Вы можете изменить только одну строку, поэтому вместо
company = driver.find_element_by_class_name(company_elem).text
Попробуйте
company = driver.find_elements_by_class_name(company_elem)[item].text
, и результат будет:
company
1 UI Designer / Animator / Illustrator
2 Senior Product Designer
3 Freelance Senior Graphic Designer
4 Senior Product Designer, Internal Tools
5 Sr. Product Designer
6 User Researcher
7 Product Designer
8 Design Director
9 Product Designer
10 Supply Chain Account Manager - 200163935