- Read your competitor's blog, if it exists. The author may discuss recent clients or talk about their best leads.
- Follow competitors' social media properties, such as LinkedIn, Facebook and Twitter. Clients may post comments, giving you a look at their situations and demographics.
- Read reviews on sites such as Google, Bing, Yahoo and Yelp. The postings may also provide clues to the competitor's client list.
- Are competitors attending and networking at leads groups? Listen to their "commercials" for mentions of good qualified leads.
- Finally, search for your competitor with Google or Bing, especially for articles where the competitor's business is discussed.
Take good notes of what you find. Over time a composite image will be revealed of your competitor's clients. And analysts like me can help identify trends and patterns.