Yahoo and Facebook slip; Endo and AAR gain ground

NEW YORK (AP) - Stocks that moved substantially or traded heavily Friday:

Yahoo Inc., down $1.35 to $42.80

The company said hackers stole information from at least 500 million accounts.

Facebook Inc., down $2.12 to $127.96

The social network apologized to advertisers for what it calls an error that overstated the average length of time users watched videos on its site.

Endo International PLC, up $3.13 to $23.39

Endo named Paul Campanelli, the head of its generic drug unit, as its new CEO, replacing Rajiv De Silva.

Oshkosh Corp., down $6.02 to $50.88

The heavy vehicle manufacturer raised its current-year forecasts, but investors were disappointed with its projections for the next fiscal year.

Houghton Mifflin Harcourt Co., down $1.63 to $13.26

The book publisher said CEO Linda Zecher resigned.

AAR Corp., up 65 cents to $29.66

The airplane maintenance company reported quarterly results that were stronger than analysts expected.

Oracle Corp., down 28 cents to $39.23

After big gains recently, technology stocks pulled the market lower on Friday.

Kinder Morgan Inc., down 17 cents to $21.94

Energy companies including the pipeline operator rose as oil prices moved higher.