$ZBIO

$27.24 +$0.37 (1.38%) Close

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

Ownership

13F as of Q2 2026 · 65.2M shares outstanding

Who owns ZBIO?

By type of holder

Institutions 94.0% Insiders 6.0% Everyone else 0.0%

Concentration Top 10 holders own 75.4%

FMR LLC 14.6% · InnoCare Pharma Inc. 10.7%

Institutional ownership

94.0%

+5.3 pts vs last qtr

Institutional holders

144

+4 vs last qtr

Net shares bought

+3.5M

by institutions in Q2 2026

New / sold out

28 / 24

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Price T Rowe Associates Inc /MD/ +869.7K
Bank Of America Corp /de/ +842.8K

Biggest sellers in Q2 2026

Silverarc Capital Management, LLC −626.1K
Great Point Partners LLC SOLD OUT −524.1K

Who is planning to sell?

Notices of proposed sale, last 12 months

$31.9M

1 notice from 1 person

Shares covered

1.0M

1.53% of the company

Arranged in advance

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Zebra Aggregator, LP Affiliate $31.9M

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, FY2023–FY2025

+2821.3%

+440.49% a year

Each share's claim on the business

−96.6%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $40.7M

over 3 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+ years0% 3–5 years0% 1–3 years76% Under 1 year24%

Quarterly turnover

9.1%

of institutional shares changed hands

Top 10 managers, median time held

1.8 years

Super Investors

Investment managers reporting ZBIO on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
F FMR LLC	9.5M	14.59%	+424.7K (+4.7%)	2024	0.0%
Shares held by quarter Peak holding9.5M (Q2'26) Change over 8 quarters+7.5M Share of the company14.590% FMR LLC's full portfolio →
SO SR One Capital Management, LP	5.0M	7.73%	Unchanged	2024	12.3%
Shares held by quarter Peak holding5.0M (Q4'25) Change over 8 quarters+126.3K Share of the company7.730% SR One Capital Management, LP's full portfolio →

FMR LLC

9.5M

% of company

14.59%

Change vs last qtr

+424.7K (+4.7%)

Held since

2024

SR One Capital Management, LP

5.0M

% of company

7.73%

Change vs last qtr

Unchanged

Held since

2024

28 more super investors behind a free account

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

Institutional Funds

Mutual funds and ETFs reporting ZBIO on Form N-PORT; together they hold 36.0% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VH Vanguard Health Care Fund Vanguard Specialized Funds	$92.3M	2.9M	4.51%	0.24%	July 31, 2026
SW SMALLCAP World Fund Inc SMALLCAP World Fund Inc	$61.8M	2.4M	3.73%	0.07%	June 30, 2026

Vanguard Health Care Fund

Vanguard Specialized Funds

Position value

$92.3M

% of company

4.51%

% of the fund

0.24%

As of

July 31, 2026

SMALLCAP World Fund Inc

Position value

$61.8M

% of company

3.73%

% of the fund

0.07%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Zenas Biopharma 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
IP InnoCare Pharma Inc. Insider	7.0M	10.74%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company10.740% InnoCare Pharma Inc.'s insider activity →
SG Simeon George 5%+ holder 13D · 7.7%	5.0M	7.73%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company7.730% Disclosed stake13D · 7.7% View the 13D/G filing →

InnoCare Pharma Inc.

Insider

7.0M

% of company

10.74%

Change vs last qtr

—

Held since

—

Simeon George

5%+ holder13D · 7.7%

5.0M

% of company

7.73%

Change vs last qtr

—

Held since

—

20 more holders behind a free account

See every insider and 5%+ holder of Zenas Biopharma Inc.

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