NEW YORK ( TheStreet) -- The maker of the Invisalign teeth straightening system, Align Technology ( ALGN) ended Wednesday's trading session down 3.8% to $20.37 after agreeing to acquire dentistry imaging company Cadent for $190 million.


Apollo Global Management ( APO) fell 4.2% to $18.20 following rousing reception of the private-equity firm's long-awaited initial public offering Tuesday. On Wednesday, Thomson Reuters releases data highlighting mixed IPO results from Apollo's portfolio companies.
>> Apollo's IPO Gets Warm Reception


Palo Alto, Calif.-based cloud computing application maker Tibco Software ( TIBX) rose 1.8% at $26.74 after edging past Wall Street's expectations for its fiscal first-quarter results. While Tibco's performance was ahead of the consensus view, the magnitude of the beat was only 5% vs. a 16% average beat in the previous eight quarters.
>> Tibco Software: After-Hours Trading


Wal-Mart ( WMT) rose 0.2% to $52.36 after a visiting positive territory as judges expressed skepticism about a large class-action lawsuit against the giant retailer over sex discrimination.


Phosphate and potash company Mosaic ( MOS) ended up 2% to $80.45 ahead of its third-quarter earnings report after the markets close Wednesday.


Chemicals company DuPont ( DD) added 1.4% to $55.37 after its subsidiary DuPont Denmark extended a $6 billion offer for food ingredients company Danisco to April 29 to allow for additional time to obtain regulatory approvals in the European Union and China. So far, shareholders representing a mere 6% stake in Danisco have accepted DuPont's offer, 90% short of the acceptances the buyer would have needed to meet its original offer closing date of April 1.


Drug company Cephalon ( CEPH) is facing a hostile bid from Valeant Pharmaceuticals ( VRX), which is offering $73 a share, a 24% premium to Cephalon's closing price Tuesday of $58.75.

Cephalon shares surged 28.4% to $75.44 Wednesday.

Shares of Valeant popped 12.8% to $50.08.
>> Valeant Goes Hostile With Cephalon Bid


Investment manager BlackRock ( BLK) advanced 6.6% to $198.84 as it replaces biotech company Genzyme ( GENZ) in the S&P 500 after the markets close on Friday.


Discount store chain Family Dollar ( FDO) fell 0.3% to $52.25 as investors took profits after the company reported second-quarter earnings of 98 cents a share. The earnings beat narrowly expectations by a penny.

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-- Written by Andrea Tse in New York.

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