While funding rates are the main driver for many Eurex futures rolls, the Bund and Shats calendar spreads are different. Their performance is primarily determined by the evolution of the cheapest-to-deliver (CTD) yield curve and relative value dynamics, making them directional to yields.

With both the Federal Reserve and European Central Bank expected to remain on hold, forward financing rates are stable. This removes central bank policy as a key driver for the upcoming bond futures roll, elevating the importance of technical factors like investor positioning and repo market specifics.

Contrary to historical norms where Eurex futures lack delivery option value, the German Buxl (30-year) future currently presents some. This is driven by potential Cheapest-to-Deliver (CTD) switches, particularly to a lower coupon bond in a sell-off, creating an asymmetric upside risk for the delivery option's value.

Unlike other Eurex futures using a 6% notional coupon, the Buxel contract's unique 4% coupon makes it highly sensitive as German yields approach this level. Despite a large delivery option value, the Buxel future appears 8-10 cents cheap versus fair value, presenting a potential trading opportunity, albeit one requiring caution in the current volatile market.

The recent, severe flattening of the 10-30 year EUR swap curve was exacerbated by the mass unwinding of a crowded “steepener” trade. This pre-existing heavy positioning caused a more aggressive reaction (a higher beta) to rising terminal rate expectations than observed in previous hiking cycles, leading to a 50 basis point round trip.

The sell-off in 30-year German yields has increased the probability of the Buxel futures' 'Cheapest to Deliver' (CTD) bond switching. This is not a trivial event; such a switch would alter the future's price sensitivity (delta) by approximately 35%, posing a significant and potentially unmanaged risk for investors who are not dynamically hedging their positions.

The recent underperformance of emerging market sovereign debt relative to corporate debt is not just about credit fundamentals. A key technical factor is the inherently longer duration of sovereign bond indices, making them more sensitive and vulnerable to losses when the U.S. Treasury yield curve moves higher and steepens.

Instead of making binary bets on whether prices will rise or fall, sophisticated traders maximize value from the "shape of the curve"—the price differentials between contract months. They shift hedges to capture these anomalies, a more nuanced approach to risk management.

The 6% notional coupon for Treasury futures, set by the CME in 2000, is now a critical factor. As 30-year yields approach this level for the first time since its introduction, all deliverable bonds become similarly priced after conversion factor adjustment, significantly increasing the probability of a cheapest-to-deliver (CTD) switch.