13F reference period
Q2 2026
Security Snapshot
Keystone Acquisition Corp. - Class A ordinary shares, par value $0.0001 (KEYYU) Institutional Ownership
CUSIP: G52539114
13F Institutional Holders and Ownership History from Q2 2026 to Q3 2026
Institutions Reporting
29
Shares (Excl. Options)
13.46M
Full value: 13,462,146 · shares · 30 Jun 2026Price
$10.04
The headline uses the Q2 2026 reference period after its reporting deadline. Available reports may still be incomplete or amended. Newer periods in the history table contain incoming reports and may be incomplete.
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- Security type / class
- Equity / Class A ordinary shares, par value $0.0001
- Symbol
- KEYYU on Nasdaq
- All holders as of 30 Jun 2026
- Q2 2026
- Total 13F shares
- 13,462,146
- Total 13F value
- $135,240,254
- Portfolio coverage rank
- 0%
- Share change
- +12,935,421
- Value change
- +$129,951,935
- Number of holders
- 29
- Shares outstanding
- 28,735,632
- SEC-reported price per share
- $10.14
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
2 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Filing notes and source
Key facts
- KEYYU - Keystone Acquisition Corp. - Class A ordinary shares, par value $0.0001 is tracked under CUSIP G52539114.
- 29 institutions reported positions in Q2 2026.
- 1 significant owner is listed from Schedule 13D/13G reporting.
Change
- The headline uses Q2 2026 reported holdings.
- Quarter-over-quarter comparison is unavailable because the immediately preceding quarter is missing.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 29 institutions filings for Q2 2026.
Security key
G52539114
13F reference period
Q2 2026
13F holders
29
13D/G owners
1
CIK / CUSIP context first
Open Q2 2026 holders
KEYYU full holder history
Keystone Acquisition Corp. SEC filings
Keystone Acquisition Corp. company facts
Keystone Acquisition Corp. insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP G52539114:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
1
Security
KEYYU
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| Magnetar Financial LLC | 7% | $20,280,000 | 2,000,000 | MAGNETAR FINANCIAL LLC | 30 Jun 2026 |
As of 30 Jun 2026,
29
institutional investors reported holding
shares of
Keystone Acquisition Corp. - Class A ordinary shares, par value $0.0001 (KEYYU).
This represents
47%
of the company’s total
outstanding shares.
13.46M
Full value: 13,462,146 · shares · 30 Jun 202628.74M
Full value: 28,735,632 · shares · Stored outstanding share count13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
47%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| Magnetar Financial LLC | 7% | 2,000,000 | 0.18% | $20,080,000 | |
| AQR Arbitrage LLC | 6% | 1,723,275 | 0.25% | $17,301,681 | |
| LMR Partners LLP | 4.5% | 1,300,000 | 0.1% | $13,052,000 | |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | 4.4% | 1,250,000 | 0.02% | $12,575,000 | |
| Alberta Investment Management Corp | 2.8% | 800,000 | 0.05% | $8,048,000 | |
| HGC Investment Management Inc. | 2.8% | 800,000 | 1.6% | $8,032,000 | |
| Fort Baker Capital Management LP | 2.1% | 600,000 | 0.48% | $6,024,000 | |
| BNP PARIBAS FINANCIAL MARKETS | 1.8% | 526,725 | 0% | 0% | $5,288,319 |
| MILLENNIUM MANAGEMENT LLC | 1.7% | 500,000 | 0% | $5,020,000 | |
| Radcliffe Capital Management, L.P. | 1.7% | 499,900 | 0.38% | $5,018,996 | |
| Centiva Capital, LP | 1.5% | 425,000 | 0.14% | $4,267,000 | |
| PICTON MAHONEY ASSET MANAGEMENT | 1.4% | 400,000 | 0.04% | $4,016,001 | |
| Decagon Asset Management LLP | 1.3% | 375,000 | 0.75% | $3,765,001 | |
| WHITEBOX ADVISORS LLC | 1.2% | 350,000 | 0.06% | $3,514,000 | |
| MOORE CAPITAL MANAGEMENT, LP | 1% | 300,000 | 0.07% | $3,012,000 | |
| Lineage Point Capital LP | 1% | 295,719 | 0.61% | $2,969,019 | |
| Schonfeld Strategic Advisors LLC | 0.7% | 200,000 | 0.01% | $2,007,999 | |
| Calamos Advisors LLC | 0.7% | 200,000 | 0.01% | $2,018,000 | |
| RIVERNORTH CAPITAL MANAGEMENT, LLC | 0.7% | 200,000 | 0.1% | $2,030,000 | |
| TORONTO DOMINION BANK | 0.7% | 199,900 | 0% | $2,006,996 | |
| Ghisallo Capital Management LLC | 0.52% | 150,000 | 0.03% | $1,513,500 | |
| ARISTEIA CAPITAL, L.L.C. | 0.5% | 144,062 | 0.02% | $1,446,382 | |
| DLD Asset Management, LP | 0.35% | 100,000 | 0.08% | $1,004,000 | |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 0.14% | 40,000 | 0% | $401,600 | |
| ABC ARBITRAGE SA | 0.1% | 30,000 | 0.03% | $301,200 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
2
Headline period
Q2 2026
Rows shown
1-2 of 2