A long-list for something such as a job or a prize is a large group that has been chosen from all the people who applied for the job, or all the people or things that are competing for the prize. The successful ones from this group are chosen to go on the shortlist. There are 27 riders on the long-list
If someone or something is long-listed for a job or a prize, they are put on a long-list of those to be considered for that job or prize. She was long-listed for the senior team last year