Chile’s Main Stock Index Changes Hands, and Gains a Member on 1 September

Chile's main stock index, IPSA, will change from 1 September 2026, with MSCI taking over administration from S&P Dow Jones Indices. The new fixed 30-stock ceiling will disappear, and the index will no longer have a set number of constituents, instead membership will be determined by size and liquidity thresholds. The weighting of the index will also move to free-float adjusted market capitalisation, meaning the weight of each company will reflect the shares genuinely available to buy rather than its total shares outstanding.

This change is particularly relevant for Chilean listed companies, which are unusually concentrated and hold large blocks that rarely trade. As a result, weighting by free float will correct this issue. The first consequence of the change is that Pampa Investments, formerly known as Oro Blanco, will return to the index, bringing the count to 31.

Francisca Ponce, daughter of Julio Ponce Lerou, is leading Pampa Investments and has been preparing an international roadshow to bring foreign investors onto the register. Chile's equity funds and emerging markets funds with Chilean exposure will be affected, as they will have to hold what the index holds, generating buying without reflecting investors' views of the company.

Free-float weighting will result in reduced index weight for tightly held companies and increased weight for those with wider public ownership. The move to MSCI's methodology is seen as a credibility move, as it is built to a familiar standard, easier to benchmark against, build products on and explain to committees in London.