Stocks making the biggest moves premarket: ON, W, SPOT, TSLA
Check out the companies making headlines before the bell: Berkshire Hathaway — Class B shares of Warren Buffett’s conglomerate dipped nearly 1% in premarket after Berkshire’s operating profit fell 4% year over year to $11.16 billion in the second quarter, affected by a decline in insurance underwriting. Buffett’s cash hoard of $344.1 billion remained near…