The Superstonk group on Reddit has a wealth of information about your question. Check the permalinks.
Short version: You can initiate share sales through the Computershare interface if necessary.
Many people have moved most of their shares to Computershare in order to help hasten the MOASS, but retain a small number in brokers like Fidelity to facilitate easier sales after the rocket launch.
The Superstonk group on Reddit has a wealth of information about your question. Check the permalinks.
Short version: You can initiate share sales through the Computershare interface if necessary.
Many people have moved most of their shares to Computershare in order to help hasten the MOASS, but retain a small number in brokers like Fidelity to facilitate easier sales after the rocket launch.