** Shares of Tecan TECN.S rise 12% after the Swiss laboratory equipment producer reported H1 results and announced a share buyback of up to CHF 120 mln ($148 mln)
** H1 sales decline of 5.9% in CHF was slightly better than expected, Vontobel says, pointing to first signs of market improvement in Q2
** Analysts from Zürcher Kantonalbank also say the results have a clearly positive undertone
** However, the EBIT margin was historically low at 5.3%, pressured by a weak Life Sciences business, FX headwinds and U.S. tariffs, among others, Vontobel says
** The buyback programme will be launched on August 13 and completed no later than August 12, 2027, Tecan says
($1 = 0.8098 Swiss francs)
(Reporting by Bernadette Hogg)
((bernadette.hogg@thomsonreuters.com))