Quick Takeaways
- SYBX - SYNLOGIC, INC. has 16 insiders with reported activity on this page.
- Net insider value flow over the last year: -$284.
- Recent transaction rows are available for direct filing-level review.
Insider Transactions Reported by 16 Insiders of SYNLOGIC, INC.
- Symbol
- SYBX on OTC
- Location
- Winchester, MA
What Changed
- Buy value: ; sell value: $284.
- Net share flow: -157.
Why This Matters
- This page gives a plain-language issuer insider context before you inspect transaction-level evidence.
- Use the filing links below to verify timestamps, codes, and ownership impacts directly from SEC forms.
Source Evidence
Filed on Form 4
See Original Filing
Issuer insider activity is sourced from SEC Forms 3, 4, and 5.
Insider trading overview
Last 12 monthsNet insider flow leans to selling over the last 12 months. Net value: -$284.
Buys
$0
Shares: 0
Insiders: 0
Sells
$284
Shares: 157
Insiders: 1
Net
-$284
Shares: -157
Insiders: -1
| Window (months) | Buy shares | Sell shares | Buy $ | Sell $ | Net $ |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 157 | $0 | $284 | -$284 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
SYNLOGIC, INC. executives and other stock owners filed with the SEC include:
Top shareholders of SYNLOGIC, INC. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.
Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
| Holder | Source | Role / Reporting | Ownership % | Shares | Holdings Value | 12M Net Δ | As of | Details |
|---|---|---|---|---|---|---|---|---|
| Funicular Funds, LP |
13D/G
3/4/5
|
10%+ Owner |
28%
|
3,312,219
|
$1,987,331 | $0 | 02 Apr 2026 | |
| New Enterprise Associates 14, L.P. |
3/4/5
|
10%+ Owner |
—
class O/S missing
|
2,922,773
|
$1,682,933 | — | 03 Oct 2023 | |
| Baselake Partners, LP |
13D/G
|
— |
9.7%
|
1,140,000
|
$1,265,400 | $0 | 20 Jan 2026 | |
| Bradley Louis Radoff |
13D/G
|
Radoff Bradley Louis |
4.4%
|
520,000
|
$894,400 | $0 | 30 Sep 2025 | |
| John A. Kryzanowski |
13D/G
|
Kryzanowski, John A. |
6.3%
|
733,412
|
$249,360 | $0 | 31 Dec 2024 | |
| Aoife Brennan |
3/4/5
|
President and CEO, Director |
—
mixed-class rows
|
264,967
mixed-class rows
|
$147,578 | — | 10 Nov 2023 | |
| Antoine Awad |
3/4/5
|
Chief Operating Officer |
—
mixed-class rows
|
50,525
mixed-class rows
|
$58,576 | — | 02 Apr 2024 | |
| Michael Vangsted Jensen |
3/4/5
|
Chief Financial Officer |
—
mixed-class rows
|
53,613
mixed-class rows
|
$27,032 | — | 10 Nov 2023 | |
| Mary Beth Dooley |
3/4/5
|
Principal Executive Officer and Principal Financial Officer |
0.11%
|
12,744
|
$23,066 | -$284 | 29 Oct 2025 | |
| Richard P. Shea |
3/4/5
|
Director |
0.13%
|
15,506
|
$20,002 | — | 26 Apr 2025 | |
| James P. Flynn |
3/4/5
|
Director |
0.13%
|
15,000
|
$19,350 | — | 26 Apr 2025 | |
| DRW Securities, LLC |
13F
|
Company |
0.2%
|
23,763
|
$14,495 | — | 31 Mar 2026 | |
| Hilltop National Bank |
13F
|
Company |
0%
|
20
|
$12 | — | 31 Mar 2026 | |
| Gregg Beloff |
3/4/5
|
Interim Chief Financial Officer |
—
class O/S missing
|
50,000
|
— | — | 06 Dec 2021 | |
| Lisa Kelly-Croswell |
3/4/5
|
Director |
—
class O/S missing
|
30,000
|
— | — | 22 Jun 2023 | |
| Mathers Edward T. |
3/4/5
|
Director |
—
class O/S missing
|
30,000
|
— | — | 22 Jun 2023 | |
| Michael F. Burgess |
3/4/5
|
Director |
—
class O/S missing
|
30,000
|
— | — | 22 Jun 2023 | |
| Michael Thomas Heffernan |
3/4/5
|
Director |
—
class O/S missing
|
30,000
|
— | — | 22 Jun 2023 | |
| Nick Leschly |
3/4/5
|
Director |
—
class O/S missing
|
30,000
|
— | — | 22 Jun 2023 | |
| Peter Barrett |
3/4/5
|
Director |
—
class O/S missing
|
24,923
|
— | — | 02 Jan 2024 | |
| Patricia N. Hurter |
3/4/5
|
Director |
—
class O/S missing
|
14,678
|
— | — | 02 Jan 2024 |
Recent Insider Transactions by Companies or Individuals for SYNLOGIC, INC.
Showing up to 300 most recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | Value $ | * Price $ | Shares | Shares Owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Mary Beth Dooley | SYBX | Common Stock | Sale | -1.22% | $284 | $1.81 | -157 | 12,744 | 29 Oct 2025 | Direct |
* An asterisk sign (*) next to the price indicates that the price is likely invalid.