giltsyield.com

Return

-£0.707

28 Aug 2026 → 25 Sep 2026

Start dirty price

£50.005

model £50.072

End dirty price

£49.298

model £49.198

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	+£0.219	The passage of time at an unchanged yield: coupons earned plus the bond getting closer to redemption.
Rolldown	+£0.012	The yield change that comes from the shorter remaining maturity — rolling down the same curve.
Variation	-£1.104	The move in the curve itself between the two dates.
Unexplained	+£0.167	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.

TG49

What moved the price

The curve, then and now

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