This is historic:

Alphabet, $GOOGLX , has accounted for 19.4% of the #S&P 500's YTD gain, the most among any stock.

This comes as the company has added + $1.3 trillion in market cap this year.

#Nvidia , $NVDAX , has had the 2nd-largest impact at +16.0%, or +$1.05 trillion.

This is followed by #Broadcom , $AVGOX , and #Microsoft , $MSFT, which delivered +$520 billion and +$380 billion, respectively.

As a result, the top 10 #stocks have accounted for 59.4% of the S&P 500's YTD gain.

In other words, the remaining 490 stocks have accounted for just 40.6% of the S&P 500's rally.

Big tech is all that matters