SCHEDULE 13G

Tandem Diabetes Care Inc

Common Stock, par value $0.001 per share · CUSIP: 875372203

Event date: 2025-03-31

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

• Sessa Capital (Master), L.P.

  Shares: 4,466,307.00 · Class: 6.71%

• Sessa Capital GP, LLC

  Shares: 4,466,307.00 · Class: 6.71%

• Sessa Capital IM, L.P.

  Shares: 4,466,307.00 · Class: 6.71%

• Sessa Capital IM GP, LLC

  Shares: 4,466,307.00 · Class: 6.71%

• John Petry

  Shares: 4,466,307.00 · Class: 6.71%

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