giltsyield.com

Return

-£0.186

28 Aug 2026 → 25 Sep 2026

Start dirty price

£101.177

model £101.296

End dirty price

£100.992

model £101.143

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	+£0.335	The passage of time at an unchanged yield: coupons earned plus the bond getting closer to redemption.
Rolldown	+£0.010	The yield change that comes from the shorter remaining maturity — rolling down the same curve.
Variation	-£0.497	The move in the curve itself between the two dates.
Unexplained	-£0.033	The residual between the traded prices and what carry, rolldown and variation account for.

The curve, then and now

Market data as of 28 Aug 2026 and 25 Sep 2026.

TS28

What moved the price

The curve, then and now

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