NEW YORK — 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.