DOSSIER · 13F Holders · Q2 2026

STAK INC

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

CUSIP G84092116·8 13F holders·last filed Jun 30, 2026
Market cap
13F value held
$254K
visible holders
Holders
8
filers reporting
Concentration
32.09%
XTX Topco Ltd #1
top holder share
AI Holders Summary · Q2 2026

8 institutions reported STAK INC in Q2 2026. XTX Topco Ltd leads at 32.1% of the visible book.

Top holders

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

#HolderValueShares% port.Quarter
01
XTX Topco Ltd
CIK 0001828301
$81K21K0.00%Q2 2026
02
UBS Group AG
CIK 0001610520
$77K20K0.00%Q2 2026
03
JANE STREET GROUP, LLC
CIK 0001595888· Market maker
$54K54K0.00%Q1 2026
04
CITADEL ADVISORS LLC
CIK 0001423053
$22K54K0.00%Q4 2025
05
Tower Research Capital LLC (TRC)
CIK 0001533421
$19K5K0.00%Q2 2026
06
Caitong International Asset Management Co., Ltd
CIK 0001963355
$410.00%Q2 2026
07
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00Q2 2025
08
ROYAL BANK OF CANADA
CIK 0001000275
$01000.00%Q2 2026