Institutional Investors Increase Stakes in SunOpta Despite Challenges Charles Schwab and other institutional investors have raised their holdings in SunOpta, with Schwab adding 15,049 shares in Q4, now owning 0.65% of the company. Meanwhile, insider selling activity continues, with SVP Bryan P. Clark recently selling 8,500 shares. SunOpta's stock remains volatile, trading near its 52-week low of $4.88.356