Vault-13

MOUNTAIN LAKE ACQUISIT CORP MLAA

USD CL A ORD SHS · Common Stock · CUSIP G6301L109

59 institutional holders +28 vs Q1 2026
32,607,21132.6m shares reported held*
$323.8mreported value*
32 new 6 added 10 reduced 4 sold out net bought ≈ $156.0m (+15.7m shares)

* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once. Holder counts are more reliable. Implied quarter-end price ≈ $9.93.

Trends to Q2 2026

Institutional holders

Managers reporting a position, each quarter

0204060Q1 26: 31Q2 26: 5959Q1 26Q2 26
Numbers
QuarterHolders
Q1 202631
Q2 202659

Biggest buyers

ARISTEIA CAPITAL, L.L.C. New +2,189,405+2.2m
Alberta Investment Management Corp New +1,750,000+1.8m
AQR Arbitrage LLC New +1,449,082+1.4m
Kryger Capital LLC New +1,270,887+1.3m
LMR Partners LLP New +1,250,000+1.2m
HIGHBRIDGE CAPITAL MANAGEMENT LLC Added +1,032,456+1.0m
Fort Baker Capital Management LP New +1,000,000+1.0m
Westchester Capital Management, LLC New +853,517+853.5k
MILLENNIUM MANAGEMENT LLC New +765,000+765.0k
D. E. Shaw & Co., Inc. Added +754,999+755.0k

Biggest sellers

HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND Sold out -1,250,000-1.2m
Verition Fund Management LLC Reduced -312,410-312.4k
Shaolin Capital Management LLC Reduced -308,763-308.8k
Polar Asset Management Partners Inc. Reduced -200,000-200.0k
Periscope Capital Inc. Reduced -150,000-150.0k
Clear Street Group Inc. Reduced -111,146-111.1k
Galaxy Digital Inc. Sold out -100,000-100.0k
CSS LLC/IL Reduced -85,735-85.7k
BOOTHBAY FUND MANAGEMENT, LLC Sold out -50,000-50.0k
Hudson Bay Capital Management LP Reduced -50,000-50.0k

Major shareholders (over 5%)

Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.

HolderStakeChangeShares Last filed
MOUNTAIN LAKE ACQUISITION SPONSOR II LLC 13D · may seek influence new · filed 2026-02-04
Stated purposeIn 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-all… Full filing
 25.6% new 12.5m≈ $124.3m 2026-02-04
Adage Capital Management, L.P. 13G · institution new · filed 2026-05-13 5.7% new 2.1m≈ $20.9m 2026-05-13
Magnetar Financial LLC 13G · institution new · filed 2026-05-13 5.4% new 2.0m≈ $19.9m 2026-05-13

Insider purchases and sales since 1 Apr 2026

Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.

Officers and directors buying vs selling

Number of people, by quarter (10% owners not included)

BuyingSelling
101Q4 24: 0 buyingQ4 24: 0 sellingQ1 25: 0 buyingQ1 25: 0 sellingQ1 25Q2 25: 0 buyingQ2 25: 0 sellingQ3 25: 0 buyingQ3 25: 0 sellingQ3 25Q4 25: 0 buyingQ4 25: 0 sellingQ1 26: 1 buyingQ1 26: 0 sellingQ1 26Q2 26: 0 buyingQ2 26: 0 sellingQ3 26: 0 buyingQ3 26: 0 sellingQ3 26
Numbers
QuarterBuyingBoughtSellingSoldSold under a plan
Q4 20240—0——
Q1 20250—0——
Q2 20250—0——
Q3 20250—0——
Q4 20250—0——
Q1 20261$5.1m0——
Q2 20260—0——
Q3 20260—0——

None reported since 1 Apr 2026.

Holders, Q2 2026

#ManagerLocationShares Value% of their portfolioChangeShares change
1 ARISTEIA CAPITAL, L.L.C. 0.34% of their portfolio GREENWICH, CT 2,189,4052.2m $21.7m $21.7m 0.34% New
2 ADAGE CAPITAL PARTNERS GP, L.L.C. 0.03% of their portfolio Boston, MA 2,100,0002.1m $20.9m $20.9m 0.03% Unchanged
3 Magnetar Financial LLC 0.18% of their portfolio EVANSTON, IL 2,000,0002.0m $19.9m $19.9m 0.18% Unchanged
4 Alberta Investment Management Corp 0.10% of their portfolio EDMONTON, A0 1,750,0001.8m $17.4m $17.4m 0.10% New
5 Linden Advisors LP 0.08% of their portfolio New York, NY 1,500,0001.5m $14.9m $14.9m 0.08% Unchanged
6 AQR Arbitrage LLC 0.20% of their portfolio Greenwich, CT 1,449,0821.4m $14.4m $14.4m 0.20% New
7 HIGHBRIDGE CAPITAL MANAGEMENT LLC 0.44% of their portfolio NEW YORK, NY 1,309,4591.3m $13.0m $13.0m 0.44% Added +1.0m +1,032,456
8 Kryger Capital LLC 0.72% of their portfolio HAMILTON, D0 1,270,8871.3m $12.6m $12.6m 0.72% New
9 LMR Partners LLP 0.09% of their portfolio LONDON, X0 1,250,0001.2m $12.4m $12.4m 0.09% New
10 D. E. Shaw & Co., Inc. 0.01% of their portfolio New York, NY 1,080,0001.1m $10.7m $10.7m 0.01% Added +755.0k +754,999
11 TENOR CAPITAL MANAGEMENT Co., L.P. 0.15% of their portfolio NEW YORK, NY 1,059,5881.1m $10.5m $10.5m 0.15% Unchanged
12 Fort Baker Capital Management LP 0.79% of their portfolio Larkspur, CA 1,000,0001.0m $9.9m $9.9m 0.79% New
13 SONA ASSET MANAGEMENT (US) LLC 0.37% of their portfolio NEW YORK, NY 1,000,0001.0m $9.9m $9.9m 0.37% Unchanged
14 GLAZER CAPITAL, LLC 0.23% of their portfolio New York, NY 950,000950.0k $9.4m $9.4m 0.23% Reduced -21.4k -21,419
15 Westchester Capital Management, LLC 0.43% of their portfolio VALHALLA, NY 853,517853.5k $8.5m $8.5m 0.43% New
16 Polar Asset Management Partners Inc. 0.15% of their portfolio TORONTO, A6 800,000800.0k $7.9m $7.9m 0.15% Reduced -200.0k -200,000
17 MILLENNIUM MANAGEMENT LLC 0.01% of their portfolio NEW YORK, NY 765,000765.0k $7.6m $7.6m 0.01% New
18 BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio PARIS, I0 742,958743.0k $7.4m $7.4m 0.00% New
19 First Trust Capital Management L.P. 0.35% of their portfolio CHICAGO, IL 600,000600.0k $6.0m $6.0m 0.35% New
20 Verition Fund Management LLC 0.04% of their portfolio GREENWICH, CT 587,590587.6k $5.8m $5.8m 0.04% Reduced -312.4k -312,410
21 TWO SIGMA INVESTMENTS, LP 0.00% of their portfolio NEW YORK, NY 567,675567.7k $5.6m $5.6m 0.00% Unchanged
22 MMCAP International Inc. SPC 0.42% of their portfolio GRAND CAYMAN, E9 500,000500.0k $5.0m $5.0m 0.42% New
23 MOORE CAPITAL MANAGEMENT, LP 0.11% of their portfolio NEW YORK, NY 500,000500.0k $5.0m $5.0m 0.11% New
24 PICTON MAHONEY ASSET MANAGEMENT 0.05% of their portfolio Toronto, A6 500,000500.0k $5.0m $5.0m 0.05% New
25 RIVERNORTH CAPITAL MANAGEMENT, LLC 0.24% of their portfolio WEST PALM BEACH, FL 499,531499.5k $5.0m $5.0m 0.24% New
26 Radcliffe Capital Management, L.P. 0.35% of their portfolio BALA CYNWYD, PA 458,116458.1k $4.5m $4.5m 0.35% Added +54.1k +54,134
27 BERKLEY W R CORP 0.22% of their portfolio Greenwich, CT 447,794447.8k $4.4m $4.4m 0.22% Unchanged
28 Shaolin Capital Management LLC 0.24% of their portfolio Miami, FL 428,537428.5k $4.3m $4.3m 0.24% Reduced -308.8k -308,763
29 Sculptor Capital LP 0.04% of their portfolio New York, NY 427,532427.5k $4.2m $4.2m 0.04% New
30 WHITEBOX ADVISORS LLC 0.06% of their portfolio MINNEAPOLIS, MN 400,000400.0k $4.0m $4.0m 0.06% Unchanged
31 WOLVERINE ASSET MANAGEMENT LLC 0.05% of their portfolio CHICAGO, IL 392,778392.8k $3.9m $3.9m 0.05% New
32 Ghisallo Capital Management LLC 0.07% of their portfolio BOSTON, MA 375,000375.0k $3.7m $3.7m 0.07% Unchanged
33 Periscope Capital Inc. 0.55% of their portfolio Toronto, A6 350,000350.0k $3.5m $3.5m 0.55% Reduced -150.0k -150,000
34 Wealthspring Capital LLC 0.75% of their portfolio WEST HARRISON, NY 336,480336.5k $3.3m $3.3m 0.75% New
35 Lineage Point Capital LP 0.60% of their portfolio PALM BEACH, FL 294,214294.2k $2.9m $2.9m 0.60% New
36 Mint Tower Capital Management B.V. 0.29% of their portfolio AMSTERDAM, P7 250,000250.0k $2.5m $2.5m 0.29% Unchanged
37 Schonfeld Strategic Advisors LLC 0.01% of their portfolio NEW YORK, NY 235,000235.0k $2.3m $2.3m 0.01% Added +224.9k +224,877
38 COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS 0.01% of their portfolio HARRISBURG, PA 200,000200.0k $2.0m $2.0m 0.01% New
39 RLH Capital LLC 0.71% of their portfolio Great Neck, NY 150,000150.0k $1.5m $1.5m 0.71% New
40 Rangeley Capital, LLC 1.18% of their portfolio NEW CANAAN, CT 127,791127.8k $1.3m $1.3m 1.18% New
41 MIZUHO SECURITIES USA LLC 0.01% of their portfolio NEW YORK, NY 125,405125.4k $1.2m $1.2m 0.01% New
42 READYSTATE ASSET MANAGEMENT LP 0.05% of their portfolio CHICAGO, IL 125,000125.0k $1.2m $1.2m 0.05% New
43 CSS LLC/IL 0.05% of their portfolio CHICAGO, IL 104,501104.5k $1.0m $1.0m 0.05% Reduced -85.7k -85,735
44 DLD Asset Management, LP 0.08% of their portfolio NEW YORK, NY 100,000100.0k $993.0k $993.0k 0.08% Unchanged
45 HGC Investment Management Inc. 0.20% of their portfolio TORONTO, A6 100,000100.0k $993.0k $993.0k 0.20% New
46 Quarry LP 0.12% of their portfolio NEW YORK, NY 75,23375.2k $747.1k $747.1k 0.12% New
47 Hudson Bay Capital Management LP 0.00% of their portfolio STAMFORD, CT 50,00050.0k $496.5k $496.5k 0.00% Reduced -50.0k -50,000
48 Centiva Capital, LP 0.01% of their portfolio New York, NY 41,77741.8k $414.8k $414.8k 0.01% New
49 Virtu Financial LLC 0.01% of their portfolio New York, NY 36,38936.4k $361.0k $361.0k 0.01% Reduced -43.5k -43,481
50 DELTEC ASSET MANAGEMENT LLC 0.04% of their portfolio New York, NY 30,00030.0k $297.9k $297.9k 0.04% Reduced -20.0k -20,000
51 Cable Car Capital, LP 0.01% of their portfolio SAN FRANCISCO, CA 30,00030.0k $297.9k $297.9k 0.01% New
52 Clear Street Group Inc. 0.00% of their portfolio NEW YORK, NY 25,20825.2k $250.3k $250.3k 0.00% Reduced -111.1k -111,146
53 PenderFund Capital Management Ltd. 0.03% of their portfolio VANCOUVER, A1 23,40023.4k $232.4k $232.4k 0.03% Added +18.4k +18,400
54 CITADEL ADVISORS LLC 0.00% of their portfolio MIAMI, FL 16,05916.1k $159.5k $159.5k 0.00% New
55 Meteora Capital, LLC 0.01% of their portfolio Boca Raton, FL 12,53212.5k $124.4k $124.4k 0.01% New
56 TrueMark Investments, LLC 0.01% of their portfolio CHICAGO, IL 11,03111.0k $109.5k $109.5k 0.01% New
57 Arax Advisory Partners 0.00% of their portfolio NEW YORK, NY 1,5001.5k $14.9k $14.9k 0.00% New
58 JPMORGAN CHASE & CO 0.00% of their portfolio NEW YORK, NY 1,2191.2k $12.1k $12.1k 0.00% New
59 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 2323 $228 $228 0.00% Added +6 +6