Shares of Expedia ( EXPE - Get Report) sank after the bell on Thursday as the online travel agency reported first-quarter results that were below Wall Street expectations. The company's net income plummeted 51% to $23.3 million, or 6 cents a share, from $48 million, or 14 cents a share, a year earlier. On an adjusted basis, the profit was $57 million, or 15 cents a share. According to Thomson First Call, analysts anticipated earnings of 22 cents a share. Expedia's sales rose 2% to $493.9 million, missing analysts' projection of $543.8 million. The company also said it plans to buy back up to 20 million shares. Expedia sank $3.26, or 17%, to $16.40 in after-hours trading.

51Job ( JOBS - Get Report) climbed as the Chinese employment agency reported sharply higher earnings that beat Wall Street's forecast. Earnings rose 189% from a year ago to $3.3 million, or 12 cents an American depositary share. Excluding stock-options costs and foreign-currency losses, 51Jobs earned 15 cents per ADS in the most recent quarter, beating analysts' estimate of 9 cents. First-quarter revenue rose 21% to $21.5 million, matching Wall Street's expectation. 51Job said print-advertising revenue rose 14% to $13.3 million, while online recruitment revenue grew 53% to $6.1 million.

For the second quarter, 51Job expects to earn 13 cents to 15 cents a share on revenue of $21.2 million to $22.5 million. Analysts had forecast earnings of 11 cents a share on sales of $21.3 million. Shares rose $2.35, or 9.3%, to $27.70 in late trading.

Shares of Threshold Pharmaceuticals ( THLD) nosedived after the company said the Food and Drug Administration put its trial for a benign prostatic hyperplasia treatment on hold. The move comes after abnormalities observed in liver-enzyme levels in six subjects. The abnormalities included three serious adverse events observed at three months of dosing in the Phase III European/Canadian clinical trial and three additional cases of elevated liver enzymes that occurred in other ongoing clinical trials. The company is amending the European/Canadian trial to discontinue dosing. Under the partial clinical hold, a current Phase II trial will continue to completion. Shares sank $10.56, or 75%, to $3.44 in late trading.

Shares of H&E Equipment Services ( HEES - Get Report) jumped after the company blew past Wall Street's first-quarter forecast and raised its full-year guidance. For the first quarter, the equipment provider earned $9.9 million, or 29 cents a share, up sharply from $951,000, or 4 cents a share, a year earlier. The earnings more than doubled analysts' average forecast of 14 cents. Revenue rose to $182.2 million from $128.6 million, surpassing analysts' projection of $149.9 million. The company said it benefited from strong demand for construction equipment, as well as higher margins.

H&E increased its full-year earnings forecast to $1.25 to $1.45 a share from its previous view of $1 to $1.15. The company boosted its revenue projection to $710 million to $740 million from $675 million to $690 million. Analysts predict earnings of $1.14 a share and revenue of $705.8 million. Shares advanced $4.85, or 13%, to $41.55 in after-hours trading.

Big 5 Sporting Goods ( BGFV - Get Report) shares moved higher after the company reported better-than-expected first-quarter results. The sporting-goods retailer posted earnings of $5.9 million, or 26 cents a share, including charges of $1.8 million related to distribution-center transition costs. Sales totaled $207.2 million, while same-store sales rose 5.3%. Analysts anticipated earnings of 18 cents a share and sales of $202.6 million. A year earlier, Big 5 earned $6.4 million, or 28 cents a share, on sales of $190.1 million.

Looking ahead, Big 5 forecast second-quarter earnings of 23 cents to 27 cents a share, and full-year earnings of $1.23 to $1.33 a share. The projections include stock-option costs of 2 cents and 6 cents a share, respectively. Wall Street expects earnings of 30 cents a share for the second quarter and $1.29 for the full year.

Big 5 also increased its annual dividend to 36 cents a share from 28 cents and said it may buy back up to $15 million of stock. Shares rose $1.32, or 6.5%, to $21.70 after hours.