Ranking multiple domains in the SERPS for same keywords?

[iAnalyst.com]

Curious if anyone has had success ranking multiple sites with same whois and server info? We have a client who has purchased multiple businesses over the years in the same industry.

Each site has a solid amount of link popularity already and good respected Brand. But I'm wondering with the whois info being the same and the same servers, if ranking for multiple domains will be worth attempting.

[stevenmusumeche]

I think you're going to run into trouble.  If you insist on keeping them separate, you need to be good at covering your tracks.  Otherwise, you could do it the white hat way and 301 all those domains to your main domain.  But, you would lose the built up branding of those other businesses.

[AdamThompson]

I have been able to get a couple domains ranked for the same (low to moderate competition) keyword before. They had same whois and server.