Bill Gates acquired 223 Thousand Psychemedics shares worth $577 Thousand. That's 0.00% of their equity portfolio (22nd largest holding). The investor owns 3.88% of the outstanding Psychemedics stock. Bill Gates acquired their 223 Thousand shares in Q3 2007. So far they never sold any shares in the company. The investor's estimated purchase price is $4.21 Million, resulting in a loss of 86%.