SEC ownership of Mountain Lake Acquisition Corp.

Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0002029492.

Comparable stake leader

AQR CAPITAL MANAGEMENT LLC

Disclosed value leader

MIZUHO SECURITIES USA LLC

Comparable rows

7/10

Latest evidence

30 Jun 2026

Top shareholders Insider holders Latest transactions
Parsed ownership sources
13D/G, 13F, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
Largest SEC-reported holder
AQR CAPITAL MANAGEMENT LLC
Ranking: Comparable ownership first, then disclosed value
Ownership snapshot CIK-linked ownership evidence from parsed SEC filings. 3 signals
Comparable ownership rows
7 of 10
Meaning: Rows with safely comparable ownership %
Latest 13D/G holder
AQR CAPITAL MANAGEMENT LLC
Source: Latest parsed Schedule 13D/G stake
Latest parsed ownership date
30 Jun 2026
Freshness: Most recent filing date in this holder set
Issuer Names, identifiers, and filing context for this profile. 2 identity fields
Issuer CIK
0002029492
Issuer location
Incline Village, NV

Ownership snapshot

Top shareholders of Mountain Lake Acquisition Corp. (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Comparable stake leader
AQR CAPITAL MANAGEMENT LLC
Disclosed value leader
MIZUHO SECURITIES USA LLC
Comparable rows
7/10
Latest evidence
30 Jun 2026
13D/G 13F 3/4/5 Lead comparable stake: 6.4% 3 rows are not safely comparable across share classes. 13D/G row: AQR CAPITAL MANAGEMENT LLC Showing 1-8 of 10 holder rows.

Quick read

AQR CAPITAL MANAGEMENT LLC leads the comparable SEC ownership view at 6.4%.

7 of 10 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.

Open SEC evidence Opens AQR CAPITAL MANAGEMENT LLC's linked filing trail.
Comparable ownership Top 5
AQR CAPITAL MANAGEMENT LLC 6.4%
BARCLAYS PLC 4.6%
WOLVERINE ASSET MANAGEMENT LLC 4.6%
K2 PRINCIPAL FUND, L.P. 3.2%
BANK OF MONTREAL /CAN/ 0.56%

Ownership % is shown only when SEC disclosures are safely comparable across share classes.

Detailed SEC evidence table Showing 1-8 of 10 holder rows
Holder Evidence Ownership % Position 12M Net Δ As of
AQR CAPITAL MANAGEMENT LLC
13D/G
13D/G
6.4%
$15,415,755
1,533,906 shares
 -$4,483,245 31 Mar 2025
BARCLAYS PLC
13D/G
13D/G
4.6%
$11,176,275
1,092,500 shares
 -$7,608,562 30 Jun 2025
WOLVERINE ASSET MANAGEMENT LLC
13D/G
13D/G
4.6%
$11,319,032
1,085,238 shares
 -$4,883,535 08 Oct 2025
K2 PRINCIPAL FUND, L.P.
13D/G
The K2 Principal Fund, L.P.
13D/G
3.2%
$7,706,768
748,957 shares
 -$4,641,232 31 Dec 2024
BANK OF MONTREAL /CAN/
13D/G
BANK OF MONTREAL
13D/G
0.56%
$1,426,173
137,132 shares
 -$14,686,578 31 Dec 2025
MIZUHO SECURITIES USA LLC
13F
Company
13F
7.2%
$17,956,481
1,710,141 shares
 — 30 Jun 2026
Crossingbridge Advisors, LLC
13F
Company
13F
0.11%
$265,585
24,961 shares
 — 30 Jun 2026
Douglas Horlick
3/4/5
CFO and President, Director
3/4/5
—
mixed-class rows
—
1,311,541 shares
mixed-class rows
 — 11 Jun 2026
How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

Forms 3/4/5 flow

Insider trading overview

Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 14 Sep 2025.

Buys
$0
Insiders: 0
Sells
$0
Insiders: 0
Net
$0
Shares: 0
Window
Last 12 months
4 rolling buckets
Buy value Sell value
Shares: 0 Shares: 0
Window (months) Buy shares Sell shares Buy value Sell value Net value
0-3 0 0 $0 $0 $0
3-6 0 0 $0 $0 $0
6-9 0 0 $0 $0 $0
9-12 0 0 $0 $0 $0

Reporting owners

Insider holders from Forms 3/4/5

Showing 1-6 of 6 reporting-owner rows connected to Mountain Lake Acquisition Corp.. Open a relationship link for the CIK-to-CIK filing trail.

Rows
6
Largest Forms 3/4/5 holder
Jeffrey T. Lager
Net 12M change
$0
Latest report
11 Jun 2026
Name Relationship Holdings Value Past Year Net Change Change % Valuation Report Date
Jeffrey T. Lager Director $0 Mixed 11 Jun 2026
Vieser Jaime Director $0 Mixed 11 Jun 2026
Paul Grinberg Chief Executive Officer, Director $0 Mixed 11 Jun 2026
Michael J. Marquez Director $0 Mixed 11 Jun 2026
Mountain Lake Acquisition Sponsor LLC 10%+ Owner $0 Mixed 11 Jun 2026
Douglas Horlick CFO and President, Director $0 Mixed 11 Jun 2026

Recent insider transactions for Mountain Lake Acquisition Corp.

Showing up to 300 recent insider transactions from the last 12 months.

Insider Symbol Class Transaction % SEC-reported value SEC-reported price Shares Shares owned Date Ownership
Mountain Lake Acquisition Sponsor LLC MLAC Class A ordinary shares, par value $0.0001 per share Disposed to Issuer -100% -495,000 0 11 Jun 2026 Direct
Mountain Lake Acquisition Sponsor LLC MLAC Class B ordinary shares, par value $0.0001 per share Disposed to Issuer -100% -4,355,724 0 11 Jun 2026 Direct
Paul Grinberg MLAC Class A ordinary shares, par value $0.0001 per share Disposed to Issuer -100% -478,010 0 11 Jun 2026 Direct
Paul Grinberg MLAC Class B ordinary shares, par value $0.0001 per share Options Exercise -100% -478,010 0 11 Jun 2026 Direct
Michael J. Marquez MLAC Class A ordinary shares, par value $0.0001 per share Disposed to Issuer -100% -9,112 0 11 Jun 2026 Direct
Michael J. Marquez MLAC Class A ordinary shares, par value $0.0001 per share Options Exercise 9,112 9,112 11 Jun 2026 Direct
Michael J. Marquez MLAC Class B ordinary shares, par value $0.0001 per share Options Exercise -100% -9,112 0 11 Jun 2026 Direct
Michael J. Marquez MLAC Class B ordinary shares, par value $0.0001 per share Disposed to Issuer -63.6% -15,888 9,112 11 Jun 2026 Direct
Jeffrey T. Lager MLAC Class A ordinary shares, par value $0.0001 per share Disposed to Issuer -100% -9,112 0 11 Jun 2026 Direct
Jeffrey T. Lager MLAC Class A ordinary shares, par value $0.0001 per share Options Exercise 9,112 9,112 11 Jun 2026 Direct
Jeffrey T. Lager MLAC Class B ordinary shares, par value $0.0001 per share Options Exercise -100% -9,112 0 11 Jun 2026 Direct
Jeffrey T. Lager MLAC Class B ordinary shares, par value $0.0001 per share Disposed to Issuer -63.6% -15,888 9,112 11 Jun 2026 Direct
Jaime Vieser MLAC Class A ordinary shares, par value $0.0001 per share Disposed to Issuer -100% -478,010 0 11 Jun 2026 Direct
Jaime Vieser MLAC Class B ordinary shares, par value $0.0001 per share Options Exercise -100% -478,010 0 11 Jun 2026 Direct
Douglas Horlick MLAC Class A ordinary shares, par value $0.0001 per share Disposed to Issuer -100% -478,010 0 11 Jun 2026 Direct
Douglas Horlick MLAC Class B ordinary shares, par value $0.0001 per share Options Exercise -100% -478,010 0 11 Jun 2026 Direct
Mountain Lake Acquisition Sponsor LLC MLAC Class B ordinary shares, par value $0.0001 per share Other -39% -2,781,776 4,355,724 01 Jun 2026 Direct
Paul Grinberg MLAC Class B ordinary shares, par value $0.0001 per share Other 478,010 478,010 01 Jun 2026 Direct
Jaime Vieser MLAC Class B ordinary shares, par value $0.0001 per share Other 478,010 478,010 01 Jun 2026 Direct
Douglas Horlick MLAC Class B ordinary shares, par value $0.0001 per share Other 478,010 478,010 01 Jun 2026 Direct
* marks a reported price that did not pass the local price check.
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