Synlogic, Inc.
SYBX- Exchange
- OTC
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001527599
No open-market purchases or sales by Synlogic, Inc. insiders were filed in the last 90 days; 1 institution reported holding it in 13F filings for Q2 2026, worth $16.7K in total; no superinvestor holds it.
Open-market trades, last 90 days
Open-market purchases (P) and sales (S) by Synlogic, Inc. insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.
- Open-market buys
- 0 filings
- Open-market sells
- 0 filings
- Insiders trading
- 0
- Net value
- $0
- Purchases minus sales
Insider roster
Directors, officers and 10% owners who have filed a Form 4 for Synlogic, Inc., current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.
| Name | Title | Last reported holding | Last filing | Filings, past year |
|---|---|---|---|---|
| Sandell Scott D | Director, 10% Owner | – | Aug 14, 2026 | 1 |
| New Enterprise Associates 14, L.P. | Director, 10% Owner | – | Aug 14, 2026 | 1 |
| NEA Partners 14, L.P. | Director, 10% Owner | – | Aug 14, 2026 | 1 |
| Nea 14 GP, Ltd | Director, 10% Owner | – | Aug 14, 2026 | 1 |
| Florence Anthony A. Jr. | Director, 10% Owner | – | Aug 14, 2026 | 1 |
| Makhzoumi Mohamad | Director, 10% Owner | – | Aug 14, 2026 | 1 |
| Dooley Mary Beth | See Remarks below | 12,744 | Oct 31, 2025 | 1 |
| Shea Richard P | Director | 15,506 | Apr 29, 2025 | 0 |
| Flynn James P | Director | 15,000 | Apr 29, 2025 | 0 |
| Awad Antoine | Chief Operating Officer | 33,859 | Apr 4, 2024 | 0 |
| Barrett Peter | Director | – | Jan 4, 2024 | 0 |
| Hurter Patricia N. | Director | – | Jan 4, 2024 | 0 |
| Brennan Aoife | President and CEO | 256,301 | Nov 14, 2023 | 0 |
| Jensen Michael Vangsted | Chief Financial Officer | 46,947 | Nov 14, 2023 | 0 |
| Mathers Edward T | Director | – | Jun 26, 2023 | 0 |
| Heffernan Michael Thomas | Director | – | Jun 26, 2023 | 0 |
| Leschly Nick | Director | – | Jun 26, 2023 | 0 |
| Burgess Michael F. | Director | – | Jun 26, 2023 | 0 |
| Kelly-Croswell Lisa | Director | – | Jun 26, 2023 | 0 |
| Beloff Gregg | See Remarks | – | Feb 1, 2022 | 0 |
Insider trades
Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Aug 14, 2026 (view filing)4:09 PM ET | Jul 27 | 18 daysLate | Sandell Scott D and 5 othersDirector, 10% Owner | PPurchase | +2.64M | – | – | –2.64M after | Derivative |
| Oct 31, 2025 (view filing) | Oct 29 | 2 days | Dooley Mary BethSee Remarks below | SSale | −157 | $1.81 | −$284.17 | −1.2%12.7K after | |
| Apr 3, 2025 (view filing) | Apr 2 | 1 day | Dooley Mary BethSee Remarks below | SSale | −144 | $1.20 | −$172.8 | −1.1%12.9K after | |
| Feb 4, 2025 (view filing) | Feb 3 | 1 day | Dooley Mary BethSee Remarks below | SSale | −2.11K | $1.33 | −$2.80K | −13.9%13.0K after | |
| Oct 30, 2024 (view filing) | Oct 29 | 1 day | Dooley Mary BethHead of Finance | SSale | −79 | $1.40 | −$110.6 | −0.5%15.2K after | |
| Apr 4, 2024 (view filing) | Apr 2 | 2 days | Dooley Mary BethHead of Finance | SSale | −188 | $1.73 | −$325.24 | −1.2%15.2K after | |
| Apr 4, 2024 (view filing) | Apr 2 | 2 days | Awad AntoineChief Operating Officer | SSale | −372 | $1.73 | −$643.56 | −1.1%33.9K after | |
| Apr 5, 2023 (view filing) | Apr 3 | 2 days | Awad AntoineChief Operating Officer | SSale | −6.44K | $0.58 | −$3.73K | −7.9%74.7K after | |
| Apr 5, 2023 (view filing) | Apr 3 | 2 days | Brennan AoifeSee Remarks | SSale | −19.0K | $0.58 | −$11.0K | −6.9%256.3K after | 10b5-1 |
| Apr 5, 2023 (view filing) | Apr 3 | 2 days | Jensen Michael VangstedChief Financial Officer | SSale | −2.55K | $0.58 | −$1.48K | −5.2%46.9K after | |
| May 25, 2022 (view filing) | May 24 | 1 day | Jensen Michael VangstedChief Financial Officer | PPurchase | +9.50K | $1.12 | +$10.6K | +31.7%39.5K after | |
| Apr 6, 2022 (view filing) | Apr 4 | 2 days | Brennan AoifeSee Remarks | SSale | −8.89K | $2.45 | −$21.8K | −3.1%275.3K after | |
| Apr 6, 2022 (view filing) | Apr 4 | 2 days | Awad AntoineChief Operating Officer | SSale | −2.65K | $2.45 | −$6.49K | −3.2%81.2K after |