Concerns about the faltering Ukrainian economy weighed the markets down to a lower open with the Dow falling 61 points to 16,468. Nasdaq lost 8 points to 4,129.

On the upside 

Office Depot (NYSE: ODP) reported a smaller than expected loss for the first quarter and announced plans to close at least 400 stores.

Forest Oil (NYSE: FST) will merge with Sabine Oil & Gas in an all-stock deal.

Vivus (Nasdaq: VVUS) narrowed first quarter losses as revenue soared.

On the downside 

The lock-up period on approximately 480 million Twitter (NYSE: TWTR) shares expired.

A Seeking Alpha contributor expects Capstone Turbine (Nasdaq: CPST) stock to continue falling.

Greenlight Capital’s David Einhorn has taken a short position on Athenahealth (Nasdaq: ATHN) saying that the stock could plunge 80%.

In the broad market, declining issues outpaced advancers by a margin of more than 5 to 3 on both the NYSE and on Nasdaq. The broader S&P 500 lost 8 points to 1876. Bitcoin eased $0.56 or 0.13% to $427.83.