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Nucor Halts Operations Amid Cybersecurity Breach

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On Wednesday, steel manufacturer Nucor announced that it had encountered a cybersecurity incident that led the company to temporarily suspend certain production operations as a precautionary measure.

Headquartered in North Carolina, Nucor reported that it had detected “unauthorized third-party access to specific information technology systems” utilized in its operations.

While Nucor did not detail which production units were “temporarily and proactively” halted in its regulatory submission, the company confirmed it was in the process of restoring these operations.

Nucor steel recycling plant, Seattle, Washington, USA, January 14, 2015

The company operates facilities across North America.

Ticker Security Last Change Change %
NUE NUCOR CORP. 117.73 -1.21 -1.02%

As part of its response to the cybersecurity issue, Nucor stated it had taken “potentially affected systems offline” and initiated other measures detailed in the regulatory filing.

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CHONGQING, CHINA - APRIL 23: In this photo illustration, the logo of Nucor Corporation is displayed on a smartphone screen, with a stock market chart in the background, reflecting investor sentiment and trading dynamics, on April 23, 2025, in Chongqing, China. Nucor is the largest steel producer in the United States and a major player in the North American steel industry, known for its electric arc furnace technology and sustainable steelmaking practices. (Photo illustration by Cheng Xin/Getty Images)

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Nucor stated in its filing that the company is diligently investigating the incident with the help of top external cybersecurity advisors and has informed federal law enforcement of the situation. It emphasized that as the investigation unfolds, it will continually assess the timing and significance of the event.

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Promoted as the “largest and most diversified steel and steel products producer” in North America, Nucor manufactures a range of products including bars, beams, electrical conduit, girders, and fasteners, as outlined on its website.

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