Vault-13

GP-ACT III ACQUISITION CORP GPAT

CL A · Common Stock · CUSIP G4035N103

24 institutional holders -28 vs Q1 2026
8,904,6088.9m shares reported held*
$96.9mreported value*
2 new 6 added 12 reduced 29 sold out net sold ≈ $189.1m (-17.4m shares)

* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once. Holder counts are more reliable. Implied quarter-end price ≈ $10.88.

Trends to Q2 2026

Institutional holders

Managers reporting a position, each quarter

0204060Q3 24: 38Q4 24: 43Q1 25: 41Q2 25: 49Q3 25: 52Q4 25: 52Q1 26: 52Q2 26: 2424Q3 24Q1 25Q3 25Q1 26Q2 26
Numbers
QuarterHolders
Q3 202438
Q4 202443
Q1 202541
Q2 202549
Q3 202552
Q4 202552
Q1 202652
Q2 202624

Buyers vs sellers

Managers adding to or starting a position, vs cutting or selling out

Bought or addedCut or sold out
50050Q4 24: 11 bought or addedQ4 24: 15 cut or sold outQ4 24Q1 25: 7 bought or addedQ1 25: 13 cut or sold outQ2 25: 21 bought or addedQ2 25: 12 cut or sold outQ2 25Q3 25: 15 bought or addedQ3 25: 14 cut or sold outQ4 25: 10 bought or addedQ4 25: 15 cut or sold outQ4 25Q1 26: 11 bought or addedQ1 26: 22 cut or sold outQ2 26: 8 bought or addedQ2 26: 41 cut or sold outQ2 26
Numbers
QuarterBought or addedCut or sold out
Q4 20241115
Q1 2025713
Q2 20252112
Q3 20251514
Q4 20251015
Q1 20261122
Q2 2026841

Calls vs puts

Options held, notional value, last 4 quarters. P/C = puts ÷ calls

CallsPuts
$0$10k$20k$30k$40kQ3 25 calls: $39.0kQ3 25 puts: $0Q3 25P/C 0.00Q4 25 calls: $0Q4 25 puts: $0Q4 25P/C —Q1 26 calls: $0Q1 26 puts: $0Q1 26P/C —Q2 26 calls: $0Q2 26 puts: $0Q2 26P/C —
Numbers
QuarterCallsPutsP/C
Q3 2025$39.0k$00.00
Q4 2025$0$0—
Q1 2026$0$0—
Q2 2026$0$0—

Biggest buyers

Polar Asset Management Partners Inc. Added +625,004+625.0k
MIZUHO SECURITIES USA LLC Added +558,486+558.5k
HGC Investment Management Inc. Added +399,387+399.4k
Verition Fund Management LLC Added +171,297+171.3k
HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND New +149,950+149.9k
HRT FINANCIAL LP New +14,965+15.0k
GEODE CAPITAL MANAGEMENT, LLC Added +9,967+10.0k
CITADEL ADVISORS LLC Added +2,867+2.9k

Biggest sellers

Karpus Management, Inc. Sold out -2,230,216-2.2m
First Trust Capital Management L.P. Sold out -2,091,077-2.1m
D. E. Shaw & Co., Inc. Sold out -1,423,125-1.4m
LMR Partners LLP Sold out -1,225,000-1.2m
PICTON MAHONEY ASSET MANAGEMENT Reduced -1,125,000-1.1m
Wealthspring Capital LLC Sold out -1,006,939-1.0m
Westchester Capital Management, LLC Sold out -860,852-860.9k
Linden Advisors LP Sold out -797,584-797.6k
TENOR CAPITAL MANAGEMENT Co., L.P. Sold out -750,000-750.0k
WOLVERINE ASSET MANAGEMENT LLC Sold out -745,440-745.4k

Major shareholders (over 5%)

Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.

HolderStakeChangeShares Last filed
GP-Act III Sponsor LLC 13G · exempt (held before listing) new · filed 2025-03-07 19.8% new 7.1m≈ $77.3m 2025-03-07
Polar Asset Management Partners Inc. 13G · institution +7.0 pts · filed 2026-06-04 11.1% +7.0 pts 1.8m≈ $19.6m 2026-06-04
AQR CAPITAL MANAGEMENT LLC 13G · institution filed 2026-08-14 8.7% 1.4m≈ $15.2m 2026-08-14
HGC Investment Management Inc. 13G · institution new · filed 2025-02-14 8.6% new 2.5m≈ $26.9m 2025-02-14
METEORA CAPITAL, LLC 13G · institution new · filed 2025-08-14 6.7% new 1.9m≈ $20.9m 2025-08-14
BARCLAYS PLC 13G · institution no change · filed 2025-03-28 5.2% no change 1.5m≈ $16.2m 2025-03-28

Fell to 5% or below in the last year: First Trust Capital Management L.P. (0.0%, 2026-08-14), Karpus Management, Inc. (0.0%, 2026-06-05), PICTON MAHONEY ASSET MANAGEMENT (4.8%, 2026-04-27), BANK OF MONTREAL /CAN/ (0.0%, 2026-02-12)

Insider purchases and sales since 1 Apr 2026

Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.

None reported since 1 Apr 2026.

Holders, Q2 2026

#ManagerLocationShares Value% of their portfolioChangeShares change
1 Polar Asset Management Partners Inc. 0.36% of their portfolio TORONTO, A6 1,800,0001.8m $19.6m $19.6m 0.36% Added +625.0k +625,004
2 AQR Arbitrage LLC 0.22% of their portfolio Greenwich, CT 1,400,0001.4m $15.2m $15.2m 0.22% Reduced -176.8k -176,803
3 MMCAP International Inc. SPC 1.17% of their portfolio GRAND CAYMAN, E9 1,275,0001.3m $13.9m $13.9m 1.17% Unchanged
4 Alberta Investment Management Corp 0.06% of their portfolio EDMONTON, A0 1,000,0001.0m $10.9m $10.9m 0.06% Reduced -625.0k -625,000
5 MIZUHO SECURITIES USA LLC 0.06% of their portfolio NEW YORK, NY 618,584618.6k $6.7m $6.7m 0.06% Added +558.5k +558,486
6 BERKLEY W R CORP 0.27% of their portfolio Greenwich, CT 497,064497.1k $5.4m $5.4m 0.27% Reduced -349.8k -349,759
7 HGC Investment Management Inc. 0.86% of their portfolio TORONTO, A6 399,387399.4k $4.3m $4.3m 0.86% Added +399.4k +399,387
8 Verition Fund Management LLC 0.03% of their portfolio GREENWICH, CT 398,885398.9k $4.3m $4.3m 0.03% Added +171.3k +171,297
9 TORONTO DOMINION BANK 0.01% of their portfolio TORONTO, ONTARIO, A6 345,181345.2k $3.8m $3.8m 0.01% Reduced -290.3k -290,284
10 DEUTSCHE BANK AG\ 0.00% of their portfolio FRANKFURT AM MAIN, 2M 290,000290.0k $3.1m $3.1m 0.00% Unchanged
11 PICTON MAHONEY ASSET MANAGEMENT 0.03% of their portfolio Toronto, A6 250,000250.0k $2.7m $2.7m 0.03% Reduced -1.1m -1,125,000
12 Periscope Capital Inc. 0.26% of their portfolio Toronto, A6 150,000150.0k $1.7m $1.7m 0.26% Reduced -100.0k -100,000
13 HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND 0.00% of their portfolio TORONTO, A6 149,950149.9k $1.6m $1.6m 0.00% New
14 JPMORGAN CHASE & CO 0.00% of their portfolio NEW YORK, NY 99,86099.9k $1.1m $1.1m 0.00% Reduced -450.0k -450,038
15 Lineage Point Capital LP 0.15% of their portfolio PALM BEACH, FL 64,79564.8k $716.0k $716.0k 0.15% Reduced -205 -205
16 MOORE CAPITAL MANAGEMENT, LP 0.01% of their portfolio NEW YORK, NY 50,00050.0k $543.5k $543.5k 0.01% Reduced -150.0k -150,000
17 Kepos Capital LP 0.64% of their portfolio NEW YORK, NY 42,50042.5k $470.0k $470.0k 0.64% Unchanged
18 GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio BOSTON, MA 21,36221.4k $232.6k $232.6k 0.00% Added +10.0k +9,967
19 CITADEL ADVISORS LLC 0.00% of their portfolio MIAMI, FL 20,03920.0k $218.2k $218.2k 0.00% Added +2.9k +2,867
20 HRT FINANCIAL LP 0.00% of their portfolio NEW YORK, NY 14,96515.0k $162.0k $162.0k 0.00% New
21 Clear Street Group Inc. 0.00% of their portfolio NEW YORK, NY 9,1959.2k $100.0k $100.0k 0.00% Reduced -1.1k -1,126
22 LONGFELLOW INVESTMENT MANAGEMENT CO LLC 0.02% of their portfolio BOSTON, MA 7,8007.8k $84.8k $84.8k 0.02% Unchanged
23 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 2323 $250 $250 0.00% Reduced -41 -41
24 UBS Group AG 0.00% of their portfolio ZURICH, V8 1818 $195 $195 0.00% Reduced -168 -168