Publisher of my copy was Everyman's Library/Knopf, 2003, translators Pevear and Volokhonsky. I think you might be right, and Penguin Classics never picked this one up, although they published some obscurer Dostoevsky titles, e.g. The Village of Stepanchikovo. Perhaps they knew it was in print from a competitor -- I used to have an edition called A Raw Youth -- and not selling like hotcakes there, so they'd let it alone. But P and V have won so much attention that any Dostoevsky title rendered by them is probably going to make money for a publisher.