United States Biotechnology & Medical Research

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Synlogic Inc (SYBX)

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Ticker: SYBX Exchange: NMS

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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Activity signal Earnings

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Company data & Insiders

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Trades

Dooley Mary Beth

See Remarks below

1 sale — total 284 USD

Sale 29 Oct 2025

Value US$3,382,866.48 | Price 491.19 | Shares 76,594

Dooley Mary Beth

See Remarks below

1 sale — total 173 USD

Sale 2 Apr 2025

Value US$4,489,002.28 | Price 497.91 | Shares 69,430

Dooley Mary Beth

See Remarks below

1 sale — total 2,802 USD

Sale 3 Feb 2025

Value US$2,802.31 | Price 1.33 | Shares 2,107

Dooley Mary Beth

Head of Finance

1 sale — total 111 USD

Sale 29 Oct 2024

Value US$110.60 | Price 1.40 | Shares 79

Brennan Aoife

Affiliate

1 sale — total 161,576 USD

Proposed sale 19 Apr 2024

Value US$161,576.00 | Price 1.83 | Shares 88,293

Dooley Mary Beth

Head of Finance

1 sale — total 325 USD

Sale 2 Apr 2024

Value US$325.24 | Price 1.73 | Shares 188

Awad Antoine

Chief Operating Officer

1 sale — total 644 USD

Sale 2 Apr 2024

Value US$643.56 | Price 1.73 | Shares 372

Brennan Aoife

Affiliate

1 sale — total 11,881 USD

Proposed sale 21 Mar 2024

Value US$11,881.00 | Price 1.73 | Shares 6,868

Awad Antoine

Chief Operating Officer

1 sale — total 3,707 USD

Sale 3 Apr 2023

Value US$3,707.00 | Price 0.58 | Shares 6,438

Brennan Aoife

See Remarks

1 sale — total 10,964 USD

Planned sale 3 Apr 2023

Value US$10,964.38 | Price 0.58 | Shares 19,042

JENSEN MICHAEL VANGSTED

Chief Financial Officer

1 sale — total 1,470 USD

Planned sale 3 Apr 2023

Value US$1,470.02 | Price 0.58 | Shares 2,553

JENSEN MICHAEL VANGSTED

Chief Financial Officer

1 purchase — total 10,640 USD

Buy 24 May 2022

Value US$10,640.00 | Price 1.12 | Shares 9,500

Awad Antoine

Chief Operating Officer

1 sale — total 6,482 USD

Planned sale 4 Apr 2022

Value US$6,481.64 | Price 2.45 | Shares 2,650

Brennan Aoife

See Remarks

1 sale — total 21,754 USD

Planned sale 4 Apr 2022

Value US$21,753.83 | Price 2.45 | Shares 8,894

Shea Richard P

1 purchase — total 20,550 USD

Buy 13 Dec 2019

Value US$20,550.00 | Price 2.74 | Shares 7,500

Miller Paul Francis

Chief Scientific Officer

1 sale — total 57,028 USD

Planned sale 13 Feb 2019

Value US$57,027.75 | Price 9.75 | Shares 5,849

Miller Paul Francis

Chief Scientific Officer

1 sale — total 30,722 USD

Planned sale 12 Feb 2019

Value US$30,722.25 | Price 9.75 | Shares 3,151

Miller Paul Francis

Chief Scientific Officer

1 sale — total 29,296 USD

Planned sale 18 Oct 2018

Value US$29,295.90 | Price 9.77 | Shares 3,000

Miller Paul Francis

Chief Scientific Officer

1 sale — total 39,163 USD

Planned sale 18 Sep 2018

Value US$39,162.90 | Price 13.05 | Shares 3,000

Miller Paul Francis

Chief Scientific Officer

1 sale — total 37,635 USD

Planned sale 5 Sep 2018

Value US$37,635.30 | Price 12.55 | Shares 3,000

Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other

Notification date	Transaction date	B/S Transaction type	Insider and/or position	Nb. shares Price Value	Number of shares	Price	Value
2025-10-31	2025-10-29	S Sale	3.7 Dooley Mary Beth See Remarks below Officer	76,594 +46.9% 491.19 US$3,382,866	76,594 +46.9%	491.19	US$3,382,866
2025-04-03	2025-04-02	S Sale	3.7 Dooley Mary Beth See Remarks below Officer	69,430 -5.0% 497.91 US$4,489,002	69,430 -5.0%	497.91	US$4,489,002
2025-02-04	2025-02-03	S Sale	3.7 Dooley Mary Beth See Remarks below Officer	37,667 +25.9% 311.00 US$2,849,106	37,667 +25.9%	311.00	US$2,849,106
2024-10-30	2024-10-29	S Sale	3.7 Dooley Mary Beth Head of Finance Officer	79 -0.5% 1.40 US$111	79 -0.5%	1.40	US$111
2024-04-22	2024-04-19	PrS Proposed sale	Brennan Aoife Affiliate	88,293 1.83 US$161,576	88,293	1.83	US$161,576
2024-04-04	2024-04-02	S Sale	3.7 Dooley Mary Beth Head of Finance Officer	188 -1.2% 1.73 US$325	188 -1.2%	1.73	US$325
2024-04-04	2024-04-02	S Sale	2.1 Awad Antoine Chief Operating Officer Officer	372 -1.1% 1.73 US$644	372 -1.1%	1.73	US$644
2024-03-21	2024-03-21	PrS Proposed sale	Brennan Aoife Affiliate	6,868 1.73 US$11,881	6,868	1.73	US$11,881
2023-04-05	2023-04-03	S Sale	2.1 Awad Antoine Chief Operating Officer Officer	6,438 -7.9% 0.58 US$3,707	6,438 -7.9%	0.58	US$3,707
2023-04-05	2023-04-03	PlS Planned sale	Brennan Aoife See Remarks Executive Director	19,042 -6.9% 0.58 US$10,964	19,042 -6.9%	0.58	US$10,964
2023-04-05	2023-04-03	PlS Planned sale	JENSEN MICHAEL VANGSTED Chief Financial Officer Officer	2,553 -5.2% 0.58 US$1,470	2,553 -5.2%	0.58	US$1,470
2022-05-25	2022-05-24	B Purchase	JENSEN MICHAEL VANGSTED Chief Financial Officer Officer	9,500 +31.7% 1.12 US$10,640	9,500 +31.7%	1.12	US$10,640
2022-04-06	2022-04-04	PlS Planned sale	2.1 Awad Antoine Chief Operating Officer Officer	2,650 -3.2% 2.45 US$6,482	2,650 -3.2%	2.45	US$6,482
2022-04-06	2022-04-04	PlS Planned sale	Brennan Aoife See Remarks Executive Director	8,894 -3.1% 2.45 US$21,754	8,894 -3.1%	2.45	US$21,754
2019-12-16	2019-12-13	B Purchase	Shea Richard P Non-Executive Director	7,500 +inf% 2.74 US$20,550	7,500 +inf%	2.74	US$20,550
2019-02-14	2019-02-13	PlS Planned sale	Miller Paul Francis Chief Scientific Officer Officer	5,849 -10.8% 9.75 US$57,028	5,849 -10.8%	9.75	US$57,028
2019-02-14	2019-02-12	PlS Planned sale	Miller Paul Francis Chief Scientific Officer Officer	3,151 -5.5% 9.75 US$30,722	3,151 -5.5%	9.75	US$30,722
2018-10-19	2018-10-18	PlS Planned sale	Miller Paul Francis Chief Scientific Officer Officer	3,000 -5.0% 9.77 US$29,296	3,000 -5.0%	9.77	US$29,296
2018-09-19	2018-09-18	PlS Planned sale	Miller Paul Francis Chief Scientific Officer Officer	3,000 -4.8% 13.05 US$39,163	3,000 -4.8%	13.05	US$39,163
2018-09-07	2018-09-05	PlS Planned sale	Miller Paul Francis Chief Scientific Officer Officer	3,000 -4.5% 12.55 US$37,635	3,000 -4.5%	12.55	US$37,635