Rambus Inc: which funds bought and sold
Institutions that bought and sold Rambus 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, 318 institutions that filed 13F reports for both quarters added to or opened positions in Rambus, and 292 cut or closed them. Together they sold a net 4.0M shares, −3.9% on what they held at the start of the quarter. Active managers and hedge funds on our list were net buyers of 4.2M shares (+17.9%); index fund managers were net sellers of 4.6M shares (−11.6%). 128 opened a new position and 65 sold out entirely.
Bought, Q2 2026 318 institutions, 128 of them new holders Sold, Q2 2026 292 institutions, 65 of them sold out
Net change, all compared −4.0M shares (−3.9%)
Net change, active managers +4.2M shares (+17.9%), 38 bought, 38 sold
Buyers versus sellers
318 bought 63 292 sold
Active managers and hedge funds 38 bought · 38 sold · +4.2M
Index fund managers 3 bought · 9 sold · −4.6M
Other institutions 277 bought · 245 sold · −3.6M
Biggest buyers
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| FMR LLC Active manager | +7.1M +215.2% | 10.5M | $1.4B |
| D. E. Shaw & Co., Inc. Hedge fund | +727K +5676.7% | 740K | $98.2M |
| Manufacturers Life Insurance Company, The | +695K +678.5% | 797K | $106M |
| Susquehanna International Group, LLP | +470K +547.8% | 556K | $73.8M |
| HRT Financial LP | +423K New position | 423K | $56.2M |
| Citadel Advisors LLC Hedge fund | +384K +2325.9% | 400K | $53.1M |
| Westfield Capital Management Co LP Active manager | +371K +2572.6% | 386K | $51.2M |
| Maple Rock Capital Partners Inc. Hedge fund | +343K New position | 343K | $45.5M |
| Millennium Management LLC Hedge fund | +332K +234.6% | 473K | $62.8M |
| Jpmorgan Chase & Co | +265K +14.4% | 2.1M | $261M |
| Gilder Gagnon Howe & Co LLC Active manager | +257K New position | 257K | $34.2M |
| Rafferty Asset Management, LLC Index funds | +239K +32.0% | 984K | $131M |
| Morgan Stanley | +231K +19.0% | 1.4M | $192M |
| William Blair Investment Management, LLC Active manager | +200K New position | 200K | $26.6M |
| Mackenzie Financial Corp | +189K +351.1% | 242K | $32.1M |
| Duquesne Family Office LLC Hedge fund | +173K New position | 173K | $23M |
| Tudor Investment Corp Et Al Hedge fund | +157K New position | 157K | $20.9M |
| Allianz Asset Management Gmbh | +154K +172.9% | 243K | $28.2M |
| Two Sigma Investments, LP Hedge fund | +146K +188.0% | 223K | $29.6M |
| Royal Bank Of Canada | +140K +473.7% | 169K | $22.5M |
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| FMR LLC Active manager | +7.1M +215.2% | 10.5M | $1.4B |
| D. E. Shaw & Co., Inc. Hedge fund | +727K +5676.7% | 740K | $98.2M |
| Citadel Advisors LLC Hedge fund | +384K +2325.9% | 400K | $53.1M |
| Westfield Capital Management Co LP Active manager | +371K +2572.6% | 386K | $51.2M |
| Maple Rock Capital Partners Inc. Hedge fund | +343K New position | 343K | $45.5M |
| Millennium Management LLC Hedge fund | +332K +234.6% | 473K | $62.8M |
| Gilder Gagnon Howe & Co LLC Active manager | +257K New position | 257K | $34.2M |
| William Blair Investment Management, LLC Active manager | +200K New position | 200K | $26.6M |
| Duquesne Family Office LLC Hedge fund | +173K New position | 173K | $23M |
| Tudor Investment Corp Et Al Hedge fund | +157K New position | 157K | $20.9M |
Biggest sellers
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| T. Rowe Price Investment Management, Inc. Active manager | −2.4M Sold out | 0 | — |
| Blackrock, Inc. Index funds | −2.3M −14.4% | 14.0M | $1.9B |
| Edgepoint Investment Group Inc. Active manager | −862K −44.2% | 1.1M | $144M |
| Geode Capital Management, LLC Index funds | −827K −26.5% | 2.3M | $305M |
| Hood River Capital Management LLC | −727K Sold out | 0 | — |
| Voya Investment Management LLC | −666K −87.0% | 100K | $13.2M |
| Ameriprise Financial Inc | −654K −67.1% | 321K | $42.6M |
| UBS Group AG | −583K −60.9% | 374K | $49.6M |
| Vanguard Portfolio Management LLC Index funds | −576K −8.7% | 6.1M | $806M |
| Congress Asset Management Co Active manager | −498K −39.0% | 778K | $103M |
| Citigroup Inc | −475K −47.2% | 532K | $70.7M |
| State Street Corp Index funds | −459K −10.5% | 3.9M | $519M |
| Barclays PLC | −450K −41.0% | 646K | $85.7M |
| Wellington Management Group LLP Active manager | −438K −51.1% | 419K | $55.6M |
| Panagora Asset Management Inc Active manager | −426K −97.7% | 10K | $1.4M |
| Nuveen, LLC | −396K −44.4% | 496K | $65.9M |
| Northern Trust Corp Index funds | −385K −28.9% | 949K | $126M |
| Schwartz Investment Counsel Inc | −320K −76.2% | 100K | $13.3M |
| Franklin Resources Inc Active manager | −249K −77.1% | 74K | $9.8M |
| Emerald Advisers, LLC | −241K −48.8% | 253K | $33.5M |
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| T. Rowe Price Investment Management, Inc. Active manager | −2.4M Sold out | 0 | — |
| Edgepoint Investment Group Inc. Active manager | −862K −44.2% | 1.1M | $144M |
| Congress Asset Management Co Active manager | −498K −39.0% | 778K | $103M |
| Wellington Management Group LLP Active manager | −438K −51.1% | 419K | $55.6M |
| Panagora Asset Management Inc Active manager | −426K −97.7% | 10K | $1.4M |
| Franklin Resources Inc Active manager | −249K −77.1% | 74K | $9.8M |
| Loomis Sayles & Co L P Active manager | −189K −28.6% | 471K | $62.5M |
| Federated Hermes, Inc. Active manager | −180K −83.5% | 36K | $4.7M |
| Steadfast Capital Management LP Hedge fund | −153K Sold out | 0 | — |
| Alliancebernstein L.P. Active manager | −112K −41.9% | 155K | $13.3M |
New positions
| Institution | Shares | Value June 30, 2026 |
|---|---|---|
| HRT Financial LP | 423K | $56.2M |
| Maple Rock Capital Partners Inc.Hedge fund | 343K | $45.5M |
| Gilder Gagnon Howe & Co LLCActive manager | 257K | $34.2M |
| William Blair Investment Management, LLCActive manager | 200K | $26.6M |
| Duquesne Family Office LLCHedge fund | 173K | $23M |
| Tudor Investment Corp Et AlHedge fund | 157K | $20.9M |
| Nomura Holdings Inc | 101K | $13.4M |
| Qube Research & Technologies LtdHedge fund | 90K | $11.9M |
| Catalyst Funds Management Pty Ltd | 89K | $11.8M |
| Treasurer Of The State Of North Carolina | 46K | $6.1M |
Sold out
| Institution | Shares | Value March 31, 2026 |
|---|---|---|
| T. Rowe Price Investment Management, Inc.Active manager | 2.4M | $206M |
| Hood River Capital Management LLC | 727K | $62.6M |
| Steadfast Capital Management LPHedge fund | 153K | $13.2M |
| TD Asset Management Inc | 120K | $10.3M |
| Tairen Capital Ltd | 120K | $10.3M |
| Osterweis Capital Management Inc | 85K | $7.3M |
| Fred Alger Management, LLCActive manager | 67K | $5.8M |
| Munro PartnersActive manager | 64K | $5.5M |
| Thornburg Investment Management IncActive manager | 58K | $5M |
| Holocene Advisors, LPHedge fund | 50K | $4.3M |
Who holds the shares
- Institutions reporting
- 615
- Ten largest holders
- 55.1% of 13F-reported shares
- Index fund managers
- 35.0% of 13F-reported shares
- Active managers and hedge funds
- 27.8% of 13F-reported shares
| Type | Bought | Sold | New | Sold out | Net change in shares | Net % |
|---|---|---|---|---|---|---|
| Active managers and hedge funds | 38 | 38 | 18 | 9 | +4.2M | +17.9% |
| Index fund managers | 3 | 9 | 0 | 0 | −4.6M | −11.6% |
| Other institutions | 277 | 245 | 110 | 56 | −3.6M | −9.3% |