背景情况：一旦一家私人公司拥有500名股东，那么根据美国证交会的规定，这家公司必须对它的私募股权进行登记，并且披露其财务业绩。

Here's the background: Once a private company has 500 shareholders, SEC rules require the company to register its private stock and disclose financial results.

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根据新源业绩标准（NSPS）新建的设施，其许可条件可能会收紧，许可要件可能会增加。

Newer units, constructed under New Source Performance Standards (NSPS), may have their permit requirements tightened and new elements added.

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