What is the difference between American and European exercise style options?

Warrants are a derivative that give the right, but not the obligation, to buy or sell a security, most commonly an equity, at a certain price before expiration.  The price at which the underlying security can be bought or sold is referred to as the exercise or strike price.  An American warrant can be exercised at any time on of before the expiration date, while European warrants can only be exercised on the expiration date.  Warrants that give the right to buy a security are known as call warrants; those that give the right to sell are known as put warrants…

All warrants must be settled in order to submit for exercise.

Please Note…

In the case of U.S. exchange listed options cleared by OCC, IBKR's deadline for providing notification of intent to exercise is 17:25 ET if the option is being exercised prior to expiration. At expiration, notice of intent to exercise is generally not required as OCC will automatically exercise options that are in-the-money by $0.01 or more…

Yes, you can place orders on an IBKR trading platform at any time, including the weekend. However, the orders will not submit to the exchange until the exchange opens for trading (including pre-market where available).  …