Run the same query set against all four engines and log every brand named in each answer, not just whether you appeared — this reveals who's actually dominant.
[01]/ the data
What we found
In our own tracking, two companies captured 62% of all citation events across 82 tracked companies; without logging competitors, that concentration would be invisible.
[02]/ how to do it
Three steps
Log every brand mentioned per query response, not just yes/no for yourself.