DOSSIER · 13F Holders · Q2 2026

GRAIL INC

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

CUSIP 384747951·5 13F holders·last filed Jun 30, 2026
Market cap
13F value held
$10M
visible holders
Holders
5
filers reporting
Concentration
47.62%
IMC-Chicago, LLC #1
top holder share
AI Holders Summary · Q2 2026

5 institutions reported GRAIL INC in Q2 2026. IMC-Chicago, LLC leads at 47.6% 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
$5M73K0.00%Q2 2026
02
Parkman Healthcare Partners LLC
CIK 0001777015
$3M46K0.32%Q2 2026
03
GROUP ONE TRADING LLC
CIK 0000932540
$2M27K0.00%Q2 2026
04
SIMPLEX TRADING, LLC
CIK 0001488542
$526K8K0.00%Q2 2026
05
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00Q2 2025