Why Did Leggett & Platt Stock Surge 10% Pre-Market Today?

• Under the plan, Leggett & Platt investors would receive Somnigroup shares valued at $12.00 per LEG share.
• The proposal was delivered to the Leggett & Platt Board in a letter.
• Somnigroup has asked LEG’s board to respond by December 22. 

Somnigroup International Inc. (SGI) announced a formal proposal to acquire Leggett & Platt Inc. (LEG) through an all-stock deal that would exchange each LEG share for SGI stock valued at $12.00. 

The proposal aims to keep Leggett & Platt operating under its own management while integrating it into a larger enterprise.

Deal Terms And Premium

Under the plan, Leggett & Platt investors would receive Somnigroup shares valued at $12.00 per LEG share, based on a yet-to-be-finalized exchange ratio. This represents a roughly 30.3% premium over LEG’s average closing price over the previous 30 trading days.

Following the announcement, Leggett & Platt’s stock traded over 10% higher in Monday’s premarket. The proposal was delivered to the Leggett & Platt Board in a letter on Dec. 1, 2025.

On Stocktwits, retail sentiment around the stock jumped to ‘bullish’ from ‘bearish’ territory the previous day, and message volume improved to ‘high’ from ‘normal’ levels in 24 hours. 

Why Somnigroup Thinks It Works

Somnigroup stated in the letter that the all-stock structure gives LEG shareholders a tax-efficient path to share in long-term value creation from the combined entity. The companies have collaborated commercially for years, and combining Leggett & Platt’s manufacturing capabilities with Somnigroup’s broader distribution network is expected to create greater strategic efficiency and scale.

"Leggett & Platt has been an important supplier to our Company for many years.” 

- Scott Thompson, Chairman and CEO, Somnigroup 

The proposal comes with unanimous backing from Somnigroup’s board. Somnigroup has asked LEG’s board to respond by December 22, 2025. 

LEG stock has gained over 6% in 2025 but declined over 19% in the last 12 months. 

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