Whether pan no will change due to change in companies consitiution form private ltd. to public ltd.

YES

as pe the requirements of Law when public company change into private company and vice versa.

pan no soulb also be change accordingly 

No

Only The Company Name will Change...

PAN no get changed only if the company opt to surrender the old PAN and apply for new PAN, while applying for change of name, OR The company can continue with the same PAN and only apply for change of name in PAN. Either way the company is required to apply for change of company name.

Yes. After change from pvt ltd to pub ltd following things are needed to be done: A. Arrange new PAN No. of the company B. Arrange new stationary with new name of the Company C. Update company bank account details D. Intimate all the concerned authorities like Excise and sales tax etc about the status changeE

PAN no is not likely to change. But the company has to intimate the IT office for change in status. A new PAN card will be given with the same PAN number.

PAN No. Will be same

only PAN Data will be corrected