Speaking about the FIT spread (5yr vs. 10yr ) someone rolled a monster one from March into June yesterday buying -3.5 in the 5yr calendar 100,000 times in one order and then literally within 1 minute turning and selling the 10yr calendar 60,000 times at Even. Both gave up edge lifting the offer and then hitting the bid. Weightings work out to exact FIT spread weighting of around 1.66 5yr notes to 1 10yr note. This is a pretty big flattener position.
