Masimo (MASI) shares soared 8.7% in the last trading session to close at $121.42. The move was backed by solid volume with far more shares changing hands than in a normal session. This compares to the stock's 8.5% loss over the past four weeks.The sharp upsurge in Masimo's shares can be attributed to the surprising news regarding the company's newly elected Board of Directors. On Sept. 19, per a public statement issued from Politan, activist investor Quentin Koffey, and his Politan Capital Management group’ ...