Karsten S.A. Announced earnings results for the first quarter ended March 31, 2021. For the first quarter, the company announced sales was BRL 102.068 million compared to BRL 79.729 million a year ago. Operating income was BRL 14.101 million compared to BRL 16.565 million a year ago. Net income was BRL 9.021 million compared to BRL 13.892 million a year ago.