S&P MidCap 400 in Focus: PMI HANS

Shares of the company gained 38 cents, or 18.2 percent, to $2.47.

The index rose 2.27 points to 800.34 as Wall Street wavered amid the rising price of oil. The S&P MidCap 400 is an index used to track mid-sized companies which have a market capitalization of $1.5 billion to $5.5 billion.

Shares of Cleveland-Cliffs Inc. surged $16.07, or 17.5 percent, to $108.01, after the miner raised its iron ore sales outlook.

Steel Dynamics Inc. shares advanced $2.86, or 9 percent, to $34.56, following a UBS analyst upgrade.

On the losing side, shares of Hansen Natural Corp. dropped $3.17, or 11 percent, to $25.78 after the Monster energy drink maker said sales at convenience stores have been soft.

Shares of AirTran Holdings Inc. lost 23 cents, or 10.5 percent, to $1.96. Earlier this week, the carrier said it will cut 480 jobs to help offset rising fuel costs.

Federal Signal Corp. shares declined $1.16, or 8.8 percent, to $12 after the maker of fire trucks and security systems was downgraded by an analyst.