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Livermore
Livermore
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Mountain Lake Acquisition Corp. II

MLAA
Exchange
Nasdaq
Industry
Blank Checks
SEC CIK
0002094265

No open-market purchases or sales by Mountain Lake Acquisition Corp. II insiders were filed in the last 90 days; 59 institutions reported holding it in 13F filings for Q2 2026, worth $323.8M in total; no superinvestor holds it.

Other share classesMLAAUMLAAW

Holders of 5% or more of MLAA

Holders whose latest Schedule 13D or 13G filing reports 5% or more of Mountain Lake Acquisition Corp. II, largest stake first. The change is against the holder's previous filing.

Holders of 5% or more of MLAA
HolderLatest formStakeChangeFirst filedLatest filingFiling
Mountain Lake Acquisition Sponsor II LLC13D25.60%12.5M sharesNewFeb 4, 20261 filingFeb 4, 2026SEC
Adage Capital Management, L.P.13G5.68%2.10M sharesNewMay 13, 20261 filingMay 13, 2026SEC
Magnetar Financial LLC13G5.40%2.00M sharesNewMay 13, 20261 filingMay 13, 2026SEC

Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.

13D and 13G filings

3 Schedule 13D and 13G filings on Mountain Lake Acquisition Corp. II, newest first, including old-format filings without a stake.

Schedule 13D and 13G filings on MLAA
Filed (ET)FilerFormStakeChangeEvent dateFiling
May 13, 20269:50 AM ETMagnetar Financial LLCand 3 others13G5.40%2.00M sharesNewMar 31, 2026SEC
May 13, 20269:30 AM ETAdage Capital Management, L.P.and 2 others13G5.68%2.10M sharesNewMar 31, 2026SEC
Feb 4, 20265:00 PM ETMountain Lake Acquisition Sponsor II LLCand 2 others13D25.60%12.5M sharesNewJan 28, 2026SEC

Form 144: proposed insider sales

Notices from officers, directors and other affiliates planning to sell Mountain Lake Acquisition Corp. II shares.

No Form 144 notices for Mountain Lake Acquisition Corp. II are on file.