13F Insight
DOSSIER · 13F Holders · Q3 2026

GP-ACT III ACQUISITION CORP

29 institutions still hold GP-ACT III ACQUISITION CORP as of Q3 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP G4035N103·29 13F holders·last filed Jun 30, 2026
Market cap
—
13F value held
$123M
visible holders
Holders
29
filers reporting
Concentration
15.88%
Polar Asset Management Partners Inc. #1
top holder share
AI Holders Summary · Q3 2026

29 institutions reported GP-ACT III ACQUISITION CORP in Q3 2026. Polar Asset Management Partners Inc. leads at 15.9% of the visible book.

Top holders

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

#HolderValueShares% port.Quarter
01
Polar Asset Management Partners Inc.
CIK 0001326389
$20M1.8M0.32%Q2 202602
AQR Arbitrage LLC
CIK 0001167456
$17M1.6M0.35%Q4 202503
D. E. Shaw & Co., Inc.
CIK 0001009207
$15M1.4M0.01%Q4 202504
MMCAP International Inc. SPC
CIK 0001304857
$14M1.3M0.92%Q3 202605
Alberta Investment Management Corp
CIK 0001463559· Sovereign
$11M1.0M0.06%Q3 202606
BERKLEY W R CORP
CIK 0000011544
$5M497K0.25%Q2 202607
Verition Fund Management LLC
CIK 0001454027
$4M399K0.02%Q3 202608
HGC Investment Management Inc.
CIK 0001711200
$4M399K0.86%Q2 202609
RIVERNORTH CAPITAL MANAGEMENT, LLC
CIK 0001447578
$4M360K0.20%Q1 202610
TORONTO DOMINION BANK
CIK 0000947263
$4M345K0.00%Q2 202611
DEUTSCHE BANK AG\
CIK 0000948046
$3M290K0.00%Q3 202612
MIZUHO SECURITIES USA LLC
CIK 0000812291
$3M263K0.04%Q3 202613
PICTON MAHONEY ASSET MANAGEMENT
CIK 0001539041
$3M250K0.02%Q3 202614
Jain Global LLC
CIK 0002024579
$3M250K0.01%Q1 202615
OCONNOR, A Distinct Business Unit of UBS ASSET MANAGEMENT AMERICAS (LLC)
CIK 0001132716
$3M250K0.07%Q4 202516
GLAZER CAPITAL, LLC
CIK 0001076809
$3M236K0.05%Q1 202617
SONA ASSET MANAGEMENT (US) LLC
CIK 0001856405
$2M200K0.05%Q1 202618
PERISCOPE CAPITAL INC.
CIK 0001695320
$2M150K0.17%Q3 202619
HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND
CIK 0001535845
$2M150K0.00%Q3 202620
Lineage Point Capital LP
CIK 0002093311
$695K65K0.26%Q4 2025
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