Check out the companies making headlines after the bell Wednesday:
Citigroup's shares surged briefly after a credit rating agency affirmed the bank's long-term prospects. Citi has an "A" rating on its long-term issuer default rating, Fitch Ratings said Wednesday. Citi has solid capital and liquidity levels, Fitch said in a statement, as the financial titan works to make its balance sheet more efficient and become a "smaller, simpler and safer bank."
Shares of AmSurg inched higher, while Envision Healthcare Holdings sank, after the two agreed to merge in an all-stock deal. The combined physicians' services company would be worth $10 billion, pro forma, and would be led by Amsurg CEO Christopher Holden, while Envision CEO William Sanger would stay on as executive chairman of the board. The two companies had been expected to merge this week as consolidation among health insurance companies and hospitals weighed on the industry.