Casella Waste Systems Inc. (NASDAQ:CWST) shares are trading lower by 5.44% to $100.92 during Wednesday’s session after the company announced a $450 million public offering of 4.5 million shares at $100 per share. What Else: This offering will generate gross proceeds of approximately $450 million before accounting for underwriting discounts and offering-related expenses. Additionally, Casella has granted the underwriters a 30-day option to purchase up to an additional 675,000 shares at the same price, minus the underwriting discounts. All the shares involved in the offering are being sold by Ca…