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ProShares Short S&P500 vs State Street SPDR S&P 500 ETF Trust

Over the past year SH returned −13.0% and SPY returned +15.4%; their daily moves had a correlation of -0.99.

SH −13.0% SPY +15.4%Growth of $1, one year, split-adjusted
MetricSHSPY
Price$32.26$765.61
Market cap$960.2M$816.74B
Today+0.78%−0.74%
1 month0.0%−0.7%
6 months−17.0%+20.7%
Year to date−10.5%+12.3%
1 year−13.7%+16.3%
Revenue growth (YoY)——
Gross margin——
Net margin——
P/E (TTM)——
Price / sales——
Net cash——
Dividend yield3.67%0.99%
Volatility (60d)11.1%11.2%
Short % of float——
Next earnings——

Shading marks the stronger figure where one clearly exists (lower is better for valuation and volatility).