Big Corporate Whale Hunting

Board interlocks in the S&P 500: which companies share directors, who sits on more than one board, and who owns the most shares.

Every S&P 500 company, its board and the companies it shares directors with →

Who owns the S&P 500? See the biggest institutional holders →

View the interactive S&P 500 director-network graph →

See every S&P 500 company sized by market cap (as of 21 Oct 2026) →

See market cap against employees, one stick figure per 10,000 →

Read the blog post: how connected is the S&P 500? →

Read the blog post: who employs the S&P 500? →

Every director and officer, and the boards they sit on →

I conducted a comprehensive analysis of the S&P 500 companies, focusing on the relationships between them through their board of directors. By examining the connections among these directors, I aimed to shed light on the extent of collaboration and interaction within this group of influential corporations.

Through meticulous research and data mapping, I uncovered a network of director affiliations that demonstrated how individuals from different companies often serve on each other's boards. This phenomenon highlights a level of cross-pollination of ideas and strategies between these corporations.

The findings underscore the significance of these interconnections in facilitating business interactions, sharing industry insights, and potentially influencing corporate decisions. While not necessarily groundbreaking, this analysis provides a nuanced understanding of the ways in which these S&P 500 companies are linked through their leadership structures.

By recognizing the existence of these directorial relationships, businesses can potentially leverage them for mutual benefit, such as collaborative ventures or strategic alliances. Overall, the study adds a layer of insight into the functioning of these prominent companies and their interactions within the broader business landscape.