GTBP 424B3: Shelf registration
GT Biopharma
Filed with the SEC on · accession 0001493152-26-047792
GTBP filed a 424B3 (prospectus (offering)) with the SEC on Oct 20, 2026. GT Biopharma filed a 424B3 prospectus to register up to 13,502,835 shares of common stock for resale by selling stockholders, consisting of shares issuable upon conversion of Series M and Series L preferred stock, warrants, and dividend shares. The stock moved +9.3% by the first close after the filing.
Summary of the filing
GT Biopharma filed a 424B3 prospectus to register up to 13,502,835 shares of common stock for resale by selling stockholders, consisting of shares issuable upon conversion of Series M and Series L preferred stock, warrants, and dividend shares. The company will not receive any proceeds from the sale of these shares.
Key details
How GTBP stock reacted
Close before
$6.69
Oct 19, 2026
First close after
+9.27%
$7.31
5 trading days
-24.22%
$5.07
Since filing
-40.06%
$4.01
✦ Ask GOAX AI about this filing — what it means for GTBP, what changed since its last filings and what to watch next.
Try it free for 7 days🔔 Want to stay updated on new SEC filings for GTBP?
Click hereFrequently asked questions
What did GTBP file with the SEC on Oct 20, 2026?
GTBP filed a 424B3 (Shelf registration). GT Biopharma filed a 424B3 prospectus to register up to 13,502,835 shares of common stock for resale by selling stockholders, consisting of shares issuable upon conversion of Series M and Series L preferred stock, warrants, and dividend shares. The company will not receive any proceeds from the sale of these shares.
What does a shelf registration mean for GTBP stock?
New shares dilute existing holders and are often sold at a discount to the market price.
How do I read a 424B3?
The final terms of an offering of shares or bonds. Look at price, number of shares and the discount to the market price. Large offerings dilute existing shareholders.
Why are SEC filings important?
Public companies must tell the SEC about anything that can change their value — results, leadership changes, big deals, new shares, bankruptcy. Filings are the official source, often before the news. A 424B3 (prospectus (offering)): The final terms of an offering of shares or bonds.
How did GTBP stock react to this filing?
GTBP closed at $6.69 before the filing and $7.31 on Oct 20, 2026 (+9.27%). Five trading days later: $5.07 (-24.22%).
Other GTBP SEC filings
Get alerts when GTBP files with the SEC, plus live charts, key levels and news for 13,000+ stocks.
Try SEPT free for 7 days