Treasury Block Trades [Rolling Headline, 28th Sept 2026]

Outright blocks in Ultra 10s and 2s are consistent with basis, rolls, or asset-swap related hedging and tend to pass through without directional signal, whereas the options leg is the more interesting print: buying 10-year calls in size against selling futures is a delta-hedged volatility or convexity position, a pattern that in past episodes has accompanied accounts positioning for a range break or adding gamma cheaply rather than expressing a clean rate view. The direction of the futures hedge matters for interpretation, since the accompanying sale of ZN strips the call purchase of its initial delta and leaves the desk long vol. Prints clustered around roll periods or ahead of supply and data are common and often technical; isolated, unhedged blocks away from those windows carry more weight. The follow-ons worth noting are whether open interest confirms the positions as new rather than transferred, and whether further prints in the same tenor point to a programme rather than a one-off.