MAGN +21.4%. Mativ Holdings +6.8%, Sylvamo −22.0%, International Paper −26.9%. Weekly closes, Oct 17, 2025 = 100, log scale.

End-of-day closes (Databento EOD), the last close of each week. The three peers are the largest US-listed companies by market value in MAGN’s SEC industry (Paper Mills) with a year of closes. It shows what the closes did; a move here is not a cause, a forecast or a call.