NEW YORK—Stocks that moved substantially or traded heavily Thursday on the New York Stock Exchange and Nasdaq Stock Market:

NYSE

Thor Industries Inc., up $1.39 at $36.95

A Wedbush analyst upgraded shares of the recreation vehicle maker to "Outperform," saying that its sales could rise in the future.

Sprint Nextel Corp., down 11 cents at $5.09

Bloomberg reported that the wireless company might consider a counterbid to T-Mobile USA's proposed acquisition of MetroPCS.

Hewlett-Packard Co., up 3 cents at $14.94

The technology company said that internal and economic turmoil will cause its earnings to fall by more than 10 percent next year.

Nasdaq

Costco Wholesale Corp., up $1.86 at $101.48

The discount retailer said that revenue at stores open at least a year rose 6 percent in September, beating Wall Street's expectations.

Bebe Stores Inc., down 20 cents at $4.39

The women's clothing company said that revenue at stores open at least a year fell 8.7 percent in its most recent quarter.

Mattress Firm Holding Corp., up $2.58 at $32.76

The mattress retailer said that its secondary public offering of about 4.7 million shares priced at $29.85 per share.

NuVasive Inc., down $7.43 at $15.19

The orthopedic device maker forecast disappointing revenue for its third-quarter, citing growing discounts from competitors.

Informatica Corp., down $7.60 at $26.04

The California-based business software maker forecast weak third-quarter results, pointing to its struggling business in Europe.