United States Biotechnology & Medical Research

Synlogic Inc (SYBX)

Track

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
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
Sale 2 Apr 2025
Value US$4,489,002.28 | Price 497.91 | Shares 69,430
Sale 3 Feb 2025
Value US$2,802.31 | Price 1.33 | Shares 2,107
Sale 29 Oct 2024
Value US$110.60 | Price 1.40 | Shares 79
Proposed sale 19 Apr 2024
Value US$161,576.00 | Price 1.83 | Shares 88,293
Sale 2 Apr 2024
Value US$325.24 | Price 1.73 | Shares 188
Sale 2 Apr 2024
Value US$643.56 | Price 1.73 | Shares 372
Proposed sale 21 Mar 2024
Value US$11,881.00 | Price 1.73 | Shares 6,868
Sale 3 Apr 2023
Value US$3,707.00 | Price 0.58 | Shares 6,438
Planned sale 3 Apr 2023
Value US$10,964.38 | Price 0.58 | Shares 19,042
Planned sale 3 Apr 2023
Value US$1,470.02 | Price 0.58 | Shares 2,553
Buy 24 May 2022
Value US$10,640.00 | Price 1.12 | Shares 9,500
Planned sale 4 Apr 2022
Value US$6,481.64 | Price 2.45 | Shares 2,650
Planned sale 4 Apr 2022
Value US$21,753.83 | Price 2.45 | Shares 8,894
Buy 13 Dec 2019
Value US$20,550.00 | Price 2.74 | Shares 7,500
Planned sale 13 Feb 2019
Value US$57,027.75 | Price 9.75 | Shares 5,849
Planned sale 12 Feb 2019
Value US$30,722.25 | Price 9.75 | Shares 3,151
Planned sale 18 Oct 2018
Value US$29,295.90 | Price 9.77 | Shares 3,000
Planned sale 18 Sep 2018
Value US$39,162.90 | Price 13.05 | Shares 3,000
Planned sale 5 Sep 2018
Value US$37,635.30 | Price 12.55 | Shares 3,000
Planned sale 30 Aug 2018
Value US$13,091.88 | Price 9.76 | Shares 1,342
Planned sale 29 Aug 2018
Value US$16,198.33 | Price 9.77 | Shares 1,658
Planned sale 18 Jul 2018
Value US$33,021.90 | Price 11.01 | Shares 3,000
Planned sale 20 Jun 2018
Value US$9,750.00 | Price 9.75 | Shares 1,000
Planned sale 20 Jun 2018
Value US$10,329.20 | Price 9.80 | Shares 1,054
Planned sale 19 Jun 2018
Value US$9,223.50 | Price 9.75 | Shares 946
Planned sale 11 Nov 2016
Value US$217.50 | Price 1.45 | Shares 150
Planned sale 1 Nov 2016
Value US$359.49 | Price 1.28 | Shares 280
Planned sale 11 Oct 2016
Value US$273.75 | Price 1.83 | Shares 150
Planned sale 3 Oct 2016
Value US$481.35 | Price 1.93 | Shares 250
Buy 6 Oct 2015
Value US$4,999,995.00 | Price 7.00 | Shares 714,285
Buy 6 Oct 2015
Value US$5,999,994.00 | Price 7.00 | Shares 857,142
Buy 6 Oct 2015
Value US$5,999,994.00 | Price 7.00 | Shares 857,142
Buy 6 Oct 2015
Value US$5,999,994.00 | Price 7.00 | Shares 857,142
Buy 6 Oct 2015
Value US$5,999,994.00 | Price 7.00 | Shares 857,142
Buy 6 Oct 2015
Value US$5,999,994.00 | Price 7.00 | Shares 857,142
Buy 6 Oct 2015
Value US$5,999,994.00 | Price 7.00 | Shares 857,142
Buy 6 Oct 2015
Value US$5,999,994.00 | Price 7.00 | Shares 857,142
Buy 6 Oct 2015
Value US$5,999,994.00 | Price 7.00 | Shares 857,142
Buy 6 Oct 2015
Value US$5,999,994.00 | Price 7.00 | Shares 857,142
Buy 6 Oct 2015
Value US$5,999,994.00 | Price 7.00 | Shares 857,142
Buy 6 Oct 2015
Value US$5,999,994.00 | Price 7.00 | Shares 857,142
Buy 6 Oct 2015
Value US$5,999,994.00 | Price 7.00 | Shares 857,142
Buy 6 Oct 2015
Value US$5,999,994.00 | Price 7.00 | Shares 857,142
Buy 6 Oct 2015
Value US$5,999,994.00 | Price 7.00 | Shares 857,142
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 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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