Quantum Corp: which funds bought and sold
Institutions that bought and sold Quantum shares in Q2 2026, from the holdings they reported to the SEC on Form 13F for March 31, 2026 and June 30, 2026.
Between March 31, 2026 and June 30, 2026, 48 institutions that filed 13F reports for both quarters added to or opened positions in Quantum, and 14 cut or closed them. Together they added a net 12.9M shares, +867.2% on what they held at the start of the quarter. Active managers and hedge funds on our list were net buyers of 7.8M shares (+5351.3%); index fund managers were net buyers of 144K shares (+13.1%). 30 opened a new position and 8 sold out entirely.
Bought, Q2 2026 48 institutions, 30 of them new holders Sold, Q2 2026 14 institutions, 8 of them sold out
Net change, all compared +12.9M shares (+867.2%)
Net change, active managers +7.8M shares (+5351.3%), 17 bought, 0 sold
Buyers versus sellers
48 bought 4 14 sold
Active managers and hedge funds 17 bought · 0 sold · +7.8M
Index fund managers 6 bought · 0 sold · +144K
Other institutions 25 bought · 14 sold · +4.9M
Biggest buyers
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Alyeska Investment Group, L.P. Hedge fund | +2.7M New position | 2.7M | $29.2M |
| Two Seas Capital LP Hedge fund | +2.5M New position | 2.5M | $27.4M |
| Oaktree Capital Management LP | +2.0M New position | 2.0M | $22.1M |
| Neuberger Berman Group LLC Active manager | +1.2M New position | 1.2M | $12.8M |
| Ashford Capital Management Inc | +1.0M New position | 1.0M | $10.6M |
| Portolan Capital Management, LLC | +1.0M New position | 1.0M | $11.2M |
| Marshall Wace, LLP Hedge fund | +676K +1800.1% | 713K | $7.8M |
| Manatuck Hill Partners, LLC | +350K New position | 350K | $3.9M |
| Cinctive Capital Management LP Hedge fund | +183K New position | 183K | $2M |
| Renaissance Technologies LLC Hedge fund | +155K New position | 155K | $1.7M |
| Bank Of America Corp | +150K +730.5% | 170K | $1.9M |
| Walleye Capital LLC Hedge fund | +120K New position | 120K | $1.3M |
| Raymond James Financial Inc | +104K New position | 104K | $1.1M |
| Centiva Capital, LP Hedge fund | +100K New position | 100K | $1.1M |
| Kkm Financial LLC | +90K New position | 90K | $960,515 |
| Qube Research & Technologies Ltd Hedge fund | +81K New position | 81K | $890,747 |
| Sona Asset Management (US) LLC Active manager | +80K +114.0% | 150K | $1.6M |
| Susquehanna International Group, LLP | +70K New position | 70K | $767,525 |
| Man Group PLC Hedge fund | +69K New position | 69K | $754,523 |
| Vanguard Capital Management LLC Index funds | +66K +12.3% | 606K | $6.7M |
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Alyeska Investment Group, L.P. Hedge fund | +2.7M New position | 2.7M | $29.2M |
| Two Seas Capital LP Hedge fund | +2.5M New position | 2.5M | $27.4M |
| Neuberger Berman Group LLC Active manager | +1.2M New position | 1.2M | $12.8M |
| Marshall Wace, LLP Hedge fund | +676K +1800.1% | 713K | $7.8M |
| Cinctive Capital Management LP Hedge fund | +183K New position | 183K | $2M |
| Renaissance Technologies LLC Hedge fund | +155K New position | 155K | $1.7M |
| Walleye Capital LLC Hedge fund | +120K New position | 120K | $1.3M |
| Centiva Capital, LP Hedge fund | +100K New position | 100K | $1.1M |
| Qube Research & Technologies Ltd Hedge fund | +81K New position | 81K | $890,747 |
| Sona Asset Management (US) LLC Active manager | +80K +114.0% | 150K | $1.6M |
Biggest sellers
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| UBS Group AG | −53K −53.5% | 46K | $507,166 |
| LPL Financial LLC | −25K Sold out | 0 | — |
| R Squared Ltd | −12K Sold out | 0 | — |
| Barclays PLC | −12K −96.3% | 455 | $5,005 |
| Xtx Topco Ltd | −11K Sold out | 0 | — |
| Flagship Harbor Advisors, LLC | −6,181 −36.0% | 11K | $121,044 |
| Hollencrest Capital Management | −1,990 −99.5% | 10 | $110 |
| Sbi Securities Co., Ltd. | −934 −46.6% | 1,070 | $11,770 |
| Osaic Holdings, Inc. | −480 −49.7% | 485 | $5,339 |
| National Bank Of Canada | −100 Sold out | 0 | — |
| Rialto Wealth Management, LLC | −87 Sold out | 0 | — |
| Lavaca Capital LLC | −39 Sold out | 0 | — |
| Federation Des Caisses Desjardins Du Quebec | −25 Sold out | 0 | — |
| Activest Wealth Management | −1 Sold out | 0 | — |
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| None of the active managers on our list. | |||
New positions
| Institution | Shares | Value June 30, 2026 |
|---|---|---|
| Alyeska Investment Group, L.P.Hedge fund | 2.7M | $29.2M |
| Two Seas Capital LPHedge fund | 2.5M | $27.4M |
| Oaktree Capital Management LP | 2.0M | $22.1M |
| Neuberger Berman Group LLCActive manager | 1.2M | $12.8M |
| Portolan Capital Management, LLC | 1.0M | $11.2M |
| Ashford Capital Management Inc | 1.0M | $10.6M |
| Manatuck Hill Partners, LLC | 350K | $3.9M |
| Cinctive Capital Management LPHedge fund | 183K | $2M |
| Renaissance Technologies LLCHedge fund | 155K | $1.7M |
| Walleye Capital LLCHedge fund | 120K | $1.3M |
Sold out
| Institution | Shares | Value March 31, 2026 |
|---|---|---|
| LPL Financial LLC | 25K | $116,841 |
| R Squared Ltd | 12K | $58,164 |
| Xtx Topco Ltd | 11K | $53,775 |
| National Bank Of Canada | 100 | $475 |
| Rialto Wealth Management, LLC | 87 | $414 |
| Lavaca Capital LLC | 39 | $185 |
| Federation Des Caisses Desjardins Du Quebec | 25 | $119 |
| Activest Wealth Management | 1 | $4 |
Who holds the shares
- Institutions reporting
- 59
- Ten largest holders
- 85.7% of 13F-reported shares
- Index fund managers
- 8.6% of 13F-reported shares
- Active managers and hedge funds
- 55.5% of 13F-reported shares
| Type | Bought | Sold | New | Sold out | Net change in shares | Net % |
|---|---|---|---|---|---|---|
| Active managers and hedge funds | 17 | 0 | 13 | 0 | +7.8M | +5351.3% |
| Index fund managers | 6 | 0 | 0 | 0 | +144K | +13.1% |
| Other institutions | 25 | 14 | 17 | 8 | +4.9M | +2025.8% |