Steel Mills
Nucor reports IT systems breach
Written by Stephanie Ritenbaugh
May 14, 2025
Nucor Corp. reported a cybersecurity breach of its IT systems.
In a filing with the US Securities and Exchange Commission, Nucor said it identified an incident “involving unauthorized third-party access to certain information technology systems used by the company.”
The Charlotte, N.C.-based steelmaker said it took the affected systems offline and implemented other containment, remediation, or recovery measures.
“The company is actively investigating the incident with the assistance of leading external cybersecurity experts and has notified federal law enforcement authorities,” Nucor said in the May 13 filing.
The steelmaker said it temporarily and proactively halted some production operations at various locations.
A spokeswoman declined to specify which locations were affected.
“Despite this interruption, we are taking care of our customers and are in the process of restarting the affected operations,” the spokeswoman said.
Nucor is the largest steelmaker in North America with 26 US-based mills and more capacity coming online.
Stephanie Ritenbaugh
Read more from Stephanie RitenbaughLatest in Steel Mills
Steel Summit: Analysts say demand likely to struggle until 2027
Steel industry analysts at this year's SMU Steel Summit said they see lackluster demand through this year and next.
USS Clairton begins full production of batteries 19 and 20, 13 and 14 hot idled
U.S. Steel has activated batteries 19 and 20 at its Clairton Coke Works facility after pausing each “out of an abundance precaution” following an explosion at the site on Aug. 11.
Steel Summit: Schneider sees SDI ‘on the edge of a very good run’
Steel Dynamics Inc. (SDI) President and Chief Operating Officer, Barry Schneider, remains bullish about the Fort Wayne, Ind.-based steelmaker’s position in the current market.
Steel Summit: Burritt says USS and Nippon are fast-tracking modern steelmaking
U.S. Steel President and CEO David Burritt told audiences at SMU's Steel Summit 2025 that the iconic American steelmaker’s partnership with Nippon Steel is fast-tracking smarter steel production.
Nucor moves to stop HRC price slide with $10/ton hike
Nucor is attempting to halt the decline in hot-rolled coil prices with the announcement of a $10-per-short-ton increase in its weekly consumer spot price on Monday.