The top after-market NYSE losers on Monday are: Ennis, Health Management Associates, Precision Drilling, Emulex, Callon Petroleum, Endeavour Silver, OMNOVA Solutions, and Venoco.

Ennis, Inc. (NYSE:EBF) shares plunged 10.42 percent to $17.97 in post market trading session after the company said its fourth quarter net profit remained flat with last year. The company reported net income of $9.82 million or $0.38 per share compared to $9.83 million or $0.38 per share in the same quarter last year.

Health Management Associates, Inc. (NYSE:HMA) shares declined 3.75 percent to $10 in aftermarket trading session. The hospitals operator reported first quarter net income of $55.5 million or $0.22 per share compared to $46.9 million or $0.19 per share in the same quarter last year.

Precision Drilling Corp. (NYSE:PDS) shares declined 3.47 percent to $15 in post market trading session.

Emulex Corp. (NYSE:ELX) shares declined 3.38 percent to $10 in post market trading session. The company swung to third quarter net loss of $18.6 million or $0.21 per share compared to net income of $13.3 million or $0.16 per share in the same quarter last year.

Callon Petroleum Co. (NYSE:CPE) shares declined 2.39 percent to $6.53 in aftermarket trading session. The company announced that its first quarter 2011 results of operations will be released on Monday afternoon, May 9, 2011.

Endeavour Silver Corp. (NYSE:EXK) shares declined 2.38 percent to $11.06 in post market trading session.

OMNOVA Solutions Inc. (NYSE:OMN) shares declined 2.23 percent to $8.32 in aftermarket trading session.

BancorpSouth, Inc. (NYSE:BXS) shares declined 2.15 percent to $14.99 in aftermarket trading session. The company swung to first quarter net loss of $0.49 million or $0.01 per share compared to first quarter net income of $8.4 million or $0.10 per share last year.

Venoco, Inc. (NYSE:VQ) shares declined 1.85 percent to $16.46 in aftermarket trading session.

Nyse Silver New york city New York