The Zacks Rank has been produced weekly for over 15 years and was used exclusively by institutional investors managing billions of dollars in US equities until 1989, when the Zacks Rank was offered to individual investors. The Zacks Model Portfolio is maintained by Ben Zacks, president of Zacks Investment Management and represents Ben's suggestions for stocks that will show the most price appreciation over the next few months.
Many stocks are in both.
The primary differences between the Zacks Rank and the Z-100 portfolio are the number of stocks and turnover. The Z-100 portfolio was created by Ben Zacks specifically to reduce turnover. Lower turnover is equivalent to longer holding periods, that is, longer-term investing, which results in lower taxes and lower commission costs. The Zacks Rank and Z-100 Model Portfolio were first included in the printed Analyst Watch service which began publishing in 1989. Interactive Screening - the Zacks Rank is one of the items that can be used in Screening.