"While the top-line percentage was unchanged, plans with more than $20 billion in assets increased incorporation of ESG factors by 136% from 2013 to 2017, according to the findings. The authors note that these plans now have the highest rate of incorporation at 78%, compared to only 30% for the smallest funds. ESG adoption across all plan sizes has increased 68% since the firm′s first such survey in 2013."

[COMMENTARY] I wonder if one reason larger plans outpace smaller plans in utilizing ESG criteria has to do with staffing and resources of the plan managers?
Larger Plans Continue to Outpace Smaller Plans in Incorporating ESG Factors, by Ted Godbout, NAPA, USA.