PBYI

Puma Biotechnology Inc Cross-source read$9.12 0.55%
Health CareCUSIP 74587V107· EOD Sep 11, 2026

Among active 13F managers last quarter, 3 opened and 20 added, while 22 reduced; the largest holder to move was Renaissance Technologies LLC (−8.5%). Over the last 180 days, 8 insiders sold and none bought, a net -$1.1M in open-market trades.

Tracked 13F holders
148
68 in Q2 2026 filings
13F value (tracked)
$256.5M
Smart-money readMixed
Net sellingNet buying
Funds · active managers, latest 13F
23 adding · 22 trimming
Insiders · Form 4 open-market, 180d
0 buying · 8 selling · -$1.1M
US House · STOCK Act, 180d
0 buying · 0 selling

The legs disagree, or only one of them leans.

Price & smart-money activity

$9.12 0.55%5Y +28.5%
$1.11$3.42$5.72$8.02$10.33202120222023202420252026221510211920151422371312101615515151262088719920151419181818425162820133119272039276412481923
Hover for who · click for detailEnd-of-day closing prices52w $4.34 – $9.69

Who owns PBYI?

148 tracked 13F filers · ranked by shares held

148 tracked 13F filers disclose a position in PBYI as of the latest SEC 13F filings, a combined $256.5M in reported value. Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.

#FundSharesPosition valueLast moveAs ofHistory
1Acorn Capital Advisors, LLC4.1M
$33.5M
Held
Q2 2026
2BlackRock, Inc.3.8M
$30.9M
+5.7%
Added · +206K sh
Q2 2026
3Renaissance Technologies LLC1.9M
$12.4M
−8.5%
Reduced · −181K sh
Q1 2026
4American Century Companies Inc1.9M
$12.2M
+16%
Added · +266K sh
Q1 2026
5Vanguard Capital Management LLC1.8M
$14.9M
+1.0%
Added · +18K sh
Q2 2026
6Vanguard Portfolio Management LLC1.8M
$14.8M
+5.2%
Added · +91K sh
Q2 2026
7Millennium Management LLC1.5M
$9.4M
89×
Added · +1.5M sh
Q1 2026
8Dimensional Fund Advisors LP1.4M
$9.2M
+7.2%
Added · +97K sh
Q1 2026
9Geode Capital Management, LLC1.3M
$10.9M
+32%
Added · +322K sh
Q2 2026
10O'shaughnessy Asset Management, LLC1.1M
$9.1M
−1.3%
Reduced · −14K sh
Q2 2026
11State Street Corp952K
$7.7M
+3.8%
Added · +35K sh
Q2 2026
12Kennedy Capital Management LLC890K
$5.7M
+2.5%
Added · +21K sh
Q1 2026
13AQR Capital Management LLC800K
$5.1M
+20%
Added · +134K sh
Q1 2026
14Bridgeway Capital Management, LLC792K
$6.4M
+2.1%
Added · +16K sh
Q2 2026
15Ritholtz Wealth Management750K
$6.1M
−3.2%
Reduced · −25K sh
Q2 2026
16Goldman Sachs Group Inc670K
$4.3M
−16%
Reduced · −124K sh
Q1 2026
17Connor, Clark & Lunn Investment Management Ltd.643K
$5.2M
−18%
Reduced · −140K sh
Q2 2026
18Northern Trust Corp642K
$4.1M
+4.1%
Added · +26K sh
Q1 2026
19Arrowstreet Capital, Limited Partnership538K
$3.4M
−1.8%
Reduced · −10K sh
Q1 2026
20UBS Group AG534K
$3.4M
+320%
Added · +407K sh
Q1 2026
21Sei Investments Co508K
$3.2M
+18%
Added · +78K sh
Q1 2026
22Globeflex Capital L P383K
$3.1M
+9.5%
Added · +33K sh
Q2 2026
23Morgan Stanley360K
$2.3M
+10%
Added · +33K sh
Q1 2026
24D. E. Shaw & Co., Inc.351K
$2.2M
−7.2%
Reduced · −27K sh
Q1 2026
25Bank of New York Mellon Corp348K
$2.2M
−1.1%
Reduced · −4K sh
Q1 2026

Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.

Is PBYI being bought or sold by institutions?

Last quarter, 3 funds opened a new position in PBYI and 20 added to an existing one, while 22 reduced. Based on 13F filings from active, signal-eligible managers (passive index funds and other mechanical holders are excluded from this count).

Opened
3
funds took a first position
Added
20
added to an existing position
Reduced
22
reduced, still holding
Biggest moves · ranked by size of the change, positions above a floor

Funds that own PBYI also own

CompanyCo-held byTheir position there
Nvidia CorpNVDA73 funds$232.4B
Apple IncAAPL73 funds$166.9B
Microsoft CorpMSFT73 funds$146.6B
Broadcom IncAVGO73 funds$99.9B
Meta Platforms Inc-Class AMETA72 funds$60.5B
Tesla IncTSLA72 funds$40.2B
Lam Research CorpLRCX72 funds$28.4B
Costco Wholesale CorpCOST72 funds$20.8B
Walmart IncWMT72 funds$19.0B
Amazon.com IncAMZN71 funds$111.2B
Alphabet Inc-CL AGOOGL71 funds$104.6B
Eli Lilly & CoLLY71 funds$47.3B

Ranked by how many of PBYI's tracked holders also hold each name. The last column is those co-holders' combined reported position in that name, not in PBYI.

Insider activity (Form 4)

Full insider page →
Sells · 180d
$1.1M
8 insiders
Net · 180d
-$1.1M
8 open-market transactions
DateInsiderRoleActionSharesValue
Jul 6, 2026Hunt Douglas MSee RemarksSell (S)8K$70K
Jul 6, 2026Nougues Maximo FChief Financial OfficerSell (S)9K$78K
Jul 6, 2026Auerbach Alan HPresident and CEO, Director, 10% OwnerSell (S)44K$364K
Jun 12, 2026Dorval AllisonDirectorSell (S)12K$84K
Jun 12, 2026Wilson Troy EdwardDirectorSell (S)11K$78K
Jun 12, 2026Stuglik Brian MDirectorSell (S)8K$58K
Jun 12, 2026Senderowicz AdrianDirectorSell (S)27K$194K
Jun 12, 2026Moyes Jay MDirectorSell (S)22K$159K
Jan 7, 2026Nougues Maximo FChief Financial OfficerSell (S)6K$38K
Jan 7, 2026Hunt Douglas MSee RemarksSell (S)5K$29K
Jan 7, 2026Auerbach Alan HPresident and CEO, Director, 10% OwnerSell (S)18K$106K
Jan 6, 2026Nougues Maximo FChief Financial OfficerSell (S)5K$27K

Do institutions, insiders and Congress agree?

Mixed signals

Where institutional funds (13F), corporate insiders (Form 4) and US House members (STOCK Act) are buying or selling the same name in the same window. Green is buying, red is selling.

SEC EDGAR 13F + Form 4 + US House STOCK Act{ }get_ticker_confluence · API & MCP

Signals by source

Insiders and Congress: last 180 days. Funds: latest 13F, top 100 holders incl. passive

SourceBuyingSellingNet
13F funds
Top 100 holders by value, passive included; the hero counts active managers only
4239
Insiders
Form 4 open-market
08-$1.1M
US House
STOCK Act trades
00$0
Sector rotation
PBYI is in Health Care, which smart money is rotating OUT OF
$5.0B

Capital Rotation reports where institutional capital disclosed rotating, as of the latest public SEC 13F filings. It is data, not investment advice, a recommendation, or a prediction. Filings lag about 45 days and cover long US equity positions only. Past disclosed flows do not indicate future prices. Do your own research; consult a licensed advisor.

Institutional ownership over time

68 tracked filers in Q2 2026 filingsstill filing
071141Q3 2024Q1 2025Q3 2025Q1 2026Q2 2026
tracked filers holding their reported valueQ2 2026 filings so far: $89.2M
Each bar counts tracked filers with a position in that quarter's filings, so the newest bar excludes filers still on an earlier quarter. Arkolith's tracked universe has grown over this window; part of any long-run rise is coverage, not new buyers.

Recent filings

15 most recent

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Connected entities for PBYI

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Ask your agent what changed in PBYI

This stock page is the public Follow view. For one current, evidence-backed answer, use capital_change_brief through REST or MCP. It compares tracked 13F changes with qualifying Form 4 activity and cites the SEC evidence.

Copy-paste
curl -H "Authorization: Bearer YOUR_API_KEY" \
  "https://arkolith.com/api/v1/stocks/PBYI/capital-change-brief"
Ask your agent
Use Arkolith's capital_change_brief for PBYI.
Tell me what changed, whether insider activity
corroborates it, and cite the SEC evidence.

13F holdings + Form 4 insider transactions + end-of-day price history + the live filing stream, joined for PBYI. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.