MBRXNasdaqPharmaceutical PreparationsFiscal year ends December 31
Moleculin Biotech, Inc.
Financials through Q2 FY2026, quarter ended Jun 30, 2026Last filing: 10-Q on Aug 13, 2026
$0.27−0.02 (-5.49%)
Close on Oct 19, 2026
- Market cap
- $1.51M
- P/E (TTM)
- –
- Dividend yield
- –
Ownership
Institutional holdings as of Jun 30, 2026, from 13F filings
Held by institutions
1.0%
0M of 19M shares
Institutional holders
18
5 new, 7 sold out
Net institutional buying
0M
In Q2 2026
Insider trades, 12 months
3 buys · 0 sales
Net bought $0
Shares held by institutions
Holders of more than 5%
Latest Schedule 13D (active) or 13G (passive) filed by each holder
| Holder | Shares | % of class | Filing | As of |
|---|---|---|---|---|
| Steven Boyd | 339,767 | 9.99% | 13G (passive) amendment | Dec 31, 2024 |
| Klemp Walter V | 2,070,761 | 9.90% | 13D (active) | Aug 19, 2026 |
| CVI Investments, Inc. | 1,863,377 | 9.90% | 13G (passive) | Jul 31, 2026 |
| Foster Jonathan P. | 1,288,207 | 6.30% | 13D (active) | Aug 19, 2026 |
Top institutional holders
13F holdings as of Jun 30, 2026
| Holder | Shares | % of MBRX | Value | Change | % of portfolio |
|---|---|---|---|---|---|
| Geode Capital Management, LLC | 47,252 | 0.24% | $131.83K | +14,923 | 0.00% |
| Vanguard Capital Management LLC | 42,215 | 0.22% | $117.78K | +28,346 | 0.00% |
| Vanguard Fiduciary Trust Co | 29,883 | 0.15% | $83.37K | +23,811 | 0.00% |
| XTX Topco Ltd | 22,942 | 0.12% | $64.01K | New | 0.00% |
| Morgan Stanley | 20,036 | 0.10% | $55.90K | +20,000 | 0.00% |
| Rockefeller Capital Management L.P. | 15,000 | 0.08% | $41.85K | +10,579 | 0.00% |
| Tower Research Capital LLC (TRC) | 3,514 | 0.02% | $9.80K | +1,679 | 0.00% |
| Citigroup Inc | 2,674 | 0.01% | $7.46K | New | 0.00% |
| Barclays PLC | 621 | 0.00% | $1.73K | New | 0.00% |
| BlackRock, Inc. | 491 | 0.00% | $1.37K | – | 0.00% |
| EFG International AG | 434 | 0.00% | $1.21K | – | 0.00% |
| Jones Financial Companies Lllp | 360 | 0.00% | $1.18K | New | 0.00% |
| Wells Fargo & Company/Mn | 200 | 0.00% | $558 | New | 0.00% |
| Newbridge Financial Services Group, Inc. | 114 | 0.00% | $318 | – | 0.00% |
| SBI Securities Co., Ltd. | 44 | 0.00% | $123 | +1 | 0.00% |
| Danske Bank A/S | 2 | 0.00% | $6 | – | 0.00% |
| CVA Family Office, LLC | 1 | 0.00% | $3 | – | 0.00% |
| Osaic Holdings, Inc. | 1 | 0.00% | $2 | – | 0.00% |
Institutional buying and selling by quarter
Positions opened, added to, reduced and closed by 13F filers
| Quarter | Holders | Shares held | % of shares | New / added | Reduced / closed | Shares bought | Shares sold |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 18 | 0M | 1.0% | 5 / 7 | 0 / 7 | 0M | 0M |
| Q1 2026 | 20 | 0M | 0.8% | 7 / 4 | 2 / 3 | 0M | 0M |
| Q4 2025 | 17 | 0M | 0.5% | 17 / 0 | 0 / 0 | 0M | 0M |
Top mutual fund and ETF holders
Latest monthly portfolio reports (Form N-PORT)
| Fund | Shares | % of MBRX | Value | % of fund | As of |
|---|---|---|---|---|---|
| Vanguard Extended Market Index Fund | 28,274 | 0.15% | $78.88K | 0.00% | Jun 30, 2026 |
| Fidelity Extended Market Index Fund | 21,901 | 0.11% | $61.10K | 0.00% | May 31, 2026 |
| Fidelity Nasdaq Composite Index Fund | 4,484 | 0.02% | $12.51K | 0.00% | May 31, 2026 |
| Fidelity Series Total Market Index Fund | 3,142 | 0.02% | $8.77K | 0.00% | May 31, 2026 |
| Fidelity Total Market Index Fund | 915 | 0.00% | $2.55K | 0.00% | May 31, 2026 |
Officers, directors and major owners
People who filed Forms 3, 4 or 5 in the last two years
| Name | Role | Shares owned | % of shares | Latest filing |
|---|---|---|---|---|
| Walter V. Klemp | CEO and President, Director | 1,639,340 | 8.42% | Aug 5, 2026 |
| Jonathan P. Foster | Chief Financial Officer | 305,673 | 1.57% | Aug 5, 2026 |
| Donald H. Picker | Chief Science Officer | 726,086 | 3.73% | Aug 5, 2026 |
| John M. Climaco | Director | – | – | Nov 14, 2025 |
| Michael D. Cannon | Director | – | – | Nov 14, 2025 |
| Robert E. George | Director | 14,660 | 0.08% | Nov 14, 2025 |
| Elizabeth Cermak | Director | – | – | Nov 14, 2025 |
| Joy Yan | Director | – | – | Nov 14, 2025 |
Insider trades
Common stock transactions reported on Form 4, newest first
| Insider | Date | Transaction | Shares | Price | Value | Shares after |
|---|---|---|---|---|---|---|
| Donald H. Picker Chief Science Officer | Aug 3, 2026 | Buy | +173,333 | – | – | 174,086 |
| Jonathan P. Foster Chief Financial Officer | Aug 3, 2026 | Buy | +293,333 | – | – | 305,673 |
| Walter V. Klemp CEO and President, Director | Aug 3, 2026 | Buy | +533,333 | – | – | 564,340 |
| Jonathan P. Foster Chief Financial Officer | Jun 22, 2026 | Tax withholding | −41 | $3.12 | $128 | 12,340 |
| Jonathan P. Foster Chief Financial Officer | Jun 22, 2026 | Option exercise | +174 | – | – | 12,381 |
| Walter V. Klemp CEO and President, Director | Jun 22, 2026 | Tax withholding | −88 | $3.12 | $275 | 31,007 |
| Walter V. Klemp CEO and President, Director | Jun 22, 2026 | Option exercise | +360 | – | – | 31,088 |
| Donald H. Picker Chief Science Officer | Jun 22, 2026 | Option exercise | +71 | – | – | 774 |
| Donald H. Picker Chief Science Officer | Jun 22, 2026 | Tax withholding | −21 | $3.12 | $66 | 753 |
| Jonathan P. Foster Chief Financial Officer | Jun 20, 2026 | Tax withholding | −31 | $2.88 | $89 | 12,207 |
| Jonathan P. Foster Chief Financial Officer | Jun 20, 2026 | Option exercise | +109 | – | – | 12,238 |
| Walter V. Klemp CEO and President, Director | Jun 20, 2026 | Option exercise | +150 | – | – | 30,765 |
| Walter V. Klemp CEO and President, Director | Jun 20, 2026 | Tax withholding | −37 | $2.88 | $107 | 30,728 |
| Donald H. Picker Chief Science Officer | Jun 20, 2026 | Tax withholding | −13 | $2.88 | $37 | 703 |
| Donald H. Picker Chief Science Officer | Jun 20, 2026 | Option exercise | +44 | – | – | 716 |
| Jonathan P. Foster Chief Financial Officer | Nov 4, 2025 | Option exercise | −5,023 | $0.50 | $2.51K | 303,189 |
| Jonathan P. Foster Chief Financial Officer | Nov 4, 2025 | Option exercise | +20,625 | – | – | 308,212 |
| Donald H. Picker Chief Science Officer | Nov 4, 2025 | Option exercise | +8,750 | – | – | 18,902 |
| Donald H. Picker Chief Science Officer | Nov 4, 2025 | Tax withholding | −2,131 | $0.50 | $1.07K | 16,771 |
| Walter V. Klemp CEO and President, Director | Nov 4, 2025 | Tax withholding | −7,001 | $0.50 | $3.50K | 765,356 |
| Walter V. Klemp CEO and President, Director | Nov 4, 2025 | Option exercise | +28,750 | – | – | 772,357 |
| Walter V. Klemp CEO and President, Director | Jun 23, 2025 | Buy | +675,675 | $0.37 | $250.00K | 743,607 |
| Jonathan P. Foster Chief Financial Officer | Jun 23, 2025 | Buy | +270,270 | $0.37 | $100.00K | 287,587 |
| Walter V. Klemp CEO and President, Director | Jun 22, 2025 | Option exercise | +8,990 | – | – | 70,122 |
| Walter V. Klemp CEO and President, Director | Jun 22, 2025 | Tax withholding | −2,190 | $0.27 | $591 | 67,932 |
| Jonathan P. Foster Chief Financial Officer | Jun 22, 2025 | Option exercise | +4,328 | – | – | 18,371 |
| Jonathan P. Foster Chief Financial Officer | Jun 22, 2025 | Tax withholding | −1,054 | $0.27 | $285 | 17,317 |
| Donald H. Picker Chief Science Officer | Jun 22, 2025 | Option exercise | +1,766 | – | – | 10,582 |
| Donald H. Picker Chief Science Officer | Jun 22, 2025 | Tax withholding | −430 | $0.27 | $116 | 10,152 |
| Walter V. Klemp CEO and President, Director | Jun 20, 2025 | Tax withholding | −914 | $0.27 | $247 | 61,132 |
| Walter V. Klemp CEO and President, Director | Jun 20, 2025 | Option exercise | +3,750 | – | – | 62,046 |
| Jonathan P. Foster Chief Financial Officer | Jun 20, 2025 | Tax withholding | −661 | $0.27 | $178 | 14,043 |
| Jonathan P. Foster Chief Financial Officer | Jun 20, 2025 | Option exercise | +2,711 | – | – | 14,704 |
| Donald H. Picker Chief Science Officer | Jun 20, 2025 | Tax withholding | −263 | $0.27 | $71 | 8,816 |
| Donald H. Picker Chief Science Officer | Jun 20, 2025 | Option exercise | +1,078 | – | – | 9,079 |
| Walter V. Klemp CEO and President, Director | Jun 16, 2025 | Tax withholding | −406 | $0.69 | $280 | 58,296 |
| Walter V. Klemp CEO and President, Director | Jun 16, 2025 | Option exercise | +1,667 | – | – | 58,702 |
| Jonathan P. Foster Chief Financial Officer | Jun 16, 2025 | Option exercise | +833 | – | – | 12,196 |
| Jonathan P. Foster Chief Financial Officer | Jun 16, 2025 | Tax withholding | −203 | $0.69 | $140 | 11,993 |
| Walter V. Klemp CEO and President, Director | Jul 2, 2024 | Option exercise | +982 | – | – | 57,275 |
| Walter V. Klemp CEO and President, Director | Jul 2, 2024 | Tax withholding | −240 | $3.57 | $857 | 57,035 |
| Walter V. Klemp CEO and President, Director | Jun 22, 2024 | Option exercise | +8,990 | – | – | 58,483 |
| Walter V. Klemp CEO and President, Director | Jun 22, 2024 | Tax withholding | −2,190 | $3.74 | $8.19K | 56,293 |
| Jonathan P. Foster Chief Financial Officer | Jun 22, 2024 | Option exercise | +4,329 | – | – | 12,416 |
| Jonathan P. Foster Chief Financial Officer | Jun 22, 2024 | Tax withholding | −1,053 | $3.74 | $3.94K | 11,363 |
| Donald H. Picker Chief Science Officer | Jun 22, 2024 | Tax withholding | +524 | $3.74 | $1.96K | 8,001 |
| Donald H. Picker Chief Science Officer | Jun 22, 2024 | Option exercise | +1,766 | – | – | 8,525 |
| Walter V. Klemp CEO and President, Director | Jun 20, 2024 | Tax withholding | −914 | $3.78 | $3.45K | 49,493 |
| Walter V. Klemp CEO and President, Director | Jun 20, 2024 | Option exercise | +3,750 | – | – | 50,407 |
| Donald H. Picker Chief Science Officer | Jun 20, 2024 | Tax withholding | −320 | $3.78 | $1.21K | 6,759 |
| Donald H. Picker Chief Science Officer | Jun 20, 2024 | Option exercise | +1,078 | – | – | 7,079 |
| Jonathan P. Foster Chief Financial Officer | Jun 20, 2024 | Tax withholding | −636 | $3.78 | $2.40K | 8,087 |
| Jonathan P. Foster Chief Financial Officer | Jun 20, 2024 | Option exercise | +2,712 | – | – | 8,723 |
| Walter V. Klemp CEO and President, Director | Jun 16, 2024 | Tax withholding | −406 | $4.14 | $1.68K | 46,657 |
| Walter V. Klemp CEO and President, Director | Jun 16, 2024 | Option exercise | +1,667 | – | – | 47,063 |
| Jonathan P. Foster Chief Financial Officer | Jun 16, 2024 | Tax withholding | −196 | $4.14 | $811 | 6,011 |
| Jonathan P. Foster Chief Financial Officer | Jun 16, 2024 | Option exercise | +834 | – | – | 6,207 |
| Robert E. George Director | Dec 26, 2023 | Buy | +14,493 | $0.69 | $10.00K | 14,660 |
| Walter V. Klemp CEO and President, Director | Dec 26, 2023 | Buy | +188,404 | $0.69 | $130.00K | 680,880 |
| Jonathan P. Foster Chief Financial Officer | Dec 26, 2023 | Buy | +28,986 | $0.69 | $20.00K | 80,556 |
Awards, option exercises, tax withholding and gifts are shown alongside open-market buys and sales. Each name links to the filing on SEC EDGAR.