giltsyield.com

Return

-£0.363

04 Sep 2026 → 02 Oct 2026 · includes £0.602 coupon

Start dirty price

£157.733

model £105.517

End dirty price

£156.768

model £103.698

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	+£1.074	The passage of time at an unchanged yield: coupons earned plus the bond getting closer to redemption.
Rolldown	+£0.066	The yield change that comes from the shorter remaining maturity — rolling down the same curve.
Variation	-£2.358	The move in the curve itself between the two dates.
Unexplained	+£0.855	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 02 Oct 2026.

TR40

What moved the price

The curve, then and now

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