Who owns Puma Biotechnology (PBYI)
Which tracked institutional funds hold PBYI, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See PBYI 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
The tracked-fund tape on PBYI is one-sided between 2026-Q1 and 2026-Q2: 37 added or opened and 3 trimmed or exited — on balance accumulating.
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
PBYI’s largest tracked holder by dollar value, ACORN CAPITAL ADVISORS, LLC, sizes it at 9.1% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 9.1pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in PBYI 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 156 tracked filers holding PBYI, 81 increased or opened the position and 72 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 PBYI 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 2
- WELLINGTON MANAGEMENT GROUP LLP$1M
- Trexquant Investment LP$586K
Full exits 2
- ACADIAN ASSET MANAGEMENT LLC$13M
- LSV ASSET MANAGEMENT$8M
Largest adds
- BlackRock, Inc.$8M
- ACORN CAPITAL ADVISORS, LLC$7M
- AMERICAN CENTURY COMPANIES INC$7M
- GEODE CAPITAL MANAGEMENT, LLC$4M
- VANGUARD PORTFOLIO MANAGEMENT LLC$4M
- VANGUARD CAPITAL MANAGEMENT LLC$3M
Largest trims
- MILLENNIUM MANAGEMENT LLC$5M
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 |
|---|---|---|---|---|
| ACORN CAPITAL ADVISORS, LLC | 4,131,299 | $34M | 11.8% | 2026-Q2 |
| BlackRock, Inc. added | 3,804,736 | $31M | 10.9% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 2,319,996 | $19M | 6.7% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 1,836,213 | $15M | 5.3% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 1,835,643 | $15M | 5.3% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 1,825,599 | $15M | 5.2% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 1,518,014 | $12M | 4.4% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 1,339,405 | $11M | 3.8% | 2026-Q2 |
| O'SHAUGHNESSY ASSET MANAGEMENT, LLC trimmed | 1,123,783 | $9M | 3.2% | 2026-Q2 |
| STATE STREET CORP added | 952,165 | $8M | 2.7% | 2026-Q2 |
| KENNEDY CAPITAL MANAGEMENT LLC trimmed | 873,253 | $7M | 2.5% | 2026-Q2 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC added | 791,616 | $6M | 2.3% | 2026-Q2 |
| RITHOLTZ WEALTH MANAGEMENT trimmed | 749,798 | $6M | 2.1% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC trimmed | 725,192 | $6M | 2.1% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 669,156 | $5M | 1.9% | 2026-Q2 |
| NORTHERN TRUST CORP added | 652,386 | $5M | 1.9% | 2026-Q2 |
| Connor, Clark & Lunn Investment Management Ltd. trimmed | 642,946 | $5M | 1.8% | 2026-Q2 |
| UBS Group AG added | 636,761 | $5M | 1.8% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC trimmed | 602,240 | $5M | 1.7% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP trimmed | 532,450 | $4M | 1.5% | 2026-Q2 |
| SEI INVESTMENTS CO trimmed | 418,669 | $3M | 1.2% | 2026-Q2 |
| GLOBEFLEX CAPITAL L P added | 382,807 | $3M | 1.1% | 2026-Q2 |
| Bank of New York Mellon Corp added | 360,734 | $3M | 1.0% | 2026-Q2 |
| D. E. Shaw & Co., Inc. trimmed | 316,343 | $3M | 0.9% | 2026-Q2 |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM added | 309,106 | $3M | 0.9% | 2026-Q2 |
| Invesco Ltd. added | 301,002 | $2M | 0.9% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 272,234 | $2M | 0.8% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 269,070 | $2M | 0.8% | 2026-Q2 |
| MORGAN STANLEY trimmed | 265,670 | $2M | 0.8% | 2026-Q2 |
| FEDERATED HERMES, INC. added | 250,766 | $2M | 0.7% | 2026-Q2 |
| Empowered Funds, LLC added | 220,316 | $2M | 0.6% | 2026-Q2 |
| PANAGORA ASSET MANAGEMENT INC added | 217,545 | $2M | 0.6% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC trimmed | 213,599 | $2M | 0.6% | 2026-Q2 |
| FMR LLC added | 211,444 | $2M | 0.6% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 211,339 | $2M | 0.6% | 2026-Q2 |
| STATE OF WISCONSIN INVESTMENT BOARD trimmed | 188,232 | $2M | 0.5% | 2026-Q2 |
| FRANKLIN RESOURCES INC trimmed | 172,010 | $1M | 0.5% | 2026-Q2 |
| Prospera Financial Services Inc trimmed | 158,762 | $1M | 0.5% | 2026-Q2 |
| Haven Private, LLC trimmed | 148,448 | $1M | 0.4% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP added | 140,587 | $1M | 0.4% | 2026-Q2 |
| FIRST TRUST ADVISORS LP added | 130,206 | $1M | 0.4% | 2026-Q2 |
| Round Rock Advisors LLC | 128,912 | $1M | 0.4% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 128,243 | $1M | 0.4% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP trimmed | 126,091 | $1M | 0.4% | 2026-Q2 |
| STRS OHIO trimmed | 84,600 | $686K | 0.2% | 2026-Q2 |
| Nuveen, LLC added | 82,298 | $667K | 0.2% | 2026-Q2 |
| EVERGREEN CAPITAL MANAGEMENT LLC trimmed | 73,731 | $598K | 0.2% | 2026-Q2 |
| CANADA PENSION PLAN INVESTMENT BOARD added | 73,500 | $596K | 0.2% | 2026-Q2 |
| Trexquant Investment LP new | 72,223 | $586K | 0.2% | 2026-Q2 |
| Vise Technologies, Inc. added | 72,030 | $584K | 0.2% | 2026-Q2 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | 61,255 | $497K | 0.2% | 2026-Q2 |
| OpenArc Corporate Advisory, LLC trimmed | 59,491 | $482K | 0.2% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 57,510 | $466K | 0.2% | 2026-Q2 |
| D'Orazio & Associates, Inc. trimmed | 48,680 | $395K | 0.1% | 2026-Q2 |
| Vanguard Global Advisers, LLC added | 46,267 | $375K | 0.1% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 43,192 | $350K | 0.1% | 2026-Q2 |
| Man Group plc trimmed | 41,506 | $337K | 0.1% | 2026-Q2 |
| WINTON GROUP Ltd trimmed | 40,509 | $329K | 0.1% | 2026-Q2 |
| XTX Topco Ltd added | 40,296 | $327K | 0.1% | 2026-Q2 |
| State of Wyoming trimmed | 39,833 | $323K | 0.1% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 37,606 | $305K | 0.1% | 2026-Q2 |
| EntryPoint Capital, LLC trimmed | 37,386 | $303K | 0.1% | 2026-Q2 |
| Baron Wealth Management LLC trimmed | 36,372 | $295K | 0.1% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 36,343 | $295K | 0.1% | 2026-Q2 |
| Creative Planning added | 35,737 | $290K | 0.1% | 2026-Q2 |
| LPL Financial LLC trimmed | 34,537 | $280K | 0.1% | 2026-Q2 |
| Universal- Beteiligungs- und Servicegesellschaft mbH trimmed | 34,485 | $280K | 0.1% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 31,747 | $257K | 0.1% | 2026-Q2 |
| Kathmere Capital Management, LLC added | 31,172 | $253K | 0.1% | 2026-Q2 |
| ENVESTNET ASSET MANAGEMENT INC added | 29,190 | $237K | 0.1% | 2026-Q2 |
| Y-Intercept (Hong Kong) Ltd new | 26,222 | $213K | 0.1% | 2026-Q2 |
| MARTINGALE ASSET MANAGEMENT L P new | 25,364 | $206K | 0.1% | 2026-Q2 |
| Metis Global Partners, LLC | 25,264 | $205K | 0.1% | 2026-Q2 |
| MetLife Investment Management, LLC added | 24,873 | $202K | 0.1% | 2026-Q2 |
| C2C Wealth Management, LLC | 23,620 | $192K | 0.1% | 2026-Q2 |
| CITIGROUP INC added | 21,666 | $176K | 0.1% | 2026-Q2 |
| PRELUDE CAPITAL MANAGEMENT, LLC added | 21,548 | $175K | 0.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 21,360 | $136K | 0.0% | 2026-Q2 |
| One Wealth Advisors, LLC | 21,079 | $171K | 0.1% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. trimmed | 20,383 | $165K | 0.1% | 2026-Q2 |
| BAILARD, INC. | 18,100 | $147K | 0.1% | 2026-Q2 |
| Allspring Global Investments Holdings, LLC added | 17,945 | $143K | 0.1% | 2026-Q2 |
| Spark Investment Management LLC new | 17,000 | $138K | 0.0% | 2026-Q2 |
| Police & Firemen's Retirement System of New Jersey | 15,719 | $127K | 0.0% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 15,476 | $126K | 0.0% | 2026-Q2 |
| Lido Advisors, LLC new | 15,045 | $122K | 0.0% | 2026-Q2 |
| Mariner, LLC added | 14,869 | $121K | 0.0% | 2026-Q2 |
| Caprock Group, LLC trimmed | 13,862 | $112K | 0.0% | 2026-Q2 |
| PERKINS CAPITAL MANAGEMENT INC added | 13,400 | $109K | 0.0% | 2026-Q2 |
| TOCQUEVILLE ASSET MANAGEMENT L.P. added | 13,312 | $108K | 0.0% | 2026-Q2 |
| WEALTH ENHANCEMENT ADVISORY SERVICES, LLC added | 13,203 | $106K | 0.0% | 2026-Q2 |
| OSAIC HOLDINGS, INC. added | 12,169 | $99K | 0.0% | 2026-Q2 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE added | 12,056 | $98K | 0.0% | 2026-Q2 |
| R Squared Ltd added | 11,991 | $97K | 0.0% | 2026-Q2 |
| Abel Hall, LLC added | 11,520 | $93K | 0.0% | 2026-Q2 |
| BARCLAYS PLC trimmed | 11,202 | $91K | 0.0% | 2026-Q2 |
| IEQ CAPITAL, LLC trimmed | 10,671 | $87K | 0.0% | 2026-Q2 |
| Cerity Partners LLC trimmed | 10,512 | $85K | 0.0% | 2026-Q2 |
| Williams & Novak, LLC trimmed | 10,489 | $85K | 0.0% | 2026-Q2 |
| Vanguard Personalized Indexing Management, LLC new | 10,408 | $84K | 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.