Their ownership is a bit hard to pin down, but they are simply a network equipment manufacturer. There would be a lot of mileage to be had out of finding some sort of backdoor in their products that allows data to be intercepted by the Chinese state, but this hasn't happened so far.
Ultimately if you feel your work is important enough that a nation state would spend time and money on getting hold of it then you should be testing equipment yourself, seeing what data it is sending/receiving, auditing the code if you're running open-source routing/switching platforms etc. Cisco routers have been targeted by the NSA during shipping and had things added to them, that didn't stop people buying Cisco.
Ultimately if you feel your work is important enough that a nation state would spend time and money on getting hold of it then you should be testing equipment yourself, seeing what data it is sending/receiving, auditing the code if you're running open-source routing/switching platforms etc. Cisco routers have been targeted by the NSA during shipping and had things added to them, that didn't stop people buying Cisco.