** Rossari Biotech ROSB.NS rises as much as 4.5% to 690.3 rupees, highest since August 6
** Specialty chemicals maker posts 4.4% y/y rise in consolidated net profit in September quarter; rev from ops jumps 18%
** Company's board approves additional investment of $8 million in one or several tranches in its Saudi Arabia unit to enhance manufacturing, sales of chemicals
** ROSB last up 2.1%, taking YTD losses to 15%
(Reporting by Bharath Rajeswaran in Bengaluru)
((bharath.rajeswaran@thomsonreuters.com; +91 9769003463;))