13F Insight
DOSSIER · 13F Holders · Q2 2026

CITIGROUP INC

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

CUSIP 172967954·12 13F holders·last filed Jun 30, 2026
Market cap
—
13F value held
$2.0B
visible holders
Holders
12
filers reporting
Concentration
34.86%
Optiver Holding B.V. #1
top holder share
AI Holders Summary · Q2 2026

12 institutions reported CITIGROUP INC in Q2 2026. Optiver Holding B.V. leads at 34.9% of the visible book.

Top holders

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

#HolderValueShares% port.Quarter
01
Optiver Holding B.V.
CIK 0001859606· Market maker
$688M4.9M0.19%Q2 202602
IMC-Chicago, LLC
CIK 0001452861· Market maker
$388M2.8M0.09%Q2 202603
CMT Capital Markets Trading GmbH
CIK 0001632813
$275M2.4M2.88%Q1 202604
Assenagon Asset Management S.A.
CIK 0001546007· Quasi-passive
$184M1.4M0.18%Q3 202605
SIMPLEX TRADING, LLC
CIK 0001488542
$182M1.3M0.11%Q2 202606
JPMORGAN CHASE & CO
CIK 0000019617
$114M798K0.01%Q2 202607
GROUP ONE TRADING LLC
CIK 0000932540
$105M749K0.15%Q2 202608
Capital Markets Trading UK LLP
CIK 0001719165
$16M139K0.20%Q1 202609
HRT FINANCIAL LP
CIK 0001475597
$14M120K0.04%Q4 202510
SG Americas Securities, LLC
CIK 0001313360
$7M2.4M0.01%Q1 202611
Maven Securities LTD
CIK 0001633046
$2M17K0.05%Q2 202612
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00—Q2 2025