Ken Griffin raised his stake in Sphere Entertainment to 5.3%, according to a Monday SEC filing. The hedge fund titan previously owned 1.6% of the Sphere through his investment firm Citadel but added more than 900,000 shares since April 1, and now holds 1.5 million shares.

Griffin boosted his position at the same time as another hedge fund giant was investing in the Sphere. Last month, New York Mets owner Steve Cohen disclosed a new 5.5% stake in Sphere Entertainment in an SEC filing for his hedge fund Point72 Asset Management. The move aligned Cohen with fellow New York team owner Jim Dolan, whose family has voting control of the Sphere, in addition to the New York Knicks and New York Rangers.

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