NEW YORK -- Stocks that moved substantially or traded heavily on Thursday:
Palo Alto Networks Inc., up $11.56 to $212.05
The cybersecurity company beat Wall Street's fiscal fourth quarter forecasts and will buy Zingbox for $75 million.
Signet Jewelers Ltd., up $2.96 to $13.97
The jewelry company behind retailers Kay and Zales handily beat Wall Street's fiscal second quarter forecasts.
G-III Apparel Group Ltd., up $5 to $23.84
The clothing and accessories maker behind DKNY and Wilson's Leather beat Wall Street's fiscal second quarter profit forecasts.
Mallinckrodt PLC, down $1 to $1.59
The drug developer hired restructuring firms and is considering bankruptcy, according to media reports, as it faces lawsuits over opioid addiction.
Meredith Corp., down $10.14 to $33.68
The media company that also publishes Better Homes & Gardens gave investors weak profit guidance for the year.
AeroVironment Inc., up $2.57 to $55.33
The maker of unmanned aircrafts blew away Wall Street's fiscal first quarter profit forecasts.
Cloudera Inc., up $1.07 to $8.28
The cloud computing company handily beat Wall Street's second quarter forecasts on a surge in subscription revenue.
At Home Group Inc., down 39 cents to $6.52
The home decor retailer trimmed its sales forecast for the year after revenue fell short of Wall Street expectations during the fiscal second quarter.