Forecasted JSE Top40 Index Weights

23 November 2018 | Joani van Wyk

Every quarter the JSE indices are rebalanced to reflect their characteristics. With each rebalance, some companies could be removed from an index with others taking their place. An important impact of index rebalancing Is that tracker funds that are tracking the index, need to rebalance accordingly to stay in line with the index. This results in selling pressure on the companies being removed from the index and buying for new additions. This effect has increased with the popularity of passive index trackers.

The index rebalancing rules for the Top40 index state that, when ranked by free float adjusted market cap, companies ranked smaller than 45th within the ALSI on the ranking date will be deleted from the Top40 index and companies ranked larger than 36th will be added to the index. Based on the 22nd November’s closing prices, MEI would be deleted from the Top40 index and PSG would be added to the index on the rebalance date. The table below shows the forecasted Top40 index weights after the index rebalance with PSG contributing 0.7%.


Important dates:

26 November 2018: Index ranking cut-off date

24 December 2018: Effective date

Note: The weights in the table are only estimates based on the 22nd of November’s closing prices. The final constituent list, free floats and SII will be released by the JSE on 7 December 2018.

In a previous article, some discounts in the market were identified and could prove to be useful if you are looking to rebalance your portfolio as well.

Get notified of new quantitative research & insights before the general public and receive exclusive market alerts sampled from those sent to paying Analytics Research subscribers:


We want to get to know you

* Required Fields


Joani van Wyk

Joani van Wyk joined the asset management team in January 2017, responsible for quantitative research of equities across all industries. Joani completed her degree in Mathematical Science in 2015, as well as an Honours degree in Financial Risk Management in 2016, both at the University of Stellenbosch. She is currently a CFA candidate.

The information contained in this article is for informational purposes only and must not be regarded as a prospectus for any security, financial product or transaction. It is neither to be construed as financial advice nor to be regarded as a definitive analysis of any financial issue. Investors should consider this research/article as only a single factor in making their investment decision. We recommend you consult a financial planner/advisor to take into account your particular investment objectives, financial situation and individual needs. The views and opinions (where expressed) in this article are those of the author and do not necessarily reflect the official policy or position of Sharenet.

Rate This Article

Your feedback is appreciated and helps us improve our content.

Thank you for helping us improve our content.

Rate This Article

Your feedback is appreciated and helps us improve our content.

Thank you for helping us improve our content.