PBYI Institutional Ownership
Who owns Puma Biotechnology, Inc. and what the big funds did with it last quarter, from every SEC 13F filing. 161 funds reported holding PBYI at Jun 30, 2026, together owning 74.9% of the company.
- ▲81 buying vs 66 selling
- ▲Held by funds +1.6 pts
- ▲Funds holding +4
- ▼Superinvestors: 0 added, 3 cut
- ●Put/call not meaningful
What the filings show, not a forecast. Positions can be up to 45 days old and leave out short sales.
Funds holding and ownership
8 quartersQuarter over quarter
all 13F filers| Q2 2026 | This quarter | Q1 2026 | Change |
|---|---|---|---|
| Funds holding | 161 | 157 | +2.5% |
| In funds' top 10 | 1 | 1 | 0.0% |
| 13F shares | 38.7M | 37.9M | +2.1% |
| Held by funds | 74.9% | 73.3% | +1.6 pts |
| New positions | 21 | 23 | −8.7% |
| Increased | 60 | 61 | −1.6% |
| Reduced | 51 | 37 | +37.8% |
| Sold out | 15 | 18 | −16.7% |
| Calls (shares) | 0 | 0 | – |
| Puts (shares) | 0 | 0 | – |
| Put/call ratio | – | – | – |
Buyers vs sellers
adding or new vs cutting or sold outSuperinvestors in PBYI
All superinvestors →
Who owns PBYI
share of fund held shares- Index and passive funds33.1%
- Active managers and hedge funds58.9%
- Banks and brokers6.2%
- Pensions, insurers and other1.7%
The top 10 holders own 57.6% of all PBYI shares that funds reported. Groups are our own grouping of filers by name.
Put/call ratio
funds' options, market makers left outAbove 1 means funds hold more puts than calls, a sign of hedging or bets on a fall. Options are valued at the underlying shares.
Filed so far for Q3 2026
30 funds changed their position- SummerHaven Investment Management, LLCNew+114K sh
- OpenArc Corporate Advisory, LLCAdded+60K sh
- Creative PlanningAdded+40K sh
- State of WyomingSold out−40K sh
- Y-Intercept (Hong Kong) LtdSold out−26K sh
🔒 Free account: see all 20.
Top holders
Q2 2026| # | Fund | Of company | Shares | Value | Change |
|---|---|---|---|---|---|
| 1 | Acorn Capital Advisors, LLC | 8.00% | 4.1M | $33.5M | 0 |
| 2 | BlackRock, Inc. | 7.37% | 3.8M | $30.9M | +206K |
| 3 | American Century Companies Inc | 4.49% | 2.3M | $18.8M | +404K |
| 4 | Acadian Asset Management LLC | 3.98% | 2.1M | $16.6M | +12K |
| 5 | Renaissance Technologies LLC | 3.56% | 1.8M | $14.9M | −106K |
| 6 | Vanguard Capital Management LLC | 3.56% | 1.8M | $14.9M | +18K |
| 7 | Vanguard Portfolio Management LLC | 3.54% | 1.8M | $14.8M | +91K |
| 8 | Lsv Asset Management | 3.13% | 1.6M | $13.1M | +435K |
| 9 | Dimensional Fund Advisors LP | 2.94% | 1.5M | $12.3M | +82K |
| 10 | Geode Capital Management, LLC | 2.59% | 1.3M | $10.9M | +322K |
- Lsv Asset Management+435K sh+$3.5M
- American Century Companies Inc+404K sh+$3.3M
- Geode Capital Management, LLC+322K sh+$2.6M
- Invesco Ltd.+206K sh+$1.7M
- BlackRock, Inc.+206K sh+$1.7M
- Two Sigma Investments, LP+128K sh+$1M
- Wellington Management Group LLP+126K sh+$1M
- UBS Group AG+103K sh+$832K
- Millennium Management LLC−875K sh−$7.1M
- Connor, Clark & Lunn Investment Management Ltd.−140K sh−$1.1M
- Renaissance Technologies LLC−106K sh−$861K
- Morgan Stanley−94K sh−$763K
- Sei Investments Co−90K sh−$726K
- AQR Capital Management LLC−75K sh−$608K
- Franklin Resources Inc−43K sh−$352K
- Prudential Financial Inc−39K sh−$320K
PBYI institutional ownership FAQ
Who owns the most PBYI stock?
In Q2 2026 13F filings the largest holder of PBYI was Acorn Capital Advisors, LLC, followed by BlackRock, Inc. and American Century Companies Inc. Index fund managers are usually the biggest holders of large companies.
What percentage of PBYI is owned by institutions?
Funds that file 13F reports held 74.9% of PBYI's shares at Jun 30, 2026, compared with 73.3% a quarter earlier. That counts every manager with more than $100 million in US stocks.
Are hedge funds buying PBYI?
In Q2 2026, 81 funds bought PBYI (21 of them new positions) and 66 sold (15 sold out completely). Among well known investors, 0 added and 3 cut. Our fund sentiment for PBYI is bullish.
What is PBYI's institutional put/call ratio?
Too few option positions were reported for a meaningful ratio.
How current is this PBYI ownership data?
13F filings show holdings at the end of each quarter and are due within 45 days, so positions can be up to six weeks old when they appear. We add each new filing within minutes, and the "filed so far" list shows funds that have already reported the next quarter.
For informational and educational purposes only. Not investment advice, and not a recommendation to buy or sell any security. Fund sentiment summarises what 13F filings show and is not a forecast. Holdings come from SEC Form 13F filings as reported and show positions at the end of the quarter, up to 45 days before the filing. A 13F leaves out short positions, cash, bonds and most foreign holdings. See all hedge fund holdings.