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Form SCHEDULE 13G/A Sotera Health Co Filed by: GTCR INVESTMENT XI LLC

May 15, 2026 4:46 PM





Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
Rule 13d-1(b)
Rule 13d-1(c)
Rule 13d-1(d)




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SCHEDULE 13G





SCHEDULE 13G





SCHEDULE 13G





SCHEDULE 13G





SCHEDULE 13G





SCHEDULE 13G



GTCR INVESTMENT XI LLC
Signature:/s/ Jeffrey Wright
Name/Title:Jeffrey Wright, Chief Legal Officer
Date:05/15/2026
GTCR FUND XI/A LP
Signature:/s/ Jeffrey Wright
Name/Title:Jeffrey Wright, Chief Legal Officer of GTCR Invest. XI LLC, the general partner of GTCR Partners XI/A&C LP, the general partner of GTCR FUND XI/A LP
Date:05/15/2026
GTCR FUND XI/C LP
Signature:/s/ Jeffrey Wright
Name/Title:Jeffrey Wright, Chief Legal Officer of GTCR Invest. XI LLC, the general partner of GTCR Partners XI/A&C LP, the general partner of GTCR FUND XI/A LP
Date:05/15/2026
GTCR CO-INVEST XI LP
Signature:/s/ Jeffrey Wright
Name/Title:Jeffrey Wright, Chief Legal Officer of GTCR Investment XI LLC, the general partner of GTCR CO-INVEST XI LP
Date:05/15/2026
GTCR PARTNERS XI/A&C LP
Signature:/s/ Jeffrey Wright
Name/Title:Jeffrey Wright, Chief Legal Officer of GTCR Investment XI LLC, the general partner of GTCR PARTNERS XI/A&C LP
Date:05/15/2026
Exhibit Information

Exhibit 99.1 Agreement of Joint Filing as required by Rule 13d-1(k)(1) under the Act.* * Incorporated herein by reference to the Agreement of Joint Filing by GTCR Investment XI LLC, GTCR Fund XI/A LP, GTCR Fund XI/C LP, GTCR Co-Invest XI LP and GTCR Partners XI/A&C LP dated as of February 11, 2022, which was previously filed with the Commission as Exhibit A to Amendment No. 1 to Schedule 13G filed by GTCR Investment XI LLC, GTCR Fund XI/A LP, GTCR Fund XI/C LP, GTCR Co-Invest XI LP and GTCR Partners XI/A&C LP on February 11, 2022 with respect to the shares of common stock of Sotera Health Co.

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