SCHEDULE 13G

US NEUROSURGICAL INC

Common Stock, par value $0.01 per share · CUSIP: 90336K101

Event date: 2025-02-20

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• Allen Holding Inc.

  Shares: 1,578,489.00 · Class: 7.60%

• Allen & Company Incorporated

  Shares: 1,578,489.00 · Class: 7.60%

• Herbert A. Allen

  Shares: 1,578,489.00 · Class: 7.60%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.