ArcelorMittal, American International Group, Chipotle Mexican, Generac Holdings, United States Steel Corp, Express Scripts Holding, Alumina Ltd and R.R. Donnelley & Sons Co are among the companies whose shares are moving in pre-market trading Tuesday.

ArcelorMittal (MT) stock gained 2.19 percent to $15.38 in pre-market trading. The stock has a 52-week low of $13.28, a 52-week high of $23.62 and $23.31billion in market capitalization.

American International Group Inc. (AIG) stock advanced 1.25 percent to $33.09 in pre-market trading. The company stock was reiterated with an “outperform” rating at Sanford C. Bernstein Monday.

Chipotle Mexican Grill Inc. (CMG) stock gained 1.26 percent to $268.55 in pre-market trading. The stock has a 52-week low of $233.82, a 52-week high of $442.40 and $12.67 billion in market capitalization.

Generac Holdings Inc. (GNRC) stock advanced 1.17 percent to $39.05 in pre-market trading. Analysts at JPMorgan Chase raised their price target on shares of GNRC to $31.00 Monday.

United States Steel Corp. (X) stock advanced 1.56 percent to $21.46 in pre-market trading. The stock has a 52-week low of $20.69, a 52-week high of $21.46 and $3.05 billion in market capitalization.

Express Scripts Holding Co. (ESRX) stock tumbled 14.12 percent to $54.00 in pre-market trading. The company reported the third quarter adjusted net profit of $1.02 per share, up from $0.79 per share last year and also topped Reuters’ estimate of $0.99 per share. But the company warned that its 2013 earnings outlook will also be influenced by the current weak business climate and the unemployment outlook.

Alumina Ltd. (AWC) stock fell 2.08 percent to $3.77 in pre-market trading. The stock has a 52-week low of $2.65, a 52-week high of $6.42 and $2.35 billion in market capitalization.

R.R. Donnelley & Sons Co. (RRD) stock declined 1.20 percent to $9.81 in pre-market trading. The company announced Monday that it had been awarded a multi-year agreement that renews and expands its relationship with AARP, a nonprofit and nonpartisan organization. Under the terms of the agreement, RR Donnelley will provide a comprehensive range of magazine and direct response printing, premedia and logistics services.