DOSSIER · 13F Holders · Q2 2026

MERCURY SYS INC

3 institutions still hold MERCURY SYS INC as of Q2 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 589378908·3 13F holders·last filed Jun 30, 2026
Market cap
13F value held
$7M
visible holders
Holders
3
filers reporting
Concentration
90.41%
IMC-Chicago, LLC #1
top holder share
AI Holders Summary · Q2 2026

3 institutions reported MERCURY SYS INC in Q2 2026. IMC-Chicago, LLC leads at 90.4% of the visible book.

Top holders

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

#HolderValueShares% port.Quarter
01
IMC-Chicago, LLC
CIK 0001452861· Market maker
$6M49K0.00%Q2 2026
02
GROUP ONE TRADING LLC
CIK 0000932540
$636K5K0.00%Q2 2026
03
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00Q2 2025