HighTower Advisors Increases Stake in iShares Global 100 ETF HighTower Advisors LLC significantly boosted its holdings in iShares Global 100 ETF, increasing its position by 97.7% in Q4 2024. This move brought their total shares to 23,389, valued at $2.36 million. Other institutional investors also adjusted their stakes, reflecting growing institutional interest in this global ETF.12