Check out the companies making headlines in midday trading: Planet Fitness — The gym chain jumped about 4% after it issued guidance for the fiscal years 2026 through 2028. Planet Fitness expects new club unit growth to range between 6% and 7% in that time, while adjusted EBITA expands in the "mid-teens percent" compounded annually. Sweetgreen — Shares of the salad chain rose nearly 8% after co-founder and chief concept officer Nicolas Jammet bought about $1 million worth of stock. Sweetgreen shares have been battered by weakening traffic at its restaurants and are down more than 80% year to date. Sealed Air -- Shares jumped 19% on reports that Clayton Dubilier & Rice is considering an acquisition of the packaging company. The buyout firm has held talks with Sealed Air about its interest in

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