Grinberg Paul 4

4 · Mountain Lake Acquisition Corp. II · Filed Mar 18, 2026

AI-generated summary of this filing

Updated Mar 18, 2026

Mountain Lake (MLAAU) 10% Owner Paul Grinberg Cancels 6,000 Founder Shares

What Happened

Paul Grinberg, a 10% owner and managing member of Mountain Lake Acquisition Sponsor II LLC (the Sponsor), reported a disposition of 6,000 Class B ordinary shares on 2026-03-16. The shares were returned to the issuer and cancelled for no consideration (price $0.00). The transaction is reported as a derivative "other acquisition or disposition" (code J) rather than an open-market sale.

Key Details

Transaction date: 2026-03-16; Filing date: 2026-03-18 (filed two days after the transaction).
Quantity and price: 6,000 Class B ordinary shares disposed/cancelled at $0.00.
Shares owned after transaction: Not specified in the Form 4.
Footnotes of note:
- F1: Class B founder shares automatically convert one-for-one into Class A shares at the time (or before) an initial business combination; Class B shares have no expiration.
- F2: The 6,000 Class B shares were returned and cancelled because the underwriters’ over‑allotment option was not exercised in full.
- F3: Grinberg (with Douglas Horlick) is a managing member of the Sponsor and may be deemed to beneficially own shares held of record by the Sponsor, though they disclaim beneficial ownership except for any pecuniary interest.
Timeliness: Filing appears timely (filed two days after the reported transaction).

Context

This was not an open-market sale by the individual for cash but a cancellation/return of founder shares tied to IPO mechanics (over-allotment not exercised). For retail investors, such sponsor share cancellations are a corporate-structural item rather than a personal sale signaling insider sentiment.

Form 4

Period: 2026-03-16

DirectorCEO10% Owner

Transactions

Other
Class B Ordinary Shares
[F1][F2][F3]
2026-03-16−6,000→ 12,000,000 total
→ Class A Ordinary Shares (6,000 underlying)

Footnotes (3)

[F1]As described in the registration statement on Form S-1 (File No. 333-291833) of Mountain Lake Acquisition Corp. II (the "Issuer") under the heading "Description of Securities - Founder Shares," the Class B ordinary shares will automatically convert into Class A ordinary shares at the time of the Issuer's initial business combination, or at any time prior to the Issuer's initial business combination, at the option of the holder, on a one-for-one basis, subject to certain adjustments. The Class B ordinary shares have no expiration date.
[F2]As contemplated in connection with the initial public offering of the Issuer, 6,000 Class B ordinary shares of the Issuer held by Mountain Lake Acquisition Sponsor II LLC (the "Sponsor") were returned to the Issuer for no consideration and cancelled because the underwriters' over-allotment option was not exercised in full.
[F3]Paul Grinberg and Douglas Horlick are the managing members of the Sponsor and hold voting and investment discretion with respect to the Class B ordinary shares held of record by the Sponsor. As such, Messrs. Grinberg and Horlick may be deemed to have beneficial ownership of the securities held of record by the Sponsor. Messrs. Grinberg and Horlick disclaim any beneficial ownership except to the extent of their pecuniary interest therein.

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