$MBIO

$0.36 +$0.00 (0.17%) Close

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

Ownership

13F as of Q2 2026 · 6.7M shares outstanding

Who owns MBIO?

By type of holder

Institutions 7.8% Insiders 0.1% Everyone else 92.1%

Concentration Top 10 holders own 15.5%

Fortress Biotech, Inc. 8.0% · Kestra Advisory Services, LLC 2.9%

Institutional ownership

7.8%

+0.3 pts vs last qtr

Institutional holders

0 vs last qtr

Net shares bought

+17.3K

by institutions in Q2 2026

New / sold out

4 / 4

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Kestra Advisory Services, LLC +20.9K
XTX Topco Ltd NEW +14.6K

Biggest sellers in Q2 2026

Geode Capital Management, LLC −50.6K
Two Sigma Investments, LP SOLD OUT −16.8K

Who is planning to sell?

No insider has filed a notice of proposed sale (Form 144) for Mustang Bio Inc in the last 12 months.

Is your stake being diluted?

Diluted share count, FY2024–FY2025

+705.0%

+705.02% a year

Each share's claim on the business

−87.6%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $579K

over 2 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 years25% 1–3 years0% Under 1 year75%

Quarterly turnover

15.0%

of institutional shares changed hands

Top 10 managers, median time held

3 quarters

Super Investors

Investment managers reporting MBIO on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
KA Kestra Advisory Services, LLC	197.0K	2.93%	+20.9K (+11.9%)	Q3 '25	0.0%
Shares held by quarter Peak holding197.0K (Q2'26) Change over 8 quarters+197.0K Share of the company2.930% Kestra Advisory Services, LLC's full portfolio →
GC Geode Capital Management, LLC	42.2K	0.63%	−50.6K (−54.5%)	2023	0.0%
Shares held by quarter Peak holding284.4K (Q4'24) Change over 8 quarters−203.2K Share of the company0.630% Geode Capital Management, LLC's full portfolio →

Kestra Advisory Services, LLC

197.0K

% of company

2.93%

Change vs last qtr

+20.9K (+11.9%)

Held since

Q3 '25

Geode Capital Management, LLC

42.2K

% of company

0.63%

Change vs last qtr

−50.6K (−54.5%)

Held since

2023

24 more super investors behind a free account

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

Institutional Funds

Mutual funds and ETFs reporting MBIO on Form N-PORT; together they hold 1.0% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
FE Fidelity Extended Market Index Fund Fidelity Concord Street Trust	$18.2K	33.9K	0.50%	0.00%	August 31, 2026
VE Vanguard Extended Market Index Fund Vanguard Index Funds	$18K	25.7K	0.38%	0.00%	June 30, 2026

Fidelity Extended Market Index Fund

Fidelity Concord Street Trust

Position value

$18.2K

% of company

0.50%

% of the fund

0.00%

As of

August 31, 2026

Vanguard Extended Market Index Fund

Vanguard Index Funds

Position value

$18K

% of company

0.38%

% of the fund

0.00%

As of

June 30, 2026

3 more funds behind a free account

See every fund holding Mustang Bio 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
FB Fortress Biotech, Inc. 5%+ holder 13D · 8.0%	537.2K	7.98%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company7.980% Disclosed stake13D · 8.0% View the 13D/G filing →
HN Herskowitz Neil Insider	2.3K	0.03%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.030% Herskowitz Neil's insider activity →

Fortress Biotech, Inc.

5%+ holder13D · 8.0%

537.2K

% of company

7.98%

Change vs last qtr

—

Held since

—

Herskowitz Neil

Insider

2.3K

% of company

0.03%

Change vs last qtr

—

Held since

—

3 more holders behind a free account

See every insider and 5%+ holder of Mustang Bio Inc.

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