| Rank | Name | Market Cap | Price | Today | Price (30 days) | Country |  | 1 |  | $2.55 B | $30.68 | 0.23% | 🇺🇸 USA | | 2 |  | $0.92 B | $5.60 | 6.06% | 🇺🇸 USA | | 3 |  | $0.79 B | $13.90 | 0.29% | 🇺🇸 USA | | 4 |  | $0.53 B | $2.73 | 0.37% | 🇺🇸 USA | | 5 |  | $0.41 B | $0.68 | 2.80% | 🇳🇴 Norway | | 6 |  | $0.19 B | $1.44 | 5.11% | 🇺🇸 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.