The largest five stocks by market capitalization are substantially outperforming the S&P 500 and the Dow Jones Industrial Average (DJIA) Year-To-Date (YTD) as of October 23, 2020.  The total market capitalization of these five technology stocks equals $7.1 trillion, about 24% of the total capitalization of the S&P 500 ($29 trillion).

(1) Apple ($1.97 trillion) —  +56.7% YTD

(2) Microsoft ($1.64 trillion) — +37.1%

(3) Amazon ($1.60 trillion) —   +73.4%

(4) Alphabet ($1.11 trillion) —   +21.9%

(5) Facebook ($812 billion) —   +38.8%

Also,

Berkshire Hathaway ($508 billion)  —  -6.0%

S&P 500 —   +7.3%

DJIA     —        -0.7%

Nasdaq  —  +28.7%