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Offerings // Moleculin Biotech, Inc.

MBRX offering history

Every offering-related filing in Moleculin Biotech, Inc.’s recent SEC record — registrations (announced capacity) kept separate from pricing documents (executed sales). Reviewed 805 filings back to Dec 4, 2015.

Last executed offering
Feb 20, 2026
8-K — priced deal (shares or notes)
Last registration (announced)
Jul 31, 2026
S-1/A — capacity, not a sale
Executed, last 12 months
4
424B pricings + 8-K 3.02 sales
Registered, last 12 months
6
S-1/S-3/F-series registrations
DateFilingWhat it means
Jul 31, 2026S-1/A →REGISTEREDS-1/A registration — capacity to sell shares, not a sale yet
Jul 30, 2026S-1/A →REGISTEREDS-1/A registration — capacity to sell shares, not a sale yet
Jul 29, 2026S-1 →REGISTEREDS-1 registration — capacity to sell shares, not a sale yet
Apr 14, 2026424B3 →UPDATEProspectus update — often a resale registration, not necessarily new capital
Apr 14, 2026EFFECT →EFFECTIVESEC declared a registration effective — selling can begin
Mar 27, 2026S-3 →REGISTEREDS-3 registration — capacity to sell shares, not a sale yet
Feb 20, 20268-K →EXECUTEDUnregistered share sale disclosed (8-K item 3.02)
Jan 6, 2026EFFECT →EFFECTIVESEC declared a registration effective — selling can begin
Dec 23, 2025424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Dec 23, 2025S-3 →REGISTEREDS-3 registration — capacity to sell shares, not a sale yet
Dec 10, 20258-K →EXECUTEDUnregistered share sale disclosed (8-K item 3.02)
Oct 3, 2025424B3 →UPDATEProspectus update — often a resale registration, not necessarily new capital
Sep 30, 2025EFFECT →EFFECTIVESEC declared a registration effective — selling can begin
Sep 19, 2025S-3 →REGISTEREDS-3 registration — capacity to sell shares, not a sale yet
Aug 29, 20258-K →EXECUTEDUnregistered share sale disclosed (8-K item 3.02)
Jul 11, 2025424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Jun 23, 2025424B4 →EXECUTEDFinal prospectus — offering priced (typical for IPOs and marketed share deals)
Jun 20, 2025EFFECT →EFFECTIVESEC declared a registration effective — selling can begin
Jun 16, 2025S-1/A →REGISTEREDS-1/A registration — capacity to sell shares, not a sale yet
Jun 11, 2025S-1/A →REGISTEREDS-1/A registration — capacity to sell shares, not a sale yet
Jun 6, 2025S-1/A →REGISTEREDS-1/A registration — capacity to sell shares, not a sale yet
Jun 2, 2025S-1 →REGISTEREDS-1 registration — capacity to sell shares, not a sale yet
Apr 7, 2025EFFECT →EFFECTIVESEC declared a registration effective — selling can begin
Mar 31, 2025S-1 →REGISTEREDS-1 registration — capacity to sell shares, not a sale yet
Feb 26, 2025424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Feb 26, 20258-K →EXECUTEDUnregistered share sale disclosed (8-K item 3.02)
Feb 24, 2025RW →WITHDRAWNRegistration withdrawn
Feb 13, 20258-K →EXECUTEDUnregistered share sale disclosed (8-K item 3.02)
Feb 11, 2025S-1/A →REGISTEREDS-1/A registration — capacity to sell shares, not a sale yet
Feb 10, 2025S-1/A →REGISTEREDS-1/A registration — capacity to sell shares, not a sale yet
Jan 29, 2025S-1/A →REGISTEREDS-1/A registration — capacity to sell shares, not a sale yet
Dec 13, 2024S-1 →REGISTEREDS-1 registration — capacity to sell shares, not a sale yet
Dec 9, 2024EFFECT →EFFECTIVESEC declared a registration effective — selling can begin
Aug 19, 2024424B3 →UPDATEProspectus update — often a resale registration, not necessarily new capital
Aug 16, 2024424B4 →EXECUTEDFinal prospectus — offering priced (typical for IPOs and marketed share deals)
Aug 15, 2024S-1/A →REGISTEREDS-1/A registration — capacity to sell shares, not a sale yet
Aug 15, 2024S-1/A →REGISTEREDS-1/A registration — capacity to sell shares, not a sale yet
Aug 15, 2024EFFECT →EFFECTIVESEC declared a registration effective — selling can begin
Jul 30, 2024S-1/A →REGISTEREDS-1/A registration — capacity to sell shares, not a sale yet
Jul 22, 2024S-1 →REGISTEREDS-1 registration — capacity to sell shares, not a sale yet
MBRX offering-related filings from SEC EDGAR, newest first (capped at 40). Each links to the original document.

Two honest limits. (1) A 424B takedown can price shares or notes— EDGAR’s metadata doesn’t say which, so open the document: large investment-grade filers use these mostly for bond deals (no dilution), small-caps mostly for shares. (2) At-the-market (ATM) programs sell shares gradually and individual sales are not separately filed — the visible footprint is the enabling shelf and its 424B5; actual ATM share counts surface later in the 10-Q/10-K share count. Educational information from public filings, not investment advice.

Is a shelf active now? →Do they need money? →Red flags →Full MBRX workspace →
MBRX offering FAQ

When did MBRX last execute an offering?

Per SEC filings, Moleculin Biotech, Inc.'s most recent priced offering document is a 8-K filed 2026-02-20. Note a 424B takedown can price shares or notes (debt) — the linked document says which.

When did MBRX last announce or register an offering?

The most recent registration is a S-1/A filed 2026-07-31. A registration is capacity to sell shares — not a sale.

Does an offering always mean dilution?

Registered direct offerings and shelf takedowns issue new shares and dilute existing holders. Resale registrations (424B3/B7) let existing holders sell and do not create new shares. Secondary sales by insiders also do not dilute. Each row here is labeled with what it is.