Who owns PTC Therapeutics (PTCT)
Which tracked institutional funds hold PTCT, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See PTCT company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
139 tracked funds added or opened PTCT while 72 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
PTCT’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes PTCT more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in PTCT divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 352 tracked filers holding PTCT, 202 increased or opened the position and 171 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in PTCT between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 26
- Jupiter Topco LLC$590M
- WESTFIELD CAPITAL MANAGEMENT CO LP$160M
- WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC$141M
- FULLER & THALER ASSET MANAGEMENT, INC.$94M
- Ovata Capital Management Ltd$22M
- Longaeva Partners L.P.$9M
Full exits 31
- JANUS HENDERSON GROUP PLC$490M
- SG Americas Securities, LLC$60M
- Woodline Partners LP$51M
- LORD, ABBETT & CO. LLC$42M
- DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main$15M
- BI Asset Management Fondsmaeglerselskab A/S$6M
Largest adds
- BlackRock, Inc.$358M
- RTW INVESTMENTS, LP$104M
- STATE STREET CORP$79M
- VANGUARD PORTFOLIO MANAGEMENT LLC$75M
- Blue Sparrow, LLC /DE$73M
- WELLINGTON MANAGEMENT GROUP LLP$69M
Largest trims
- UBS Group AG$72M
- ARMISTICE CAPITAL, LLC$54M
- BNP PARIBAS FINANCIAL MARKETS$32M
- BALYASNY ASSET MANAGEMENT L.P.$30M
- TORONTO DOMINION BANK$29M
- MACKENZIE FINANCIAL CORP$21M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| Ovata Capital Management Ltd new | 14,080,000 | $22M | 0.3% | 2026-Q2 |
| BlackRock, Inc. added | 13,964,554 | $1.1B | 14.5% | 2026-Q2 |
| RTW INVESTMENTS, LP | 7,746,415 | $632M | 8.0% | 2026-Q2 |
| Jupiter Topco LLC new | 7,236,402 | $590M | 7.5% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 4,928,111 | $402M | 5.1% | 2026-Q2 |
| STATE STREET CORP added | 4,598,952 | $375M | 4.8% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP added | 4,128,273 | $337M | 4.3% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 3,739,127 | $305M | 3.9% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC trimmed | 2,207,376 | $180M | 2.3% | 2026-Q2 |
| TORONTO DOMINION BANK trimmed | 2,165,846 | $177M | 2.2% | 2026-Q2 |
| WESTFIELD CAPITAL MANAGEMENT CO LP added | 1,956,156 | $160M | 2.0% | 2026-Q2 |
| Hood River Capital Management LLC added | 1,738,613 | $142M | 1.8% | 2026-Q2 |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC new | 1,722,688 | $141M | 1.8% | 2026-Q2 |
| D. E. Shaw & Co., Inc. trimmed | 1,548,919 | $126M | 1.6% | 2026-Q2 |
| TANG CAPITAL MANAGEMENT LLC | 1,500,000 | $122M | 1.6% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 1,452,277 | $118M | 1.5% | 2026-Q2 |
| Driehaus Capital Management LLC added | 1,440,107 | $117M | 1.5% | 2026-Q2 |
| FMR LLC trimmed | 1,398,261 | $114M | 1.4% | 2026-Q2 |
| Jefferies Financial Group Inc. added | 1,357,042 | $111M | 1.4% | 2026-Q2 |
| FULLER & THALER ASSET MANAGEMENT, INC. new | 1,156,819 | $94M | 1.2% | 2026-Q2 |
| Pictet Asset Management Holding SA trimmed | 1,147,844 | $94M | 1.2% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 1,114,516 | $91M | 1.2% | 2026-Q2 |
| MORGAN STANLEY added | 1,103,675 | $90M | 1.1% | 2026-Q2 |
| ARMISTICE CAPITAL, LLC trimmed | 1,071,395 | $87M | 1.1% | 2026-Q2 |
| Blue Sparrow, LLC /DE added | 1,050,700 | $86M | 1.1% | 2026-Q2 |
| FRANKLIN RESOURCES INC trimmed | 1,027,327 | $84M | 1.1% | 2026-Q2 |
| Invesco Ltd. added | 941,581 | $77M | 1.0% | 2026-Q2 |
| Palo Alto Investors LP trimmed | 918,846 | $75M | 1.0% | 2026-Q2 |
| NORTHERN TRUST CORP added | 880,029 | $72M | 0.9% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 790,112 | $64M | 0.8% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 747,822 | $61M | 0.8% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC added | 723,500 | $59M | 0.8% | 2026-Q2 |
| Boston Partners added | 718,574 | $59M | 0.7% | 2026-Q2 |
| JUPITER ASSET MANAGEMENT LTD trimmed | 707,450 | $58M | 0.7% | 2026-Q2 |
| MARSHALL WACE, LLP added | 704,787 | $57M | 0.7% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 684,042 | $56M | 0.7% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 654,382 | $53M | 0.7% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 637,704 | $52M | 0.7% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 618,247 | $50M | 0.6% | 2026-Q2 |
| LOOMIS SAYLES & CO L P added | 590,374 | $48M | 0.6% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 587,887 | $48M | 0.6% | 2026-Q2 |
| Nuveen, LLC trimmed | 583,829 | $48M | 0.6% | 2026-Q2 |
| Bank of New York Mellon Corp added | 553,462 | $45M | 0.6% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC added | 541,635 | $44M | 0.6% | 2026-Q2 |
| VOYA INVESTMENT MANAGEMENT LLC added | 539,319 | $44M | 0.6% | 2026-Q2 |
| Ensign Peak Advisors, Inc trimmed | 508,056 | $41M | 0.5% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 500,995 | $41M | 0.5% | 2026-Q2 |
| FEDERATED HERMES, INC. added | 483,424 | $39M | 0.5% | 2026-Q2 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE added | 441,957 | $36M | 0.5% | 2026-Q2 |
| Parkman Healthcare Partners LLC added | 435,691 | $36M | 0.5% | 2026-Q2 |
| Defilade Capital Management, L.P. added | 433,699 | $35M | 0.4% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 418,025 | $34M | 0.4% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 395,662 | $32M | 0.4% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 378,720 | $31M | 0.4% | 2026-Q2 |
| Legal & General Group Plc added | 352,734 | $29M | 0.4% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC trimmed | 332,251 | $27M | 0.3% | 2026-Q2 |
| Qube Research & Technologies Ltd trimmed | 311,374 | $25M | 0.3% | 2026-Q2 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. trimmed | 303,685 | $25M | 0.3% | 2026-Q2 |
| Rockefeller Capital Management L.P. trimmed | 302,393 | $25M | 0.3% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 296,899 | $24M | 0.3% | 2026-Q2 |
| Public Sector Pension Investment Board trimmed | 285,023 | $23M | 0.3% | 2026-Q2 |
| SEGALL BRYANT & HAMILL, LLC added | 271,735 | $22M | 0.3% | 2026-Q2 |
| UBS Group AG trimmed | 262,426 | $21M | 0.3% | 2026-Q2 |
| Boxer Capital Management, LLC | 200,000 | $16M | 0.2% | 2026-Q2 |
| RHUMBLINE ADVISERS trimmed | 192,706 | $16M | 0.2% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC added | 185,820 | $15M | 0.2% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC added | 171,874 | $14M | 0.2% | 2026-Q2 |
| Rock Springs Capital Management LP added | 162,298 | $13M | 0.2% | 2026-Q2 |
| Hudson Bay Capital Management LP added | 159,778 | $13M | 0.2% | 2026-Q2 |
| Schonfeld Strategic Advisors LLC trimmed | 147,425 | $12M | 0.2% | 2026-Q2 |
| Swiss National Bank trimmed | 141,465 | $12M | 0.1% | 2026-Q2 |
| Universal- Beteiligungs- und Servicegesellschaft mbH added | 135,633 | $11M | 0.1% | 2026-Q2 |
| HSBC HOLDINGS PLC trimmed | 131,389 | $11M | 0.1% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 126,011 | $10M | 0.1% | 2026-Q2 |
| SEI INVESTMENTS CO trimmed | 125,434 | $10M | 0.1% | 2026-Q2 |
| CITIGROUP INC added | 118,656 | $10M | 0.1% | 2026-Q2 |
| FIRST TRUST ADVISORS LP trimmed | 113,354 | $9M | 0.1% | 2026-Q2 |
| Longaeva Partners L.P. new | 111,803 | $9M | 0.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. trimmed | 105,937 | $7M | 0.1% | 2026-Q2 |
| SCHRODER INVESTMENT MANAGEMENT GROUP trimmed | 101,429 | $8M | 0.1% | 2026-Q2 |
| SECTOR GAMMA AS added | 100,000 | $8M | 0.1% | 2026-Q2 |
| WCM INVESTMENT MANAGEMENT, LLC trimmed | 93,799 | $8M | 0.1% | 2026-Q2 |
| PANAGORA ASSET MANAGEMENT INC trimmed | 88,956 | $7M | 0.1% | 2026-Q2 |
| Aquatic Capital Management LLC added | 83,470 | $7M | 0.1% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 83,071 | $7M | 0.1% | 2026-Q2 |
| XTX Topco Ltd added | 81,923 | $7M | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 81,733 | $7M | 0.1% | 2026-Q2 |
| Empowered Funds, LLC added | 81,271 | $7M | 0.1% | 2026-Q2 |
| MOORE CAPITAL MANAGEMENT, LP added | 75,588 | $6M | 0.1% | 2026-Q2 |
| PINNACLE ASSOCIATES LTD trimmed | 70,435 | $6M | 0.1% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC added | 69,660 | $6M | 0.1% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd added | 68,828 | $6M | 0.1% | 2026-Q2 |
| Capricorn Fund Managers Ltd new | 63,900 | $5M | 0.1% | 2026-Q2 |
| BARCLAYS PLC added | 58,370 | $5M | 0.1% | 2026-Q2 |
| INTECH INVESTMENT MANAGEMENT LLC added | 57,581 | $5M | 0.1% | 2026-Q2 |
| ExodusPoint Capital Management, LP added | 57,278 | $5M | 0.1% | 2026-Q2 |
| LOS ANGELES CAPITAL MANAGEMENT LLC trimmed | 55,926 | $5M | 0.1% | 2026-Q2 |
| Creative Planning added | 55,712 | $5M | 0.1% | 2026-Q2 |
| ORBIMED ADVISORS LLC | 49,100 | $4M | 0.1% | 2026-Q2 |
| MetLife Investment Management, LLC added | 48,212 | $4M | 0.0% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.