NEW YORK (AP) _ Stocks that were moving substantially or trading heavily Friday on the New York Stock Exchange and Nasdaq Stock Market.

NYSE

Houghton Mifflin Co., up $4.91 to $59.47

The Boston company, one of the country's oldest publishers of educational materials, announced it will be acquired by the French entertainment company Vivendi Universal SA for $1.7 billion in cash.

Bellsouth Corp., down 83 cents to $40.40

Bellsouth, the dominant local phone company in the Southeast, warned that weak currency exchange rates in Brazil and Colombia will lower second-quarter earnings by at least a nickel a share.

Abbott Laboratories, down 31 cents to $51.67

Shares fell on reports that the Food and Drug Administration has said its Synthroid drug, used for treatment of thyroid problems, did not meet safety standards.

NASDAQ

Frontier Airlines Inc., down $1.66 to $13.85

Shares fell after the Denver-headquartered airline said earnings in the April-June quarter would be in a range of 28 cents to 38 cents, considerably below the year-earlier 57 cents a share.

IXIA Inc., down $1.10 to $12.40

This Calabasas, Calif., which designs interface cards for fiber-optic and copper line networks, said second-quarter earnings would suffer from the slowdown in the telecommunications sector.

Immune Response Corp., down $2.99 to $1.91

Investors unloaded shares after the company reported its Remune therapy for HIV didn't meet its primary goals.