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
2.422%
Index ratio
1.3251
Real duration
2.185 yr
DV01
0.0212
Convexity
0.0589
Real clean price
96.656
Accrued (real)
0.233
Real dirty price
96.889
Indexed principal
132.515
Money clean price
128.084
The index ratio is a multiplier, not a percentage: 1.3251 means the principal is worth that many times its original face today. So the real clean price of 96.656 is not what a buyer pays , multiply by the ratio to get 128.084 per 100 of original face.
Against the fitted real curve
Priced 7.0 bp cheap to the real curve on that day, 14.82 cents per 100 of face.
That is 3.75 standard deviations from its own typical residual.
Real yield, 1,933 observations
Price history
1,933 trading days to Oct 20, 2026
The most recent 20 trading days of prices for 9128285W6.
Date
Bid
Offer
Close
Oct 20, 2026
96.719
96.688
96.656
Oct 19, 2026
96.719
96.688
96.688
Oct 16, 2026
96.734
96.688
96.750
Oct 15, 2026
96.594
96.563
96.563
Oct 14, 2026
96.406
96.375
96.469
Oct 13, 2026
96.438
96.406
96.406
Oct 9, 2026
96.438
96.406
96.406
Oct 8, 2026
96.453
96.438
96.531
Oct 7, 2026
96.438
96.406
96.438
Oct 6, 2026
96.406
96.375
96.375
Oct 5, 2026
96.359
96.344
96.313
Oct 2, 2026
96.344
96.313
96.313
Oct 1, 2026
96.391
96.375
96.438
Sep 30, 2026
96.219
96.188
96.156
Sep 29, 2026
96.016
96.000
96.094
Sep 28, 2026
96.094
96.063
96.031
Sep 25, 2026
96.188
96.156
96.188
Sep 24, 2026
96.094
96.063
96.063
Sep 23, 2026
96.156
96.125
96.063
Sep 22, 2026
96.328
96.313
96.313
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.
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.