Promotion to ftse 250 or ftse 100

[vulture1]

Do companies that are looking to or have the potential to be promoted up to the ftse 250 or ftse 100 see a bigger increase in value above their current value for the fact that they will be up in the next higher "league" so to speak as investors will have to buy into them?

[anonymous-user]

generally speaking only when it is certain that the promotion is happening

but the effect is less marked now than it was historically