Acronym

Hardly. Problem is here why for example it wouldn't take H P G S P L

What's the rule that it don't take Pvt Ltd into acronym?

Look this example and see problems:

Book1.xls

This is bunch of different types of acronyms.

A is formula.
B is propper acronym
C is text
(D:K) - select C column -> Text to Column -> Delimited -> Check Space box -> Finish

Some match, some don't. See is this good enough for you.

On other sheet (Sheet1) is explanation of all those acronyms taken from http://en.wikipedia.org/wiki/Acronym_and_initialism