If you practice good SEO and employ all the tools in the editor and admin backend you should be fine. The “All” dynamic page of 1000+ will have a lot of data for search engines to sift through and a search on specific company may summon that page, but it will definitely pull the “Title” dynamic page for that company.
In this case the rule is keep it simple and clean and link out to the company and their sites online.
Try to also have companies link back to their page when possible.
Also, try to find a secondary description for these companies to identify them more uniquely, either by location, industry or other search critical markers and create additional directories, via different databases.
For example a location database and industry database could reference each other to create a link like this
[businessintexas.com/oil-companies-in](ind
businessintexas.com/oil-companies-in) -dallas/acme-oil
And headings like this
ACME OIL, DALAS, TEXAS
Oil Refinery
have links that say thinks like this
Visit Texas Oil Refinery Website
View Other Texas Oil Industry Websites
View Other Dallas, Texas Oil Industry Companies
And link out and cross-reference as much as you can.
I hope this helps.
Teejay