Exhibit 99.1 Atkore Inc. Announces Fourth Quarter 2025 Results • Net sales of $752.0 million compared to$788.3 million in the prior year • Net (loss) of $(54.4) million compared to net income of$73.1 million in the prior year ◦ Net (loss) includes $66.7 million non-cash impairment of certain long-lived assets in our HDPE business ◦ Net (loss) includes$18.9 million non-cash goodwill impairment related to the Mechanical reporting unit • Adjusted EBITDA of $70.9 million compared to$140.1 million in the pri ...