Synlogic, Inc. (SYBX) Ownership
SYBX ownership summary
as of October 21, 2026- Institutions
- 57.6% of shares outstanding
- Insiders
- 15.65% of shares outstanding
- Shares outstanding
- 12.2M
- Float
- 4.0M shares available to trade
- Short interest
- 0.15% 10K shares short
- Days to cover
- 0.29 short interest up 9.7% vs prior month
- Institutions 57.55%
- Insiders 15.65%
- Other investors 26.80%
SYBX top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | DRW Securities, LLC | 0.20% | 24K | $25,664 | −600 (−2.5%) | March 31, 2026 |
| 2 | State Street Corp | 0.00% | — | — | −10,176 (−100.0%) | March 31, 2026 |
| 3 | Ikarian Capital, LLC | 0.00% | — | — | −19,966 (−100.0%) | March 31, 2026 |
| 4 | Susquehanna International Group, LLP | 0.00% | — | — | −11,623 (−100.0%) | March 31, 2026 |
| 5 | BlackRock Inc | 0.00% | — | — | −19,757 (−100.0%) | March 31, 2026 |
| 6 | Jane Street Group LLC | 0.00% | — | — | −14,998 (−100.0%) | March 31, 2026 |
| 7 | Northern Trust Corp | 0.00% | — | — | −19,469 (−100.0%) | March 31, 2026 |
| 8 | FMR Inc | 0.00% | — | — | −5,323 (−100.0%) | March 31, 2026 |
| 9 | FLAGSHIP HARBOR ADVISORS, LLC | 0.00% | — | — | −1,033 (−100.0%) | March 31, 2026 |
| 10 | Citigroup Inc | 0.00% | — | — | −1 (−100.0%) | March 31, 2026 |
| 11 | Citadel Advisors Llc | 0.00% | — | — | −141,608 (−100.0%) | March 31, 2026 |
| 12 | UBS Group AG | 0.00% | — | — | −2,531 (−100.0%) | March 31, 2026 |
| 13 | Danske Bank A/S. | 0.00% | — | — | −1 (−100.0%) | March 31, 2026 |
| 14 | Renaissance Technologies Corp | 0.00% | — | — | −85,627 (−100.0%) | March 31, 2026 |
| 15 | BNP Paribas Arbitrage, SA | 0.00% | — | — | −24 (−100.0%) | March 31, 2026 |
| 16 | Morgan Stanley - Brokerage Accounts | 0.00% | — | — | −1,095 (−100.0%) | March 31, 2026 |
| 17 | Geode Capital Management, LLC | 0.00% | — | — | −71,645 (−100.0%) | March 31, 2026 |
| 18 | JPMorgan Chase & Co | 0.00% | — | — | −1 (−100.0%) | March 31, 2026 |
| 19 | Cable Car Capital LLC | 0.00% | — | — | −3.3M (−100.0%) | March 31, 2026 |
| 20 | NEA Management Company, LLC | 0.00% | — | — | −2.9M (−100.0%) | March 31, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 0 holders added 0 shares and 20 cut 6.6M.
SYBX top mutual fund and ETF holders
3 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Pacific Select Large-Cap Growth I | 0.04% | 5,323 | $5,749 | — | August 31, 2026 |
| 2 | Extended Equity Market Fund B | 0.02% | 2,557 | $2,762 | — | December 31, 2025 |
| 3 | Extended Equity Market Fund E | 0.02% | 2,557 | $2,762 | — | December 31, 2025 |
Funds report holdings monthly or quarterly; dates differ by fund.
SYBX insider transactions
latest 1| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2025-10-29 | Mary Beth Dooley | Sell | $1.81 | 157 | $284 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
SYBX shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns SYBX
Institutional investors own 57.6% of Synlogic's shares and insiders 15.65%. The largest holder is DRW Securities, LLC with 0.20% of the shares (24K), as of March 31, 2026. Among the top 20 institutions, 0 added shares and 20 reduced their stake in the latest filings. Short interest is 0.15% of the float, or 0.29 days of average trading volume. The share count rose 10,766.6% since 2014.
Related: SYBX analyst forecast, SYBX key metrics. See the SYBX stock overview for the latest quote and news.
SYBX ownership FAQ
Who owns the most Synlogic stock?
The largest shareholders of Synlogic are DRW Securities, LLC (0.20%), State Street Corp (0.00%), Ikarian Capital, LLC (0.00%), Susquehanna International Group, LLP (0.00%), BlackRock Inc (0.00%).
What percentage of Synlogic is owned by institutions?
Institutions hold 57.6% of Synlogic's shares outstanding; insiders hold 15.65%.
Which funds own Synlogic?
The largest fund holders of Synlogic are Pacific Select Large-Cap Growth I (0.04%), Extended Equity Market Fund B (0.02%), Extended Equity Market Fund E (0.02%).
What is Synlogic's short interest?
10K shares of Synlogic were sold short, 0.15% of the float; at the average daily volume it would take 0.29 days to cover.
Are insiders buying or selling Synlogic?
Of the latest 1 reported insider transactions in Synlogic (since October 29, 2025), 0 were purchases and 1 were sales.
How many shares of Synlogic are outstanding?
Synlogic has 12.2M shares outstanding, of which 4.0M are in the public float.