Falling crude oil prices sent the markets tumbling during the midday with the Dow plummeting 160 points to 17,529. Nasdaq fell 28 points to 5,100.

On the upside

Shares of Hutchinson Technology (Nasdaq: HTCH) extended its gains.

Global-Tech Advanced Innovations (Nasdaq: GAI) received an offer from chief executive John C.K. Sham to take the company private for a premium of $8.75 per share in cash.
 
Shares of A.M. Castle (NYSE: CAS) rose ahead of its earnings release tomorrow.
 
On the downside

Falling crude oil prices weighed down shares of Legacy Reserves (Nasdaq: LGCY) and Penn Virginia (NYSE: PVA).

Mizuho initiated coverage of AAC (NYSE: AAC) with a Neutral rating.

Shares of Twitter (NYSE: TWTR) continued falling.

In the broad market, declining issues outpaced advancers by a margin of nearly 2 to 1 on the NYSE and by nearly 7 to 3 on Nasdaq. The broader S&P 500 dropped 12 points to 2090. Bitcoin added $2 to $282.