Who owns PTCT (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-Q1 13F filings. 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
73 tracked funds added or opened PTCT while 117 trimmed or exited it between 2025-Q4 and 2026-Q1 — 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 2025-Q4 and 2026-Q1, across 349 tracked filers holding PTCT, 203 increased or opened the position and 167 reduced or closed it; over the same quarter, open-market insider Form 4 buying and selling roughly offset.
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 2025-Q4 and 2026-Q1 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 27
- VANGUARD PORTFOLIO MANAGEMENT LLC$327M
- VANGUARD CAPITAL MANAGEMENT LLC$250M
- Defilade Capital Management, L.P.$41M
- VANGUARD FIDUCIARY TRUST CO$38M
- Qube Research & Technologies Ltd$35M
- LOOMIS SAYLES & CO L P$34M
Full exits 34
- VANGUARD GROUP INC$660M
- Avoro Capital Advisors LLC$104M
- Point72 Asset Management, L.P.$86M
- MPM BIOIMPACT LLC$33M
- Pacer Advisors, Inc.$18M
- ADAGE CAPITAL PARTNERS GP, L.L.C.$11M
Largest adds
- JANUS HENDERSON GROUP PLC$121M
- Hood River Capital Management LLC$37M
- Invesco Ltd.$21M
- JUPITER ASSET MANAGEMENT LTD$21M
- BANK OF AMERICA CORP /DE/$20M
- UBS Group AG$20M
Largest trims
- BlackRock, Inc.$190M
- TORONTO DOMINION BANK$108M
- ARMISTICE CAPITAL, LLC$71M
- CITADEL ADVISORS LLC$61M
- RTW INVESTMENTS, LP$61M
- Jefferies Financial Group Inc.$34M
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. trimmed | 11,466,200 | $781M | 10.9% | 2026-Q1 |
| RTW INVESTMENTS, LP | 7,746,415 | $528M | 7.4% | 2026-Q1 |
| JANUS HENDERSON GROUP PLC added | 7,193,433 | $490M | 6.8% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 4,804,594 | $327M | 4.6% | 2026-Q1 |
| STATE STREET CORP added | 4,346,519 | $296M | 4.1% | 2026-Q1 |
| WELLINGTON MANAGEMENT GROUP LLP added | 3,931,371 | $268M | 3.7% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 3,676,256 | $250M | 3.5% | 2026-Q1 |
| TORONTO DOMINION BANK trimmed | 3,025,963 | $206M | 2.9% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 2,209,954 | $151M | 2.1% | 2026-Q1 |
| ARMISTICE CAPITAL, LLC trimmed | 2,074,449 | $141M | 2.0% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 1,886,841 | $129M | 1.8% | 2026-Q1 |
| Hood River Capital Management LLC added | 1,664,559 | $113M | 1.6% | 2026-Q1 |
| D. E. Shaw & Co., Inc. trimmed | 1,640,381 | $112M | 1.6% | 2026-Q1 |
| TANG CAPITAL MANAGEMENT LLC | 1,500,000 | $102M | 1.4% | 2026-Q1 |
| FMR LLC trimmed | 1,472,049 | $100M | 1.4% | 2026-Q1 |
| UBS Group AG added | 1,364,768 | $93M | 1.3% | 2026-Q1 |
| Jefferies Financial Group Inc. trimmed | 1,354,459 | $92M | 1.3% | 2026-Q1 |
| Pictet Asset Management Holding SA added | 1,183,720 | $80M | 1.1% | 2026-Q1 |
| FRANKLIN RESOURCES INC trimmed | 1,121,388 | $76M | 1.1% | 2026-Q1 |
| Driehaus Capital Management LLC trimmed | 1,015,772 | $69M | 1.0% | 2026-Q1 |
| Palo Alto Investors LP added | 921,607 | $63M | 0.9% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS added | 920,476 | $63M | 0.9% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP added | 890,715 | $61M | 0.8% | 2026-Q1 |
| SG Americas Securities, LLC trimmed | 879,701 | $60M | 0.8% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC trimmed | 827,631 | $56M | 0.8% | 2026-Q1 |
| NORTHERN TRUST CORP added | 806,276 | $55M | 0.8% | 2026-Q1 |
| Invesco Ltd. added | 794,067 | $54M | 0.8% | 2026-Q1 |
| Woodline Partners LP added | 744,988 | $51M | 0.7% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 731,642 | $50M | 0.7% | 2026-Q1 |
| JUPITER ASSET MANAGEMENT LTD added | 711,457 | $48M | 0.7% | 2026-Q1 |
| MORGAN STANLEY trimmed | 674,134 | $46M | 0.6% | 2026-Q1 |
| Nuveen, LLC trimmed | 667,019 | $45M | 0.6% | 2026-Q1 |
| Boston Partners added | 647,482 | $44M | 0.6% | 2026-Q1 |
| LORD, ABBETT & CO. LLC trimmed | 617,121 | $42M | 0.6% | 2026-Q1 |
| Defilade Capital Management, L.P. new | 376,165 | $41M | 0.6% | 2026-Q1 |
| Ensign Peak Advisors, Inc added | 582,318 | $40M | 0.6% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 553,658 | $38M | 0.5% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 533,300 | $36M | 0.5% | 2026-Q1 |
| Bank of New York Mellon Corp added | 522,763 | $36M | 0.5% | 2026-Q1 |
| PRINCIPAL FINANCIAL GROUP INC added | 515,001 | $35M | 0.5% | 2026-Q1 |
| Qube Research & Technologies Ltd added | 513,823 | $35M | 0.5% | 2026-Q1 |
| LOOMIS SAYLES & CO L P trimmed | 493,603 | $34M | 0.5% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 475,148 | $32M | 0.5% | 2026-Q1 |
| MARSHALL WACE, LLP added | 460,638 | $31M | 0.4% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. added | 460,564 | $31M | 0.4% | 2026-Q1 |
| Parkman Healthcare Partners LLC added | 431,364 | $29M | 0.4% | 2026-Q1 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE trimmed | 425,240 | $29M | 0.4% | 2026-Q1 |
| CITADEL ADVISORS LLC trimmed | 385,199 | $26M | 0.4% | 2026-Q1 |
| Rockefeller Capital Management L.P. trimmed | 384,672 | $26M | 0.4% | 2026-Q1 |
| PANAGORA ASSET MANAGEMENT INC trimmed | 351,370 | $24M | 0.3% | 2026-Q1 |
| MACKENZIE FINANCIAL CORP added | 345,683 | $24M | 0.3% | 2026-Q1 |
| Legal & General Group Plc trimmed | 343,380 | $23M | 0.3% | 2026-Q1 |
| VOYA INVESTMENT MANAGEMENT LLC added | 342,637 | $23M | 0.3% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC trimmed | 339,609 | $23M | 0.3% | 2026-Q1 |
| Russell Investments Group, Ltd. added | 335,439 | $23M | 0.3% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 346,017 | $23M | 0.3% | 2026-Q1 |
| Public Sector Pension Investment Board added | 331,852 | $23M | 0.3% | 2026-Q1 |
| Schonfeld Strategic Advisors LLC added | 318,405 | $22M | 0.3% | 2026-Q1 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. trimmed | 311,810 | $21M | 0.3% | 2026-Q1 |
| DEUTSCHE BANK AG\ added | 238,754 | $16M | 0.2% | 2026-Q1 |
| HSBC HOLDINGS PLC added | 227,059 | $15M | 0.2% | 2026-Q1 |
| FEDERATED HERMES, INC. added | 225,916 | $15M | 0.2% | 2026-Q1 |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main trimmed | 213,363 | $15M | 0.2% | 2026-Q1 |
| RHUMBLINE ADVISERS added | 212,462 | $14M | 0.2% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 207,938 | $14M | 0.2% | 2026-Q1 |
| Boxer Capital Management, LLC | 200,000 | $14M | 0.2% | 2026-Q1 |
| SEGALL BRYANT & HAMILL, LLC added | 198,989 | $13M | 0.2% | 2026-Q1 |
| Blue Sparrow, LLC /DE new | 190,600 | $13M | 0.2% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. added | 152,176 | $12M | 0.2% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC added | 166,659 | $11M | 0.2% | 2026-Q1 |
| PRUDENTIAL FINANCIAL INC trimmed | 164,570 | $11M | 0.2% | 2026-Q1 |
| Rock Springs Capital Management LP added | 161,798 | $11M | 0.2% | 2026-Q1 |
| Swiss National Bank added | 142,865 | $10M | 0.1% | 2026-Q1 |
| FIRST TRUST ADVISORS LP trimmed | 136,003 | $9M | 0.1% | 2026-Q1 |
| SEI INVESTMENTS CO added | 130,204 | $9M | 0.1% | 2026-Q1 |
| SCHRODER INVESTMENT MANAGEMENT GROUP added | 134,968 | $9M | 0.1% | 2026-Q1 |
| Universal- Beteiligungs- und Servicegesellschaft mbH trimmed | 129,682 | $9M | 0.1% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 126,963 | $9M | 0.1% | 2026-Q1 |
| NEUBERGER BERMAN GROUP LLC added | 121,549 | $8M | 0.1% | 2026-Q1 |
| CAPITAL FUND MANAGEMENT S.A. added | 121,286 | $8M | 0.1% | 2026-Q1 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP trimmed | 111,632 | $8M | 0.1% | 2026-Q1 |
| ROYCE & ASSOCIATES LP added | 92,828 | $6M | 0.1% | 2026-Q1 |
| CASTLEARK MANAGEMENT LLC trimmed | 91,880 | $6M | 0.1% | 2026-Q1 |
| WCM INVESTMENT MANAGEMENT, LLC trimmed | 94,687 | $6M | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC added | 8,687,005 | $660M | 9.2% | 2025-Q4 stale |
| Point72 Asset Management, L.P. trimmed | 1,128,551 | $86M | 1.2% | 2025-Q4 stale |
| Camber Capital Management LP trimmed | 1,500,000 | $76M | 1.1% | 2025-Q1 stale |
| Avoro Capital Advisors LLC added | 685,000 | $52M | 0.7% | 2025-Q4 stale |
| MPM BIOIMPACT LLC trimmed | 430,013 | $33M | 0.5% | 2025-Q4 stale |
| Pacer Advisors, Inc. trimmed | 235,653 | $18M | 0.2% | 2025-Q4 stale |
| Trexquant Investment LP added | 272,774 | $13M | 0.2% | 2025-Q2 stale |
| Sofinnova Investments, Inc. trimmed | 186,932 | $11M | 0.2% | 2025-Q3 stale |
| ADAGE CAPITAL PARTNERS GP, L.L.C. trimmed | 141,000 | $11M | 0.1% | 2025-Q4 stale |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC trimmed | 159,596 | $10M | 0.1% | 2025-Q3 stale |
| Ikarian Capital, LLC trimmed | 118,657 | $9M | 0.1% | 2025-Q4 stale |
| Candriam S.C.A. trimmed | 146,265 | $9M | 0.1% | 2025-Q3 stale |
| Squarepoint Ops LLC added | 181,978 | $9M | 0.1% | 2025-Q2 stale |
| T. Rowe Price Investment Management, Inc. trimmed | 174,088 | $9M | 0.1% | 2025-Q1 stale |
| TWINBEECH CAPITAL LP added | 127,193 | $6M | 0.1% | 2025-Q1 stale |
| SummitTX Capital, L.P. added | 102,734 | $6M | 0.1% | 2025-Q3 stale |
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.