After-Hours Movers Led By Pioneer Energy, Weibo & Habit Restaurants

Pioneer Energy Services Corp. PES picked up nearly 8 percent in the extended session Tuesday, changing hands recently at about $5.33 a share. The Texas-based oil-field services company closed down 7 percent compared with its price of a week ago.

Mercer International Inc. MERC rose more than 6 percent to $14.64 in Tuesday's extended session. The Canadian-based pulp manufacturer hit a 52-week high on Monday of $14.95.

Anthera Pharmaceuticals Inc. ANTH picked up more than 6 percent to $5.80 after hours Tuesday. Shares of Anthera had fallen sharply on Monday on no apparent news.

Engility Holdings Inc. EGL increased more than 4 percent, changing hands recently at $32.99. The government services provider has lost about 30 percent in value since posting fourth-quarter results last week.

Global Cash Access Holdings Inc. GCA gained more than 4 percent in late trading to about $7.60 after the casino-industry service company posted fourth-quarter results.

Unit Corp. UNT rose about 4 percent to $27.23 in late trading after closing down nearly 6 percent. The Oklahoma drilling company is off 12 percent in the past five trading days.

CONN'S Inc. CONN ticked up more than 2 percent to $23.99 in the extended session after closing down more than 7 percent. The Texas-based consumer finance and retailing company on Thursday said same-store sales for February fell 5.8 percent.

Sunoco Logistics Partners L.P. SXL dropped more than 5 percent to $41 a share in the extended session. After the bell the company launched a 13.5 million-unit offering to help repay outstanding amounts on its $1.5 billion revolving credit facility.

Weibo Corp. WB declined more than 6 percent to $13.92 a share after the Chinese social media platform provider posted fourth-quarter results.

Habit Restaurants Inc. HABT sank nearly 7 percent to $32.10 after posting its first quarterly earnings report since going public in November. The company forecast same-store sales growth of 2.5 percent to 3 percent, versus growth of 13 percent in the recent quarter.

Merrimack Pharmaceuticals Inc. MACK dropped nearly 5 percent to $10.72 a share after closing down 6 percent. The stock hit a 52-week high last week of $12.50.