As of November 6, 2026, 3 holders' latest Schedule 13D or 13G filings report owning 5% or more of Highview Merger Corp. The largest reported stake is Highview Sponsor Co., LLC's, at 20.82%. 7 filings are on record since August 13, 2025 (Schedule 13D, August 13, 2025).
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Key facts
- · Holder: Healthcare of Ontario Pension Plan Trust Fund · Percent: 4.2% · SCHEDULE 13G/A
- · Holder: Millennium Management LLC · Percent: 4.2% · SCHEDULE 13G/A
- · Holder: Adage Capital Management, L.P. · Percent: 7.61% · SCHEDULE 13G
- · Holder: AQR Capital Management, LLC · Percent: 5.36% · SCHEDULE 13G
- · Holder: Healthcare of Ontario Pension Plan Trust Fund · Percent: 5.3% · SCHEDULE 13G
Highview Merger Corp. has 7 Schedule 13D or 13G filings on record since 2025-08-13. 3 holders' latest filing reports 5% or more of class a ordinary shares, $0.0001 par value. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Highview Sponsor Co., LLC | 20.82% | 6,122,500 | SCHEDULE 13D, 2025-08-13 | 2025-08-11 |
| Adage Capital Management, L.P. | 7.61% | 1,800,000 | SCHEDULE 13G, 2025-11-13 | 2025-09-30 |
| AQR Capital Management, LLC | 5.36% | 1,268,226 | SCHEDULE 13G, 2025-11-13 | 2025-09-30 |
| Millennium Management LLC | 4.2% | 999,996 | SCHEDULE 13G/A, 2026-01-27 | 2025-12-31 |
| Healthcare of Ontario Pension Plan Trust Fund | 4.2% | 1,000,000 | SCHEDULE 13G/A, 2026-02-13 | 2025-12-31 |
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More on Highview Merger Corp. and the records around it.
Companies that share a holder
- Healthcare of Ontario Pension Plan Trust Fund also filed stake reports on 27 other companies: Cambridge Acquisition Corp. (Aug 2026), General Purpose Acquisition Corp. (May 2026), Artius II Acquisition Inc. (Feb 2026)
- Millennium Management LLC also filed stake reports on 121 other companies: StepStone Group Inc. (Nov 2026), Catalyst Acquisition Corp. (Nov 2026), RxSight, Inc. (Nov 2026)
- Adage Capital Management, L.P. also filed stake reports on 136 other companies: ACP Holdings Acquisition Corp. (Aug 2026), AmperCap Acquisition Company (Aug 2026), Aura Biosciences, Inc. (Aug 2026)
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Purpose of Transaction (Item 4)
Highview Sponsor Co., LLC
Founder Shares On April 16, 2025, the Sponsor paid $25,000 to cover certain of Issuer's offering and formation costs in exchange for 5,750,000 Class B ordinary shares, par value $0.0001 per share of the Issuer (the "Class B ordinary shares" or the "Founder Shares"). The Founder Shares will automatically convert into Class A ordinary shares immediately prior to, concurrently with or immediately following the consummation of the Issuer's initial business combination (the "Business Combination") or earlier at the option of the holder on a one-for-one basis, subject to the adjustments and anti-dilution rights described under the heading "Description of Securities--Founder Shares and Private Placement Shares" in the Issuer's prospectus (File No. 333-288914). Private Placement Units Simultaneously with the closing of the IPO, on August 13, 2025, pursuant to a Private Placement Units Purchase Agreement (the "Private Placement Units Purchase Agreement"), the Issuer completed the private sale of 372,500 units (the "Private Placement Units") at a purchase price of $10.00 per unit, to the Sponsor, generating gross proceeds to the Issuer of $3,725,000. Each Private Placement Unit consists of one Class A ordinary share and one-half of one warrant. The Private Placement Units are identical to the units sold in the IPO, except that the Private Placement Units (including the securities comprising such units) may not, subject to certain limited exceptions, be transferred, assigned or sold …The first part of Item 4 of the SCHEDULE 13D filed 2025-08-13; the filing has the rest
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-08-13 | Highview Sponsor Co., LLC | 20.82% | SCHEDULE 13D |
| 2025-08-14 | Millennium Management LLC | 5.7% | SCHEDULE 13G |
| 2025-11-13 | Adage Capital Management, L.P. | 7.61% | SCHEDULE 13G |
| 2025-11-13 | AQR Capital Management, LLC | 5.36% | SCHEDULE 13G |
| 2025-11-13 | Healthcare of Ontario Pension Plan Trust Fund | 5.3% | SCHEDULE 13G |
| 2026-01-27 | Millennium Management LLC | 4.2% | SCHEDULE 13G/A |
| 2026-02-13 | Healthcare of Ontario Pension Plan Trust Fund | 4.2% | SCHEDULE 13G/A |
Questions about who owns Highview Merger Corp.
Who owns Highview Merger Corp.?
On this page, 3 holders' latest ownership filings report 5% or more of Highview Merger Corp.: Highview Sponsor Co., LLC (20.82%, Schedule 13D, filed 2025-08-13), Adage Capital Management, L.P. (7.61%, Schedule 13G, filed 2025-11-13) and AQR Capital Management, LLC (5.36%, Schedule 13G, filed 2025-11-13).
Who are the largest shareholders of Highview Merger Corp.?
By the share each holder's latest filing reports, the largest holders of Highview Merger Corp. on this page are Highview Sponsor Co., LLC (20.82%), Adage Capital Management, L.P. (7.61%) and AQR Capital Management, LLC (5.36%).
When did Highview Sponsor Co., LLC buy into Highview Merger Corp.?
The filings give report dates, not purchase dates. The earliest filing from Highview Sponsor Co., LLC on this page is the Schedule 13D, filed 2025-08-13, reporting 20.82%.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 7 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
Also on the record for Highview Merger Corp.
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| August 12, 2025 | IPO filing, Form 424B4 | — | IPO filings | Source |
| August 1, 2025 | IPO filing, Form S-1/A | — | IPO filings | Source |
| July 24, 2025 | IPO filing, Form S-1 | — | IPO filings | Source |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.