Morning Market Losers

Regional Management

shares fell 28.69% to $15.76 after the company reported Q1 results. The company's GAAP net income fell 17.1% to $5.6 million. Power Integrations

declined 28.35% to $41.86 after the company reported downbeat Q1 results and issued a weak Q2 revenue outlook. Vistaprint NV

shares fell 18.98% to $43.28 on weaker-than-expected quarterly results. Auxilium Pharmaceuticals

shares tumbled 15.20% to $23.20 after the company cut its 2014 forecast. Auxilium Pharma now expected FY14 revenue of $380 million to $420 million, versus its earlier outlook of $450 million to $490 million. Big 5 Sporting Goods

declined 12.73% to $13.30 after the company reported Q1 results and issued a weak Q2 earnings forecast. Twitter

shares slipped 11.87% to $37.56 after the company posted a wider first-quarter net loss. The company also reported weaker-than-expected active monthly users. Twitter's adjusted profit came in flat on a per share basis, versus analysts' expectations for a loss of $0.03 per share. Express Scripts Holding Company

declined 6.98% to $66.05 after the company reported a downbeat first-quarter profit and cut its earnings outlook for 2014. eBay

shares fell 6.09% to $51.22 after the company issued a weak forecast. However, the company reported upbeat first-quarter results. HD Supply Holdings

declined 2.18% to $26.13 after the company announces a secondary offering of 30 million shares by selling stockholders.