Honeywell's board has formally approved the separation of its Aerospace segment, marking a decisive step toward spinning off one of its most valuable business units. Aerospace is the crown jewel of HON's $37.4B revenue base (up 7.8% YoY), historically commanding premium multiples versus the conglomerate discount baked into HON's current valuation. The board approval clears what is often the highest-friction internal hurdle, with execution risk now shifting to regulatory filings, tax structuring, and market timing.

The setup centers on whether the spin-off will close the conglomerate discount fast enough to matter — and how the RemainCo is valued post-separation. Investors should watch for the Form 10 filing with the SEC (which would anchor a timeline), any guidance updates on stranded costs, and whether activism risk re-emerges if the stock doesn't reprice. The 12.7% net margin at the parent level leaves room for margin-mix improvement at the Aerospace pure-play, but execution costs could weigh near-term.