關於填寫application form

ceased operation, closed down business

The company has ceased its operation.
The company has closed down its business.

以上是專業(Company Secretary 填表報Company Registry)的慣用語。

你可加上since (exact date or just month & year)，如確實知日期。

2007-02-14 14:04:13 補充：
went bankrupt, in bankrupcy是破產。不是十分合用，除非是真的。

My previous employer went out of business

Company Closure