Baystreet Staff - Wednesday, June 24, 2015 Casey's General Stores (CASY) improves as Nektar replaces company Casey's General Stores Inc (NASDAQ: CASY) shares picked up 1.1% to $96.27. The stock is being replaced on the S&P Small Cap 600 tomorrow by Nektar Therapeutics. Share volume totaled 63,000, compared to an all-day average of 285,000