Moleculin Biotech, Inc. (MBRX) Ownership
MBRX ownership summary
as of October 17, 2026- Institutions
- 8.2% of shares outstanding
- Insiders
- 6.13% of shares outstanding
- Shares outstanding
- 20.4M
- Float
- 17.0M shares available to trade
- Short interest
- 1.01% 205K shares short
- Days to cover
- 0.17 short interest down 28.9% vs prior month
- Institutions 8.19%
- Insiders 6.13%
- Other investors 85.69%
MBRX top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Geode Capital Management, LLC | 0.23% | 47K | $13,231 | +14,923 (+46.2%) | June 30, 2026 |
| 2 | Vanguard Capital Management, LLC | 0.21% | 42K | $11,820 | +28,346 (+204.4%) | June 30, 2026 |
| 3 | Vanguard Fiduciary Trust Co | 0.15% | 30K | $8,367 | +23,811 (+392.1%) | June 30, 2026 |
| 4 | XTX Topco Ltd | 0.11% | 23K | $6,424 | +22,942 (0.0%) | June 30, 2026 |
| 5 | Morgan Stanley - Brokerage Accounts | 0.10% | 20K | $5,610 | +20,000 (+55,555.6%) | June 30, 2026 |
| 6 | Rockefeller Capital Management L.P. | 0.07% | 15K | $4,200 | +10,579 (+239.3%) | June 30, 2026 |
| 7 | Tower Research Capital LLC | 0.02% | 3,514 | $984 | +1,679 (+91.5%) | June 30, 2026 |
| 8 | Citigroup Inc | 0.01% | 2,674 | $749 | +2,674 (0.0%) | June 30, 2026 |
| 9 | Barclays PLC | <0.01% | 621 | $174 | +621 (0.0%) | June 30, 2026 |
| 10 | BlackRock Inc | <0.01% | 491 | $137 | — | June 30, 2026 |
| 11 | EFG International AG | <0.01% | 434 | $122 | — | June 30, 2026 |
| 12 | JONES FINANCIAL COMPANIES LLLP | <0.01% | 360 | $101 | +360 (0.0%) | June 30, 2026 |
| 13 | Wells Fargo & Co | <0.01% | 200 | $56 | +200 (0.0%) | June 30, 2026 |
| 14 | Newbridge Financial Services Group, Inc. | <0.01% | 114 | $32 | — | June 30, 2026 |
| 15 | SBI Securities Co Ltd | <0.01% | 44 | $12 | +1 (+2.3%) | June 30, 2026 |
| 16 | Danske Bank A/S. | 0.00% | 2 | $1 | — | June 30, 2026 |
| 17 | Advisor Group Holdings, Inc. | 0.00% | 1 | $0 | — | June 30, 2026 |
| 18 | CVA Family Office, LLC | 0.00% | 1 | $0 | — | June 30, 2026 |
| 19 | Jane Street Group LLC | 0.00% | — | — | −22,550 (−100.0%) | March 31, 2026 |
| 20 | Citadel Advisors Llc | 0.00% | — | — | −33,085 (−100.0%) | March 31, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 12 holders added 126K shares and 2 cut 56K.
MBRX top mutual fund and ETF holders
4 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Fidelity Extended Market Index | 0.28% | 56K | $15,710 | +28,668 (+104.5%) | August 31, 2026 |
| 2 | Fidelity Series Total Market Index | 0.04% | 7,991 | $2,237 | — | August 31, 2026 |
| 3 | Fidelity Nasdaq Composite Index | 0.02% | 4,484 | $1,256 | — | August 31, 2026 |
| 4 | Fidelity Total Market Index | <0.01% | 915 | $256 | — | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
MBRX insider transactions
latest 2| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2025-06-23 | Jonathan P Foster | Buy | $9.25 | 10,810 | $99,992 |
| 2025-06-23 | Walter V Klemp | Buy | $9.25 | 27,027 | $250,000 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
MBRX shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns MBRX
Institutional investors own 8.2% of Moleculin Biotech's shares and insiders 6.13%. The largest holder is Geode Capital Management, LLC with 0.23% of the shares (47K), as of June 30, 2026. Among the top 20 institutions, 12 added shares and 2 reduced their stake in the latest filings. Short interest is 1.01% of the float, or 0.17 days of average trading volume. The share count rose 168,278.9% since 2015.
Related: MBRX analyst forecast, MBRX key metrics. See the MBRX stock overview for the latest quote and news.
MBRX ownership FAQ
Who owns the most Moleculin Biotech stock?
The largest shareholders of Moleculin Biotech are Geode Capital Management, LLC (0.23%), Vanguard Capital Management, LLC (0.21%), Vanguard Fiduciary Trust Co (0.15%), XTX Topco Ltd (0.11%), Morgan Stanley - Brokerage Accounts (0.10%).
What percentage of Moleculin Biotech is owned by institutions?
Institutions hold 8.2% of Moleculin Biotech's shares outstanding; insiders hold 6.13%.
Which funds own Moleculin Biotech?
The largest fund holders of Moleculin Biotech are Fidelity Extended Market Index (0.28%), Fidelity Series Total Market Index (0.04%), Fidelity Nasdaq Composite Index (0.02%), Fidelity Total Market Index (<0.01%).
What is Moleculin Biotech's short interest?
205K shares of Moleculin Biotech were sold short, 1.01% of the float; at the average daily volume it would take 0.17 days to cover.
Are insiders buying or selling Moleculin Biotech?
Of the latest 2 reported insider transactions in Moleculin Biotech (since June 23, 2025), 2 were purchases and 0 were sales.
How many shares of Moleculin Biotech are outstanding?
Moleculin Biotech has 20.4M shares outstanding, of which 17.0M are in the public float.