ericcccc

Thanks @peterB for the illustration. I get that part that slightly more sellers moved the price a little lower. It's more understandable during the day since the market is very active. What I don't understand is, why these sellers and buys are having tacit understanding and act on almost same time particularly at market close, at the very last minute ? Is this something related to arbitrage or automatic trading done by market makers ? The only thing I can think of is market makers are selling and buying at the same time so essentially they are playing with themselves, or playing with another market maker.

Hi community, just want to ask a question related to volume. I often see a huge volume coming in at market close. For example, there was 422k shares traded at market close for BABA on 4/9. However, these volume volume doesn't actually translate to price change. If you take a look at the price, it only changed less than 0.1$ . This often happens and is definitely not specific to this stock, this day. I am wondering, what happened at that time ?