After-hours buzz: JC Penney, Dean Foods, Acura Pharmaceuticals & more


Check out which companies are making headlines after the bell Monday:

JCPenney - Bill Ackman's Pershing Square sold its entire stake in the retailer, totaling nearly 39 million shares. Shares tumbled in extended-hours trading.

(Read More: Stocks reverse gains to close near session lows, Dow ends below 15000)

Dean Foods - The food and beverage company reiterated its third-quarter earnings guidance, accounting for the impact of the firm's reverse stock split. Shares edged higher in extended-hours trading.

Acura Pharmaceuticals - The specialty pharmaceutical company said its painkiller drug made with abuse-deterrent technology did not show statistically significant results in reducing likability among users. Shares plunged in extended-hours trading.

Jones Lang LaSalle - The real-estate services company acquired Houston-based property management firm Knaus Partners, but financial terms of the agreement were not immediately disclosed. Shares were unchanged in extended-hours trading.

Blackbaud - The software supplier named current CFO Anthony Boor as its interim President and CEO. Shares were unchanged in extended-hours trading.

—By CNBC's JeeYeon Park (Follow JeeYeon on Twitter: @JeeYeonParkCNBC)

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