BRK and VOO have a correlation of 0.7 over the past 5 years. That's high enough that they have been relatively similar, but not so high that I would really say it "tracks" it.

Of course, no one knows the future so who knows if this will continue.

random web correlation calculator shows it has deviated since around May this year and is currently around 0.3

https://www.portfoliovisualizer.com/asset-correlations#analy...