13F Insight
DOSSIER · 13F Holders · Q1 2026

CITIGROUP INC

15 institutions still hold CITIGROUP INC as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 172967954·15 13F holders·last filed Mar 31, 2026
Market cap
—
13F value held
$1.9B
visible holders
Holders
15
filers reporting
Concentration
27.87%
Optiver Holding B.V. #1
top holder share
AI Holders Summary · Q1 2026

15 institutions reported CITIGROUP INC in Q1 2026. Optiver Holding B.V. leads at 27.9% 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
$527M4.6M0.18%Q1 202602
IMC-Chicago, LLC
CIK 0001452861· Market maker
$322M2.8M0.12%Q1 202603
CMT Capital Markets Trading GmbH
CIK 0001632813
$275M2.4M2.88%Q1 202604
JPMORGAN CHASE & CO
CIK 0000019617
$247M2.3M0.02%Q1 202605
Assenagon Asset Management S.A.
CIK 0001546007· Quasi-passive
$199M1.4M0.25%Q2 202606
SIMPLEX TRADING, LLC
CIK 0001488542
$193M1.7M0.13%Q1 202607
GROUP ONE TRADING LLC
CIK 0000932540
$62M547K0.12%Q1 202608
RH Tailwind Management, LLC
CIK 0002065331
$20M180K2.61%Q1 202609
Capital Markets Trading UK LLP
CIK 0001719165
$16M139K0.20%Q1 202610
HRT FINANCIAL LP
CIK 0001475597
$14M120K0.04%Q4 202511
SG Americas Securities, LLC
CIK 0001313360
$7M2.4M0.01%Q1 202612
Maven Securities LTD
CIK 0001633046
$5M43K0.09%Q1 202613
CenterStar Asset Management, LLC
CIK 0001722053
$3M23K0.32%Q1 202614
Tennessee Valley Asset Management Partners
CIK 0001826790
$13420.00%Q1 202615
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00—Q2 2025