As of November 6, 2026, 4 holders' latest Schedule 13D or 13G filings report owning 5% or more of Mountain Lake Acquisition Corp. Ii. The largest reported stake is Mountain Lake Acquisition Sponsor II LLC's, at 25.6%. 4 filings are on record since February 4, 2026 (Schedule 13D, February 4, 2026).
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Key facts
- · Holder: Aristeia Capital, L.L.C. · Percent: 5.91% · SCHEDULE 13G
- · Holder: Adage Capital Management, L.P. · Percent: 5.68% · SCHEDULE 13G
- · Holder: Magnetar Financial LLC · Percent: 5.4% · SCHEDULE 13G
- · Holder: Mountain Lake Acquisition Sponsor II LLC · Percent: 25.6% · SCHEDULE 13D
Mountain Lake Acquisition Corp. Ii has 4 Schedule 13D or 13G filings on record since 2026-02-04. 4 holders' latest filing reports 5% or more of units, each consisting of one class a ordinary share and one-half of one redeemable warrant. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Mountain Lake Acquisition Sponsor II LLC | 25.6% | 12,516,000 | SCHEDULE 13D, 2026-02-04 | 2026-01-28 |
| Aristeia Capital, L.L.C. | 5.91% | 2,186,394 | SCHEDULE 13G, 2026-05-14 | 2026-03-31 |
| Adage Capital Management, L.P. | 5.68% | 2,100,000 | SCHEDULE 13G, 2026-05-13 | 2026-03-31 |
| Magnetar Financial LLC | 5.4% | 2,000,000 | SCHEDULE 13G, 2026-05-13 | 2026-03-31 |
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More on Mountain Lake Acquisition Corp. Ii and the records around it.
Companies that share a holder
- Aristeia Capital, L.L.C. also filed stake reports on 54 other companies: Apogee Acquisition Corp (Aug 2026), ARC Group Acquisition I Corp (Aug 2026), ClearThink 1 Acquisition Corp. (Aug 2026)
- MAGNETAR FINANCIAL LLC also filed stake reports on 97 other companies: Blue Acquisition Corp. (Sep 2026), CENTURION ACQUISITION CORP. (Sep 2026), Churchill Capital Corp IX (Sep 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)
Mountain Lake Acquisition Sponsor II LLC
In connection with the organization of the Issuer, on October 23, 2025, 10,005,000 Class B Ordinary Shares (the "Founder Shares") were purchased by the Sponsor for the amount of $25,000, pursuant to a Securities Subscription Agreement, dated as of October 23, 2025, by and between the Sponsor and the Issuer (the "Founder Share Purchase Agreement"), as more fully described in Item 6 of this Schedule 13D which information is incorporated herein by reference. In January 2026, the Issuer effected a share capitalization, resulting in the Sponsor holding an aggregate of 12,006,000 Founder Shares. Of the 12,006,000 Class B Ordinary Shares held, up to 6,000 shares are subject to forfeiture in the event that the underwriter in the Issuer's initial public offering does not fully exercise its over-allotment option. On January 28, 2026, simultaneously with the consummation of the Issuer's Initial Public Offering (the "IPO"), the Sponsor purchased 510,000 units ("Placement Units") of the Issuer at $10.00 per Placement Unit, pursuant to a Private Placement Units Purchase Agreement, dated as of January 26, 2026, by and between the Issuer and the Sponsor (the "Placement Units Purchase Agreement"), as more fully described in Item 6 of this Schedule 13D, which information is incorporated herein by reference. Each Placement Unit consists of one Class A Ordinary Share and one-half of a warrant, with each whole warrant exercisable into one Class A ordinary share at an exercise price of $11.50, …The first part of Item 4 of the SCHEDULE 13D filed 2026-02-04; the filing has the rest
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2026-02-04 | Mountain Lake Acquisition Sponsor II LLC | 25.6% | SCHEDULE 13D |
| 2026-05-13 | Adage Capital Management, L.P. | 5.68% | SCHEDULE 13G |
| 2026-05-13 | Magnetar Financial LLC | 5.4% | SCHEDULE 13G |
| 2026-05-14 | Aristeia Capital, L.L.C. | 5.91% | SCHEDULE 13G |
Questions about who owns Mountain Lake Acquisition Corp. Ii
Who owns Mountain Lake Acquisition Corp. Ii?
On this page, 4 holders' latest ownership filings report 5% or more of Mountain Lake Acquisition Corp. Ii: Mountain Lake Acquisition Sponsor II LLC (25.6%, Schedule 13D, filed 2026-02-04), Aristeia Capital, L.L.C. (5.91%, Schedule 13G, filed 2026-05-14), Adage Capital Management, L.P. (5.68%, Schedule 13G, filed 2026-05-13) and Magnetar Financial LLC (5.4%, Schedule 13G, filed 2026-05-13).
Who are the largest shareholders of Mountain Lake Acquisition Corp. Ii?
By the share each holder's latest filing reports, the largest holders of Mountain Lake Acquisition Corp. Ii on this page are Mountain Lake Acquisition Sponsor II LLC (25.6%), Aristeia Capital, L.L.C. (5.91%) and Adage Capital Management, L.P. (5.68%).
When did Mountain Lake Acquisition Sponsor II LLC buy into Mountain Lake Acquisition Corp. Ii?
The filings give report dates, not purchase dates. The earliest filing from Mountain Lake Acquisition Sponsor II LLC on this page is the Schedule 13D, filed 2026-02-04, reporting 25.6%.
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%); 4 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 Mountain Lake Acquisition Corp. Ii
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| January 28, 2026 | IPO filing, Form 424B4 | — | IPO filings | Source |
| January 21, 2026 | IPO filing, Form S-1/A | — | IPO filings | Source |
| November 26, 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.