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OM Group, Inc. is a United States-based industrial company. The Company is engaged in serving global markets, including automotive systems, electronic devices, aerospace and defense, industrial and medical. It operates in three business segments: Magnetic Technologies, Battery Technologies and Specialty Chemicals. Its Magnetic Technologies segment develops, manufactures and distributes industrial-use magnetic materials and related products to an array of end markets, including automotive systems, electrical installation technology, industrial, retail and renewable energy. The Company's Battery Technologies segment provides batteries, battery management systems, and energetic devices for defense, space and medical markets. The Company's Specialty Chemicals segment develops, produces and supplies chemicals for electronic applications, industrial applications including coatings, composites and tire, and photomasks used by customers to produce semiconductors and related products.

Smart Sand, Inc., an integrated frac and industrial sand supply and services company, engages in the excavation, processing, and sale of sands or proppant for use in hydraulic fracturing operations in the oil and gas industry in the United States. It also provides proppant logistics services; and wellsite storage solutions through SmartSystems products and services. The company sells its products primarily to oil and natural gas exploration and production companies, oilfield service companies, and industrial manufacturers. Smart Sand, Inc. was incorporated in 2011 and is headquartered in Spring, Texas.

Special Opportunities Fund, Inc. is a close-ended balanced fund of funds launched and managed by Bulldog Investors, LLC. It invests in close-ended funds investing in public equity and fixed income markets. The fund employs a combination of value, opportunistic and special situations strategies to make its investments. It benchmarks the performance of its portfolio against the S&P 500 Index. The fund was previously known as Insured Municipal Income Fund, Inc. Special Opportunities Fund, Inc. was formed on February 18, 1993 and is domiciled in the United States.