Delisting is when a stock is removed from an exchange.

• A security can be delisted for a number of reasons, such as:
• No longer meeting an exchange’s listing requirements
• The company can initiate the delisting of their stock
• Acquisitions or mergers
• Called for redemption (warrants or ETN)
• Liquidation (ETFs)

Here’s what can happen if a security you own becomes delisted:

• The security's margin requirement can change
• Because the security no longer trades on the same exchanges, a national best bid and offer (NBBO) no longer exists.
• Typically, you can’t open new positions in the security but you may be able to close your position

You may also need to find stock quotes elsewhere for an idea of what price your sell order will execute at if you choose to and are able to close the position.

You can check out pending delistings with Nasdaq and NYSE.