I don't think there will be contracts to build the bomb for any public company, at least I hope not. That seems like something done by the state itself.
But I think the bigger question would be about the carrier system. Because tactical bombs you might strap under an eurofighter or on a Taurus missile, however I don't think Germany for example would have anything for long range strategic ones.
So maybe look for whichever company could develop a ballistic missile and/or build/modify submarines to serve as launch platforms, if those won't just be land based. In that case I'd also wonder if diesel powered submarines like Germany currently have are suitable or if you'd want nuclear powered ones to be able to operate independently for longer.