Your structure allows duplicate data. For example, it allows data like this. (UUIDs abbreviated to prevent horizontal scrolling.)
Connection_id Company_id Owner_id
--
b56f5dc4...af5762ad2f86 4d34cd58...a4a529eefd65 3737dd70...a359346a13b3
0778038c...ad9525bd6099 4d34cd58...a4a529eefd65 3737dd70...a359346a13b3
8632c51e...1876f6d2ebd7 4d34cd58...a4a529eefd65 3737dd70...a359346a13b3
Each row in a relation should have a distinct meaning. This table allows millions of rows that mean the same thing.
Something along these lines is better. It's in 5NF.
CREATE TABLE CompanyOwners(
Company_ID UUID NOT NULL references Company (Company_ID),
Owner_ID UUID NOT NULL references Owner (Owner_ID),
PRIMARY KEY (Company_ID, Owner_ID)
);
Standard SQL doesn't allow "-" in identifiers.