Store. Stock Manufacturing Company makes mens clothing. They are all made in Chicago, Illinois. And this is their best catalog yet. Stock Mfr Co. clothing can only be purchased only through their internet site. This season, they have some great buttondown flannel shirts which are perfect for this time of the year. Two years ago, Stock Manufacturing Company was just an idea who got its start through Kickstarter. Looking good, Stock! See the story of Stock MFR Co.