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 September 25, 2020.  The total market capitalization of these five technology stocks equals $6.7 trillion, about 24% of the total capitalization of the S&P 500 ($28 trillion).

(1) Apple ($1.92 trillion) —       +52.9% YTD

(2) Microsoft ($1.57 trillion) — +31.8%

(3) Amazon ($1.54 trillion) —   +67.5%

(4) Alphabet ($982 billion) —     +7.4%

(5) Facebook ($727 billion) —  +24.2%

Also,

Berkshire Hathaway ($502 billion)  —  -7.2%

Tesla ($380 billion)   —               +387%

Netflix ($213 billion) —               +49.2%

Zoom ($141 billion) —                  +630%

S&P 500 —   +2.1%

DJIA     —        -4.8%

Nasdaq  —  +21.6%