A 401(k)? You never thought it could work for your small business. Then the Pioneer Uni-K Plan® comes along - a 401(k) designed specifically for owner-only businesses. With features like higher maximum contribution levels, loans, and the ability to consolidate your other retirement accounts, this plan is something completely different. From the company thats been finding new ways to help investors plan for retirement since 1928. The Pioneer Uni-K Plan®.