I would make the argument that most businesses help contribute to peace in an indirect, rather than direct, way. Most for-profit corporations biggest priority is to make a profit for their shareholders and stakeholders; peace is not the main driver. Academi (formerly Blackwater), Lockheed Martin, BAE Systems, and other defense companies and private military companies are perfect examples of delivering results to the stock and stakeholders before doing what's best of society, peace.
While most businesses don't directly work for peace, they indirectly can. Small companies and co-ops working in Haiti, Honduras, Kenya, Liberia, etc. help provide sources of income and relief for the dismal conditions in each country. By giving people the opportunity to work, they are less motivated to turn towards violence and the higher the income level in the country, generally less corruption occurs, which is a large factor in the creation and sustainment of violence in third world countries.