Sotera Health
Provides contract sterilization, gamma technologies, and testing services for healthcare-product safety.
$19.27
After-hours close0.00 (0.00%)
At close$19.27(−1.08%)
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Breakdown13F · Form 4
Institutions 106.22%Insiders 2.29%
A 13F quarter can total more than the shares outstanding — sub-advisers file the same block twice, and a filer's own share count can be a quarter stale. No split is drawn from it.
Shares outstanding 285.17M · Float 154.14M · 54.1% free float
Institutions13F, as of Jun 30, 2026
317 holders · 302.90M shares · 59 new positions · 224 increased · 65 reduced · 40 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| Sessa Capital Im, L.P. | 27.05M | 9.49% | +4.00M | Aug 14, 2026 |
| Darsana Capital Partners LP | 27.00M | 9.47% | +1.00M | Aug 14, 2026 |
| BlackRock, Inc. | 24.15M | 8.47% | +3.30M | Aug 7, 2026 |
| Sculptor Capital LP | 24.00M | 8.42% | +2.28M | Aug 14, 2026 |
| Sachem Head Capital Management LP | 15.56M | 5.46% | +3.92M | Aug 14, 2026 |
| Vanguard Capital Management LLC | 12.17M | 4.27% | +1.44M | Aug 13, 2026 |
| Vanguard Portfolio Management LLC | 11.95M | 4.19% | +1.34M | Aug 13, 2026 |
| AQR Capital Management LLC | 10.73M | 3.76% | +4.01M | Aug 14, 2026 |
Beneficial owners13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| WP XI Partners, L.P. | 25.70% | 73.04M | 13G | Nov 12, 2025 ↗ |
| Darsana Capital Partners LP | 8.80% | 25.00M | 13G | Nov 14, 2025 ↗ |
| Sculptor Capital LP | 7.39% | 21.00M | 13G | Feb 13, 2026 ↗ |
| BlackRock, Inc. | 6.20% | 17.74M | 13G | Jan 21, 2026 ↗ |
| Sessa Capital (Master), L.P. | 5.60% | 15.92M | 13G | Feb 17, 2026 ↗ |
| Sachem Head Capital Management LP | 5.46% | 15.56M | 13G | May 15, 2026 ↗ |
InsidersForm 4
| Insider | Role | Shares | % outstanding | Filed |
|---|---|---|---|---|
| Michael B. Jr. Petras | director, officer: Executive Chairman | 4.37M | 1.53% | Aug 19, 2026 |
| Alton Shader | director, officer: Chief Executive Officer | 375.9K | 0.13% | May 27, 2026 |
| Michael P. Rutz | officer: President of Sterigenics | 334.3K | 0.12% | Aug 11, 2026 |
| Alexander Dimitrief | officer: Former SVP, GC and Sec. | 312.0K | 0.11% | Apr 2, 2026 |
| Jonathan M. Lyons | officer: Sr. Vice President, CFO | 217.3K | 0.08% | Aug 7, 2026 |
| Ann R. Klee | director | 140.9K | 0.05% | May 27, 2026 |
| Sean Laurence Cunningham | director | 95.8K | 0.03% | May 27, 2026 |
| Ruoxi Chen | director | 95.8K | 0.03% | May 27, 2026 |
| James Neary | director | 95.8K | 0.03% | May 27, 2026 |
| Vincent K. Petrella | director | 95.8K | 0.03% | May 27, 2026 |
5 people have not refiled in the last 18 months (872.6K shares), so they are not in the figure above
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Aug 17, 2026 | Michael B. Jr. Petrasdirector, officer: Executive Chairman | Sale · 2 lots | 1,144,515 | $18.50 | 4,367,305 |
| Aug 7, 2026 | Michael P. Rutzofficer: President of Sterigenics | Sale | 150,000 | $18.84 | 334,279 |
| May 13, 2026 | GTCR Investment Xi LLCdirector, 10 percent owner: | Sale | 12,735,301 | $15.17 | 0 |
| May 13, 2026 | Warburg Pincus & Co.director, 10 percent owner: | Sale | 19,102,952 | $15.17 | 0 |
| Mar 6, 2026 | GTCR Investment Xi LLCdirector, 10 percent owner: | Sale | 10,000,000 | $15.27 | 12,735,301 |
| Mar 6, 2026 | Warburg Pincus & Co.director, 10 percent owner: | Sale | 15,000,000 | $15.27 | 19,102,952 |
| Dec 8, 2025 | Michael B. Jr. Petrasdirector, officer: Chairman & CEO | Sale · 3 lots | 750,000 | $16.45 | 552,790 |
| Dec 3, 2025 | GTCR Investment Xi LLCdirector, 10 percent owner: | Sale | 6,480,000 | $16.33 | 22,735,301 |
| Dec 3, 2025 | Warburg Pincus & Co.director, 10 percent owner: | Sale | 9,720,000 | $16.33 | 34,102,952 |
| Nov 10, 2025 | Warburg Pincus & Co.director, 10 percent owner: | Sale | 18,000,000 | $15.65 | 43,822,952 |
CongressHouse and Senate disclosures
Not reported.