Suspension, closing, bankruptcy

A company can suspend business or close down. If it can't pay what it owes, it goes bankrupt.

Suspension: You can resume later. While suspended, trading in the company's shares stops.
Closing down: Ending the company when it can pay everything it owes.
Bankruptcy: When it can't pay. Order payments and the like are returned as a share, and the shares disappear.
In both closing and bankruptcy, bank deposits are returned in full. Any money left is shared among the shareholders.
Shares the company held are shared among its shareholders in proportion to their holdings (the president gets any remainder).
A listed company is delisted. Open orders are canceled and returned.
Closed and bankrupt companies stay in search and on their company pages as “Closed” or “Bankrupt”. You can't trade with them.
Suspended companies also count toward the number of companies you can have (5).
Closing a company, changing the president, splitting shares, and similar actions run only after you confirm twice.