Stocks that moved substantially or traded heavily Friday on the New York Stock Exchange:

NYSE

American International Group Inc., down $5.41 at $12.14

Concerns persisted over its reserves, as one analyst noted "severe anxiety over the financial condition" of the world's largest insurer.

Lehman Brothers Holdings Inc., down 57 cents at $3.65

Top executives raced to arrange a sale, as Treasury Secretary Henry Paulson said he opposed a government rescue of the investment bank.

General Motors Corp., up 26 cents at $13.01

Several analysts are optimistic that it and other automakers will obtain government loans to help them develop more fuel-efficient vehicles.

Merrill Lynch & Co., down $2.38 at $17.05

Concern over the fate of competitor Lehman Brothers dragged down the financial sector, pummeling shares of the nation's No. 1 brokerage.

Cemex SAB de CV, down $1.45 at $18.70

The Mexican cement giant forecast a drop in third-quarter results after Venezuela's government nationalized its cement operations last month.

Petroleo Brasileiro SA, up $3.52 at $45.70

An analyst reiterated a "buy" rating after the company said an offshore oil field is expected to yield the equivalent of 3 to 4 billion barrels of oil and natural gas.

Tenet Healthcare Corp., up 27 cents at $6.48

Two analysts were optimistic on the hospital operator, with Banc of America saying it "should finally be able to execute on its turnaround."

Chipotle Mexican Grill Inc., down $14.45 at $56.70

The burrito chain predicted it would report a third-quarter profit lower than a year ago, saying a weak economy has sapped its sales.