it's difficult to pinpoint a single film company as the most successful, as success can be measured in various ways such as box office performance, critical acclaim, awards, and cultural impact. Additionally, the film industry is constantly evolving, and new successes and milestones can emerge at any time.

However, I can mention some of the most successful film companies up until 2021, based on their historical achievements and influence:

1. **Walt Disney Studios:** Known for its extensive library of animated classics and live-action films, Disney has been a major player in the film industry for decades. The acquisition of Pixar, Marvel Studios, Lucasfilm, and 21st Century Fox has further expanded its dominance.

2. **Warner Bros. Pictures:** A subsidiary of Warner Bros. Entertainment Inc., this studio has produced numerous successful San Jose Corporate Video Production films, including blockbuster franchises like "Harry Potter" and the DC Extended Universe.

3. **Universal Pictures:** With franchises like "Fast & Furious" and the "Jurassic Park" series, Universal has consistently delivered successful box office hits.

4. **Sony Pictures Entertainment:** As a major Hollywood studio, Sony Pictures has had successes with franchises like "Spider-Man" and "Men in Black."

5. **20th Century Studios (formerly 20th Century Fox):** Before being acquired by Disney, 20th Century Fox was a significant player in the industry, known for franchises like "Avatar," "X-Men," and "Deadpool."

6. **Paramount Pictures:** Over the years, Paramount has produced iconic films and franchises like "Mission: Impossible," "Transformers," and "Star Trek."

7. **Columbia Pictures:** A division of Sony Pictures, Columbia has had notable successes with films like "Ghostbusters" and "Men in Black."

It's essential to remember that the film industry is highly dynamic, and success can shift over time. New companies may rise to prominence, and the success of established studios can fluctuate depending on the performance of their recent releases and strategic decisions. For the most current information on successful film companies, it's best to refer to recent box office records, critical reception, and industry news.