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Pro Analysis

S&P 500's breach of key 2,100 level has chart experts worried

Traders work on the floor of the New York Stock Exchange.
Daniel Acker | Bloomberg | Getty Images
Traders work on the floor of the New York Stock Exchange.

The S&P 500's seventh-straight loss was especially worrisome to traders who follow charts because the benchmark closed below 2,100.

Many of them predict deeper losses ahead if the index can't bounce quickly back above this level before the week closes out.

S&P 500 3 years:

Source: FactSet

This level became key to the market after the S&P 500 first passed it in early 2015 and then struggled to break meaningfully above it for almost the next year and a half. After the benchmark rallied clearly above 2,100 in July, this key level of resistance then became key support.

CNBC PRO asked Wall Street technical analysts for their current take on the prospects for the market and the next important support levels.

Here is what they see.