DOSSIER · 13F Holders · Q1 2025

HORIZON SPACE ACQUISITION II

8 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 G4627B103·8 13F holders·last filed Mar 31, 2025
Market cap
13F value held
$23M
visible holders
Holders
8
filers reporting
Concentration
27.87%
MIZUHO SECURITIES USA LLC #1
top holder share
AI Holders Summary · Q1 2025

8 institutions reported HORIZON SPACE ACQUISITION II in Q1 2025. MIZUHO SECURITIES USA LLC leads at 27.9% of the visible book.

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 2025
02
ATW SPAC MANAGEMENT LLC
CIK 0001878495
$6M575K7.54%Q3 2025
03
AQR Arbitrage LLC
CIK 0001167456
$4M414K0.09%Q4 2025
04
D. E. Shaw & Co., Inc.
CIK 0001009207
$3M250K0.00%Q4 2025
05
GLAZER CAPITAL, LLC
CIK 0001076809
$2M162K0.04%Q1 2026
06
RIVERNORTH CAPITAL MANAGEMENT, LLC
CIK 0001447578
$1M130K0.07%Q1 2026
07
Westchester Capital Management, LLC
CIK 0001512805
$223K21K0.01%Q2 2026
08
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00Q2 2025