Most of the decline came in S & P 500 stocks, which lost a combined $8.2 trillion.
Amazon, Apple, Alphabet, Microsoft, Tesla, Meta Platforms and Nvidia lost a combined $4.95 trillion in market capitalization in 2022.
Of those seven megacaps, losses ranged from Amazon's plunging market value of $844 billion to Nvidia's decline of $388 billion.
Broken down by the S & P 500's 11 major industry groups, information technology's market value slid $3.49 trillion in 2022, trailed by consumer discretionary stocks, dominated by Amazon, Tesla, Home Depot, Nike, Lowe's and Target, at $1.91 trillion.
Silverblatt used the S & P U.S. Broad Market Index, consisting of roughly 2,500 stocks, to measure the total market decline of $10 trillion.