13F Insight
DOSSIER · 13F Holders · Q2 2026

BLACKSTONE INC

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

CUSIP 09260D957·10 13F holders·last filed Jun 30, 2026
Market cap
—
13F value held
$550M
visible holders
Holders
10
filers reporting
Concentration
53.01%
Optiver Holding B.V. #1
top holder share
AI Holders Summary · Q2 2026

10 institutions reported BLACKSTONE INC in Q2 2026. Optiver Holding B.V. leads at 53.0% 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
$291M2.5M0.08%Q2 202602
IMC-Chicago, LLC
CIK 0001452861· Market maker
$97M828K0.02%Q2 202603
GROUP ONE TRADING LLC
CIK 0000932540
$80M677K0.11%Q2 202604
SIMPLEX TRADING, LLC
CIK 0001488542
$37M314K0.02%Q2 202605
JPMORGAN CHASE & CO
CIK 0000019617
$27M232K0.00%Q2 202606
HRT FINANCIAL LP
CIK 0001475597
$11M70K0.03%Q4 202507
Capital Markets Trading UK LLP
CIK 0001719165
$4M31K0.04%Q1 202608
Maven Securities LTD
CIK 0001633046
$3M24K0.06%Q2 202609
SG Americas Securities, LLC
CIK 0001313360
$510K468K0.00%Q1 202610
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00—Q2 2025