This is a very good question. I have worked in finance for ten years and have gone through a lot of interviews. I never told anyone I stutter, except once. I usually stuttered significantly during the interviews and I have always gotten the job (and promotions). I think if it makes you more comfortable go ahead and tell them, but just try and be confident...own your stutter and honestly, the interviewer most likely will not care if you have a speech issue. Recently, over the last few years I have started talking to my boss about my stutter and advertising more openly...and the results have only been positive.