Extreme Networks, Citrix And AngioDynamics Lead Thursday's After-Hours Movers

Extreme Networks, Inc EXTR plunged 15 percent to $2.75 a share in late trading Thursday after the network infrastructure equipment company issued a third-quarter profit warning.

The Medicines Company MDCO shares declined more than 7 percent in the after-hours session, trading recently at $25.83 on disappointing preliminary first-quarter revenue.

Citrix Systems, Inc. CTXS dropped 7 percent to $60.69 in extended trading on a reduced first-quarter outlook.

AngioDynamics, Inc. ANGO also lost 7 percent, changing hands recently at $17, on a weak quarterly report and outlook.

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Fidelity National Information Services FIS declined 6 percent to $64 a share, after the company cut its first-quarter and full-year guidance.

China Finance Online Co. (ADR) JRJC extended its earlier gains, rising more than 2 percent in late trading Thursday to $5.87 a share. The financial information and services company closed up 18 percent without any news.

Argo Group International Holdings, Ltd. AGII shares rose 2.5 percent in after-hours trading Thursday to $51.78. The Bermuda-based insurance and reinsurance company didn't publish any news.

Horizon Pharma PLC HZNP gained about 2 percent in late trading recently to $27.90. The Ireland-based company, which offered $1.1 billion for Hyperion Therapeutics Inc. HPTX of California last month, didn't offer any market-moving news Thursday.

Walker & Dunlop, Inc. WD gained 2 percent to $18.20 a share. The Bethesda, Maryland-based commercial real estate company's shares have been volatile in recent days.

Cirrus Logic, Inc. CRUS ticked up 2 percent in late trading to $34.10 after closing down more than 1 percent. The integrated circuits company didn't issue any market news.