Took a look at the ownership structure for SEACOR Marine (SMHI). Institutions hold about 44% of the shares, so the price is going to be pretty sensitive to their trading activity. BlackRock is currently the largest single shareholder at 5.7%. Insiders own a reasonable amount ($38m worth) which implies some alignment with shareholders, but they have sold recently. Retail investors hold 37%. Overall control is spread out, with the top 18 shareholders owning 51% combined.