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Great!

For 4 files with awk I tried:

awk 'ARGIND==1{a[$1]=$0 "null null null";next;}
ARGIND==2{if($1 in a)sub(/ null /, " "$1" ",a[$1]);else a[$1]="null "$1" null null";next; }
...

Dear Forum,

Full title of the topic would be: "Join 3 or more files using matching column without full list in any of these columns"

I have several, typically 3 or 4 files which I need to join,...