More detailed information now provided by Income Tax department today.
https://economictimes.indiatimes.com/wealth/tax/itr-filing-faqs-heres-what-to-do-if-you-dont-have-pan-of-unlisted-company/articleshow/70599931.cms?utm_source=ETTopNews&utm_medium=HPTN&utm_campaign=AL1&utm_content=23
Question 9: Please clarify whether holding of equity shares of a Co-operative Bank or Credit Societies, which are unlisted, are required to be reported?
Answer: The details of equity shareholding in any entity which is registered under the Companies Act, and is not listed on any recognised stock exchange, is only required to be reported.