Usually, yes, though it depends on the publisher and the exact details of your contract. It will state exactly what you are giving them, usually something like "Exclusive Rights" where they are the only publisher for a certain time or "Electronic Rights" where they have the right to publish it in any electronic form. These deals usually have time limits and after those limits have been reached the publishing right will return to you.
For example though, if you sell your Electronic Rights you cannot publish a ebook of your work without the publisher's consent. As pointed out by some authors, it's borderline for them to even include an excerpt of one of their novels in their blog posts if they have Electronic Rights under contract.
It is possible you could sell your ownership, but it's very rare and would require them to have a great deal of interest in the property.