If you are able to isolate the text portion corresponding to the company name, you can compute the similarity (based on the character edit distance - Levenshtein) against every item of a predefined list of companies (and their aliases) and pick the best match.
Ask HN: How to boost Gemini transcription accuracy for company names?
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Re: Ask HN: How to boost Gemini transcription accuracy for company names?
#32There was a paper that tried to integrate NER (Named Entity Recognition) with whisper to one shot for similar situation, not sure what is the current status