Quantum Corp /De/ (QMCO) Institutional Ownership

Ownership Summary

Quantum Corp /De/ (NASDAQ:QMCO) has 37 institutional investors that have filed 13F reports for the period ending March 2026.

• These investors held 12.7% of outstanding shares in March 2026, down from 14.9% in December 2025.
• Their total shares held in QMCO increased 87.04% quarter over quarter, and separately, investors owning Quantum increased 23.33% from a year ago.
• Of these 37 funds, 19 grew their exposure to Quantum, 11 cut back, and 7 maintained positions.
• Altogether, these fund groups held 1.61Mn shares in QMCO by March 2026, up by 749.56K shares quarter on quarter, and down 79.71K shares year over year.
• VANGUARD CAPITAL MANAGEMENT LLC holds the largest position in QMCO at 539.28K shares as of March 31, 2026, or 4.25% of shares outstanding.
• Top purchasers of QMCO stock for the quarter ending March 2026 included VANGUARD CAPITAL MANAGEMENT LLC (539.28K), VANGUARD FIDUCIARY TRUST CO (80.26K), SONA ASSET MANAGEMENT (US) LLC (70.09K), Cygnus Capital Advisors, LLC (54.66K), PRICE T ROWE ASSOCIATES INC /MD/ (21.8K).
• The largest sales of QMCO for the quarter ending March 2026 came from UBS Group AG (66.77K), State Street Corp (17.9K), FLAGSHIP HARBOR ADVISORS, LLC (9.4K), BlackRock, Inc. (3.21K), Barclays Plc (1.75K).
• Quantum's 10 largest shareholders as of March 2026 include VANGUARD CAPITAL MANAGEMENT LLC (539.28K), BlackRock, Inc. (217.53K), GEODE CAPITAL MANAGEMENT, LLC (159.18K), Cygnus Capital Advisors, LLC (124.09K), UBS Group AG (99.07K), VANGUARD FIDUCIARY TRUST CO (80.26K), State Street Corp (72.81K), SONA ASSET MANAGEMENT (US) LLC (70.09K), MARSHALL WACE, LLP (37.53K), Northern Trust Corp (28.76K) per Business Quant data.