GT Biopharma, Inc.
GT Biopharma, Inc. is a registered legal entity registered in United States under 5506289, and its current status with California Secretary of State — bizfile Online is active. The company was incorporated on 12 February 2023 and lists its registered address as United States. 3 shareholders are on record for GT Biopharma, Inc., and since every one of them is a company rather than an individual, this particular filing does not on its own establish an ultimate beneficial owner (UBO) — identifying one would mean tracing the ownership of each shareholding company in turn. This profile is sourced directly from California Secretary of State — bizfile Online and was last updated on 21 October 2026.
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Shareholders
3
Three shareholders are currently on record for GT Biopharma, Inc., reflecting the stock ledger kept by the company under state corporate law (e.g. §219 of the Delaware General Corporation Law) rather than a public filing.
The largest of these is DRW Securities, LLC, holding 32.6% — the largest recorded stake — followed by Coston, McIsaac & Partners at 3.8%; the remaining 1 shareholder shown holds smaller stakes.
Because every shareholder shown is a company rather than an individual, the ownership chain continues above this level, and no beneficial owner can be established from this filing alone.
| Shareholder | Type | Holding | Source Document |
|---|---|---|---|
| DRW Securities, LLC | 32.6% | California Secretary of State — bizfile Online | |
| Coston, McIsaac & Partners | 3.8% | California Secretary of State — bizfile Online | |
| Verdence Capital Advisors LLC | 2.9% | California Secretary of State — bizfile Online |
Officers
5
The Interim Ceo & Executive Chairman of GT Biopharma, Inc. currently on record is Michael Martin Breen; five officers are currently on record for GT Biopharma, Inc., filed with California Secretary of State — bizfile Online.
The register reports 6 officers in total, including past appointments, though only the 5 most relevant records are shown here.
Management authority at GT Biopharma, Inc. sits with these individuals, not with shareholders, who are covered separately and hold ownership rather than control.
The source filing doesn't specify representation authority — whether officers can act individually or must sign jointly to bind the company — so that detail isn't available here.
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Frequently Asked Questions
Who owns GT Biopharma, Inc.?
Three shareholders are currently on record for GT Biopharma, Inc., reflecting the stock ledger kept by the company under state corporate law (e.g. §219 of the Delaware General Corporation Law) rather than a public filing. The largest of these is DRW Securities, LLC, holding 32.6% — the largest recorded stake — followed by Coston, McIsaac & Partners at 3.8%; the remaining 1 shareholder shown holds smaller stakes. Because every shareholder shown is a company rather than an individual, the ownership chain continues above this level, and no beneficial owner can be established from this filing alone.
Who is GT Biopharma, Inc.'s UBO (Ultimate Beneficial Owner)?
Every shareholder recorded for GT Biopharma, Inc. is itself a company rather than a natural person, so no Ultimate Beneficial Owner (UBO) is identified at this level; establishing one would require tracing the ownership of each shareholding company in turn.
How many shareholders does GT Biopharma, Inc. have on record?
3 shareholders are shown on record for GT Biopharma, Inc..
What is GT Biopharma, Inc.'s company registration number?
GT Biopharma, Inc.'s registration number is 5506289, filed with California Secretary of State — bizfile Online in United States. Its current status on the register is active.
Is GT Biopharma, Inc. still an active company?
GT Biopharma, Inc.'s status on California Secretary of State — bizfile Online is listed as active.
When was GT Biopharma, Inc. incorporated?
GT Biopharma, Inc. was incorporated on 12 February 2023, according to California Secretary of State — bizfile Online.
What is GT Biopharma, Inc.'s registered address?
The registered address on file for GT Biopharma, Inc. is United States.
Who are the officers/directors of GT Biopharma, Inc.?
The Interim Ceo & Executive Chairman of GT Biopharma, Inc. currently on record is Michael Martin Breen; five officers are currently on record for GT Biopharma, Inc., filed with California Secretary of State — bizfile Online. Management authority at GT Biopharma, Inc. sits with these individuals, not with shareholders, who are covered separately and hold ownership rather than control.
Can Zavia monitor changes to GT Biopharma, Inc.'s ownership over time?
This profile reflects a point-in-time snapshot from California Secretary of State — bizfile Online. Zavia's monitoring API can track changes to GT Biopharma, Inc.'s registered shareholders, officers, and group structure going forward, flagging updates as they're filed rather than requiring a manual recheck.
Can I access GT Biopharma, Inc.'s data through an API?
Yes. Zavia's API connects directly to official government ownership registries across 195 countries and territories, including United States, so records like GT Biopharma, Inc.'s registration, shareholder, UBO, and group-structure data can be queried programmatically instead of viewed one page at a time.
Where does this company information come from, and how current is it?
This record is sourced directly from California Secretary of State — bizfile Online and was last synced on 21 October 2026.