China's growth concerns weigh down markets

Concerns about China's economic growth sent the markets tumbling to a sharply lower close with the Dow plummeting 179 points to 16,330. Nasdaq plunged 72 points to 4,756.

On the upside

Cemtrex (Nasdaq: CETX) received multiple orders for its 2500 Multi Gas Analyzer.

HD Wainwright initiated coverage of Conatus Pharmaceuticals (Nasdaq: CNAT) with a Buy rating and a price target of $15.

Clean Diesel Technologies' (Nasdaq: CDTI) chief technology officer Dr. Steve Golden will give a keynote speech at the 6th Annual Global Congress of Catalysis 2015.

On the downside

Concerns arose that the Federal Trade Commission may block the proposed merger between Office Depot (Nasdaq: ODP) and Staples (Nasdaq: SPLS).

Investors locked in profits on ANI Pharmaceuticals (Nasdaq: ANIP).

Intra-Cellular (NYSE: ITCI) will offer $300 million worth of common stock.

In the broad market, declining issues outpaced advancers by a margin of nearly 4 to 1 on the NYSE and by nearly 7 to 2 on Nasdaq. The broader S&P 500 plummeted 24 points to 1,942. Bitcoin added $1 to $228.