Diversification of ETFs with single stock of ETF vendor

Hello,

I'm curious, I have about 75% of my portfolio in iShares ETFs, modeling a sort of Boglehead 3 fund portfolio. I like to purchase single stocks in the other 25%. I'm wondering, is there extra risk involved with purchasing Blackrock stock? From an overall correlation perspective, I could see the ETFs and Blackrock being somewhat correlated, however if the broader market performs much better that Blackrock, or Blackrock somehow goes bellyup, does my portfolio have some extra risk?

Thanks!

Submitted November 21, 2017 at 11:36AM by weh72 http://ift.tt/2iDE3XH