The markets opened mixed with Dow slipping 28 points to 18,006 while Nasdaq gained 22 points to 5,017 as investors weighed upbeat earnings against a possible Greek default.

On the upside

Lam Research (Nasdaq: LCRX) reported higher third quarter earnings and revenue that surpassed analyst expectations.

First quarter earnings fell for Fortinet (Nasdaq: FTNT) but the results were better than expected.

Teva Pharmaceutical (Nasdaq: TEVA) offered a premium of approximately $40 billion to acquire Mylan (Nasdaq: MYL).

On the downside

Concerns that Greece will soon default weighed down shares of National Bank of Greece (NYSE: NBG).

Harley-Davidson (NYSE: HOG) reported higher first quarter earnings but revenue slipped and the company lowered its shipment outlook for 2015.

Novogen (Nasdaq: AMD) announced a private placement of approximately 51 million common shares.

In the broad market, advancing issues outpaced decliners by a margin of nearly 7 to 2 on both the NYSE and on Nasdaq. The broader S&P 500 added a point to 2102. Bitcoin added $1 to $223.