Armstrong World Industries' stock plummeted 7.59% during intraday trading on Tuesday, following a significant pre-market decline.

The sharp drop came after the ceilings and architectural products maker reported first-quarter adjusted earnings per share of $1.69, missing the analyst consensus estimate of $1.81. While net sales of $409.9 million slightly exceeded expectations, profitability was pressured by non-recurring costs including severance expenses, acquisition-related costs, and a tariff adjustment.

Operating income declined 4.4% to $94.2 million, with the Architectural Specialties segment facing particular margin pressure. Despite double-digit sales growth in that segment, operating income dropped 37.2% due to what the company described as short-term headwinds during the quarter.