While I don't have real-time data and my information is based on knowledge up to September 2021, I can provide you with a list of some well-known closed captioning service providers that were recognized for their quality services up to that point:

1. Rev: Known for its accurate and affordable captioning services, Rev offers fast turnaround times and supports various content types.

2. 3Play Media: Renowned for its commitment to accuracy and compliance, 3Play Media provides high-quality closed captioning services along with transcription and audio description services.

3. CaptionMax: CaptionMax specializes in offering closed captioning, subtitling, and audio description services for television, film, streaming platforms, and more.

4. AI Media: This provider utilizes AI-driven technology to deliver high-quality closed captioning and transcription services, focusing on speed and accuracy.

5. Vitac: Vitac is a prominent closed captioning provider offering services for broadcasting, online videos, live events, and more. They are known for their accuracy and wide-ranging solutions.

6. Cielo24: Cielo24 provides comprehensive captioning, transcription, and audio description services for various industries, including media, education, and government.

7. Dotsub: Dotsub offers professional closed captioning and subtitling services for global audiences, ensuring accurate translations and cultural nuances.

8. GoTranscript: While primarily known for transcription services, GoTranscript also offers closed captioning solutions, focusing on affordability and quick delivery.

9. Automatic Sync Technologies: This provider offers automated closed captioning and transcription services, making them suitable for projects with tight timelines and budgets.

10. FingerLinks Infotech LLP:  FingerLinks  specializes in closed captioning, subtitling, and transcription services for various industries, including entertainment, education, and corporate sectors.

Keep in mind that the landscape of closed captioning service providers can change over time, and it's a good idea to research and read reviews to find the best fit for your specific needs.