Below is a look at the change in market cap experienced by the S&P 500 and each of its eleven sectors in the first half of 2017. The members of the S&P 500 had a combined market cap of $20.49 trillion at the start of the year, and they added $1.62 trillion in the first half. This leaves the S&P 500's current market cap at $22.11 trillion.
Of the eleven sectors, Technology gained the most in market cap at roughly $680 billion, moving from $4.26 trillion at the start of the year up to $4.93 trillion at the end of June. Health Care, Consumer Discretionary, Industrials, and Financials all added more than $150 billion in market cap.
Only two sectors lost market cap - Telecom and Energy. The Energy sector lost the most in market cap in the first half at -$177.6 billion.
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