Honeywell International Inc. is buying Sundyne LLC for $2.2 billion in an effort to build up its Energy and Sustainability (ESS) business. It’s the latest in a string of deals as the conglomerate prepares to break up.

Honeywell’s stock fell 0.3% in premarket trading on Tuesday. The stock has fallen 6.1% in 2025, while the S&P 500

SPX has fallen 0.5%.