How to count the number of repetitions in front of each company?

Question

Google Sheets

How to count the repetitions in front of each company, namely, what is the number of repetitions? A document with a ready-made example of what I want to implement, for clarity:

Example document

Answer 1

Maybe,

=ARRAYFORMULA(IF(A3:A100<>"";MMULT(
  (ROW(A3:A100)>=TRANSPOSE(ROW(A3:A100))) *
    (A3:A100=TRANSPOSE(A3:A100))^1;
  ROW(A3:A100)^0
);))

See examples Performing Cumulative Calculations. Check