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Magnetar Financial LLC, Magnetar Capital Partners LP, Supernova Management LLC and David J. Snyderman have filed a Schedule 13G disclosing a 5.91 % passive stake in Dune Acquisition Corp II (Class A ordinary shares, CUSIP G2867S109, symbol IPODU). As of the event date 30 Jun 2025, the group beneficially owned 850,000 shares out of 14.375 million outstanding, crossing the 5 % reporting threshold but remaining below the 10 % level that could trigger greater regulatory scrutiny.
The position is spread across eight Magnetar-managed funds, with Constellation Master Fund holding the largest block (229,500 shares). All voting and dispositive powers are shared; none are held solely. The filing was signed 8 Aug 2025 and states that the shares were acquired in the ordinary course of business, with no intent to change or influence control of the issuer, qualifying the group to file on a passive 13G basis rather than an activist 13D.