Question

What does M/s indicates before any company name

Answer 1

We only use the abbreviation - Messrs (pronounced messers). Messrs is just the plural for Mr. It occassionally gets used in company names and so on, or if you are referring to several men by name in a formal way.

Answer 2

means Messrs (plural of Mister) is usually used for the partnership firms where 2 or more people are involve