giltsyield.com

Return

-£0.678

04 Sep 2026 → 06 Oct 2026

Start dirty price

£40.399

model £40.666

End dirty price

£39.721

model £39.891

Mark-to-market is the traded price; mark-to-model discounts the remaining flows along the fitted curve. The decomposition below is computed on the model prices.

What moved the price

Effect	Contribution	What it is
Carry	+£0.191	The passage of time at an unchanged yield: coupons earned plus the bond getting closer to redemption.
Rolldown	+£0.006	The yield change that comes from the shorter remaining maturity — rolling down the same curve.
Variation	-£0.972	The move in the curve itself between the two dates.
Unexplained	+£0.097	The residual between the traded prices and what carry, rolldown and variation account for.

The curve, then and now

Market data as of 04 Sep 2026 and 06 Oct 2026.

T51A

What moved the price

The curve, then and now

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