United States Biotechnology & Medical Research

Synlogic Inc (SYBX)

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Synlogic Inc. has seen no insider trading activity within the last ninety days. The most recent recorded transaction occurred on October 29, 2025, involving a sale of shares by Mary Beth Dooley. Historical data indicates a pattern of divestment by various corporate officers over several years.
Ticker: SYBX Exchange: NMS
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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Buy signal Sell signal Earnings
No insider activity signals detected

Insider trades have not triggered unusual activity signals for this company.

Top insiders
Trades
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
3.7
Dooley Mary Beth See Remarks below Officer
Transaction date
Sale
Price
491.19
Quantity 76,594 +46.9%
Value US$3,382,866
3.7
Dooley Mary Beth See Remarks below Officer
Transaction date
Sale
Price
497.91
Quantity 69,430 -5.0%
Value US$4,489,002
3.7
Dooley Mary Beth See Remarks below Officer
Transaction date
Sale
Price
311.00
Quantity 37,667 +25.9%
Value US$2,849,106
3.7
Dooley Mary Beth Head of Finance Officer
Transaction date
Sale
Price
1.40
Quantity 79 -0.5%
Value US$111
Brennan Aoife Affiliate
Transaction date
Proposed sale
Price
1.83
Quantity 88,293
Value US$161,576
3.7
Dooley Mary Beth Head of Finance Officer
Transaction date
Sale
Price
1.73
Quantity 188 -1.2%
Value US$325
2.1
Awad Antoine Chief Operating Officer Officer
Transaction date
Sale
Price
1.73
Quantity 372 -1.1%
Value US$644
Brennan Aoife Affiliate
Transaction date
Proposed sale
Price
1.73
Quantity 6,868
Value US$11,881
2.1
Awad Antoine Chief Operating Officer Officer
Transaction date
Sale
Price
0.58
Quantity 6,438 -7.9%
Value US$3,707
Brennan Aoife See Remarks Executive Director
Transaction date
Planned sale
Price
0.58
Quantity 19,042 -6.9%
Value US$10,964
JENSEN MICHAEL VANGSTED Chief Financial Officer Officer
Transaction date
Planned sale
Price
0.58
Quantity 2,553 -5.2%
Value US$1,470
JENSEN MICHAEL VANGSTED Chief Financial Officer Officer
Transaction date
Purchase
Price
1.12
Quantity 9,500 +31.7%
Value US$10,640
2.1
Awad Antoine Chief Operating Officer Officer
Transaction date
Planned sale
Price
2.45
Quantity 2,650 -3.2%
Value US$6,482
Brennan Aoife See Remarks Executive Director
Transaction date
Planned sale
Price
2.45
Quantity 8,894 -3.1%
Value US$21,754
Shea Richard P Non-Executive Director
Transaction date
Purchase
Price
2.74
Quantity 7,500 +inf%
Value US$20,550
Miller Paul Francis Chief Scientific Officer Officer
Transaction date
Planned sale
Price
9.75
Quantity 5,849 -10.8%
Value US$57,028
Miller Paul Francis Chief Scientific Officer Officer
Transaction date
Planned sale
Price
9.75
Quantity 3,151 -5.5%
Value US$30,722
Miller Paul Francis Chief Scientific Officer Officer
Transaction date
Planned sale
Price
9.77
Quantity 3,000 -5.0%
Value US$29,296
Miller Paul Francis Chief Scientific Officer Officer
Transaction date
Planned sale
Price
13.05
Quantity 3,000 -4.8%
Value US$39,163
Miller Paul Francis Chief Scientific Officer Officer
Transaction date
Planned sale
Price
12.55
Quantity 3,000 -4.5%
Value US$37,635
Miller Paul Francis Chief Scientific Officer Officer
Transaction date
Planned sale
Price
9.76
Quantity 1,342 -2.0%
Value US$13,092
Miller Paul Francis Chief Scientific Officer Officer
Transaction date
Planned sale
Price
9.77
Quantity 1,658 -2.4%
Value US$16,198
Miller Paul Francis Chief Scientific Officer Officer
Transaction date
Planned sale
Price
11.01
Quantity 3,000 -4.2%
Value US$33,022
Miller Paul Francis Chief Scientific Officer Officer
Transaction date
Planned sale
Price
9.75
Quantity 1,000 -1.4%
Value US$9,750
Miller Paul Francis Chief Scientific Officer Officer
Transaction date
Planned sale
Price
9.80
Quantity 1,054 -1.4%
Value US$10,329
Miller Paul Francis Chief Scientific Officer Officer
Transaction date
Planned sale
Price
9.75
Quantity 946 -1.3%
Value US$9,224
Irvin Jon Vice President, Finance Officer
Transaction date
Planned sale
Price
1.45
Quantity 150 -1.9%
Value US$218
Irvin Jon Vice President, Finance Officer
Transaction date
Planned sale
Price
1.28
Quantity 280 -3.4%
Value US$359
Irvin Jon Vice President, Finance Officer
Transaction date
Planned sale
Price
1.83
Quantity 150 -1.8%
Value US$274
Irvin Jon Vice President, Finance Officer
Transaction date
Planned sale
Price
1.93
Quantity 250 -2.9%
Value US$481
PFIZER INC Large shareholder
Transaction date
Purchase
Price
7.00
Quantity 714,285 +46.4%
Value US$4,999,995
Sofinnova Venture Partners VIII, L.P. Large shareholder
Transaction date
Purchase
Price
7.00
Quantity 857,142 +40.5%
Value US$5,999,994
BASKETT FOREST Large shareholder
Transaction date
Purchase
Price
7.00
Quantity 857,142 +40.5%
Value US$5,999,994
KOLLURI KRISHNA KITTU Large shareholder
Transaction date
Purchase
Price
7.00
Quantity 857,142 +40.5%
Value US$5,999,994
Viswanathan Ravi Large shareholder
Transaction date
Purchase
Price
7.00
Quantity 857,142 +40.5%
Value US$5,999,994
BARRIS PETER J Large shareholder
Transaction date
Purchase
Price
7.00
Quantity 857,142 +40.5%
Value US$5,999,994
POWELL MICHAEL Non-Executive Director Large shareholder
Transaction date
Purchase
Price
7.00
Quantity 857,142 +40.5%
Value US$5,999,994
Sonsini Peter W. Large shareholder
Transaction date
Purchase
Price
7.00
Quantity 857,142 +40.5%
Value US$5,999,994
Weller Harry R Large shareholder
Transaction date
Purchase
Price
7.00
Quantity 857,142 +40.5%
Value US$5,999,994
KERINS PATRICK J Large shareholder
Transaction date
Purchase
Price
7.00
Quantity 857,142 +40.5%
Value US$5,999,994
SANDELL SCOTT D Large shareholder
Transaction date
Purchase
Price
7.00
Quantity 857,142 +40.5%
Value US$5,999,994
New Enterprise Associates 14, L.P. Large shareholder
Transaction date
Purchase
Price
7.00
Quantity 857,142 +40.5%
Value US$5,999,994
MOTT DAVID M Large shareholder
Transaction date
Purchase
Price
7.00
Quantity 857,142 +40.5%
Value US$5,999,994
Florence Anthony A. Jr. Large shareholder
Transaction date
Purchase
Price
7.00
Quantity 857,142 +40.5%
Value US$5,999,994
BARRETT M JAMES Large shareholder
Transaction date
Purchase
Price
7.00
Quantity 857,142 +40.5%
Value US$5,999,994
Notification date Transaction date B/S Transaction type Insider and/or position Nb. shares
Price
Value 		Number of shares Price Value Details
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
2018-08-31 2018-08-30 PlS Planned sale Miller Paul Francis

Chief Scientific Officer

Officer
1,342 -2.0%
9.76
US$13,092 		1,342 -2.0% 9.76 US$13,092
2018-08-31 2018-08-29 PlS Planned sale Miller Paul Francis

Chief Scientific Officer

Officer
1,658 -2.4%
9.77
US$16,198 		1,658 -2.4% 9.77 US$16,198
2018-07-19 2018-07-18 PlS Planned sale Miller Paul Francis

Chief Scientific Officer

Officer
3,000 -4.2%
11.01
US$33,022 		3,000 -4.2% 11.01 US$33,022
2018-06-21 2018-06-20 PlS Planned sale Miller Paul Francis

Chief Scientific Officer

Officer
1,000 -1.4%
9.75
US$9,750 		1,000 -1.4% 9.75 US$9,750
2018-06-21 2018-06-20 PlS Planned sale Miller Paul Francis

Chief Scientific Officer

Officer
1,054 -1.4%
9.80
US$10,329 		1,054 -1.4% 9.80 US$10,329
2018-06-21 2018-06-19 PlS Planned sale Miller Paul Francis

Chief Scientific Officer

Officer
946 -1.3%
9.75
US$9,224 		946 -1.3% 9.75 US$9,224
2016-11-15 2016-11-11 PlS Planned sale Irvin Jon

Vice President, Finance

Officer
150 -1.9%
1.45
US$218 		150 -1.9% 1.45 US$218
2016-11-02 2016-11-01 PlS Planned sale
Irvin Jon

Vice President, Finance

Officer
280 -3.4%
1.28
US$359 		280 -3.4% 1.28 US$359
2016-10-12 2016-10-11 PlS Planned sale Irvin Jon

Vice President, Finance

Officer
150 -1.8%
1.83
US$274 		150 -1.8% 1.83 US$274
2016-10-05 2016-10-03 PlS Planned sale
Irvin Jon

Vice President, Finance

Officer
250 -2.9%
1.93
US$481 		250 -2.9% 1.93 US$481
2015-10-07 2015-10-06 B Purchase PFIZER INC Large shareholder
714,285 +46.4%
7.00
US$4,999,995 		714,285 +46.4% 7.00 US$4,999,995
2015-10-06 2015-10-06 B Purchase Sofinnova Venture Partners VIII, L.P. Large shareholder
857,142 +40.5%
7.00
US$5,999,994 		857,142 +40.5% 7.00 US$5,999,994
2015-10-06 2015-10-06 B Purchase BASKETT FOREST Large shareholder
857,142 +40.5%
7.00
US$5,999,994 		857,142 +40.5% 7.00 US$5,999,994
2015-10-06 2015-10-06 B Purchase KOLLURI KRISHNA KITTU Large shareholder
857,142 +40.5%
7.00
US$5,999,994 		857,142 +40.5% 7.00 US$5,999,994
2015-10-06 2015-10-06 B Purchase Viswanathan Ravi Large shareholder
857,142 +40.5%
7.00
US$5,999,994 		857,142 +40.5% 7.00 US$5,999,994
2015-10-06 2015-10-06 B Purchase BARRIS PETER J Large shareholder
857,142 +40.5%
7.00
US$5,999,994 		857,142 +40.5% 7.00 US$5,999,994
2015-10-06 2015-10-06 B Purchase POWELL MICHAEL Non-Executive Director Large shareholder
857,142 +40.5%
7.00
US$5,999,994 		857,142 +40.5% 7.00 US$5,999,994
2015-10-06 2015-10-06 B Purchase Sonsini Peter W. Large shareholder
857,142 +40.5%
7.00
US$5,999,994 		857,142 +40.5% 7.00 US$5,999,994
2015-10-06 2015-10-06 B Purchase Weller Harry R Large shareholder
857,142 +40.5%
7.00
US$5,999,994 		857,142 +40.5% 7.00 US$5,999,994
2015-10-06 2015-10-06 B Purchase KERINS PATRICK J Large shareholder
857,142 +40.5%
7.00
US$5,999,994 		857,142 +40.5% 7.00 US$5,999,994
2015-10-06 2015-10-06 B Purchase SANDELL SCOTT D Large shareholder
857,142 +40.5%
7.00
US$5,999,994 		857,142 +40.5% 7.00 US$5,999,994
2015-10-06 2015-10-06 B Purchase New Enterprise Associates 14, L.P. Large shareholder
857,142 +40.5%
7.00
US$5,999,994 		857,142 +40.5% 7.00 US$5,999,994
2015-10-06 2015-10-06 B Purchase MOTT DAVID M Large shareholder
857,142 +40.5%
7.00
US$5,999,994 		857,142 +40.5% 7.00 US$5,999,994
2015-10-06 2015-10-06 B Purchase Florence Anthony A. Jr. Large shareholder
857,142 +40.5%
7.00
US$5,999,994 		857,142 +40.5% 7.00 US$5,999,994
2015-10-06 2015-10-06 B Purchase BARRETT M JAMES Large shareholder
857,142 +40.5%
7.00
US$5,999,994 		857,142 +40.5% 7.00 US$5,999,994
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