08:43 AM EDT, 05/09/2025 (MT Newswires) -- Wolfspeed ( WOLF ) shares fell 20% in recent Friday premarket activity, a day after it posted a wider fiscal Q3 non-GAAP net loss and lower net revenue from a year earlier.

Alpha Metallurgical Resources ( AMR ) stock was down 10% after the coal miner swung to a Q1 net loss and posted lower total revenue.

Calumet (CLMT) shares slipped 5% after reporting a wider Q1 loss and lower sales from a year earlier.

Sweetgreen ( SG ) stock fell 4.8%, a day after it lowered its full-year 2025 revenue guidance.