Who is they?
The shipping company harvests lobster for their business, because they receive a high demand for this type of seafood.

A:
The shipping company

Who is they?
Intel sued IntelSpec since they happen to have a trademarked brand in their company name.

A:
IntelSpec

Who is she?
When Sue went to Nadia's home for dinner, she showed her a big teddy bear.

A:
Sue