giltsyield.com

Return

+£99.467

04 Sep 2026 → 06 Oct 2026

Start dirty price

£0.000

model £0.000

End dirty price

£99.467

model £99.750

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	+£117.092	The passage of time at an unchanged yield: coupons earned plus the bond getting closer to redemption.
Rolldown	+£0.033	The yield change that comes from the shorter remaining maturity — rolling down the same curve.
Variation	-£0.967	The move in the curve itself between the two dates.
Unexplained	-£16.692	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.

T30K

What moved the price

The curve, then and now

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