US Activist Hedge Fund Institutional SEC 13D 13G — September 23, 2026
This digest of 21 filings reveals a sharp dichotomy in activist and institutional activity. The most material development is a power transfer at Cheer Holding, where a Hong Kong entity acquired 96.44% voting control for a nominal $500, signaling a potential backdoor listing or restructuring. A major strategic realignment is underway at VNET Group, where CATL affiliates acquired a 38.1% stake, with founder Sheng Chen retaining 34.3% voting power via a consortium agreement, creating a powerful new alliance in the data center space. Conversely, Lantheus Holdings is aggressively reducing its stake in Perspective Therapeutics, selling 2.7 million shares in three weeks as the stock price declined, a clear bearish signal. Saba Capital continues to accumulate Japan Smaller Capitalization Fund, adding $21.7 million in shares, pressing for strategic alternatives. A new activist position emerged at URSB Bancorp, where Lawrence Seidman built a 5.4% stake and is pushing for board representation. The remaining filings are largely passive institutional disclosures (13G) or routine SPAC adjustments, providing limited actionable signals. The overall theme is one of concentrated, high-conviction moves in small- to mid-cap names, with a notable absence of large-scale activist campaigns.