Market insights

The 1 1/8% Treasury Gilt 2039 (TR39, maturing 31 January 2039) has shown an anomalous rise in its spread to the interpolated curve yield. On 5 November 2026, the spread reached 2.21 bps, up from -1.56 bps the previous day, a rise of roughly 3.8 bps over the past day. This is the highest reading in the 12-month lookback and sits above the upper anomaly threshold of 1.74 bps.

Over the past month, the spread has moved from about -0.35 bps to 2.21 bps, an increase of around 2.6 bps. Over the past year, it has risen from roughly -4.06 bps to 2.21 bps, a change of about 6.3 bps. The move has been gradual over the year but accelerated sharply in the most recent sessions, with the spread turning positive on several days in September and October before the latest jump.

Because the measure compares TR39 with the yield implied by the surrounding curve, the signal points to a bond-specific shift in relative value rather than a broad move in gilt yields. In practical terms, TR39 is currently yielding more than the interpolated curve would suggest, meaning it trades cheap relative to adjacent maturities. Analysts monitoring this security should note that the reading is at a statistical extreme for the period and that the day-to-day volatility over the last few sessions has been pronounced.

The 3¾% Treasury Gilt 2053 (T53) recorded a spread to its interpolated curve yield of 3.23 bps on 5 November 2026. This is flagged as unusually high compared with the past 12 months. The upper threshold for this measure is approximately 2.86 bps, so the current reading sits above the anomaly boundary and is nearly level with the highest reading in the lookback window (3.25 bps on 19 November 2025).

Over the past day, the spread rose by roughly 5.5 bps from -2.31 bps on 4 November, reversing a negative reading and marking one of the largest daily moves in the series. Over the past month, the spread has widened by about 2.9 bps from 0.33 bps, and over the past year by roughly 2 bps from 1.27 bps.

A positive spread means T53 yields more than the curve implied by neighbouring maturities, indicating that the bond trades cheap relative to the curve. The daily series has been volatile, with several single-session spikes and reversals, such as 1.31 bps on 3 June 2026, 1.37 bps on 31 July 2026, and -2.31 bps on 4 November 2026. The latest reading should therefore be assessed alongside subsequent sessions before concluding that a persistent relative-value dislocation exists. This is a relative-value observation and does not indicate the direction of absolute yields.

TG57, the 1¾% Treasury Gilt 2057, closed on 2026-11-05 at a spread of -4.98 bps to the interpolated gilt curve. This is well below its 12-month mean of roughly -0.58 bps and beyond the lower threshold of -2.85 bps, about 5.8 standard deviations below the mean, which flags it as an anomaly.

The move was sharp. The spread fell by about 2.5 bps in the past day, from -2.46 bps on 2026-11-04, and the one-day decline is the largest in the twelve-month series. Over the past month, the spread has fallen by roughly 5.2 bps, from +0.23 bps on 2026-10-05. Over the past year, it has moved from about -0.12 bps to -4.98 bps. Before this sell-off, the spread had mostly stayed between -2.2 and +1.2 bps.

A negative spread means TG57 yields less than the interpolated yield of its neighbouring gilts, so it is trading rich relative to the curve. Its yield has fallen compared with the curve, which implies higher relative prices for this long-dated 2057 bond. The data alone does not identify the cause, whether that is demand, liquidity or supply factors. Investors comparing long-end gilts, or using TG57 as a curve reference point, should note that its pricing has become a clear outlier against the curve over the period.

The TG27 (1¼% Treasury Gilt 2027) spread to the interpolated curve yield stood at -24.63 bps on 2026-11-05, well below its 12-month threshold of -15.02 bps and roughly 4.5 standard deviations under its typical level. A negative spread means the bond yields less than the curve implies at its maturity, so it trades rich relative to neighbouring tenors.

The move has been persistent rather than a single-day outlier. Over the past day, the spread fell by about 4 bps from -20.66 bps. Over the past month, it declined by roughly 25 bps from around 0.19 bps on 2026-10-05, moving from near-fair value to deeply negative, with a sustained run of lower readings since 2026-10-22. Over the past year, it has dropped about 27 bps from +2.40 bps on 2025-11-05.

The series has been volatile over the lookback period, including sharp one-day swings such as the -12.14 bps reading on 2026-10-06, so individual observations should be interpreted with care. Nonetheless, the current reading is the lowest in the twelve-month window and sits outside the statistical threshold. The implication is that the 2027 gilt is pricing at a notable premium to the curve, which may matter for relative-value assessments and for any analysis that uses the short end of the curve as a reference point.

The 4½% Treasury Gilt 2042 (T42, maturing 7 December 2042) has shown an anomalous rise in its spread to the interpolated curve yield. On the latest observation, 5 November 2026, the spread reached 2.59 bps, up from -0.68 bps the previous day. This is a past day increase of roughly 3.3 bps and the highest reading in the twelve-month lookback window. The value exceeds the anomaly's upper threshold of 2.56 bps, which is why it was flagged as a high-direction anomaly.

Over the past month, the spread has moved from about 0.17 bps to 2.59 bps, a rise of roughly 2.4 bps. Over the past year, it has moved from about -0.12 bps to 2.59 bps, a rise of roughly 2.7 bps. The series was fairly volatile during this period, with readings ranging from about -1.34 bps in early December 2025 to the current high. The previous peak in the window was 2.08 bps in May 2026.

A positive spread means T42 is yielding more than the yield implied by the neighbouring points on the gilt curve, so the bond is trading cheap relative to the curve. The move is significant because the bond now sits well above its recent range. For analysts, this points to a relative-value dislocation specific to this 2042 gilt, which should be monitored in subsequent sessions to see whether the spread persists or reverts.

The 3¾% Treasury Gilt 2052 (T52) has shown an unusually low spread to the interpolated gilt curve. On 2026-11-05, its spread fell to -7.15 bps, down from -3.80 bps the previous day. This is the lowest reading in the 12-month lookback and breaches the anomaly lower threshold of -4.66 bps.

Over the past day, the spread moved by roughly -3.3 bps. Over the past month, it widened from about -3.5 bps to -7.15 bps. Over the past year, it moved from about -1.8 bps to -7.15 bps. The series has produced earlier dips, such as -4.10 bps on 2025-11-24, but none approaching the current level. The spread has also been mostly negative over the lookback period, with a single positive print of +0.93 bps on 2025-12-18.

A negative spread means T52 yields less than the curve implied by its neighbouring tenors, so the bond is trading rich relative to the curve. The move is concentrated in the latest session rather than building gradually, which makes it a notable deviation from recent behaviour. The data alone cannot establish the cause, so the reading should be interpreted as a relative-value signal for T52 specifically rather than a broad shift in the gilt curve.

The 3½% Treasury Gilt 2045 (T45, ISIN GB00BN65R313, maturity 22 January 2045) recorded a spread to the interpolated curve yield of -0.54 bps on 5 November 2026. This is below the lower threshold of -0.22 bps for the past 12 months and represents an unusually low reading for this bond. A negative spread means the bond's yield is currently below the yield implied by the interpolated gilt curve at its maturity, so the bond is trading rich relative to the curve.

The move has been sharp. Over the past day, the spread fell from 3.79 bps to -0.54 bps, a decline of roughly 4.3 bps. Over the past month, it has narrowed from 1.17 bps on 5 October 2026, a reduction of about 1.7 bps. Over the past year, it has fallen from 1.52 bps on 5 November 2025, a decline of about 2.1 bps. The series has been volatile over the lookback window, with a standard deviation of 0.75 bps, so the latest reading is a sizeable deviation from its recent range.

The implication is that T45 has moved to a markedly richer valuation versus the rest of the curve in a single session, and this is the most significant deviation in the spread's 12-month history. Investors monitoring relative value in the 2045 segment of the curve should note that the bond's pricing relative to neighbouring maturities has shifted materially.

On 2026-11-05, the TG38 (3¾% Treasury Gilt 2038, maturing 29 January 2038) spread to the interpolated curve yield fell to -2.88 bps. This is well below the 12-month alert band of roughly 0.12 to 6.87 bps, and it is the lowest reading in the twelve-month series. The move was abrupt: the spread was 2.03 bps on 2026-11-02, rose to 3.78 bps on 2026-11-03 and 5.58 bps on 2026-11-04, then dropped to -2.88 bps in a single session.

Over the past day, the spread narrowed by about 8.5 bps. Over the past month, it declined by roughly 5 bps from about 2.1 bps on 2026-10-05. Over the past year, it fell from about 4.9 bps on 2025-11-05, a decline of roughly 7.8 bps. Its 12-month standard deviation is about 1.1 bps, so the current reading sits several standard deviations below its typical level.

A negative spread means TG38 is yielding less than the curve implied by neighbouring gilts, so it is trading rich relative to the curve. Because the reading reversed sharply from positive levels within days, the most immediate implication is that the price level should be verified before it is relied upon, since a move of this size in one session may reflect a temporary pricing or liquidity effect rather than a sustained shift in relative value. Monitoring whether the spread recovers toward its historical range would help confirm whether the anomaly persists.