MBRX
Moleculin Biotech, Inc.Company with tickers: MBRX
CIK
1659617
CUSIP
60855D408
Shares Outstanding
5,336,350
13F Activity (30d)
18 filings
18 filers
Holders: 20
Total Value: $348,361
Total Shares: 152,127
Institutional Ownership Trend
Holder Concentration
Across 20 13F filers · Δ vs Dec 31, 2025Top Holder
49.3%
+14.6 pts
Top 5
92.7%
−4.1 pts
Top 10
99.7%
−0.1 pts
HHI
3,079
Highly concentrated
+751
Quarterly Activity
vs Dec 31, 2025
New
7
Increased
4
Decreased
2
Sold Out
4
Unchanged
7
Holder count:
+3
Institutional value:
+10.5%
Shares held:
+59.8%
Top Buyers
vs Dec 31, 2025| Institution | Added | Now Holds | Open |
|---|---|---|---|
| Mega GEODE CAPITAL MANAGEMENT, LLC | +17,191 | 32,329 | |
| Large Rockefeller Capital Management L.P. | +4,203 | 4,421 | |
| Mid Tower Research Capital LLC (TRC) | +442 | 1,835 | |
| Mid SBI Securities Co., Ltd. | +14 | 43 |
Top Sellers
vs Dec 31, 2025| Institution | Sold | Now Holds | Open |
|---|---|---|---|
| Mega UBS Group AG | −2,454 | 3,409 | |
| Mega BlackRock, Inc. | −4 | 491 |
Top New Positions
vs Dec 31, 2025| Institution | Acquired | Value (USD) | Open |
|---|---|---|---|
| Micro SABBY MANAGEMENT, LLC | 75,021 | $171,798 | |
| Mega VANGUARD CAPITAL MANAGEMENT LLC | 13,869 | $31,760 | |
| Large HRT FINANCIAL LP | 13,739 | $31,462 | |
| Mega VANGUARD FIDUCIARY TRUST CO | 6,072 | $13,904 | |
| Mega Vanguard Global Advisers, LLC | 24 | $54 |
Top Sold-Out Positions
vs Dec 31, 2025| Institution | Previously Held | Last Value (USD) | Open |
|---|---|---|---|
| Mega CITADEL ADVISORS LLC | 33,085 | $109,511 | |
| Mega JANE STREET GROUP, LLC | 22,550 | $74,640 | |
| Mega VANGUARD GROUP INC | 15,544 | $51,449 | |
| Mega BANK OF AMERICA CORP /DE/ | 36 | $118 |
| Holder | Value (USD) | % of 13F | Shares | Type | Discretion | Filed | Open | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Micro SABBY MANAGEMENT, LLC | $171,798 | 49.32% | 75,021 | Shares | Defined | 2026-05-15 | ||||
| Mega GEODE CAPITAL MANAGEMENT, LLC | $74,033 | 21.25% | 32,329 | Shares | Defined | 2026-05-15 | ||||
| Mega VANGUARD CAPITAL MANAGEMENT LLC | $31,760 | 9.12% | 13,869 | Shares | Defined | 2026-05-08 | ||||
| Large HRT FINANCIAL LP | $31,462 | 9.03% | 13,739 | Shares | Defined | 2026-05-14 | ||||
| Mega VANGUARD FIDUCIARY TRUST CO Bank | $13,904 | 3.99% | 6,072 | Shares | Defined | 2026-05-08 | ||||
| Large Rockefeller Capital Management L.P. | $10,124 | 2.91% | 4,421 | Shares | Defined | 2026-05-14 | ||||
| Mega UBS Group AG | $7,806 | 2.24% | 3,409 | Shares | Defined | 2026-05-05 | ||||
| Mid Tower Research Capital LLC (TRC) | $4,202 | 1.21% | 1,835 | Shares | Defined | 2026-05-15 | ||||
| Mega BlackRock, Inc. | $1,124 | 0.32% | 491 | Shares | Sole | 2026-05-13 | ||||
| Mid EFG International AG | $993 | 0.29% | 434 | Shares | Defined | 2026-05-15 | ||||
| Small Pinnacle Wealth Planning Services, Inc. | $643 | 0.18% | 281 | Shares | Sole | 2026-05-11 | ||||
| Small NFSG Corp | $261 | 0.07% | 114 | Shares | Sole | 2026-05-05 | ||||
| Mid SBI Securities Co., Ltd. Broker-Dealer | $98 | 0.03% | 43 | Shares | Defined | 2026-04-28 | ||||
| Mega MORGAN STANLEY | $81 | 0.02% | 36 | Shares | Defined | 2026-05-15 | ||||
| Mega Vanguard Global Advisers, LLC | $54 | 0.02% | 24 | Shares | Defined | 2026-05-08 | ||||
| Mega FMR LLC | $6 | 0.00% | 3 | Shares | Defined | 2026-05-15 | ||||
| Large DANSKE BANK A/S Bank | $4 | 0.00% | 2 | Shares | Sole | 2026-05-12 | ||||
| Small Caitong International Asset Management Co., Ltd | $4 | 0.00% | 2 | Shares | Sole | 2026-05-11 | ||||
| Small CVA Family Office, LLC Family Office | $2 | 0.00% | 1 | Shares | Sole | 2026-04-29 | ||||
| Large OSAIC HOLDINGS, INC. | $2 | 0.00% | 1 | Shares | Defined | 2026-05-15 | ||||
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