Check out the companies making headlines in after-hours trading. Nucor — Shares of the steel products manufacturer added 3% after reporting strong results for the third quarter. Nucor said its earnings per share for the period was $2.63 per share, exceeding its earlier guidance that suggested earnings would be between $2.05 and $2.15 per share, per FactSet. Revenue for the third quarter came out at $8.52 billion, greater than analysts' consensus expectation of $8.18 billion, according to FactSet. Nucor said it expects earnings from the current period to come out lower than those of the third quarter. F5 — Shares of the cybersecurity company dropped more than 6% after it issued disappointing guidance, anticipating "some near-term disruption to sales cycles" after the company had a system br

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