Yes we do! We have been transcribing market research audio and video for years.
When a market research audio has numerous participants we use our "group" style -- moderators and and participants are labeled as such, but we are unable to individually label everyone, as it is difficult to keep track of different voices when many people are talking. This also speeds up turnaround time.
Another thing to keep in mind is if you would like verbatim or semi-verbatim style for your market research. Verbatim captures every utterance, including "um"s and filler words and false starts. Semi-verbatim cleans it up a bit for better readability.
Finally, check out our Market Research tips blog post.⬅ FAQ