GTBP
GT Biopharma, Inc.Company with tickers: GTBP
CIK
109657
CUSIP
36254L308
Shares Outstanding
36,062,904
13F Activity (30d)
28 filings
26 filers
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Holders: 42
Total Value: $658,159
Total Shares: 1,613,172
Institutional Ownership Trend
Holder Concentration
Across 42 13F filers · Δ vs Dec 31, 2025Top Holder
28.0%
+11.3 pts
Top 5
70.2%
+22.2 pts
Top 10
81.4%
+15.4 pts
HHI
1,410
Broadly held
+707
Quarterly Activity
vs Dec 31, 2025
New
15
Increased
7
Decreased
5
Sold Out
11
Unchanged
15
Holder count:
+4
Institutional value:
+73.6%
Shares held:
+234.0%
Top Buyers
vs Dec 31, 2025| Institution | Added | Now Holds | Open |
|---|---|---|---|
| Mega GEODE CAPITAL MANAGEMENT, LLC | +275,201 | 294,459 | |
| Mega UBS Group AG | +45,969 | 45,970 | |
| Mega LPL Financial LLC | +19,750 | 30,382 | |
| Small TWO SIGMA SECURITIES, LLC | +19,262 | 31,796 | |
| Large OSAIC HOLDINGS, INC. | +19,000 | 21,000 |
Top Sellers
vs Dec 31, 2025| Institution | Sold | Now Holds | Open |
|---|---|---|---|
| Mega CITADEL ADVISORS LLC | −14,596 | 66,165 | |
| Mega MORGAN STANLEY | −2,000 | 16,599 | |
| Mid Verdence Capital Advisors LLC | −1,000 | 12,000 | |
| Mid Tower Research Capital LLC (TRC) | −3 | 1,698 | |
| Mega BlackRock, Inc. | −1 | 8,408 |
Top New Positions
vs Dec 31, 2025| Institution | Acquired | Value (USD) | Open |
|---|---|---|---|
| Mega VANGUARD CAPITAL MANAGEMENT LLC | 451,875 | $184,365 | |
| Mega VANGUARD FIDUCIARY TRUST CO | 225,938 | $92,182 | |
| Mid Arax Advisory Partners | 93,627 | $38,199 | |
| Small Invst, LLC | 23,400 | $9,547 | |
| Small Keel Point, LLC | 20,768 | $8,473 |
Top Sold-Out Positions
vs Dec 31, 2025| Institution | Previously Held | Last Value (USD) | Open |
|---|---|---|---|
| Small Scientech Research LLC | 54,745 | $42,974 | |
| Mega JANE STREET GROUP, LLC | 26,016 | $20,421 | |
| Large HRT FINANCIAL LP | 11,767 | $9,237 | |
| Mega BANK OF MONTREAL /CAN/ | 10,834 | $8,504 | |
| Mid Advisory Services Network, LLC | 10,000 | $7,850 |
| Holder | Value (USD) | % of 13F | Shares | Type | Discretion | Filed | Open | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Mega VANGUARD CAPITAL MANAGEMENT LLC | $184,365 | 28.01% | 451,875 | Shares | Defined | 2026-05-15 | ||||
| Mega GEODE CAPITAL MANAGEMENT, LLC | $120,139 | 18.25% | 294,459 | Shares | Defined | 2026-05-15 | ||||
| Mega VANGUARD FIDUCIARY TRUST CO Bank | $92,182 | 14.01% | 225,938 | Shares | Defined | 2026-05-08 | ||||
| Mid Arax Advisory Partners | $38,199 | 5.80% | 93,627 | Shares | Sole | 2026-05-13 | ||||
| Mega CITADEL ADVISORS LLC | $26,995 | 4.10% | 66,165 | Shares | Defined | 2026-05-15 | ||||
| Small SeaCrest Wealth Management, LLC | $20,400 | 3.10% | 50,000 | Shares | Sole | 2026-04-15 | ||||
| Mega UBS Group AG | $18,754 | 2.85% | 45,970 | Shares | Defined | 2026-05-05 | ||||
| Small TWO SIGMA SECURITIES, LLC Broker-Dealer | $12,972 | 1.97% | 31,796 | Shares | Sole | 2026-05-15 | ||||
| Mega LPL Financial LLC | $12,395 | 1.88% | 30,382 | Shares | Sole | 2026-05-06 | ||||
| Small Invst, LLC | $9,547 | 1.45% | 23,400 | Shares | Sole | 2026-05-13 | ||||
| Large OSAIC HOLDINGS, INC. | $8,568 | 1.30% | 21,000 | Shares | Defined | 2026-05-15 | ||||
| Small Keel Point, LLC | $8,473 | 1.29% | 20,768 | Shares | Sole | 2026-06-01 | ||||
| Large Cerity Partners LLC | $8,169 | 1.24% | 20,023 | Shares | Other | 2026-05-15 | ||||
| Mid Integrated Wealth Concepts LLC | $8,162 | 1.24% | 20,006 | Shares | Sole | 2026-05-15 | ||||
| Micro Private Wealth Management Group, LLC | $8,160 | 1.24% | 20,000 | Shares | Sole | 2026-04-23 | ||||
| Small Coston, McIsaac & Partners | $6,973 | 1.06% | 17,092 | Shares | Sole | 2026-04-22 | ||||
| Mega MORGAN STANLEY | $6,772 | 1.03% | 16,599 | Shares | Defined | 2026-05-15 | ||||
| Micro Caitlin John, LLC | $6,732 | 1.02% | 16,500 | Shares | Sole | 2026-05-13 | ||||
| Mega WELLS FARGO & COMPANY/MN | $6,542 | 0.99% | 16,037 | Shares | Defined | 2026-05-11 | ||||
| Small AM INVESTMENT STRATEGIES LLC | $6,120 | 0.93% | 15,000 | Shares | Sole | 2026-04-29 | ||||
| Mid Virtu Financial LLC | $6,069 | 0.92% | 14,876 | Shares | Defined | 2026-05-14 | ||||
| Small StoneX Group Inc. | $6,020 | 0.91% | 14,756 | Shares | Defined | 2026-05-14 | ||||
| Mid Verdence Capital Advisors LLC | $4,896 | 0.74% | 12,000 | Shares | Sole | 2026-04-30 | ||||
| Mid Prospera Financial Services Inc | $4,894 | 0.74% | 11,996 | Shares | Sole | 2026-04-14 | ||||
| Small LaSalle St. Investment Advisors, LLC | $4,488 | 0.68% | 11,000 | Shares | Sole | 2026-05-08 | ||||
| Mid PARSONS CAPITAL MANAGEMENT INC/RI | $4,447 | 0.68% | 10,900 | Shares | Sole | 2026-04-15 | ||||
| Small HBK Sorce Advisory LLC | $4,080 | 0.62% | 10,000 | Shares | Sole | 2026-05-11 | ||||
| Mega BlackRock, Inc. | $3,430 | 0.52% | 8,408 | Shares | Sole | 2026-05-13 | ||||
| Mid Allworth Financial LP | $1,836 | 0.28% | 4,501 | Shares | Sole | 2026-05-15 | ||||
| Small NFSG Corp | $1,530 | 0.23% | 3,750 | Shares | Sole | 2026-05-05 | ||||
| Mid Farther Finance Advisors, LLC | $1,224 | 0.19% | 3,000 | Shares | Sole | 2026-04-07 | ||||
| Mid MassMutual Private Wealth & Trust, FSB | $1,224 | 0.19% | 3,000 | Shares | Sole | 2026-04-13 | ||||
| Micro West Financial Advisors, LLC | $1,020 | 0.15% | 2,500 | Shares | Sole | 2026-04-08 | ||||
| Mid Tower Research Capital LLC (TRC) | $692 | 0.11% | 1,698 | Shares | Defined | 2026-05-15 | ||||
| Small Triumph Capital Management | $675 | 0.10% | 1,655 | Shares | Sole | 2026-05-13 | ||||
| Micro Stone House Investment Management, LLC | $510 | 0.08% | 1,251 | Shares | Sole | 2026-04-22 | ||||
| Mega FMR LLC | $408 | 0.06% | 1,000 | Shares | Defined | 2026-05-15 | ||||
| Mega ROYAL BANK OF CANADA Bank | $51 | 0.01% | 126 | Shares | Defined | 2026-05-15 | ||||
| Small Hilltop National Bank Bank | $40 | 0.01% | 100 | Shares | Sole | 2026-04-02 | ||||
| Mega BNP PARIBAS ARBITRAGE, SA | $6 | 0.00% | 16 | Shares | Defined | 2026-05-12 | ||||
| Mid SBI Securities Co., Ltd. Broker-Dealer | $0 | 0.00% | 1 | Shares | Defined | 2026-04-28 | ||||
| Mega JPMORGAN CHASE & CO | $0 | 0.00% | 1 | Shares | Defined | 2026-05-13 | ||||
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