Strengths:
Focus - we've considered expanding our offering, but reliable, accurate rankings are a foundation of internet marketing, and we've found a strong and profitable niche. our focus has enabled the following.
Reliability - haven't missed a day of auto rankings in 3+yrs
Accuracy - regularly win head-to-head accuracy tests against competitors carried out by prospects
Customer service - respond to most support requests in 50%
Strong reputation, growing positive brand, not as well known as we could be
Technology - building and managing our own infrastructure has been a key to our success, and kept our costs very low. ruby on rails has allowed for rapid and disciplined development. high reliable and efficient app running on rock solid LInux stack.
Self financed, low costs (i.e., no offices), only two full time W2 employees (myself and my partner/CTO), two low cost regular contractors for sysadmin and customer support, several specialist contractors available as needed

Weaknesses:
Still a little too reliant on one very large client (LexisNexis) and a handful of other larger clients...getting better
Not having employees limits tech development scope and speed and therefore biz dev and growth
Poor messaging
Poor social media presence
Not widely known, even in SEO circles (improving)

Opportunities:
Many, many enterprise high volume API integration prospects
Big data analytics integrations make our data infinitely more valuable
Attractive strategic and highly profitable acquisition prospect
Cloud and multi threaded proxy rankings
Local and mobile SEO

Threats:
We live and die by the search engines (mostly Google, somewhat Yahoo and Bing)--if they change their page structure, block our rank requests, or change their algorithms, etc, we could be in trouble (thus far we've always been able to adapt and turn these into an opportunity or competitive differentiator)
Running out of IPV4 IP addresses
One well heeled, well known competitor (authoritylabs.com), but they continue to disappoint clients and partners, many of whom come to us
Lots of small competitors, which could also be an opportunity
Less focus on rankings in the SEO world
Web analytics doesn't take rankings/SEO seriously
Social media
Paid search