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
withheld
Index ratio
1.3100
Real duration
0.003 yr
DV01
0.0000
Convexity
0.000
Real clean price
100.000
Accrued (real)
1.927
Real dirty price
101.927
Indexed principal
130.996
Money clean price
130.996
The index ratio is a multiplier, not a percentage: 1.3100 means the principal is worth that many times its original face today. So the real clean price of 100.000 is not what a buyer pays , multiply by the ratio to get 130.996 per 100 of original face.
Against the fitted real curve
Priced 0.39 cents per 100 of face rich to the real curve on that day.
Shown as a price rather than a yield. Less than a month of this security's life remained, and annualizing a stub that short is arithmetic rather than information, the same reason its real yield is withheld above.
Real yield, 90 observations
Price history
91 trading days to Jan 14, 2009
The most recent 20 trading days of prices for 9128274Y5.
Date
Bid
Offer
Close
Jan 14, 2009
–
100.000
100.000
Jan 13, 2009
–
100.000
100.000
Jan 12, 2009
–
100.000
100.000
Jan 9, 2009
–
99.813
99.750
Jan 8, 2009
–
99.656
99.656
Jan 7, 2009
–
99.594
99.594
Jan 6, 2009
–
99.531
99.531
Jan 5, 2009
–
99.500
99.500
Jan 2, 2009
–
99.438
99.406
Dec 31, 2008
–
99.219
99.219
Dec 30, 2008
–
99.219
99.219
Dec 29, 2008
–
99.188
99.188
Dec 26, 2008
–
99.156
98.906
Dec 24, 2008
–
99.094
99.156
Dec 23, 2008
–
99.094
99.031
Dec 22, 2008
–
99.063
99.063
Dec 19, 2008
–
99.031
99.000
Dec 18, 2008
–
98.906
98.906
Dec 17, 2008
–
98.906
98.875
Dec 16, 2008
–
98.875
98.844
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.
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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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.