| Rank | Name | Market Cap | Price | Today | Price (30 days) | Country |  | 1 |  | $2.50 B | $30.10 | 0.63% | 🇺🇸 USA | | 2 |  | $0.88 B | $5.35 | 4.09% | 🇺🇸 USA | | 3 |  | $0.78 B | $13.71 | 2.35% | 🇺🇸 USA | | 4 |  | $0.49 B | $2.51 | 1.18% | 🇺🇸 USA | | 5 |  | $0.42 B | $0.70 | 2.11% | 🇳🇴 Norway | | 6 |  | $0.17 B | $1.35 | 3.85% | 🇺🇸 USA | | 7 |  | $0.11 B | $3.36 | 3.07% | 🇺🇸 USA |
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List of the largest pollution control and treatment companies by Market Cap. Only specialty pollution control and treatment companies companies that are listed on stock exchanges are shown.