这个 extensive 应该有两重意义，一个是股东人数 extensive，另一个是每个股东持股数量extensive，正因如此，才有必要“to list details of all share allocations and shareholders”. 如果持股人太少（持股过于集中），或者持股人太多（持股过于分散），都没有单列的必要。
供你参考。

It explains a lot in the attached link.

"Extensive shareholding" is under the section "Shareholding", meaning it's a special section for shares owned by many shareholders, which requires records of all the shares owned by different stakeholders.

广泛持股的情况 / 大规模持股的情况

Could you provide more context?

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Note added at 3 days 11 hrs (2023-12-01 18:10:17 GMT)
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@Asker:
我想我看懂了，Extensive Shareholding 是 “股东的人数很多” 或 “持股的人数很多”。纽西兰政府要求各公司每年交纳一份 Annual Return（年报）。Annual Return 上要列明所有股东的真正名字和地址。如果股东人数很多，不便写在年报上，就要 “create and upload a separate document listing details of all share allocations and shareholders”。
所以 ：
“If your company has extensive shareholdings,” 可以翻译成：
“如果您的公司有广泛持股的情况，” 或
“如果您的公司的股东人数很多，” 或
“如果您的公司持股的人数很多，” 。

4. Shareholdings
Update or add any new information about:
the total number of shares
share allocations, and
the full legal name and address for each shareholder. .....
.
Extensive shareholding
If your company has extensive shareholdings, you need to create and upload a separate document listing details of all share allocations and shareholders.

https://companies-register.companiesoffice.govt.nz/help-cent...