Moleculin Biotech, Inc. (MBRX)
Data as of , from SEC Form 4 filings.
Net insider buying (90d)Watch MBRX
See up to 3 months of MBRX. The 7-day demo opens the 1M and 3M ranges and puts MBRX on your watchlist.
Start 7-day demoLatest MBRX insider trades
About Moleculin Biotech, Inc. (MBRX)
Moleculin Biotech, Inc. is an SEC registrant, filing under CIK 0001659617, classified as pharmaceutical preparations. We track it alongside the rest of the Health Care sector. It filed a registration statement with the SEC on 29 July 2026 and has not yet priced an offering.
MBRX Form 4 activity by transaction type, last 90 days
| Form 4 transaction type | Transactions | Shares | Total value |
|---|---|---|---|
| Open-market purchase | 5 | 2,399,997 | - |
| Grant or award | 6 | 3,199,999 | |
| Option exercise | 4 | 675,000 | |
| Tax withholding / forfeiture | 2 | 79,144 |
Dollar totals cover purchases and sales only (codes P and S). Grants, option exercises, gifts and tax withholding are counted in shares, because none of them is a trade at a market price.
MBRX insider transactions (Form 4)
7529 Form 4 filings on record, the earliest from Nov 6, 2024, newest first.
| Traded | Insider | Transaction | Security | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Donald H. Picker - Officer | Grant or award | Stock Options (right to buy) | 250,000 | - footnote F2 | - | |
| ||||||
| Walter V. Klemp - Officer | Option exercise | Common Stock | 207,500 | - footnote F1 | - | |
| Walter V. Klemp - Officer | Tax withholding / forfeiture | Common Stock | 48,659 footnote F2 | $0.37 | $18K | |
| Walter V. Klemp - Officer | Grant or award | Options (right to buy) | 415,000 | - footnote F2 | - | |
| Walter V. Klemp - Officer | Grant or award | Restricted Stock Units | 415,000 | - footnote F2 | - | |
| Walter V. Klemp - Officer | Option exercise | Restricted Stock Units | 207,500 | $0.00 | - | |
| ||||||
| Jonathan P. Foster - Officer | Option exercise | Common Stock | 130,000 | - footnote F1 | - | |
| Jonathan P. Foster - Officer | Tax withholding / forfeiture | Common Stock | 30,485 footnote F2 | $0.37 | $11K | |
| Jonathan P. Foster - Officer | Grant or award | Stock Options (right to buy) | 260,000 | - footnote F4 | - | |
| Jonathan P. Foster - Officer | Grant or award | Restricted Stock Units | 260,000 | - footnote F4 | - | |
| Jonathan P. Foster - Officer | Option exercise | Restricted Stock Units | 130,000 | $0.00 | - | |
| ||||||
| Jonathan P. Foster - Officer | Open-market purchase | Common Stock | 293,333 | - footnote F1 | - | |
| Jonathan P. Foster - Officer | Open-market purchase | Series I Warrants | 879,999 | - footnote F1 | - | |
| ||||||
| Walter V. Klemp - Officer | Open-market purchase | Common Stock | 533,333 | - footnote F1 | - | |
| Walter V. Klemp - Officer | Grant or award | Series I Warrants | 1,599,999 | - footnote F1 | - | |
| ||||||
| Donald H. Picker - Officer | Open-market purchase | Common Stock | 173,333 | - footnote F1 | - | |
| Donald H. Picker - Officer | Open-market purchase | Series I Warrants | 519,999 | - footnote F1 | - | |
| ||||||
| Donald H. Picker - Officer | Tax withholding / forfeiture | Common Stock | 21 footnote F2 | $3.12 | $66 | |
| Donald H. Picker - Officer | Option exercise | Restricted Stock Units | 44 | $0.00 | - | |
| Donald H. Picker - Officer | Option exercise | Restricted Stock Units | 71 | $0.00 | - | |
| Donald H. Picker - Officer | Option exercise | Common Stock | 44 | - footnote F1 | - | |
| Donald H. Picker - Officer | Tax withholding / forfeiture | Common Stock | 13 footnote F2 | $2.88 | $37 | |
| Donald H. Picker - Officer | Option exercise | Common Stock | 71 | - footnote F1 | - | |
| ||||||
| Walter V. Klemp - Officer | Option exercise | Common Stock | 150 | - footnote F1 | - | |
| Walter V. Klemp - Officer | Tax withholding / forfeiture | Common Stock | 37 footnote F2 | $2.88 | $107 | |
| Walter V. Klemp - Officer | Option exercise | Common Stock | 360 | - footnote F1 | - | |
| Walter V. Klemp - Officer | Tax withholding / forfeiture | Common Stock | 88 footnote F2 | $3.12 | $275 | |
| Walter V. Klemp - Officer | Option exercise | Restricted Stock Units | 150 | $0.00 | - | |
| Walter V. Klemp - Officer | Option exercise | Restricted Stock Units | 360 | $0.00 | - | |
| ||||||
| Jonathan P. Foster - Officer | Option exercise | Common Stock | 109 | - footnote F1 | - | |
| Jonathan P. Foster - Officer | Tax withholding / forfeiture | Common Stock | 31 footnote F2 | $2.88 | $89 | |
| Jonathan P. Foster - Officer | Option exercise | Common Stock | 174 | - footnote F1 | - | |
| Jonathan P. Foster - Officer | Tax withholding / forfeiture | Common Stock | 41 footnote F2 | $3.12 | $128 | |
| Jonathan P. Foster - Officer | Option exercise | Restricted Stock Units | 109 | $0.00 | - | |
| Jonathan P. Foster - Officer | Option exercise | Restricted Stock Units | 174 | $0.00 | - | |
| ||||||
| Joy Yan - Director | Grant or award | Stock Options (right to buy) | 150,000 | - footnote F2 | - | |
| ||||||
| Robert E. George - Director | Grant or award | Stock Options (right to buy) | 150,000 | - footnote F2 | - | |
| ||||||
| John M. Climaco - Director | Grant or award | Stock Options (right to buy) | 150,000 | - footnote F2 | - | |
| ||||||
| Jonathan P. Foster - Officer | Grant or award | Stock option (right to buy) | 600,000 | - footnote F2 | - | |
| Jonathan P. Foster - Officer | Grant or award | Performance Based Restricted Stock Units | 400,000 | - footnote F2 | - | |
| ||||||
| Elizabeth Cermak - Director | Grant or award | Stock Options (right to buy) | 150,000 | - footnote F2 | - | |
| ||||||
| Donald H. Picker - Officer | Grant or award | Stock option (right to buy) | 200,000 | - footnote F2 | - | |
| Donald H. Picker - Officer | Grant or award | Performance Based Restricted Stock Units | 200,000 | - footnote F2 | - | |
| ||||||
| Michael D. Cannon - Director | Grant or award | Stock Options (right to buy) | 150,000 | - footnote F2 | - | |
| ||||||
| Walter V. Klemp - Officer | Grant or award | Stock option (right to buy) | 830,000 | - footnote F2 | - | |
| Walter V. Klemp - Officer | Grant or award | Performance Based Restricted Stock Units | 750,000 | - footnote F2 | - | |
| ||||||
| Jonathan P. Foster - Officer | Option exercise | Common Stock | 20,625 | - footnote F1 | - | |
| Jonathan P. Foster - Officer | Option exercise | Common Stock | 5,023 footnote F2 | $0.50 | $2K | |
| Jonathan P. Foster - Officer | Option exercise | Restricted Stock Units | 20,625 | $0.00 | - | |
| ||||||
| Donald H. Picker - Officer | Option exercise | Common Stock | 8,750 | - footnote F1 | - | |
| Donald H. Picker - Officer | Tax withholding / forfeiture | Common Stock | 2,131 footnote F2 | $0.50 | $1K | |
| Donald H. Picker - Officer | Option exercise | Restricted Stock Units | 8,750 | $0.00 | - | |
| ||||||
| Walter V. Klemp - Officer | Option exercise | Common Stock | 28,750 | - footnote F1 | - | |
| Walter V. Klemp - Officer | Tax withholding / forfeiture | Common Stock | 7,001 footnote F2 | $0.50 | $3K | |
| Walter V. Klemp - Officer | Option exercise | Restricted Stock Units | 28,750 | $0.00 | - | |
| ||||||
| Donald H. Picker - Officer | Option exercise | Common Stock | 1,078 | - | - | |
| Donald H. Picker - Officer | Tax withholding / forfeiture | Common Stock | 263 | $0.27 | $70 | |
| Donald H. Picker - Officer | Option exercise | Common Stock | 1,766 | - | - | |
| Donald H. Picker - Officer | Tax withholding / forfeiture | Common Stock | 430 | $0.27 | $115 | |
| Donald H. Picker - Officer | Option exercise | Restricted Stock Units | 1,078 | $0.00 | - | |
| Donald H. Picker - Officer | Option exercise | Restricted Stock Units | 1,766 | $0.00 | - | |
| Joy Yan - Director | Grant or award | Stock option (right to buy) | 10,000 | - | - | |
| Robert E. George - Director | Grant or award | Stock option (right to buy) | 10,000 | - | - | |
| Walter V. Klemp - Officer | Grant or award | Stock option (right to buy) | 100,000 | - | - | |
| Walter V. Klemp - Officer | Grant or award | Restricted Stock Units | 115,000 | - | - | |
| Walter V. Klemp - Officer | Grant or award | Performance Based Restricted Stock Units | 43,590 | - | - | |
| John M. Climaco - Director | Grant or award | Stock option (right to buy) | 10,000 | - | - | |
| Jonathan P. Foster - Officer | Grant or award | Stock option (right to buy) | 65,000 | - | - | |
| Jonathan P. Foster - Officer | Grant or award | Restricted Stock Units | 82,500 | - | - | |
| Jonathan P. Foster - Officer | Grant or award | Performance Based Restricted Stock Units | 19,180 | - | - | |
| Elizabeth Cermak - Director | Grant or award | Stock option (right to buy) | 10,000 | - | - | |
| Donald H. Picker - Officer | Grant or award | Stock option (right to buy) | 40,000 | - | - | |
| Donald H. Picker - Officer | Grant or award | Restricted Stock Units | 35,000 | - | - | |
| Donald H. Picker - Officer | Grant or award | Performance Based Restricted Stock Units | 5,744 | - | - | |
| Michael D. Cannon - Director | Grant or award | Stock option (right to buy) | 10,000 | - | - | |
Item 7.01, 9.01
Item 1.05, 2.01, 3.03, 5.03, 8.01, 9.01
Item 7.01, 9.01
Item 5.02, 5.07, 9.01
Item 7.01, 9.01
MBRX insider trading FAQ
What is the latest insider trade for MBRX?
Moleculin Biotech, Inc. (MBRX) had 6 insider filings in the last 90 days, with the most recent on 17 October 2026. The full record for MBRX runs to 29 Form 4 filings, the earliest from 6 November 2024. InsiderAlpha adds new Form 4, Form 144 and 8-K filings as they arrive from SEC EDGAR.
How many insiders are buying MBRX stock?
5 insider purchases of MBRX were filed in the last 90 days.
How many insiders are selling MBRX stock?
No insider sales of MBRX were filed in the last 90 days.
Where can I see MBRX SEC filings (Form 4, 10-K, 10-Q, 8-K)?
This page collects MBRX Form 4 insider transactions, Form 144 sale notices and 8-K filings in one place. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
More Health Care companies with insider activity
Recent insider filings
10The EDGAR links open each original Form 4, so you can check any number on this page against the filing it came from.
- - Donald H. Picker view on EDGAR
- - Walter V. Klemp view on EDGAR
- - Jonathan P. Foster view on EDGAR
- - Jonathan P. Foster view on EDGAR
- - Walter V. Klemp view on EDGAR
- - Donald H. Picker view on EDGAR
- - Donald H. Picker view on EDGAR
- - Walter V. Klemp view on EDGAR
- - Jonathan P. Foster view on EDGAR
- - Joy Yan view on EDGAR
Related companies with recent insider activity
Learn more
- How to read insider buying signals
- What an open-market purchase by an insider can and cannot tell you.
- Insider activity in Health Care
- Where MBRX's peers are being bought and sold.
- Every recent Form 4
- The market-wide feed, updated as filings arrive from SEC EDGAR.
Follow MBRX with a 7-day demo
- MBRX on your watchlist
- Every MBRX Form 4 filing on record
- Up to 3 months of MBRX price history
- The daily trading plan of ranked insider buys, on a delay, with the plan archive
Start 7-day demoCard required. Your card is never charged for the demo.