The markets closed modestly lower with the Dow slipping 15 points to 18,038 over concerns about the Greek economy after parliament failed to elect a new president. Nasdaq held steady at 4,806.

On the upside

Rite Aid (NYSE: RAD) will offer a rewards program for its wellness+ members.

Bargain hunters lifted shares of PhotoMedex (Nasdaq: PHMD).

Shares of Advaxis (Nasdaq: ADXS) extended its gains.

On the downside

Retreating crude oil prices weighed down shares of Resolute Energy (NYSE: REN).

Twitter (NYSE: TWTR) insiders, including co-founder Evan Williams, sold nearly 1.2 million shares of the microblogging site.

Investors locked in profits on Freeport-McMoRan (NYSE: FCX).

In the broad market, advancing issues outpaced decliners by a margin of 7 to 5 on the NYSE while advances barely edged out decliners by a slim margin on Nasdaq. The broader S&P 500 added a point to 2090. Bitcoin eased $2 to $313.