Moleculin Biotech, Inc.
Moleculin Biotech, Inc. (MBRX) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · MBRX · as of Sep 30, 2025
Ownership Breakdown
24
Institutional Holders
▲ 2 vs Q2
$412,657
Total Inst. Value
▲ $281,784 vs Q2
1.21M
Shares Outstanding
freeFloat 97.86%
778,273
13F Shares Held
▲ 345,621 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
MBRX largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
VANGUARD GROUP INC pharmaceutical preparations | 239.9K | 8.10% | 8.10% | $127.16M | Nov 7, 2025 | ▲ 209.0K |
GEODE CAPITAL MANAGEMENT, LLC pharmaceutical preparations | 208.2K | 7.03% | 7.03% | $110.35M | Nov 12, 2025 | ▲ 180.7K |
HRT FINANCIAL LP pharmaceutical preparations | 115.2K | 3.89% | 3.89% | $61.00M | Nov 14, 2025 | NEW |
LPL FINANCIAL LLC pharmaceutical preparations | 58.1K | 1.96% | 1.96% | $30.78M | Nov 12, 2025 | ▲ 2.0K |
IEQ CAPITAL, LLC pharmaceutical preparations | 36.4K | 1.23% | 1.23% | $19.27M | Nov 14, 2025 | NEW |
WEALTH DIMENSIONS GROUP, LTD. pharmaceutical preparations | 20.0K | 0.68% | 0.68% | $10.60M | Oct 30, 2025 | NEW |
ROCKEFELLER CAPITAL MANAGEMENT L.P. pharmaceutical preparations | 14.5K | 0.49% | 0.49% | $7.69M | Nov 14, 2025 | NEW |
CAMBRIDGE INVESTMENT RESEARCH ADVISORS, INC. pharmaceutical preparations | 12.8K | 0.43% | 0.43% | $7.00M | Nov 12, 2025 | — held |
GOLDMAN SACHS GROUP INC pharmaceutical preparations | 12.8K | 0.43% | 0.43% | $6.76M | Nov 14, 2025 | NEW |
BLACKROCK, INC. pharmaceutical preparations | 12.4K | 0.42% | 0.42% | $6.56M | Nov 12, 2025 | — held |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
5
Increased
+396.2K shares8
New Positions
first time holders1
Decreased
−4.0K shares6
Sold Out
fully exitedNet shares change (top 50)
+392.2K
+396.2K / −4.0K
Net new holders
+6
8 new / 6 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
MBRX insider trading · insider activity
Source: SEC Form 4
14
Buy transactions
6
Sell transactions
2.33
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
PICKER DONALD H CSO | Nov 12, 2025 | Award | 200,000 | — | — | 495.5K | Form 4 ↗ |
PICKER DONALD H CSO | Nov 12, 2025 | Award | 200,000 | $0.49 | $98.0K | 295.5K | Form 4 ↗ |
Foster Jonathan P. EVP & CFO | Nov 12, 2025 | Award | 400,000 | — | — | 2.02M | Form 4 ↗ |
Foster Jonathan P. EVP & CFO | Nov 12, 2025 | Award | 600,000 | $0.49 | $294.0K | 1.62M | Form 4 ↗ |
KLEMP WALTER V CEO and President | Nov 12, 2025 | Award | 750,000 | — | — | 3.96M | Form 4 ↗ |
KLEMP WALTER V CEO and President | Nov 12, 2025 | Award | 830,000 | $0.49 | $406.7K | 3.21M | Form 4 ↗ |
Yan Joy director | Nov 12, 2025 | Award | 150,000 | $0.49 | $73.5K | 164.0K | Form 4 ↗ |
Cermak Elizabeth director | Nov 12, 2025 | Award | 150,000 | $0.49 | $73.5K | 164.7K | Form 4 ↗ |
CANNON MICHAEL D director | Nov 12, 2025 | Award | 150,000 | $0.49 | $73.5K | 165.3K | Form 4 ↗ |
Climaco John M director | Nov 12, 2025 | Award | 150,000 | $0.49 | $73.5K | 165.2K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Moleculin Biotech, Inc. (MBRX) is primarily owned by institutional investors, who hold approximately 64.4% of total shares outstanding. Company insiders own approximately 2.14%, while retail and public investors account for the remaining 33.49%.
The largest institutional shareholder of Moleculin Biotech, Inc. is VANGUARD GROUP INC, holding approximately 239,919 shares — equal to 8.10% of outstanding shares — as of September 30, 2025.
A total of 24 institutional investors currently hold MBRX stock, with a combined institutional value of approximately $412,657 as of the most recent 13F filing period.
Frequently asked questions
MBRX ownershipMoleculin Biotech, Inc. (MBRX) is primarily owned by institutional investors, who hold approximately 64.4% of shares. The largest shareholder is VANGUARD GROUP INC with a 8.10% stake. Company insiders hold 2.14%. Data sourced from SEC Form 13F as of September 30, 2025.