I spend time on the phone and heard the following, whether true or not, you judge.
apparently programme started both on ES and Dax at 3.15pm, buying lasted for 5 minutes and took us 30 points higher
we had 15' of consolidation with flag formation
and at 3:35pm second leg started that took us 30 points higher again in 5 minutes of buying
we then had 12 minutes of consolidation before starting another leg up that lasted again 5 minutes (started at 3:53 until 3:58) and took us 30 points higher
the last leg was in line with time compression after 2 minutes of consolidation and took us for a 20 points ride.
combination of time and price measurements are apparently in line with systematic intervention
the bid around 4702.5 ensures sufficient room for a an average weighted purchase price around 4660.
to quote my contact, systematic trading is about averaging up when the trend is up and making sure we stay at a comfortable level vs the average purchase price. There is an element of market manipulation depending on the volume you trade on the day. Obviously when markets are deep and see lots of volume, this element is negligible.
Days like today expose these behaviors as volumes are below average.