13F Insight
DOSSIER · 13F Holders · Q1 2025CyclicalNet sold

HORIZON SPACE ACQUISITION II

16 institutions still hold HORIZON SPACE ACQUISITION II as of Q1 2025. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP G4627B103·16 13F holders·last filed Mar 31, 2025
Market cap
—
▼ 0.5%
vs prior quarter
13F value held
$25M
54.0% inst. owned
of float
Holders
16
+73 QoQ
filers reporting
Activity
+34 / −114
+870 added · −870 reduced
this quarter
Concentration
24.96%
MIZUHO SECURITIES USA LLC #1
top holder share
AI Holders Summary · Q1 2025

16 institutions reported HORIZON SPACE ACQUISITION II in Q1 2025. MIZUHO SECURITIES USA LLC leads at 25.0% of the visible book. +73 net new institutions vs prior quarter — accumulation reading.

Top holders

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

#HolderValueShares% port.Quarter
01
MIZUHO SECURITIES USA LLC
CIK 0001513006
$6M625K0.14%Q1 202502
ATW SPAC MANAGEMENT LLC
CIK 0001878495
$6M575K7.54%Q3 202503
AQR Arbitrage LLC
CIK 0001167456
$4M414K0.09%Q4 202504
D. E. Shaw & Co., Inc.
CIK 0001009207
$3M250K0.00%Q4 202505
Clear Street Group Inc.
CIK 0001881567
$2M182K0.01%Q1 202606
RIVERNORTH CAPITAL MANAGEMENT, LLC
CIK 0001447578
$1M130K0.07%Q1 202607
TWO SIGMA INVESTMENTS, LP
CIK 0001179392
$1M207K0.00%Q1 202608
L1 Global Manager Pty Ltd
CIK 0001878742
$967,485150K0.65%Q1 202609
Westchester Capital Management, LLC
CIK 0001512805
$223,27321K0.01%Q1 202610
Quarry LP
CIK 0001965207
$52,1975K0.01%Q1 202611
RLH Capital LLC
CIK 0002008031
$52,1975K0.03%Q1 202612
UBS Group AG
CIK 0001610520
$5,2318110.00%Q1 202613
GLAZER CAPITAL, LLC
CIK 0001076809
$1,706162K0.04%Q1 202614
MORGAN STANLEY
CIK 0000895421
$477740.00%Q1 202615
COOPERMAN LEON G
CIK 0000898382
$2421K0.00%Q1 202616
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00—Q2 2025