DOSSIER · 13F Holders · Q4 2025
SYBX

SYNLOGIC INC

3 institutions still hold SYNLOGIC INC as of Q4 2025. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 87166L209·3 13F holders·last filed Dec 31, 2025
Market cap
13F value held
$173K
visible holders
Holders
3
filers reporting
Concentration
91.63%
CITADEL ADVISORS LLC #1
top holder share
AI Holders Summary · Q4 2025

3 institutions reported SYBX in Q4 2025. CITADEL ADVISORS LLC leads at 91.6% of the visible book.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
CITADEL ADVISORS LLC
CIK 0001423053
$159K142K0.00%Q4 2025
02
DRW Securities, LLC
CIK 0001481986· Market maker
$14K24K0.00%Q1 2026
03
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00Q2 2025
Insiders at SYNLOGIC INC
Dooley Mary BethFlynn James PShea Richard PAwad AntoineHurter Patricia N.Barrett PeterBrennan AoifeJensen Michael Vangsted