Mako Surgical Corp. (MAKO): MAKO develops proprietary advanced robotic arm solutions and orthopedic implants used in minimally invasive orthopedic knee procedures. Insiders currently hold 3.4 million or 8.2% of outstanding shares. On Friday, Director Frederic Moll purchased 5,000 shares for $0.13 million. This is unusual in that insider buying is relatively uncommon at MAKO, as in the past year insiders purchased only an additional 6,700 shares (selling 616,736 shares). MAKO currently generates losses and has negative cash flow, and it trades at 10.2 P/B compared to the 5.6 average for the medical instruments group.