PTC Therapeutics, Inc.: which funds bought and sold
Institutions that bought and sold PTC Therapeutics 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, 213 institutions that filed 13F reports for both quarters added to or opened positions in PTC Therapeutics, and 157 cut or closed them. Together they added a net 4.8M shares, +5.4% on what they held at the start of the quarter. Active managers and hedge funds on our list were net buyers of 4.0M shares (+13.6%); index fund managers were net buyers of 1.6M shares (+5.2%). 71 opened a new position and 44 sold out entirely.
Bought, Q2 2026 213 institutions, 71 of them new holders Sold, Q2 2026 157 institutions, 44 of them sold out
Net change, all compared +4.8M shares (+5.4%)
Net change, active managers +4.0M shares (+13.6%), 30 bought, 31 sold
Buyers versus sellers
213 bought 50 157 sold
Active managers and hedge funds 30 bought · 31 sold · +4.0M
Index fund managers 8 bought · 4 sold · +1.6M
Other institutions 175 bought · 122 sold · −791K
Biggest buyers
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Westfield Capital Management Co LP Active manager | +2.0M New position | 2.0M | $160M |
| William Blair Investment Management, LLC Active manager | +1.7M New position | 1.7M | $141M |
| Fuller & Thaler Asset Management, Inc. | +1.2M New position | 1.2M | $94.4M |
| Blackrock, Inc. Index funds | +1.0M +7.8% | 14.0M | $1.1B |
| Blue Sparrow, LLC | +860K +451.3% | 1.1M | $85.7M |
| Price T Rowe Associates Inc Active manager | +639K +134.6% | 1.1M | $90.9M |
| Arrowstreet Capital, Limited Partnership Hedge fund | +543K +486.2% | 654K | $53.4M |
| American Century Companies Inc Active manager | +496K +9913.9% | 501K | $40.9M |
| Morgan Stanley | +430K +63.7% | 1.1M | $90M |
| Driehaus Capital Management LLC Active manager | +424K +41.8% | 1.4M | $117M |
| Citadel Advisors LLC Hedge fund | +363K +94.1% | 748K | $61M |
| Jpmorgan Chase & Co | +338K +97.7% | 684K | $56.1M |
| Federated Hermes, Inc. Active manager | +258K +114.0% | 483K | $39.4M |
| State Street Corp Index funds | +252K +5.8% | 4.6M | $375M |
| Marshall Wace, LLP Hedge fund | +244K +53.0% | 705K | $57.5M |
| Voya Investment Management LLC | +197K +57.4% | 539K | $44M |
| Renaissance Technologies LLC Hedge fund | +190K +35.7% | 724K | $59M |
| Susquehanna International Group, LLP | +188K +90.3% | 396K | $32.3M |
| Wellington Management Group LLP Active manager | +186K +4.7% | 4.1M | $337M |
| Hudson Bay Capital Management LP Hedge fund | +156K +4253.6% | 160K | $13M |
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Westfield Capital Management Co LP Active manager | +2.0M New position | 2.0M | $160M |
| William Blair Investment Management, LLC Active manager | +1.7M New position | 1.7M | $141M |
| Price T Rowe Associates Inc Active manager | +639K +134.6% | 1.1M | $90.9M |
| Arrowstreet Capital, Limited Partnership Hedge fund | +543K +486.2% | 654K | $53.4M |
| American Century Companies Inc Active manager | +496K +9913.9% | 501K | $40.9M |
| Driehaus Capital Management LLC Active manager | +424K +41.8% | 1.4M | $117M |
| Citadel Advisors LLC Hedge fund | +363K +94.1% | 748K | $61M |
| Federated Hermes, Inc. Active manager | +258K +114.0% | 483K | $39.4M |
| Marshall Wace, LLP Hedge fund | +244K +53.0% | 705K | $57.5M |
| Renaissance Technologies LLC Hedge fund | +190K +35.7% | 724K | $59M |
Biggest sellers
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| UBS Group AG | −1.1M −80.8% | 262K | $21.4M |
| Armistice Capital, LLC Hedge fund | −1.0M −48.4% | 1.1M | $87.4M |
| Toronto Dominion Bank | −860K −28.4% | 2.2M | $177M |
| Woodline Partners LP Hedge fund | −745K Sold out | 0 | — |
| BNP Paribas Financial Markets | −542K −58.9% | 379K | $30.9M |
| Balyasny Asset Management L.P. Hedge fund | −440K −95.5% | 21K | $1.7M |
| Bank Of America Corp | −435K −23.0% | 1.5M | $118M |
| Mackenzie Financial Corp | −314K −90.9% | 31K | $2.6M |
| SG Americas Securities, LLC | −274K −31.2% | 606K | $49.4M |
| Panagora Asset Management Inc Active manager | −262K −74.7% | 89K | $7.3M |
| Dimensional Fund Advisors LP | −253K −28.4% | 638K | $52M |
| DZ Bank AG Deutsche Zentral Genossenschafts Bank, Frankfurt Am Main | −213K Sold out | 0 | — |
| Goldman Sachs Group Inc | −209K −25.3% | 618K | $50.4M |
| Qube Research & Technologies Ltd Hedge fund | −202K −39.4% | 311K | $25.4M |
| Schonfeld Strategic Advisors LLC Hedge fund | −171K −53.7% | 147K | $12M |
| FMR LLC Active manager | −130K −8.5% | 1.4M | $114M |
| Neuberger Berman Group LLC Active manager | −116K −95.3% | 5,771 | $470,740 |
| Capital Fund Management S.A. Hedge fund | −107K −88.5% | 14K | $1.1M |
| HSBC Holdings PLC | −96K −42.1% | 131K | $10.8M |
| Franklin Resources Inc Active manager | −94K −8.4% | 1.0M | $83.8M |
| Institution | Change in shares | Shares June 30, 2026 | Value |
|---|---|---|---|
| Armistice Capital, LLC Hedge fund | −1.0M −48.4% | 1.1M | $87.4M |
| Woodline Partners LP Hedge fund | −745K Sold out | 0 | — |
| Balyasny Asset Management L.P. Hedge fund | −440K −95.5% | 21K | $1.7M |
| Panagora Asset Management Inc Active manager | −262K −74.7% | 89K | $7.3M |
| Qube Research & Technologies Ltd Hedge fund | −202K −39.4% | 311K | $25.4M |
| Schonfeld Strategic Advisors LLC Hedge fund | −171K −53.7% | 147K | $12M |
| FMR LLC Active manager | −130K −8.5% | 1.4M | $114M |
| Neuberger Berman Group LLC Active manager | −116K −95.3% | 5,771 | $470,740 |
| Capital Fund Management S.A. Hedge fund | −107K −88.5% | 14K | $1.1M |
| Franklin Resources Inc Active manager | −94K −8.4% | 1.0M | $83.8M |
New positions
| Institution | Shares | Value June 30, 2026 |
|---|---|---|
| Westfield Capital Management Co LPActive manager | 2.0M | $160M |
| William Blair Investment Management, LLCActive manager | 1.7M | $141M |
| Fuller & Thaler Asset Management, Inc. | 1.2M | $94.4M |
| Longaeva Partners L.P. | 112K | $9.1M |
| Capricorn Fund Managers Ltd | 64K | $5.2M |
| Exoduspoint Capital Management, LPHedge fund | 57K | $4.7M |
| Millennium Management LLCHedge fund | 46K | $3.8M |
| Quadrature Capital LtdHedge fund | 44K | $3.6M |
| Jump Financial, LLC | 33K | $2.7M |
| Hussman Strategic Advisors, Inc. | 32K | $2.6M |
Sold out
| Institution | Shares | Value March 31, 2026 |
|---|---|---|
| Woodline Partners LPHedge fund | 745K | $50.8M |
| DZ Bank AG Deutsche Zentral Genossenschafts Bank, Frankfurt Am Main | 213K | $14.5M |
| Bi Asset Management Fondsmaeglerselskab A/S | 82K | $5.6M |
| Picton Mahoney Asset Management | 53K | $3.6M |
| Group One Trading LLC | 53K | $3.6M |
| Illinois Municipal Retirement Fund | 42K | $2.9M |
| Private Capital Advisors, Inc. | 39K | $2.7M |
| Elo Mutual Pension Insurance Co | 19K | $1.3M |
| Drw Securities, LLC | 18K | $1.2M |
| Sierra Summit Advisors LLC | 12K | $803,253 |
Who holds the shares
- Institutions reporting
- 380
- Ten largest holders
- 52.5% of 13F-reported shares
- Index fund managers
- 31.8% of 13F-reported shares
- Active managers and hedge funds
- 33.1% of 13F-reported shares
| Type | Bought | Sold | New | Sold out | Net change in shares | Net % |
|---|---|---|---|---|---|---|
| Active managers and hedge funds | 30 | 31 | 13 | 2 | +4.0M | +13.6% |
| Index fund managers | 8 | 4 | 0 | 0 | +1.6M | +5.2% |
| Other institutions | 175 | 122 | 58 | 42 | −791K | −2.8% |