HighTower Advisors Expands Stake in Small-Cap Growth ETF HighTower Advisors LLC has increased its holdings in the iShares Morningstar Small-Cap Growth ETF by 0.8% during the fourth quarter, as per its latest SEC filing. The firm now owns 44,442 shares, valued at approximately $2.2 million. Other institutional investors also adjusted their positions, signaling growing interest in small-cap growth strategies.1