Company profile
GT Biopharma, Inc. Insider Trading
GTBPEvery SEC Form 4 insider trading filing for GT Biopharma, Inc. (GTBP) since April 2023 — open-market buys and sells by directors and officers, option exercises, and cluster activity, updated as each filing is reported to the SEC. Why 2023?
- Exchange
- Nasdaq
- Sector
- Pharmaceutical Preparations
- CIK
- 0000109657
- Filings
- 11
- Insiders
- 6
- Last filing
- 2025-09-04
Activity summary
No insider transactions in the last 30 days. The most recent was on September 4, 2025, when Michael Martin Breen bought 100,000 shares. 11 filings from 6 insiders are on record below.
Three year balance
Buy and sell value by quarter, Q2 23 to Q3 25. GT Biopharma, Inc. insiders are net buyers across the period shown.
Bars below the rule are sales, above are purchases. Largest quarter on the chart is $115K.
No insider activity recorded for GTBP in the last 90 days.
Insider Transactions
Sourced from SEC EDGAR Form 4 filings. Updated hourly.
| Date | Insider | Company | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 4, 2025 | Michael Martin Breen | GTBP | Award | 100,000 | — | — |
| Sep 4, 2025 | Michael Martin Breen | GTBP | Award | 100,000 | — | — |
| Sep 4, 2025 | Michael Martin Breen | GTBP | Award | 100,000 | — | — |
| Sep 4, 2025 | Charles J Casamento | GTBP | Award | 62,500 | — | — |
| Sep 4, 2025 | Hilary Kramer | GTBP | Award | 31,250 | — | — |
11 more transactions hidden
Free account · No credit card required
Building something? Get API access →
Query this yourself
The same rows, over the API.
curl "https://api.form4api.com/v1/transactions?ticker=GTBP" \
-H "X-Api-Key: $KEY"Top insiders
By total value filed.
Institutional Ownership
Top 13F-HR holders of GT Biopharma, Inc. as of 2026-06-30
Data source: quarterly 13F-HR filings — institutional holders report positions within 45 days of quarter end. Joined with insider activity above — see who's loading up institutionally while insiders are trading. Full 13F-HR API →