Still priced, no longer analyzed. Risk numbers below are as of Apr 28, 2026, analytics stop about three months before maturity, because a security with one cashflow left does not have a meaningful yield curve exposure.
Risk, April 28, 2026
Yield to maturity
withheld
Modified duration
0.003 yr
DV01
0.0000
Convexity
0.000
Dirty price
101.181
Yield and duration are withheld this close to maturity, not missing. Inside a month a Treasury trades on settlement mechanics rather than on yield, and its price is a rounding of par, annualizing a two-day stub produces a number in the tens of percent that would be arithmetically correct and completely misleading. The price, the residual and the key rate durations below are unaffected.
Where its rate sensitivity sits
3M
6M
1Y
2Y
3Y
5Y
7Y
10Y
15Y
20Y
25Y
30Y
Sensitivity to a one basis point move at each point on the curve, in years. All of it sits at 3M. For a security with a single remaining cashflow that is the true shape, not missing data.
Against the fitted curve
Priced 0.38 cents per 100 of face rich to the curve on that day.
Shown as a price rather than a yield. This security was close enough to maturity that annualizing is meaningless, the same reason it carries no yield to maturity above, and the same difference quoted in basis points would read as an enormous mispricing rather than the few cents it is.
Yield to maturity, 1,752 observations
Price history
1,753 trading days to Apr 29, 2026
The most recent 20 trading days of prices for 9128286S4.
Date
Bid
Offer
Close
Apr 29, 2026
–
99.969
100.000
Apr 28, 2026
–
100.000
100.000
Apr 27, 2026
–
99.969
100.000
Apr 24, 2026
–
99.969
99.969
Apr 23, 2026
–
99.969
99.969
Apr 22, 2026
–
99.969
99.969
Apr 21, 2026
–
99.969
99.969
Apr 20, 2026
–
99.969
99.938
Apr 17, 2026
–
99.969
99.969
Apr 16, 2026
–
99.938
99.938
Apr 15, 2026
–
99.938
99.938
Apr 14, 2026
–
99.938
99.938
Apr 13, 2026
–
99.938
99.938
Apr 10, 2026
–
99.938
99.938
Apr 9, 2026
–
99.906
99.906
Apr 8, 2026
–
99.906
99.906
Apr 7, 2026
–
99.906
99.906
Apr 6, 2026
–
99.906
99.906
Apr 3, 2026
–
99.906
99.906
Apr 2, 2026
–
99.906
99.906
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.
Auction
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.