| 4 |
| VANGUARD PORTFOLIO MANAGEMENT LLC |
| 4.9M |
| $402.0M |
| +2.6% |
| 5.941% |
| 0.02% |
| 5 | STATE STREET CORP | 4.6M | $375.1M | +5.8% | 5.544% | 0.01% |
| 6 | WELLINGTON MANAGEMENT GROUP LLP | 4.1M | $336.7M | +4.7% | 4.977% | 0.06% |
| 7 | VANGUARD CAPITAL MANAGEMENT LLC | 3.7M | $305.0M | +1.7% | 4.508% | 0.01% |
| 8 | GEODE CAPITAL MANAGEMENT, LLC | 2.2M | $180.1M | -0.1% | 2.661% | 0.01% |
| 9 | TORONTO DOMINION BANK | 2.2M | $176.7M | -28.4% | 2.611% | 0.20% |
| 10 | WESTFIELD CAPITAL MANAGEMENT CO LP | 2.0M | $159.6M | β | 2.358% | 0.52% |
| 11 | Hood River Capital Management LLC | 1.7M | $141.8M | +4.5% | 2.096% | 1.03% |
| 12 | ARMISTICE CAPITAL, LLC | 1.7M | $141.2M | -29.8% | 2.087% | 1.73% |
| 13 | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | 1.7M | $140.5M | β | 2.077% | 0.42% |
| 14 | D. E. Shaw & Co., Inc. | 1.5M | $126.3M | -5.6% | 1.867% | 0.06% |
| 15 | TANG CAPITAL MANAGEMENT LLC | 1.5M | $122.4M | 0.0% | 1.808% | 5.56% |
| 16 | BANK OF AMERICA CORP /DE/ | 1.5M | $118.5M | -23.0% | 1.751% | 0.01% |
| 17 | DRIEHAUS CAPITAL MANAGEMENT LLC | 1.4M | $117.5M | +41.8% | 1.736% | 0.68% |
| 18 | FMR LLC | 1.4M | $114.1M | -8.5% | 1.686% | 0.00% |
| 19 | Jefferies Financial Group Inc. | 1.4M | $110.7M | +0.2% | 1.636% | 0.73% |
| 20 | FULLER & THALER ASSET MANAGEMENT, INC. | 1.2M | $94.4M | β | 1.395% | 0.26% |
| 21 | Pictet Asset Management Holding SA | 1.1M | $93.6M | -3.0% | 1.384% | 0.09% |
| 22 | MORGAN STANLEY | 1.1M | $90.0M | +63.7% | 1.331% | 0.00% |
| 23 | Blue Sparrow, LLC /DE | 1.1M | $85.7M | +451.3% | 1.267% | 0.83% |
| 24 | FRANKLIN RESOURCES INC | 1.0M | $83.8M | -8.4% | 1.238% | 0.02% |
| 25 | Invesco Ltd. | 942K | $76.8M | +8.8% | 1.135% | 0.01% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in PTCT β a direct measure of their conviction.
| 98.66% |
| 2.03 pp |
| $3.89B |
| +18% |
| Q4 2024 | 240 | +19% | 100.69% | 2.18 pp | $3.30B | +20% |
| Q3 2024 | 202 | β | 102.87% | β | $2.74B | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
70 institutions opened new positions in PTCT during Q2 2026, while 43 fully exited. 239 added to existing positions and 64 trimmed.
PTCT institutional ownership rose by 5.43 percentage points quarter-over-quarter, with a net change of +32 holders.
The top 10 institutions account for 53.4% of all reported 13F value in PTCT, and the top 25 account for 74.0%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
PTC Therapeutics, Inc. (PTCT) Institutional Ownership