The partners were Charles Richard Clark (c.1787-1841) and Robert Todd (bapt.1764-1837).  The latter – who was probably the son of Edward Todd, a ‘patten maker’ – had been a partner in Longden, Binney & Co, a merchant at Campo Lane.   After the dissolution of this enterprise in 1807, Todd joined one of his former partners (William Justice) and Charles R.  Clark.  They formed Justice, Todd, Clark & Co, which in 1811 was listed as a merchant and manufacturer.  However, no information was supplied on its address or its manufactures.  Justice later withdrew and the firm became known as Clark & Todd, a merchant and steel refiner at Forge Lane.  It was dissolved in 1820, when the ‘subscriber’, Clark retired.  This left Robert Todd and Jonathan Marshall as partners in Clark & Todd.  

By 1828, the enterprise was styled as Todd & Co (late Clark & Todd) and classed as a general merchant and steel converter and refiner, which manufactured ‘solely from foreign iron’.  In 1832, Todd announced the move of his ‘steel establishment’ from Orchard Street to St James’s Street.  Robert Todd, ‘a true Christian’, died after a short illness on 26 April 1837, aged 73 (Sheffield Independent, 3 June 1837).   Charles Richard Clark died on 22 February 1841 (aged 54) at his residence at Albany Street, Regent’s Park, London.  He was described as ‘late of New York’ and formerly of Sheffield (Sheffield Independent, 6 March 1841).