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SYBX Insider Trading

Insider Ownership Percentage: 2.62%
Insider Buying (Last 12 Months): $0.00
Insider Selling (Last 12 Months): $284.17

Synlogic Insider Trading History Chart

This chart shows the insider buying and selling history at Synlogic by year and by quarter.

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Synlogic Share Price & Price History

Current Price: $1.10
Price Change: ▲ Price Increase of +0.02 (1.85%)
As of 10/16/2026 03:13 PM ET

This chart shows the closing price history over time for SYBX up to the past year.

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Days: 30 | 90 | 365

Synlogic Insider Trading History

Transaction DateInsider NameTitleBuy/SellNumber of SharesAverage Share PriceTotal TransactionShares Held After TransactionDetails
10/29/2025Mary Beth DooleyInsiderSell157$1.81$284.1712,744View SEC Filing Icon  
2/3/2025Mary Beth DooleyInsiderSell2,107$1.33$2,802.3113,045View SEC Filing Icon  
10/29/2024Mary Beth DooleyInsiderSell79$1.40$110.6015,152View SEC Filing Icon  
4/2/2024Antoine AwadCOOSell372$1.73$643.5633,859View SEC Filing Icon  
4/2/2024Mary Beth DooleyInsiderSell188$1.73$325.2415,231View SEC Filing Icon  
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SEC Filings (Institutional Ownership Changes) for Synlogic (NASDAQ:SYBX)

63.40% of Synlogic stock is owned by institutions. Institutional ownership can be a sign of analyst confidence in the fundamentals of the stock.

Institutional Buying and Selling by Quarter

This chart shows the instiutional buying and selling at SYBX by year and by quarter.

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Synlogic Institutional Trading History

Reporting DateHedge FundShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
2/12/2026DRW Securities LLC24,363$27K0.0%N/A0.208%Search for SEC Filing on Google Icon
2/12/2026Renaissance Technologies LLC85,627$96K0.0%+116.7%0.732%Search for SEC Filing on Google Icon
11/17/2025Citadel Advisors LLC29,011$49K0.0%N/A0.248%Search for SEC Filing on Google Icon
2/13/2025Renaissance Technologies LLC22,310$31K0.0%-69.0%0.191%Search for SEC Filing on Google Icon
11/13/2024FMR LLC166,724$0.25M0.0%-27.6%1.425%Search for SEC Filing on Google Icon
8/9/2024Renaissance Technologies LLC100,530$0.15M0.0%-15.1%0.859%Search for SEC Filing on Google Icon
2/13/2024Armistice Capital LLC1,055,000$4.06M0.1%+75.9%11.480%Search for SEC Filing on Google Icon
1/8/2024Harbor Capital Advisors Inc.30,685$0.12M0.0%+43.4%0.334%Search for SEC Filing on Google Icon
11/15/2023Armistice Capital LLC599,874$1.69M0.0%N/A13.098%Search for SEC Filing on Google Icon
11/13/2023WINTON GROUP Ltd12,401$35K0.0%N/A0.271%Search for SEC Filing on Google Icon
10/20/2023Harbor Capital Advisors Inc.21,403$60K0.0%-92.6%0.467%Search for SEC Filing on Google Icon
7/31/2023PVG Asset Management Corp68,455$29K0.1%-31.7%0.100%Search for SEC Filing on Google Icon
7/11/2023Harbor Capital Advisors Inc.290,605$0.13M0.0%+10.1%0.426%Search for SEC Filing on Google Icon
4/26/2023Harbor Capital Advisors Inc.264,026$0.17M0.0%-15.3%0.387%Search for SEC Filing on Google Icon
1/13/2023Flagship Harbor Advisors LLC40,000$30K0.0%-28.6%0.057%Search for SEC Filing on Google Icon
11/14/2022RA Capital Management L.P.4,618,415$4.39M0.1%-20.7%6.576%Search for SEC Filing on Google Icon
11/14/2022UBS Oconnor LLC465,741$0.44M0.0%-14.2%0.663%Search for SEC Filing on Google Icon
10/28/2022Harbor Capital Advisors Inc.318,309$0.30M0.3%-10.0%0.453%Search for SEC Filing on Google Icon
8/12/2022Ikarian Capital LLC474,360$0.55M0.1%-8.7%0.675%Search for SEC Filing on Google Icon
8/4/2022Royce & Associates LP434,041$0.50M0.0%-10.3%0.618%Search for SEC Filing on Google Icon
Data available starting January 2016

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Synlogic logo
Synlogic, Inc., a clinical-stage biopharmaceutical company, engages in the discovery and development of synthetic biotics to treat metabolic diseases in the United States. Its pipeline include SYNB1618, an orally administered, non-systemically absorbed drug candidate to treat phenylketonuria; SYNB1934, an orally administered, non-systemically absorbed drug candidate, which is in Phase III clinical trial to treat phenylketonuria; SYNB1353, an orally administered, non-systemically absorbed drug candidate, which is in Phase I clinical to treat homocystinuria; SYNB8802, an orally administered, non-systemically absorbed drug candidate that is in Phase II clinical trial for the treatment of enteric hyperoxaluria; and SYNB2081 to lower uric acid for the potential treatment of gout. The company has a collaboration agreement with F. Hoffmann-La Roche Ltd and Hoffmann-La Roche Inc. for the research and pre-clinical development of a synthetic biotic medicine for the treatment of inflammatory bowel disease; and Ginkgo Bioworks, Inc. Synlogic, Inc. is based in Cambridge, Massachusetts.
Read More on Synlogic

Today's Range

Now: $1.10
Low: $1.00
High: $1.10

50 Day Range

MA: $1.16
Low: $1.02
High: $1.23

52 Week Range

Now: $1.10
Low: $0.54
High: $1.87

Volume

807 shs

Average Volume

66,151 shs

Market Capitalization

$13.47 million

P/E Ratio

N/A

Dividend Yield

N/A

Beta

0.61

Who are the company insiders with the largest holdings of Synlogic?

Synlogic's top insider investors include:
  1. Pfizer Inc (Major Shareholder)
  2. Antoine Awad (COO)
  3. Aoife Brennan (Insider)
  4. Mary Beth Dooley (Insider)
  5. Michael Vangsted Jensen (CFO)
  6. Jon Irvin (VP)
  7. Richard P Shea (Director)
  8. Michael Powell (Director)
  9. Paul Francis Miller (Insider)
Learn More about top insider investors at Synlogic.

Synlogic Active Insiders

Mary Beth Dooley
Mary Beth Dooley (Age 44)
Insider