Some researchers have looked at the effect of passive investors on corporate governance[1] :
> Still, these funds retain the power of voice, the ability to exert shareholder influence on management and governance-related proposals. But critics say passively invested funds, with their lower fees, lack the resources and often the will to monitor their large and diverse portfolios. The Economist calls them “lazy investors.”...
> My fellow researchers and I set out to test that claim. In our forthcoming research paper in The Journal of Financial Economics, we show that passive institutions do indeed positively shape firms’ governance policies. Our findings run contrary to the presumption that passive investors lack the willingness and ability to influence firms’ policy choices.
> The results of our analysis suggests that passive investors affect firm governance in several ways. For example, we found that an increase in passive ownership is associated with a statistically significant increase in the share of independent directors on firms’ boards. In addition, firms with higher passive investor ownership were more likely to remove firm takeover defenses (for example, so-called “poison pills” and limitations on shareholders calling special board meetings). They were also less likely to have the unequal voting rights of a dual-class share structure.
[1] https://hbr.org/2016/05/research-index-funds-are-improving-c...