RE: Re Share price17 Dec 2020 12:09
Ibiza28 - a computer could do lots of things, but how trades are reported as buys or sells on trading systems is determined simply by whether the price at which the trade takes place sits above or below the mid price of the share. For heavily traded shares with a very small spread, this is likely to be accurate. But when the spread is wide, it is not.
The spread at the moment is 2.55 - 2.75, so the mid-price is 2.65. Any trade that falls below 2.65 will be reported as a sell, even if in fact it is a buy.
The more interesting question is why are most buys and sells occurring below mid-price, but some small trades (buys) occurring above mid-price. The MMs have many millions of shares that they need to place in the market, so need to encourage buying / avoid scaring off buyers. So they send out the occasional signal of a top-end price (by either placing a trade themselves or ripping off a very small PI) whilst, in fact, the real business is done on a really tight spread below the mid-price, as they look to place the shares as quickly as possible on very small margins, often selling for just fractions of a penny profit.