"The year started well across the group with strong sales in every platform,” said Max Vermorken SigmaRoc PLC’s (LON:SRC) trading in the first four months of the year has been ahead of internal expectations. The construction materials company, in a statement ahead of today’s AGM, said that it generated £36.7min of revenue during the first quarter and that marked a 12% increase on the same period last year. Margins and cash generation continued to be strong in the quarter, SigmaRoc added. It highlighted that the performance was driven by both organic growth and the contribution of operations acquired last year. Momentum continued into the second quarter, it noted, with further like-for-like growth for the month of April.