DOSSIER · 13F Holders · Q1 2026

HORIZON SPACE ACQUISITION II

6 institutions still hold HORIZON SPACE ACQUISITION II as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP G4627B111·6 13F holders·last filed Mar 31, 2026
Market cap
13F value held
$290K
visible holders
Holders
6
filers reporting
Concentration
44.88%
RIVERNORTH CAPITAL MANAGEMENT, LLC #1
top holder share
AI Holders Summary · Q1 2026

6 institutions reported HORIZON SPACE ACQUISITION II in Q1 2026. RIVERNORTH CAPITAL MANAGEMENT, LLC leads at 44.9% of the visible book.

Top holders

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

#HolderValueShares% port.Quarter
01
RIVERNORTH CAPITAL MANAGEMENT, LLC
CIK 0001447578
$130K592K0.01%Q1 2026
02
ATW SPAC MANAGEMENT LLC
CIK 0001878495
$86K575K0.11%Q3 2025
03
AQR Arbitrage LLC
CIK 0001167456
$64K425K0.00%Q4 2025
04
MIZUHO SECURITIES USA LLC
CIK 0001513006
$10K100K0.00%Q1 2025
05
FNY Investment Advisers, LLC
CIK 0001742998
$01K0.00%Q1 2026
06
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00Q2 2025