I just applied for the Ink Preferred as a sole proprietor. With respect to the question as to whether the sole proprietorship ever does business under another name, I found that the application refused to let me choose "no" for an answer. [?] I tried several different browsers, clearing cookies and several different means of applying (through my existing Chase account, through generic Chase ad, etc.) and kept running into the same frustrating problem. While this may or may not be accurate, I began to suspect that the limited choice had something to do with filling out the question above, which was what name do you want to be on the card. With that in mind, what finally worked for me was to skip both that question (desired name on card) and the question about alternative business names and proceed with the rest of the application. At the very end, the application returns you to any required boxes that you failed to complete. At that point, I was finally able to select "no" for the doing business as question, and then after that filled in the desired name for my card, and was able to successfully complete the application. (Pending as of right now). Just passing along my experience in case it is useful for others.