Its more complicated then that imo...typically its hft..high frequency trading algo. Broker will declare neutral approach as to not get in trouble with iroc ( manipulation) but set up automated intra day shorting by both buying and selling small lots. They will typically set up a block of shares on the ask a bit higher and watch,. if someone takes out the lower small ask they reset the block higher..the purpose is to entice retail to sell to them...so its shorting to acquire or make  a few $$ shorting with net effect to drop share price...this  goes on and on until buyers show up. Today is a down day in market so i guess they feel embolded...

if your long sit back and relax and if you trade a part of your shares remember they have all the tools you dont including real time data on all the plaforms in Canada..about 6 or 7 trading platforms that you dont see even with level 2 access which only gives you tsx..those alternate channels can account for 20-40% of shares traded daily sometimes more. There is no transparency to the actual bid and ask in Canadafor the average retail investor. good luck