Chesapeake Energy Corp., up 53 cents at $20.80
The natural gas company named Anadarko Petroleum Corp. executive Robert Douglas Lawler as its new chief executive officer.
Red Hat Inc., down $2.34 at $52.65
A BMO Capital Markets analyst downgraded the software company's shares after a big share-price increase in May.
WPX Energy Inc., down $1.30 at $19.76
Hedge fund Taconic Capital Advisors said in a regulatory filing that it now has a 6.39 percent interest in the oil and gas company.
Tellabs Inc., down 14 cents at $2.02
The communications equipment maker said that its chief financial officer is resigning for personal reasons.
JA Solar Holdings Co. Ltd., up $3.95 at $9.56
The Chinese solar company said that its loss narrowed during its first quarter, helped by stronger-than-expected demand.
Warner Chilcott PLC, up 39 cents at $19.60
Actavis Inc. said that it is buying rival drugmaker Warner Chilcott in an all-stock transaction valued at about $8.5 billion.
Ironwood Pharmaceuticals Inc., down 56 cents at $13.83
A Cantor Fitzgerald analyst reiterated her “Sell” rating on the constipation treatment maker, citing a weak reception to its new drug.
Xenoport Inc., down $1.03 at $5.72
The drug developer said that a potential treatment for multiple sclerosis patients failed in late-stage clinical testing.