I'm not sure whether Kingpin and Ben Urich would be considered DD or Spider-Man characters, though. And Sony has the Spidey rights. For that matter, isn't Silvermane originally a Spidey character?
Granted, both Kingpin and Urich were in the DD movie, but now that Fox's rights to DD have lapsed, things could've changed. Maybe some rights went to Marvel while the rights to the "joint" SM/DD characters stayed with Sony. I dunno, maybe that's unlikely, but I'm reluctant to assume anything.