$MBRX

$8.75 -$0.52 (5.61%) Close

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

Ownership

13F as of Q2 2026 · 1.1M shares outstanding

Who owns MBRX?

By type of holder

Institutions 17.7% Insiders 82.3% Everyone else 0.0%

Concentration Top 10 holders own 411.5%

Klemp Walter V 197.2% · Foster Jonathan P. 122.7%

Institutional ownership

17.7%

+3.2 pts vs last qtr

Institutional holders

-2 vs last qtr

Net shares bought

+33.7K

by institutions in Q2 2026

New / sold out

5 / 7

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Vanguard Capital Management LLC +28.3K
Vanguard Fiduciary Trust Co +23.8K

Biggest sellers in Q2 2026

Sabby Management, LLC SOLD OUT −75.0K
HRT Financial LP SOLD OUT −13.7K

Who is planning to sell?

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

Is your stake being diluted?

There are not yet two fiscal years of reported share counts for Moleculin Biotech Inc.

How patient are the owners?

Institutional shares by how long they've been held

5+ years0% 3–5 years0% 1–3 years77% Under 1 year23%

Quarterly turnover

71.9%

of institutional shares changed hands

Top 10 managers, median time held

2.3 years

Super Investors

Investment managers reporting MBRX on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
SM Sabby Management, LLC	—	—	SOLD OUT	—	0.0%
Shares held by quarter Peak holding75.0K (Q1'26) Change over 8 quarters0 Sabby Management, LLC's full portfolio →
GC Geode Capital Management, LLC	47.3K	4.50%	+14.9K (+46.2%)	2024	0.0%
Shares held by quarter Peak holding208.2K (Q3'25) Change over 8 quarters+25.4K Share of the company4.500% Geode Capital Management, LLC's full portfolio →

Sabby Management, LLC

—

% of company

—

Change vs last qtr

SOLD OUT

Held since

—

Geode Capital Management, LLC

47.3K

% of company

4.50%

Change vs last qtr

+14.9K (+46.2%)

Held since

2024

21 more super investors behind a free account

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

Institutional Funds

Mutual funds and ETFs reporting MBRX on Form N-PORT; together they hold 9.3% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VE Vanguard Extended Market Index Fund Vanguard Index Funds	$78.9K	28.3K	2.69%	0.00%	June 30, 2026
FE Fidelity Extended Market Index Fund Fidelity Concord Street Trust	$36.2K	56.1K	5.34%	0.00%	August 31, 2026

Vanguard Extended Market Index Fund

Vanguard Index Funds

Position value

$78.9K

% of company

2.69%

% of the fund

0.00%

As of

June 30, 2026

Fidelity Extended Market Index Fund

Fidelity Concord Street Trust

Position value

$36.2K

% of company

5.34%

% of the fund

0.00%

As of

August 31, 2026

3 more funds behind a free account

See every fund holding Moleculin Biotech 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
KW Klemp Walter V 5%+ holder 13D · 9.9%	2.1M	197.22%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company197.220% Disclosed stake13D · 9.9% View the 13D/G filing →
FJ Foster Jonathan P. 5%+ holder 13D · 6.3%	1.3M	122.69%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company122.690% Disclosed stake13D · 6.3% View the 13D/G filing →

Klemp Walter V

5%+ holder13D · 9.9%

2.1M

% of company

197.22%

Change vs last qtr

—

Held since

—

Foster Jonathan P.

5%+ holder13D · 6.3%

1.3M

% of company

122.69%

Change vs last qtr

—

Held since

—

1 more holders behind a free account

See every insider and 5%+ holder of Moleculin Biotech Inc.

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