DOSSIER · 13F Holders · Q2 2026

UNITED MICROELECTRONICS CORP

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

CUSIP 910873955·5 13F holders·last filed Jun 30, 2026
Market cap
13F value held
$26M
visible holders
Holders
5
filers reporting
Concentration
70.85%
GROUP ONE TRADING LLC #1
top holder share
AI Holders Summary · Q2 2026

5 institutions reported UNITED MICROELECTRONICS CORP in Q2 2026. GROUP ONE TRADING LLC leads at 70.8% 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
$18M667K0.03%Q2 2026
02
SIMPLEX TRADING, LLC
CIK 0001488542
$5M199K0.00%Q2 2026
03
IMC-Chicago, LLC
CIK 0001452861· Market maker
$2M75K0.00%Q2 2026
04
Timothy G. Youngquist 2020 Irrevocable Trust
CIK 0002109159
$2K8K0.00%Q2 2026
05
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00Q2 2025