They may not be global giants, but the three firms suggested above are definitely the ones to go for if you just want to work exclusively in the cap markets/derivs space. m.a partners has more of a transatlantic focus (NY-LON-AMS). Capco is a more 'global' with a presence in N.America, Europe and Asia - they might actually be doing more in asia now they have hooked up with Symphony. City Practs are predominantly in London - and I heard recently that they might be narrowing their focus further.The MBA is all well and good, but most recruiters will value your experience, rather than your qualifications. Every other consultant has one, so it's not as if you'll be singled out as being particularly special.