FTSE Russell removed a company tied to one of Indonesia's richest families from its global indexes over the weekend, sending shares sharply lower. The index provider cited concentrated shareholding as the reason, a governance concern that has gained attention among investors watching for ownership risks.

The delisting took effect after markets closed, catching traders off guard when trading resumed Monday. Funds that track FTSE Russell benchmarks face forced selling, adding to the downward pressure. The move shows how tight ownership structures can create real problems for companies seeking global capital.

For Indonesian billionaires building market credibility, this is a costly reminder. Concentrated shareholding now carries tangible consequences beyond policy talk. The stock drop reflects investor unease about how closely held structures affect a company's appeal to international funds.