Protagenic TherapeuticsPTIX
13F holders, Q4 2025 (December 31)12holders +1
4new positions
3sold out
1famous investor
$1.30avg. 13F price*
At the end of Q4 2025, 12 institutions reported holding Protagenic Therapeutics Inc. (PTIX) in their 13F filings, up 1 from Q3 2025. 4 opened new positions and 3 sold out. The largest holders were DRW Securities, LLC ($56K), FNY Investment Advisers, LLC ($32K) and Citadel Advisors ($30K). One famous investor held it Ken Griffin (0.0% of Citadel Advisors's portfolio).
- Company
- Protagenic Therapeutics Inc.
- CUSIP
- 74365N301
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q3 2025 → Q4 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 4 | $59K |
| Exits | 3 | $104K |
All 13F filers, Q3 2025 → Q4 2025: 61,500 shares bought and 45,432 shares sold, net +16,068 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 12 holders
| DRW Securities, LLC | 0.00% | Add +18.4% | 42,854 | $56K |
| FNY Investment Advisers, LLC | 0.01% | Add +42.9% | 25,000 | $32K |
| Citadel Advisors | 0.00% | New | 23,311 | $30K |
| Geode Capital Management, LLC | 0.00% | New | 12,182 | $16K |
| Raymond James Financial Inc. | 0.00% | New | 10,001 | $13K |
| Tower Research Capital LLC (TRC) | 0.00% | Add +145.2% | 3,045 | $4K |
| Osaic Holdings, Inc. | 0.00% | New | 49 | $64 |
| Bank of America Corp. | 0.00% | Add +112.5% | 17 | $22 |
| United Financial Planning Group LLC | 0.00% | No change | 17 | $22 |
| Morgan Stanley | 0.00% | Reduce -100.0% | 2 | $2 |
| Harbor Investment Advisory, LLC | 0.00% | No change | 1 | $1 |
| Cwm, LLC | 0.00% | No change | 1 | $0 |
"% of holder's portfolio" is PTIX's weight in each manager's 13F, not the share of Protagenic Therapeutics Inc. the manager owns.