Vault-13

MOUNTAIN LAKE ACQUISITION CO

SHS CL A · CUSIP G6301B101

2 institutional holders -45 vs Q1 2026
1,735,1021.7m shares reported held*
$18.2mreported value*
0 new 0 added 1 reduced 44 sold out net sold ≈ $224.2m (-21.2m 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 ≈ $10.50.

Trends to Q2 2026

Institutional holders

Managers reporting a position, each quarter

0204060Q1 25: 37Q2 25: 45Q3 25: 46Q4 25: 48Q1 26: 47Q2 26: 22Q1 25Q2 25Q3 25Q4 25Q1 26Q2 26
Numbers
QuarterHolders
Q1 202537
Q2 202545
Q3 202546
Q4 202548
Q1 202647
Q2 20262

Buyers vs sellers

Managers adding to or starting a position, vs cutting or selling out

Bought or addedCut or sold out
50050Q2 25: 19 bought or addedQ2 25: 14 cut or sold outQ2 25Q3 25: 8 bought or addedQ3 25: 11 cut or sold outQ3 25Q4 25: 17 bought or addedQ4 25: 27 cut or sold outQ4 25Q1 26: 12 bought or addedQ1 26: 12 cut or sold outQ1 26Q2 26: 0 bought or addedQ2 26: 45 cut or sold outQ2 26
Numbers
QuarterBought or addedCut or sold out
Q2 20251914
Q3 2025811
Q4 20251727
Q1 20261212
Q2 2026045

Calls vs puts

Options held, notional value, last 4 quarters. P/C = puts ÷ calls

CallsPuts
$0$20k$40k$60kQ3 25 calls: $48.8kQ3 25 puts: $0Q3 25P/C 0.00Q4 25 calls: $0Q4 25 puts: $0Q4 25P/C —Q1 26 calls: $0Q1 26 puts: $0Q1 26P/C —Q2 26 calls: $0Q2 26 puts: $0Q2 26P/C —
Numbers
QuarterCallsPutsP/C
Q3 2025$48.8k$00.00
Q4 2025$0$0—
Q1 2026$0$0—
Q2 2026$0$0—

Biggest buyers

None

Biggest sellers

TENOR CAPITAL MANAGEMENT Co., L.P. Sold out -2,000,000-2.0m
Magnetar Financial LLC Sold out -1,900,000-1.9m
BERKLEY W R CORP Sold out -1,877,833-1.9m
Polar Asset Management Partners Inc. Sold out -1,497,259-1.5m
AQR Arbitrage LLC Sold out -1,405,969-1.4m
First Trust Capital Management L.P. Sold out -980,393-980.4k
Alberta Investment Management Corp Sold out -980,000-980.0k
WOLVERINE ASSET MANAGEMENT LLC Sold out -971,757-971.8k
Westchester Capital Management, LLC Sold out -887,700-887.7k
Linden Advisors LP Sold out -875,000-875.0k

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
AQR CAPITAL MANAGEMENT LLC 13G · institution -1.9 pts · filed 2025-05-14 6.4% -1.9 pts 1.5m 2025-05-14

Fell to 5% or below in the last year: Magnetar Financial LLC (0.0%, 2026-09-04), Polar Asset Management Partners Inc. (0.0%, 2026-08-14), TENOR CAPITAL MANAGEMENT Co., L.P. (0.0%, 2026-08-14), MIZUHO FINANCIAL GROUP INC (0.0%, 2026-08-13), BERKLEY W R CORP (0.0%, 2026-08-06), BANK OF MONTREAL /CAN/ (0.6%, 2026-02-13), WOLVERINE ASSET MANAGEMENT LLC (4.6%, 2025-12-23)

Holders, Q2 2026

#ManagerLocationShares Value% of their portfolioChangeShares change
1 MIZUHO SECURITIES USA LLC 0.17% of their portfolio NEW YORK, NY 1,710,1411.7m $18.0m $18.0m 0.17% Unchanged
2 Crossingbridge Advisors, LLC 0.05% of their portfolio PLEASANTVILLE, NY 24,96125.0k $265.6k $265.6k 0.05% Reduced -417.5k -417,499