General Motors (GM, news, chart, volatility) was halted, news pending, but has now resumed trading. The automaker posted a loss of $7.35 per share, which is $3.65 worse than estimates. Revenues also missed: $37.9 billion vs. $39.4 consensus. Stock is down 75 cents, or 15.6 percent, to $4.04 a share and falling to session lows post earnings. 29,000 GM puts and 8,715 calls have traded on the session.