LinkedIn Corp., Activision Blizzard Corp., PPL Corp. and Calpine Corp. are among the stocks that could be actively traded Friday.

LinkedIn (LNKD) reported fourth quarter net income to common shares of $6.9 million or $0.06 per share, up from $1.6 million or $0.03 per share last year. Excluding items, adjusted earnings for the quarter was $13.3 million or $0.12 per share. On average, 14 analysts polled by Thomson Reuters expected the company to earn $0.07 per share for the quarter.

Activision Blizzard's (ATVI) profit for the quarter was $99 million or $0.08 per share, compared to a loss of $233 million or $0.20 per share last year. Activision Blizzard's profit for the quarter was $99 million or $0.08 per share, compared to a loss of $233 million or $0.20 per share last year.

PPL Corp (PPL) is forecast to report fourth quarter earnings per share of $0.62 on revenues of $2.71 billion.

Calpine Corp. (CPN) announced its net loss for the fourth quarter narrowed to $13 million or $0.03 per share from $24 million or $0.05 per share last year. Analysts polled by Thomson Reuters expected the company to report loss of $0.01 per share.