Who owns PTOR (PTOR)
Which tracked institutional funds hold PTOR, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See PTOR 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.
Conviction spread
PTOR’s largest tracked holder by dollar value, Decagon Asset Management LLP, sizes it at 2.5% of its own reported 13F book, while the median holder sizes it at 0.1% of theirs — a 2.4pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in PTOR 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
Only one quarter (2026-Q1) of 13F history is available — a quarter-over-quarter accumulation delta needs two.
We do not publish a positioning read for a window we cannot measure honestly. A starting question, not a verdict.
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.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| Decagon Asset Management LLP new | 77,677 | $26M | 12.6% | 2026-Q1 |
| STEADFAST CAPITAL MANAGEMENT LP new | 2,000,000 | $20M | 9.7% | 2026-Q1 |
| LMR Partners LLP new | 1,550,000 | $15M | 7.5% | 2026-Q1 |
| Magnetar Financial LLC new | 1,500,000 | $15M | 7.2% | 2026-Q1 |
| Alberta Investment Management Corp new | 1,400,000 | $14M | 6.8% | 2026-Q1 |
| ARISTEIA CAPITAL, L.L.C. new | 1,350,000 | $13M | 6.6% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC new | 1,320,000 | $13M | 6.4% | 2026-Q1 |
| TENOR CAPITAL MANAGEMENT Co., L.P. new | 1,100,000 | $11M | 5.3% | 2026-Q1 |
| AQR Arbitrage LLC new | 948,979 | $9M | 4.6% | 2026-Q1 |
| Shaolin Capital Management LLC new | 850,000 | $8M | 4.1% | 2026-Q1 |
| Hudson Bay Capital Management LP new | 750,000 | $7M | 3.6% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS new | 701,021 | $7M | 3.4% | 2026-Q1 |
| PICTON MAHONEY ASSET MANAGEMENT new | 500,000 | $5M | 2.4% | 2026-Q1 |
| OMERS ADMINISTRATION Corp new | 440,000 | $4M | 2.1% | 2026-Q1 |
| Lineage Point Capital LP new | 406,254 | $4M | 2.0% | 2026-Q1 |
| WHITEBOX ADVISORS LLC new | 400,000 | $4M | 1.9% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP new | 398,750 | $4M | 1.9% | 2026-Q1 |
| Clear Street Group Inc. new | 504,078 | $3M | 1.7% | 2026-Q1 |
| Linden Advisors LP new | 250,000 | $2M | 1.2% | 2026-Q1 |
| Mint Tower Capital Management B.V. new | 250,000 | $2M | 1.2% | 2026-Q1 |
| RIVERNORTH CAPITAL MANAGEMENT, LLC new | 200,000 | $2M | 1.0% | 2026-Q1 |
| Context Capital Management, LLC new | 200,000 | $2M | 1.0% | 2026-Q1 |
| ExodusPoint Capital Management, LP new | 174,161 | $2M | 0.8% | 2026-Q1 |
| Radcliffe Capital Management, L.P. new | 167,362 | $2M | 0.8% | 2026-Q1 |
| Westchester Capital Management, LLC new | 150,000 | $1M | 0.7% | 2026-Q1 |
| Parallax Volatility Advisers, L.P. new | 128,545 | $1M | 0.6% | 2026-Q1 |
| DLD Asset Management, LP new | 109,500 | $1M | 0.5% | 2026-Q1 |
| Virtu Financial LLC new | 97,565 | $957K | 0.5% | 2026-Q1 |
| TORONTO DOMINION BANK new | 85,320 | $836K | 0.4% | 2026-Q1 |
| HEIGHTS CAPITAL MANAGEMENT, INC new | 60,000 | $593K | 0.3% | 2026-Q1 |
| Periscope Capital Inc. new | 50,000 | $495K | 0.2% | 2026-Q1 |
| ABC ARBITRAGE SA new | 40,000 | $396K | 0.2% | 2026-Q1 |
| HRT FINANCIAL LP new | 31,600 | $312K | 0.2% | 2026-Q1 |
| Tuttle Capital Management, LLC new | 25,000 | $247K | 0.1% | 2026-Q1 |
| GLAZER CAPITAL, LLC new | 340,203 | $105K | 0.1% | 2026-Q1 |
| BERKLEY W R CORP new | 265,230 | $85K | 0.0% | 2026-Q1 |
| Governors Lane LP new | 233,333 | $75K | 0.0% | 2026-Q1 |
| Polar Asset Management Partners Inc. new | 166,666 | $55K | 0.0% | 2026-Q1 |
| D. E. Shaw & Co., Inc. new | 166,666 | $50K | 0.0% | 2026-Q1 |
| CSS LLC/IL new | 132,351 | $44K | 0.0% | 2026-Q1 |
| SONA ASSET MANAGEMENT (US) LLC new | 116,667 | $38K | 0.0% | 2026-Q1 |
| Warberg Asset Management LLC new | 21,732 | $7K | 0.0% | 2026-Q1 |
| MORGAN STANLEY new | 10 | $98 | 0.0% | 2026-Q1 |
| Kepos Capital LP new | 1 | — | 0.0% | 2026-Q1 |
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.