$PBYI

$10.92 +$0.07 (0.65%) Close

$PBYI Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 51.6M shares outstanding

Who owns PBYI?

By type of holder

Institutions 74.9% Insiders 16.1% Everyone else 9.0%

Concentration Top 10 holders own 57.3%

Alan H. Auerbach 16.8% · Acorn Capital Advisors, LLC 8.0%

Institutional ownership

74.9%

+1.5 pts vs last qtr

Institutional holders

159

+2 vs last qtr

Net shares bought

+793.8K

by institutions in Q2 2026

New / sold out

21 / 19

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

LSV Asset Management +435.1K
American Century Companies Inc +403.7K

Biggest sellers in Q2 2026

Millennium Management LLC −875.3K
Connor, Clark & Lunn Investment Management Ltd. −139.9K

Who is planning to sell?

Notices of proposed sale, last 12 months

$2.12M

17 notices from 10 people

Shares covered

283.4K

0.55% of the company

Arranged in advance

56%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Auerbach Alan H Officer $569K
Cesano Alessandra Director 10b5-1 $566K

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2020–FY2025

+28.0%

+5.06% a year

Each share's claim on the business

−21.9%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $106M

over 6 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years48% 3–5 years14% 1–3 years33% Under 1 year5%

Quarterly turnover

6.4%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting PBYI on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
AC Acorn Capital Advisors, LLC	4.1M	8.00%	Unchanged	2024	9.1%
Shares held by quarter Peak holding4.1M (Q2'25) Change over 8 quarters+4.1M Share of the company8.000% Acorn Capital Advisors, LLC's full portfolio →
B BlackRock, Inc.	3.8M	7.37%	+205.8K (+5.7%)	≤2021	0.0%
Shares held by quarter Peak holding3.8M (Q1'25) Change over 8 quarters−22.5K Share of the company7.370% BlackRock, Inc.'s full portfolio →

Acorn Capital Advisors, LLC

4.1M

% of company

8.00%

Change vs last qtr

Unchanged

Held since

2024

BlackRock, Inc.

3.8M

% of company

7.37%

Change vs last qtr

+205.8K (+5.7%)

Held since

≤2021

28 more super investors behind a free account

See every manager holding Puma Biotechnology Inc, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting PBYI on Form N-PORT; together they hold 27.5% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
AU Avantis U.S. Small Cap Value ETF American Century ETF Trust	$13.8M	1.9M	3.73%	0.05%	May 31, 2026
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$10.9M	1.3M	2.60%	0.00%	June 30, 2026

Avantis U.S. Small Cap Value ETF

American Century ETF Trust

Position value

$13.8M

% of company

3.73%

% of the fund

0.05%

As of

May 31, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$10.9M

% of company

2.60%

% of the fund

0.00%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Puma Biotechnology Inc and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
AH Alan H. Auerbach 5%+ holder 13D · 16.0%	8.6M	16.76%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company16.760% Disclosed stake13D · 16.0% View the 13D/G filing →
NM Nougues Maximo F Insider	230.6K	0.45%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.450% Nougues Maximo F's insider activity →

Alan H. Auerbach

5%+ holder13D · 16.0%

8.6M

% of company

16.76%

Change vs last qtr

—

Held since

—

Nougues Maximo F

Insider

230.6K

% of company

0.45%

Change vs last qtr

—

Held since

—

9 more holders behind a free account

See every insider and 5%+ holder of Puma Biotechnology Inc.

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