.719
Nov 6, 2026
82.219
82.297
81.969
Nov 5, 2026
82.094
82.188
82.156
Nov 4, 2026
81.375
81.438
81.813
Nov 3, 2026
81.813
81.891
81.625
Nov 2, 2026
82.594
82.656
82.000
Oct 30, 2026
81.938
82.000
81.750
Oct 29, 2026
82.094
82.156
81.969
Oct 28, 2026
81.906
81.969
81.406
Oct 27, 2026
82.125
82.188
82.250
Oct 26, 2026
81.969
82.031
81.969
Oct 23, 2026
82.063
82.125
81.750
Oct 22, 2026
81.625
81.703
82.313
Oct 21, 2026
80.750
80.828
80.656
Oct 20, 2026
80.375
80.438
80.531
Oct 19, 2026
80.000
80.063
79.625
Oct 16, 2026
80.656
80.734
80.531
Oct 15, 2026
80.313
80.406
80.188
Oct 14, 2026
78.594
78.672
79.188
Oct 13, 2026
78.594
78.672
78.563
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.
Free to benchmark against. Paid only to track. Measuring anything against these curves and indices is free. No license, no fee, no registration, and no permission needed to say that you did, including in a prospectus. A fee applies to one thing: launching a product that tracks an index.
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.