| Rank | Name | Market Cap | Price | Today | Price (30 days) | Country |  | 1 |  | $2.60 B | $31.30 | 1.43% | 🇺🇸 USA | | 2 |  | $0.81 B | $4.98 | 1.39% | 🇺🇸 USA | | 3 |  | $0.81 B | $14.20 | 0.07% | 🇺🇸 USA | | 4 |  | $0.44 B | $2.23 | 7.73% | 🇺🇸 USA | | 5 |  | $0.38 B | $0.64 | 1.12% | 🇳🇴 Norway | | 6 |  | $0.18 B | $1.40 | 2.19% | 🇺🇸 USA | | 7 |  | $0.11 B | $3.36 | 3.07% | 🇺🇸 USA |
|---|
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.