13F Insight
DOSSIER · 13F Holders · Q1 2026

BLACKSTONE INC

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

CUSIP 09260D907·12 13F holders·last filed Mar 31, 2026
Market cap
—
13F value held
$326M
visible holders
Holders
12
filers reporting
Concentration
43.93%
Optiver Holding B.V. #1
top holder share
AI Holders Summary · Q1 2026

12 institutions reported BLACKSTONE INC in Q1 2026. Optiver Holding B.V. leads at 43.9% 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
$143M1.2M0.05%Q1 202602
IMC-Chicago, LLC
CIK 0001452861· Market maker
$60M523K0.02%Q1 202603
GROUP ONE TRADING LLC
CIK 0000932540
$34M296K0.07%Q1 202604
JPMORGAN CHASE & CO
CIK 0000019617
$34M305K0.00%Q1 202605
SIMPLEX TRADING, LLC
CIK 0001488542
$25M213K0.02%Q1 202606
Maven Securities LTD
CIK 0001633046
$20M172K0.38%Q1 202607
LANDMARK INVESTMENT PARTNERS, L.P.
CIK 0002023551
$7M6325.22%Q1 202608
HRT FINANCIAL LP
CIK 0001475597
$2M13K0.01%Q4 202509
Capital Markets Trading UK LLP
CIK 0001719165
$1M10K0.01%Q1 202610
OSAIC HOLDINGS, INC.
CIK 0001677044
$32K100.00%Q1 202611
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00—Q2 202512
Compagnie Lombard Odier SCmA
CIK 0001615423
$000.00%Q1 2026