The markets opened mixed with the Dow rising 14 points to 18,132 while Nasdaq lost 9 points to 4,951 ahead of Federal Reserve chair Janet Yellen’s testimony before the Senate Banking Committee this morning.

On the upside

Shares of Biocept (Nasdaq: BIOC) continued climbing.

First Solar (Nasdaq: FSLR) and SunPower (Nasdaq: SPWR) engaged in advanced negotiations to form a yieldco joint venture.

All three centers in France that have been approved to implant Second Sight Medical Products’ (Nasdaq: EYES) Argus II Retinal Prosthesis System have successfully completed their first implants.

On the downside

Rosetta Resources (Nasdaq: ROSE) reported higher fourth quarter earnings but the results fell short of analyst expectations.

PDL BioPharma (Nasdaq: PDLI) disappointed with lower fourth quarter earnings that missed expectations by a wide margin.

Tallgrass Energy Partners (NYSE: TEP) priced its follow-on offering of 10 million common units at the discounted price of $50.82 per common unit.

In the broad market, advancing issues outpaced decliners by a margin of nearly 10 to 9 on the NYSE and by more than 10 to 9 on Nasdaq. The broader S&P 500 slipped 2 points to 2106. Bitcoin eased a fraction to $235.