This really, really comes down to the contract under which the articles were submitted. I've worked for several niche periodical publishers - both online and hardcopy - and have seen all kinds of terms:
- the publisher "bought" the article from the author, who retains no rights to it
- the publisher has exclusive right of publication (a subtle but occasionally important difference from the previous terms)
- the publisher has exclusive right of publication, unless it doesn't get published and/or the author isn't paid, at which time the rights revert to the author
- the publisher has exclusive right of publication in one or more specific media (for example, only they can publish it online, but the author could put it in a print book)
- the publisher has right of first publication (and the author can freely republish it after some time period has elapsed)
- and so on.
If you don't have contracts for your articles, ask the publisher(s) for a copy of the terms in effect at the time your articles were submitted. If they can't provide the terms, talk to a lawyer about the default conditions for your locality.
For any future articles, get a contract. Boilerplate article contracts are - as legal documents go - short, simple, and cheap to get drawn up (since the publisher really just gets one contract written and then plays fill-in-the-blank for each article they accept), so there really isn't any good reason for a publisher to not have one.
Also, I'm assuming that by "profile", you mean an online site that anyone could visit to see your work. If, however, we were talking about something more like a hard copy CV - say, print outs of your articles in a binder you could hand to a prospective employer - that falls under fair use.