...+ We are assigning our '###-' long-term and 'A-3' short-term issuer credit ratings to U.K.-based commodities broker Marex Spectron Group Ltd. + The '###' group credit profile (GCP) balances our view of Marex Spectron's strong market position in a relatively small niche of commodities brokerage with its solid capitalization on a consolidated basis and limited risk appetite. + The stable outlook reflects our expectation that Marex Spectron will retain its position as a leading global commodities broker, adequate profitability, and conservative risk appetite. LONDON (S&P Global Ratings) July 12, 2018--S&P Global Ratings today assigned its '###-' long-term and 'A-3' short-term issuer credit ratings on UK.-based Marex Spectron Group Ltd., a leading global commodities broker. The outlook is stable. Marex Spectron Group Ltd. is a nonoperating holding company (NOHC). Through its operating subsidiaries, it provides a wide variety of voice and electronic execution, post-trade risk mitigation, and...