Treasury Block Trades [Rolling headline, 29th September 2026]

Block trade tapes are best read as positioning colour rather than signal: single prints in size tell little about intent absent confirmation, but clusters and coherent structures across related contracts have historically flagged where conviction is forming. The distinction worth drawing is between outright blocks, which are ambiguous on direction since futures can hedge cash or set up for later flow, and structured trades, which are more legible. Here the option structures lean bullish duration: the Ultra bond 107.50/110 call spread is a defined-risk bet on a rally with the delta roughly hedged via the futures leg, and the deep out-of-the-money 10-year call buying is a low-cost convexity punt on a sharp rally, the kind of tail positioning that tends to appear either around event risk or as a cheap expression of a dovish view. The 5s10s steepener, buying fives against selling tens, is the cleanest read: trades of this kind have typically expressed either a view that the front-to-belly outperforms on a turn toward easing, or a relative-value view on curve shape around supply. Taken together the bias is long convexity and belly-led performance, though block prints in futures routinely sit against cash hedges and do not map one-for-one to directional cash positioning. The follow-ons worth noting are whether open interest confirms fresh risk rather than rolls, whether similar structures recur across sessions, and how the tape sits against the upcoming auction and data calendar.