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 2, 2020.  The total market capitalization of these five technology stocks equals $6.8 trillion, about 24% of the total capitalization of the S&P 500 ($28 trillion).

(1) Apple ($1.93 trillion) —       +54.0% YTD

(2) Microsoft ($1.56 trillion) — +30.8%

(3) Amazon ($1.56 trillion) —   +69.1%

(4) Alphabet ($994 billion) —     +8.7%

(5) Facebook ($741 billion) —  +26.7%

Also,

Berkshire Hathaway ($506 billion)  —  -6.5%

Tesla ($387 billion)   —               +396%

Netflix ($222 billion) —               +55.5%

Zoom ($137 billion) —                  +609%

S&P 500 —   +3.6%

DJIA     —        -3.0%

Nasdaq  —  +23.4%