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

NYSE

Exxon Mobil Corp., up 42 cents at $37.25

Banc of American Securities raised its rating on Exxon Mobil to ``buy'' from ``neutral.''

Fairchild Semiconductor International Inc., up $2.01 at $16.97

Bear Stearns upgraded Fairchild Semiconductor to ``outperform'' from ``peer perform.''

Motorola Inc., $10.73, unchanged

Morgan Stanley lowered its rating on Motorola to ``equal-weight'' from ``overweight.''

NASDAQ

Corinthian Colleges Inc., down $1.25 at $54.76

The for-profit post-secondary education company posted fourth-quarter earnings of 39 cents a share, beating analysts' expectations by 2 cents.

3Com Corp., up 30 cents at $5.72

US Bancorp Piper Jaffray raised its rating on 3Com, which makes networking hardware and software, to ``market perform'' from ``underperform.''

Xoma Ltd., down 45 cents at $9.30

Fulcrum lowered its rating on drugmaker Xoma to ``neutral'' from ``buy.''