Double Hull Tankers (DHT) - Get Report is upgraded to a buy rating from neutral at UBS. However, UBS' price target for Double Hull dips to $15.00 from $15.75.

Nalco

( NLC) is upgraded to a buy rating from hold at Jefferies. The price target and fiscal 2008 EPS estimates hold at $27 and $1.30, respectively.

Goldman reinstates its rating on

Transocean

(RIG) - Get Report

. Goldman said it is removing the "not rated" designation from RIG and now rates shares as neutral. Goldman sees strong deepwater exposure and growth profile but cited concerns over valuation and increased jackup exposure (30% of EBITDA now vs. 15% pre-merger). Goldman keeps its price target for Transocean at $157.

Range Resources

(FBR)

is upgraded to an outperform rating at FBR, which said positive news flow is expected before year-end. Target price is $48.

American International Group's

(AIG) - Get Report

numbers are lowered at UBS. Its price target drops to $61 from $75, and fiscal 2008 earnings-per-share estimates dip to $6.19 from $6.44. UBS reiterates its neutral rating.

Goldman said it is trimming its target on

Boeing

(BA) - Get Report

to $98 from $103 on the basis of a lower relative price/earnigns multiple in its valuation model. Goldman says it believes Boeing's current share price anticipates fewer than 85 deliveries by the end of 2009. It maintained its neutral rating.

Deutsche Bank said it is cutting its target price on

Dollar Tree Stores

(DLTR) - Get Report

from $41 to $30 as comps have decelerated.

Dollar Tree also had its price target reduced at Goldman, to $34 from $39. Dollar Tree's third-quarter results were in line, but guidance was lower than expected. Goldman noted lower gross margins and increasing competitive pricing from discounters, and it maintained its neutral rating.

Credit Suisse said it is lowering its target price on

Pep Boys

(PBY) - Get Report

to $11 from $13 after third-quarter results fell short of estimates. Credit Suisse says Pep Boys' earnings power is not there to support a materially higher stock price. The bank maintained its underperform rating.

Sigma Designs'

(SIGM)

earnings-per-share estimates for 2008 are raised at Goldman to $2.26 from $1.61. Sigma's third-quarter results were well ahead of estimates because of strong IPTV deployments and Blu-ray player sales. Goldman said expectations could become too high regarding market growth rates and the company's ability to capture market share against heightened competition. Goldman maintained its neutral rating on Sigma and increased its target to $60 from $45.

Sigma's target price was also raised from $62 to $75 at Deutsche Bank, which said the company can maintain its leadership position in end markets.