This article is first in a series that provides an ongoing analysis of the changes made to Ariel Investments' 13F stock portfolio on a quarterly basis. It is based on Ariel Investments' regulatory 13F Form filed on 02/14/2020. John Rogers' 13F portfolio value increased ~6% from $7.51B to $7.97B this quarter. The portfolio is diversified with recent 13F reports showing around 150 positions. There are 68 securities that are significantly large (more than ~0.5% of the portfolio each) and they are the focus of this article. The largest five stakes are Microsoft Corp. (MSFT), Philip