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I received an offer from a midsize firm that has a very small class.

I then this week did two CBs with huge firms, but I haven't heard back yet.

Is there a way to reach out to the recruiter and politely ask what the timeline is for hearing? I don't want to string the little firm along.

I would email recruiting from the firms that you haven't heard back from to let them know you have an "exploding offer." They will probably accelerate the decision for you.