Lamps Mark F. 4

What Happened
Mark F. Lamps, President of Safety & Infrastructure at Atkore Inc. (ATKR), sold 1,000 shares in an open-market/private sale on February 17, 2026, at $65.78 per share, resulting in proceeds of $65,780. This was a sale (not a purchase) and was executed under a pre-established Rule 10b5-1 trading plan.

Key Details

• Transaction date: 2026-02-17
• Transaction type/code: Sale (S)
• Shares sold: 1,000 at $65.78 each; total proceeds $65,780
• 10b5-1 plan: Yes — plan adopted February 6, 2025 (footnote F1)
• Shares owned after transaction: Not specified in this Form 4
• Additional ownership note: Reported ownership totals may include unvested RSUs and accrued dividend equivalents (footnote F2)
• Filing timeliness: Filing date equals transaction date (2026-02-17); no late filing indicated

Context
A sale under a 10b5-1 plan is a prearranged trade and is commonly considered routine rather than a near-term signal of the insider’s view on the stock. This report is factual and does not indicate the insider’s motivation.