DOSSIER · 13F Holders · Q3 2026

LIGHTBRIDGE CORP

4 institutions still hold LIGHTBRIDGE CORP as of Q3 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 53224K902·4 13F holders·last filed Sep 30, 2026
Market cap
—
13F value held
$791K
visible holders
Holders
4
filers reporting
Concentration
65.02%
GROUP ONE TRADING LLC #1
top holder share
AI Holders Summary · Q3 2026

4 institutions reported LIGHTBRIDGE CORP in Q3 2026. GROUP ONE TRADING LLC leads at 65.0% of the visible book.

Top holders

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

#HolderValueShares% port.Quarter
01
GROUP ONE TRADING LLC
CIK 0000932540
$515K82K0.00%Q3 2026
02
IMC-Chicago, LLC
CIK 0001452861· Market maker
$254K40K0.00%Q3 2026
03
SIMPLEX TRADING, LLC
CIK 0001488542
$23K4K0.00%Q3 2026
04
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00—Q2 2025