SCHEDULE 13G/A

IsoRay, Inc.

Common Stock, par value $0.01 per share (the "Shares") · CUSIP: 46489V104

Event date: 2025-12-31

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

• Farallon Capital Partners, L.P.

  Shares: 420,581 · Class: 0.6%

• Farallon Capital Institutional Partners, L.P.

  Shares: 495,662 · Class: 0.7%

• Farallon Capital Institutional Partners II, L.P.

  Shares: 99,754 · Class: 0.2%

• Farallon Capital Institutional Partners III, L.P.

  Shares: 58,265 · Class: 0.1%

• Four Crossings Institutional Partners V, L.P.

  Shares: 88,798 · Class: 0.1%

• Farallon Capital Offshore Investors II, L.P.

  Shares: 968,900 · Class: 1.5%

• Farallon Capital (AM) Investors, L.P.

  Shares: 60,808 · Class: 0.1%

• Farallon Capital F5 Master I, L.P.

  Shares: 145,543 · Class: 0.2%

• Farallon Healthcare Partners Master, L.P.

  Shares: 3,089,168 · Class: 4.7%

• Farallon Partners, L.L.C.

  Shares: 5,281,936 · Class: 8%

• Farallon Institutional (GP) V, L.L.C.

  Shares: 88,798 · Class: 0.1%

• Farallon F5 (GP), L.L.C.

  Shares: 145,543 · Class: 0.2%

• Farallon Healthcare Partners (GP), L.L.C.

  Shares: 3,089,168 · Class: 4.7%

• Dapice Joshua J.

  Shares: 5,427,479 · Class: 8.2%

• Dreyfuss, Philip D.

  Shares: 5,427,479 · Class: 8.2%

• Dunn Hannah E.

  Shares: 5,427,479 · Class: 8.2%

• Fried, Richard B

  Shares: 0 · Class: 0%

• Gehani, Varun N.

  Shares: 5,427,479 · Class: 8.2%

• Giauque, Nicolas

  Shares: 5,427,479 · Class: 8.2%

• Husen, Avner A.

  Shares: 5,427,479 · Class: 8.2%

• Kim, David T.

  Shares: 5,427,479 · Class: 8.2%

• Linn, Michael G.

  Shares: 5,427,479 · Class: 8.2%

• Luo Patrick (Cheng)

  Shares: 5,427,479 · Class: 8.2%

• Patel, Rajiv A.

  Shares: 0 · Class: 0%

• Roberts, Jr., Thomas G.

  Shares: 5,427,479 · Class: 8.2%

• Saito Edric C.

  Shares: 5,427,479 · Class: 8.2%

• Seybold, William

  Shares: 0 · Class: 0%

• Short Daniel S.

  Shares: 5,427,479 · Class: 8.2%

• Spokes, Andrew J. M.

  Shares: 5,427,479 · Class: 8.2%

• Warren, John R.

  Shares: 5,427,479 · Class: 8.2%

• Wehrly, Mark C.

  Shares: 5,427,479 · Class: 8.2%

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