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The stock market is down slightly Thursday, with the Dow Jones Industrial Average down 0.19%, the Nasdaq down 0.02% and the S&P 500 down 0.08%. Today’s sole winner is a solar energy company selling two projects, while today’s loser is a technology developer that cut its quarterly revenue guidance on weak demand.

This is Thursday’s market winner and loser.

Biggest Winner

Shares of SunPower Corporation (NASDAQ: SPWR) are up 31.97% to $8.09 on trading volume of 6.5 million shares. The firm has sold two solar projects to MidAmerican Energy Holding Co., controlled by Berkshire Hathaway (NYSE: BRK-B) for about $2.5 billion. The 52-week high is $9.54.

Biggest Loser

Shares of Mellanox Technologies, Ltd. (NASDAQ: MLNX) are down 15.33% to $51.81 on trading volume of 4.6 million shares. The company, which develops data-management technology, cut its fourth-quarter sales projection from between $145 million and $150 million to just $119 million and $121 million. The 52-week low is $30.00.

Samuel Weigley

Follow him on Twitter: SWeigley