After-hours buzz: Yahoo, JC Penney, CSX

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

Yahoo - The search engine's chief operating officer, Henrique de Castro, is leaving the company, effective Thursday. Its shares were mildly lower in after-hours trading.

J.C. Penney Co. - The department store operator said it would close 33 stores and eliminate 2,000 jobs. Its shares were down in after-hours trading.

CSX - The provider of railroad transportation posted fourth-quarter earnings per share of 42 cents on $3 billion in earnings, versus expectations calling for EPS of 43 cents on $3.01 billion in revenue. Its shares fell 3 percent in after-hours trade.

Plexus - The company reported first-quarter non-GAAP diluted EPS of 61 cents, excluding 10 cents per share of restructuring charges, on $534 million in revenue, versus expectations of EPS of 61 cents on $536 million in revenue. Its shares edged lower in after-hours trading.

—By CNBC's Kate Gibson.

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