Verastem, Inc. (VSTM) Institutional Ownership

Ownership Summary

Verastem, Inc. (NASDAQ:VSTM) showed up in the 13F filings of 155 institutional investors as of March 2026.

• Their combined ownership stood at 82.8% of outstanding shares in March 2026, down from 113.1% in December 2025.
• Their total shares held in VSTM increased 31.77% from the prior quarter, while the number of investors in Verastem increased 56.57% year over year.
• During the quarter, 108 of these 155 funds increased positions in VSTM, 29 reduced exposure, and 18 held steady.
• In total, institutional investors held 81.38Mn shares in Verastem as of March 2026, up by 19.62Mn shares quarter on quarter, and up 35.18Mn shares year over year.
• As of March 31, 2026, RTW INVESTMENTS, LP held the largest stake in Verastem with 6.58Mn shares, accounting for 6.69% of total shares outstanding.
• The largest buyers of Verastem for the quarter ending March 2026 were VANGUARD CAPITAL MANAGEMENT LLC (3.32Mn), Nantahala Capital Management, LLC (3.12Mn), Alyeska Investment Group, L.P. (2.05Mn), AIGH Capital Management LLC (2.0Mn), MILLENNIUM MANAGEMENT LLC (1.86Mn).
• The largest sellers of Verastem for the quarter ending March 2026 were BALYASNY ASSET MANAGEMENT L.P. (2.79Mn), Goldman Sachs Group Inc (1.51Mn), Logos Global Management LP (700.0K), Citigroup Inc (352.18K), D. E. Shaw & Co., Inc. (312.19K).
• Verastem's 10 largest shareholders as of March 2026 include RTW INVESTMENTS, LP (6.58Mn), BlackRock, Inc. (6.19Mn), Deep Track Capital, LP (5.74Mn), ARMISTICE CAPITAL, LLC (4.59Mn), Nantahala Capital Management, LLC (3.58Mn), State Street Corp (3.52Mn), VANGUARD CAPITAL MANAGEMENT LLC (3.32Mn), Stonepine Capital Management, LLC (3.3Mn), Foresite Capital Management VI LLC (3.15Mn), MILLENNIUM MANAGEMENT LLC (2.41Mn) per Business Quant data.