Global economic concerns sparked by the collapse of the Chinese market sent stocks plummeting during the midday with the Dow crashing 366 points to 17,058. Nasdaq collapsed 126 points to 4,880.

On the upside

General Steel Holdings (NYSE: GSI) elected five members to its board, appointed Friedman LLP as the independent registered public accounting firm, ratified an amendment to the 2008 Equity Incentive Plan and approved executive officer compensation.

FuelCell Energy (Nasdaq: FCEL) will install a 5.6 megawatt fuel cell power integration system at Pfizer's research and development facility in Groton, Connecticut.

3D Systems (NYSE: DDD) introduced its ProX DMP 320 direct metal 3D printer.

On the downside

Qunar Cayman Islands (Nasdaq: QUNR) named Zhenyu Chen to the position of chief executive officer, Qiang Zhang to the position of chief operating officer and Xiaolu Zhu to the position of chief financial officer.

Investors continued to lock in profits on Perion Networks (Nasdaq: PERI).

Zacks Equity Research recommended Axovant Sciences (NYSE: AXON) as a solid investment in biomedical sector but the stock price fell.

In the broad market, declining issues outpaced advancers by a margin of nearly 6 to 1 on both the NYSE and on Nasdaq. The broader S&P 500 plummeted 46 points to 1,996. Bitcoin rose $5 to $432.