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GPATU · GP-Act III Acquisition Corp. · Holdings

Track GPATU — free
$10.99 At close · Sep 22
Market Cap
$179.07M
Shares
16.16M
Volume · Sep 22 100 Avg daily vol (4 sessions) 126

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Institutional holdings are being reconciled with SEC filings. Holder totals and changes may be incomplete until reconciliation finishes.
Holders: 2
Total Value: $224,595
Total Shares: 20,455

Institutional Ownership Trend

9 quarters

Holder Concentration

Across 2 13F filers
Top Holder
80.6%
Jun 2024 → Jun 2026 · range 0.0% – 99.4%
of institutional value
Top 5
100.0%
Jun 2024 → Jun 2026 · range 0.0% – 100.0%
of institutional value
Top 10
100.0%
Jun 2024 → Jun 2026 · range 0.0% – 100.0%
of institutional value
HHI
6,872
Jun 2024 → Jun 2026 · range 0 – 9,874
Highly concentrated

Who Holds GPATU

Last 8 quarters through Jun 30, 2026

Each kind of 13F filer's share of the common shares 13F filers report. Holder type comes from regulatory records, never the filer's name; style, turnover and horizon are measured from each filer's own 13F book. The quarter selector does not change this card.

Jun 30, 2026: 2 filers, like-for-like change -91.1%; actively managed books -91.1%.

Holder type Share Filers Change
Registered adviser 0.0% 0 -100.0%
Bank 19.4% 1 0.0%
Broker-dealer 0.0% 0 —
Exempt adviser 0.0% 0 —
Adviser 0.0% 0 —
Insurer 0.0% 0 —
Non-US 0.0% 0 —
Unknown 80.6% 1 +11.7%
How the mix is measured

Shares are 13F common shares restated to today's split basis; options and principal amounts are left out. The change compares only filers with a 13F in both quarters and keeps each filer in its bucket of the later quarter on both sides; a filer that continues under a new CIK is compared through its successor. Holder type comes from each filer's current regulatory profile; client base and private funds come from the Form ADV roster current at each quarter end (rosters from December 2019, so an earlier quarter reads Unknown). Style, turnover, horizon and book size are measured from each filer's 13F book in the newest measured quarter, and Not measured means none was. Actively managed books are those measured systematic-like, concentrated or diversified active.

Conviction and Crowding

2 13F filers, quarter ended Jun 30, 2026

Measured across every 13F filer's common-share book once the quarter's filing window closed. Crowding counts filers with high turnover or that advise private funds on Form ADV.

Conviction holders
0
0.000% of filers hold it in their top 10
Mar 31, 2026: 1
Holders above 5%
0
median weight 0.000%
Mar 31, 2026: 0
Crowding
—
shares outstanding is an issuer-wide count, not one listing's
Private-fund advisers
—
of shares outstanding
Institutional ownership
—
shares outstanding is an issuer-wide count, not one listing's
Top 10 holders
100.0%
of 13F shares, Herfindahl 0.687
Active holders
-91.1%
like-for-like share change of active filers
5% stakes on record
1
0 13D, 1 13G (0 institutional, 1 passive, 0 exempt)
How long holders have held it value-weighted 4.6 quarters
Under 1 year 0.000% 1 to 3 years 100.0% 3 years or more 0.000% Since coverage start 0.000%

Managers in the top fifth by current three-year FundScore alpha were net buyers of $0 (0 buying, 0 selling).

Shared Holders

Companies GPATU's active holders also own, quarter ended Jun 30, 2026
# Company Shared holders
1 AEAQ Activate Energy Acquisition Corp. 3
2 SOUL Soulpower Acquisition Corp. 3
3 CEPV Cantor Equity Partners V, Inc. 3

Shareholder Targets

13F filers that own its peers but not GPATU, quarter ended Jun 30, 2026

Found through its holder-overlap peers: AEAQ, SOUL, CEPV. 70 filers in all.

# Filer In peers
1 Magnetar Financial LLC Registered adviser, Concentrated $31,269,000 3 held
2 TENOR CAPITAL MANAGEMENT Co., L.P. Registered adviser, Diversified active $29,237,700 3 held
3 Westchester Capital Management, LLC Registered adviser, Diversified active $21,303,351 3 held
4 ADAGE CAPITAL PARTNERS GP, L.L.C. Registered adviser, Diversified active $20,578,250 2 held
5 First Trust Capital Management L.P. Registered adviser, Diversified active $19,000,863 3 held
6 WOLVERINE ASSET MANAGEMENT LLC Registered adviser, Diversified active $17,079,097 3 held
7 HIGHBRIDGE CAPITAL MANAGEMENT LLC Registered adviser, Diversified active $14,547,510 3 held
8 Crossingbridge Advisors, LLC Adviser, Diversified active $13,726,711 2 held
9 MILLENNIUM MANAGEMENT LLC Registered adviser, Systematic-like $13,129,130 3 held
10 D. E. Shaw & Co., Inc. Unknown, Systematic-like $12,550,620 3 held

Quarterly Activity

vs Mar 31, 2026
New
0
Increased
1
Decreased
0
Sold Out
1
Unchanged
1

New and Sold Out count only filers that reported a 13F for both quarters: a first-time filer's book is not a buy, and a fund that has not filed, or withheld its positions under confidential treatment, has not sold.

Holder count: -1
Institutional value: —
Shares held: -91.1%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
No qualifying movers this quarter.

Top New Positions

vs Mar 31, 2026
No new positions this quarter.

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 2 of 2
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1834526 CUSIP G4035N103 Visit website