A floating-rate note resets quarterly against the 13-week bill, so it has no yield to maturity: the cashflow schedule a yield would describe does not exist. What it has instead is a spread, the margin a buyer earns over that reference rate, and a sensitivity to that spread rather than to the level of rates.
Discount margin
12.5 bp
Spread at auction
4.8 bp
Index rate
1.627%
Spread duration
0.003 yr
Spread DV01
0.0000
Clean price
100.000
Accrued
0.487
Dirty price
100.487
Rate duration
0.0000 yr
Rate duration is almost zero, and that is the instrument rather than a missing number: because the coupon resets, the price barely moves when the level of rates moves. Spread duration is the one that matters here. It says how much the price moves if the market demands a wider margin.
Its current margin is 1.32 standard deviations from its own typical margin.
Discount margin, 499 observations
Price history
500 trading days to Oct 30, 2019
The most recent 20 trading days of prices for 9128283B4.
Date
Bid
Offer
Close
Oct 30, 2019
–
100.000
100.000
Oct 29, 2019
–
100.000
100.000
Oct 28, 2019
–
100.000
100.000
Oct 25, 2019
–
99.999
99.999
Oct 24, 2019
–
99.999
99.998
Oct 23, 2019
–
99.998
99.999
Oct 22, 2019
–
99.998
99.998
Oct 21, 2019
–
99.998
99.999
Oct 18, 2019
–
99.998
99.999
Oct 17, 2019
–
99.997
99.997
Oct 16, 2019
–
99.997
99.997
Oct 15, 2019
–
99.997
99.997
Oct 11, 2019
–
99.997
99.997
Oct 10, 2019
–
99.996
99.996
Oct 9, 2019
–
99.996
99.998
Oct 8, 2019
–
99.996
99.996
Oct 7, 2019
–
99.996
99.995
Oct 4, 2019
–
99.996
99.996
Oct 3, 2019
–
99.995
99.997
Oct 2, 2019
–
99.996
99.996
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.
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