| Insider · 17 positions | Net Shares per Quarter (+ Bought / − Sold) | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Name | Role | Shares Held ↓ | Q4 2026 | Q3 2026 | Q2 2026 | Q1 2026 | Q4 2025 | Q3 2025 | Q2 2025 | Q1 2025 | Q4 2024 | Q3 2024 | Q2 2024 | Q1 2024 | Q4 2023 | Q3 2023 | Q2 2023 | Q1 2023 |
| Michael B. Petras Jr. | Executive Chairman | 4.0M | — | -1.1M | — | +170K | -750K | — | — | — | — | — | — | — | — | — | — | — |
| Alton Shader | Chief Executive Officer | 580K | — | — | +681K | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Rutz Michael P | President of Sterigenics | 334K | — | -150K | — | +42K | — | — | — | — | — | — | — | — | — | — | — | — |
| Alexander Dimitrief | Former SVP, GC and Sec. | 312K | — | — | — | -40K | — | — | — | — | — | — | — | — | — | — | — | — |
| Jonathan M. Lyons | Sr. Vice President, CFO | 217K | — | -11K | — | +51K | — | — | — | — | — | — | — | — | — | — | — | — |
| Ann R. Klee | — | 141K | — | — | +15K | — | — | — | — | — | — | — | — | — | — | — | — | — |
| James Neary | — | 96K | — | — | +15K | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Sean Laurence Cunningham | — | 96K | — | — | +15K | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Vincent K Petrella | — | 96K | — | — | +15K | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Ruoxi Chen | — | 96K | — | — | +15K | — | — | — | — | — | — | — | — | — | — | — | — | — |
| David E. Wheadon | — | 90K | — | — | +15K | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Karen Flynn | — | 54K | — | — | +15K | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Christopher Simon, | — | 34K | — | — | +15K | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Richard G Kyle | — | 15K | — | — | +15K | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Kenneth D. Krause | — | 15K | — | — | +15K | — | — | — | — | — | — | — | — | — | — | — | — | — |
| WARBURG PINCUS & CO. | 0 | — | — | -19.1M | -15.0M | -9.7M | — | — | — | — | — | — | — | — | — | — | — | |
| GTCR INVESTMENT XI LLC | — | 0 | — | — | -12.7M | -10.0M | — | — | — | — | — | — | — | — | — | — | — | — |