Having a strong start to the day on Wall Street are today’s midday gainers Vanda Pharmaceuticals Inc. (NASDAQ:VNDA), Celladon Corp (NASDAQ:CLDN) and SunPower Corporation (NASDAQ:SPWR). This Wednesday’s worst performers midday are dELiA*s, Inc. (NASDAQ:DLIA), Zulily Inc (NASDAQ:ZU) and Tibco Software Inc. (NASDAQ:TIBX).

chart_1 (32) tibco software

Vanda Pharmaceuticals Soars

Vanda Pharmaceuticals Inc. (NASDAQ:VNDA) surged +23.44 earlier in the day today, rendering it this Wednesday’s top midday gainer on Wall Street. A new Q1 pick for billionaire investor John Paulson, the biopharmaceutical firm said yesterday that its Marketing Authorization Authentication for oral HETLIOZ tablets had been accepted for evaluation by the European Medicines Agency. Vanda took a big hit last month after reporting its Q1 results, rendering today’s jump an especially important piece of news for company investors.

Celladon Corp (NASDAQ:CLDN) is up an impressive +22.78% midday. At the start of the week, the biotech company announced the appointment of a new President and CFO. Thomas Steyer initiated a 270,000-share position in Celladon last quarter.

Up +8.34%, SunPower Corporation (NASDAQ:SPWR) takes the third spot on today’s list of midday gainers. News broke today that NV Energy has selected the company to build a power system at Nellis Air Force Base in Nevada. Likewise, the U.S. has set new import duties on Chinese solar products, thus taking some of the pressure off of the solar company, which caught Leon Cooperman’s eye for investment in Q1.

Tibco Software slips

dELiA*s, Inc. (NASDAQ:DLIA) dipped -6.87% today, as it continues to suffer the ramifications of its CFO’s exit. While company executives said they were “encouraged” by Q1 numbers, the teen apparel retailer and Tiger Global pick continues to struggle, its price down -29.52% YTD.

Zulily Inc (NASDAQ:ZU), another Tiger Global Pick, is having a rough day as well, its price down -6.46% midday. The online retailer and flash sales platform has struggled on the market in recent weeks, its price declining -30.56% in the past month alone.

Tibco Software Inc. (NASDAQ:TIBX) slipped -5.48% – likely the result of the company’s warning yesterday that revenue and profit for its fiscal Q2 will miss analysts’ expectations. Its official results will be revealed on June 19th. In the meantime, Tibco investors, including Wall Street magnate George Soros, will have to wait and see how things turn out.