Borsa İstanbul has made revision in article 5 of BIST Sustainability Index Ground Rules, to include volunteering companies of BIST 100 Index within the considerations for the “list of companies subject to assessment”, in addition to BIST 50 Index constituents.
You can find the latest version of BIST Sustainability Index Ground Rules here: http://www.borsaistanbul.com/docs/default-source/endeksler/bist-sustainability-index-ground-rules.pdf?sfvrsn=4
For BIST SustainabilityIndex click here: http://www.borsaistanbul.com/docs/default-source/endeksler/bist-sustainability-index-ground-rules.pdf?sfvrsn=4