Latest Period
Q4 2025
Security Snapshot
SYNLOGIC, INC. - Common Stock, par value $0.001 per share (SYBX) Institutional Ownership
CUSIP: 87166L209
13F Institutional Holders and Ownership History from Q3 2023 to Q1 2026
Institutions Reporting
25
Shares (Excl. Options)
6,879,879
Price
$1.12
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- Type / Class
- Equity / Common Stock, par value $0.001 per share
- Symbol
- SYBX on OTC
- Shares outstanding
- 11,703,954
- Price per share
- $0.60
- All holders as of 31 Dec 2025
- Q4 2025
- Total 13F shares
- 6,879,879
- Total reported value
- $7,705,466
- % of total 13F portfolios
- 0%
- Share change
- +224,586
- Value change
- +$251,520
- Number of holders
- 25
- Price from insider filings
- $0.60
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors
Quick Takeaways
- SYBX - SYNLOGIC, INC. - Common Stock, par value $0.001 per share is tracked under CUSIP 87166L209.
- 25 institutions reported positions in Q4 2025.
- 3 significant owners is listed from Schedule 13D/13G reporting.
What Changed
- Holder count moved from 25 to 1 between Q4 2025 and Q1 2026.
- Reported value moved from $7,705,466 to $12.
Why This Matters
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Source Evidence
Source: SEC Form 13F
Open SEC Evidence
Latest holder context comes from 25 institutions filings for Q4 2025.
Investment Quick Answers
What is CUSIP 87166L209?
CUSIP 87166L209 identifies SYBX - SYNLOGIC, INC. - Common Stock, par value $0.001 per share in SEC 13F datasets.
Where can I see the latest institutional holders?
Review the Q4 2025 holders report and the ownership history table below.
Continue With The Right Next Step
- Latest 13F filings - identify new institutional portfolio moves.
- Latest Schedule 13D/13G reports - cross-check beneficial ownership events.
- All institutional ownership pages - compare nearby CUSIPs and holder concentration.
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 87166L209:
Significant Owners of SYNLOGIC, INC. - Common Stock, par value $0.001 per share (SYBX) based on Schedule 13D/G filings
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| Funicular Funds, LP | 28% | $1,987,331 | 3,312,219 | Funicular Funds, LP | 02 Apr 2026 | |||
| Baselake Partners, LP | 9.7% | $1,265,400 | 1,140,000 | Baselake Partners, LP | 20 Jan 2026 | |||
| Radoff Bradley Louis | 4.4% | $894,400 | 520,000 | Radoff Bradley Louis | 30 Sep 2025 |
As of 31 Dec 2025, 25 institutional investors reported holding 6,879,879 shares of SYNLOGIC, INC. - Common Stock, par value $0.001 per share (SYBX). This represents 59% of the company’s total 11,703,954 outstanding shares.
Top 25 Institutional Shareholders
The largest institutional shareholders of SYNLOGIC, INC. - Common Stock, par value $0.001 per share (SYBX) together control 59% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| Cable Car Capital, LP | 28% | 3,312,219 | 0% | 0.23% | $3,709,685 |
| NEA Management Company, LLC | 25% | 2,922,772 | 0% | 0.17% | $3,273,505 |
| VANGUARD GROUP INC | 1.7% | 201,060 | +2.3% | 0% | $225,187 |
| CITADEL ADVISORS LLC | 1.2% | 141,608 | +388% | 0% | $158,601 |
| RENAISSANCE TECHNOLOGIES LLC | 0.73% | 85,627 | +117% | 0% | $95,902 |
| GEODE CAPITAL MANAGEMENT, LLC | 0.61% | 71,645 | +5.9% | 0% | $80,247 |
| DRW Securities, LLC | 0.21% | 24,363 | 0% | $27,286 | |
| Ikarian Capital, LLC | 0.17% | 19,966 | -2.2% | 0% | $22,362 |
| BlackRock, Inc. | 0.17% | 19,757 | 0% | 0% | $22,128 |
| NORTHERN TRUST CORP | 0.17% | 19,469 | 0% | 0% | $21,805 |
| JANE STREET GROUP, LLC | 0.13% | 14,998 | 0% | $16,797 | |
| XTX Topco Ltd | 0.12% | 14,398 | +29% | 0% | $16,126 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 0.1% | 11,623 | 0% | $13,018 | |
| STATE STREET CORP | 0.09% | 10,176 | 0% | 0% | $11,397 |
| FMR LLC | 0.05% | 5,323 | 0% | 0% | $5,962 |
| UBS Group AG | 0.02% | 2,531 | 0% | $2,835 | |
| MORGAN STANLEY | 0.01% | 1,095 | 0% | 0% | $1,226 |
| FLAGSHIP HARBOR ADVISORS, LLC | 0.01% | 1,033 | 0% | $1,157 | |
| SBI Securities Co., Ltd. | 0% | 103 | 0% | 0% | $115 |
| BANK OF AMERICA CORP /DE/ | 0% | 66 | +3.1% | 0% | $73 |
| BNP PARIBAS FINANCIAL MARKETS | 0% | 24 | 0% | 0% | $27 |
| Hilltop National Bank | 0% | 20 | 0% | 0% | $22 |
| CITIGROUP INC | 0% | 1 | 0% | 0% | $1 |
| DANSKE BANK A/S | 0% | 1 | 0% | 0% | $1 |
| JPMORGAN CHASE & CO | 0% | 1 | 0% | 0% | $1 |
Institutional Holders of SYNLOGIC, INC. - Common Stock, par value $0.001 per share (SYBX) across Reporting Periods
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 20 | $12 | $0.60 | 1 | |
| 2025 Q4 | 6,879,879 | $7,705,466 | +$251,520 | $1.12 | 25 |
| 2025 Q3 | 6,655,293 | $11,108,525 | -$178,424 | $1.69 | 23 |
| 2025 Q2 | 6,771,875 | $8,600,285 | -$10,063 | $1.27 | 19 |
| 2025 Q1 | 6,780,519 | $8,407,849 | +$20,324 | $1.24 | 18 |
| 2024 Q4 | 6,764,147 | $9,456,349 | -$88,239 | $1.39 | 17 |
| 2024 Q3 | 6,826,001 | $10,170,748 | -$168,603 | $1.49 | 16 |
| 2024 Q2 | 6,939,069 | $10,408,615 | +$22,340 | $1.50 | 17 |
| 2024 Q1 | 6,924,167 | $12,394,270 | +$1,589,732 | $1.79 | 16 |
| 2023 Q4 | 4,715,822 | $18,155,320 | -$1,046,769 | $3.85 | 23 |
| 2023 Q3 | 2,378,844 | $6,684,705 | +$6,627,246 | $2.81 | 25 |