Yasi, I am only guessing here regarding your question of why a...

Yasi, I am only guessing here regarding your question of why a trader would stick to the same last three digits in his bot trades.

It may be as simple as quick recognition of his trades. Like his signature for that day.

I could imagine his screen is littered with trades, so perhaps knowing he is using say 358 and 611 for a particular stock allows him to recognise his own dirty work quickly.

Just a thought.

Larry