PENDING: Initial state for a newly created instrument which has not yet begun trading.
CLOSED: No order entry, modification, cancellation, or matching. Day orders expired.
OPEN: Continuous order entry and matching.
PREOPEN: Orders accepted, no matching. Dutch Auction on transition to OPEN.
MATCH_AND_CLOSE_AUCTION: Like PREOPEN, matches on transition out.
SUSPENDED: Cancel only. No entry, modification, or matching.
HALTED: Like SUSPENDED, no cancels allowed.
EXPIRED: All resting orders expired, no new orders.
TERMINATED: Order book removed, all orders and positions closed.