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Shares of Glaukos (NYSE: GKOS) plummeted 21.3% in August, according to data from S&P Global Market Intelligence. For context, the S&P 500 index, including dividends, fell 1.6% last month.
The California-based company is involved in developing and marketing surgical devices and drugs to treat glaucoma.
As a result of its August pullback, Glaukos stock's 2019 performance is trailing that of the broader market. It's up 15.7% through Sept. 6, while the S&P 500 has returned 20.5% over this period.