Breaking Up Is Hard to Do (But Honeywell’s Doing It Twice): The Three-Way Honeywell Spinoff

Honeywell Spinoff Multiball- Three Independent Companies

25 years ago, Honeywell (HON) was set to merge with GE(GE). Jack Welch stayed on to get the combination on proper footing. And then regulators stopped the deal. With the deal killed, Honeywell executed well for decades. Now, however it plans to follow GE’s 3 way lead and break into 3 companies, as GE did, later in the year.

Long term readers will recall that Honeywell is a repeat spinoff parent having completed its AdvanSix(ASIX) spinoff in October 2016. After a decade, ASIX is trading less than 20% above its spinoff price after a roller coaster ride that has taken it both far lower and far higher.

Honeywell is in the middle of one of the most ambitious industrial breakups of the decade: three independent public companies, carved out on a staggered timeline. In sequence, Honeywell will (1) spin off Advanced Materials (the business now branded Solstice Advanced Materials) and then (2) separate Automation and Aerospace into two standalone firms. Management is targeting late 2025 / early 2026 for the first spin and 2H 2026 for the remaining separations—each intended to be tax-free to Honeywell shareowners. (Honeywell, Honeywell International Inc., advancedmaterials.honeywell.com, Reuters)

Honeywell Spinoff Timeline & Order

October 8, 2024 — Honeywell announces intent to spin off Advanced Materials to shareowners, targeting completion by end of 2025 or early 2026 (tax-free), subject to customary approvals and Form 10 effectiveness. (Honeywell)
February 6, 2025 — Honeywell adds the big reveal: Automation and Aerospace will be separated into two independent companies, with completion targeted for 2H 2026, also tax-free to shareowners. (advancedmaterials.honeywell.com)
March 25, 2025 — Honeywell names the Advanced Materials company “Solstice Advanced Materials” and appoints a leadership team (David Sewell to lead the unit). (Honeywell, Reuters)
August 21, 2025 — Honeywell files the Form 10 for Solstice and schedules an Investor Day for October 8, 2025 to lay out the standalone strategy and financials. (The Form 10 is now posted at the SEC and Honeywell IR.) (Honeywell International Inc.)

Order of execution:

Solstice Advanced Materials (spin-off to shareowners) → 2) Automation and Aerospace separate from each other in 2H 2026. (advancedmaterials.honeywell.com, Honeywell)

What goes into each Honeywell Spinoff company

1) Solstice Advanced Materials (to be separated in Q4 2025)

The carve-out gathers Honeywell’s specialty materials portfolio—most visibly the Solstice® family of low-global-warming refrigerants and blowing agents—plus electronic/specialty materials, protective fibers, and healthcare packaging brands. Honeywell has been emphasizing Solstice’s alignment with “three powerful megatrends” (sustainability, digital/semiconductor enablement, and health) and has been clear about the tax-free distribution and capital-structure work underway. Form 10 was filed on Aug. 21, 2025, with Investor Day Oct. 8, 2025. (Honeywell, Honeywell International Inc.)

Recent coverage indicates Solstice posted ~$3.8B in sales in 2024 across two operating groupings: Refrigerants & Applied Solutions and Electronic & Specialty Materials, with a robust EBITDA profile (details to be confirmed in the final Form 10/Investor Day deck). (AInvest)

2) Automation (to be separated in 2H 2026)

This umbrella covers building technologies and process automation (e.g., the UOP refining & petrochem technologies brand, building controls, fire/safety). Honeywell has been “cleaning the garage” ahead of separation—both through acquisitions (e.g., Johnson Matthey’s catalyst technologies for £1.8B to strengthen UOP) and potential divestitures (evaluating strategic alternatives for its PSS and WWS businesses that serve transportation/logistics; each roughly $1B in revenue). The idea is to narrow to core automation/control franchises before the split. (Financial Times, Barron’s, Honeywell)

3) Aerospace (to be separated in 2H 2026)

A high-margin franchise supplying avionics, engines and systems, software, and services to commercial and defense customers. The February 2025 update confirmed Aerospace will stand alone alongside Automation post-breakup. Investor expectations are high that Aerospace could garner a premium multiple as a pure-play. (advancedmaterials.honeywell.com, Reuters)

Why Honeywell is doing these spinoffs(and why now)

Several forces converged:

Activist pressure: Elliott Investment Management disclosed a stake exceeding $5B in late 2024 with public advocacy for separation; by May 31, 2025, Honeywell added Elliott partner Marc Steinberg to its board (Audit Committee), reinforcing momentum behind a bigger breakup than the initially announced Advanced Materials spin alone. (Reuters)
Portfolio review & focus: CEO Vimal Kapur’s comprehensive portfolio review concluded with a three-company plan—Advanced Materials first; Automation and Aerospace later—each with cleaner mandates, investor narratives, and capital allocation. (Honeywell International Inc.)
Precedent & market receptivity: Markets have rewarded clarity from large industrial unbundlings (GE, Carrier/Otis/RTX lineage), encouraging Honeywell to pursue pure-plays that match investor archetypes (chemicals/materials; controls/automation; aerospace/defense). Independent reporting frames this as part of a broader trend and explicitly confirms the three independent listings plan. (Reuters)

Mechanics: structure, tax, capital, and “stranded cost” work

Tax: Honeywell’s stated goal is tax-free distributions to shareowners for all pieces (subject to customary IRS/SEC conditions). That language appears in both the Advanced Materials and Automation/Aerospace announcements. (Honeywell, advancedmaterials.honeywell.com)
Capital structure: Debt and cash will be allocated among the entities at closing. Expect Transition Service Agreements (TSAs) for shared functions and an explicit stranded-cost program at corporate—common in large breakups—to be detailed at Solstice’s October Investor Day and later in the Automation/Aerospace filings. (Honeywell hasn’t published final debt allocations yet; look for them in the Form 10 amendments and future Form 10s.) (Honeywell International Inc.)
Separation readiness: Honeywell is actively pruning non-core assets within Automation (PSS/WWS review) and adding capabilities (Johnson Matthey catalysts) to present crisper, investable segments in the Automation S-curve (industrial decarbonization, process optimization, and building tech). (Barron’s, Financial Times)

What to watch next (near-term checkpoints)

Solstice Investor Day — Oct. 8, 2025 (NYC): Management should disclose segment profitability, capital policy, dividend stance (if any), and growth algorithms (volume/price/mix). (NJB Magazine)
Form 10 amendments for Solstice: Risk factors, stand-alone costs, debt load, intercompany agreements, and carve-out financials. (Honeywell International Inc.)
Automation/Aerospace sequence: Confirm which legal entity “keeps” the Honeywell name, ticker, and index memberships; watch early 2026 for initial filings and leadership rosters. (advancedmaterials.honeywell.com)
Portfolio actions: Outcome of the PSS/WWS strategic alternatives (sale, spin, or keep) and integration progress of Johnson Matthey catalysts within UOP. (Barron’s, Financial Times)

Investor framing: three distinct theses

Solstice Advanced Materials (first) — A specialty materials pure-play with regulatory tailwinds (HFO/HFO-blend refrigerants and other low-GWP chemistries), semiconductor and lab-consumables exposure, and potential for solid free cash conversion. Risks include regulatory pacing (timelines for HFC phase-downs), cyclical end-markets in electronics/industrial, and raw-material volatility. (Honeywell)
Automation (second wave) — Controls, process technology, and building automation aligned with industrial decarbonization, efficiency, and safety. Portfolio “sharpening” (PSS/WWS) plus UOP capabilities could set up a cleaner, higher-quality mix pre-listing. Risks include capex cycles in refining/chemicals and construction exposure. (Barron’s, Financial Times)
Aerospace (second wave) — A premium, high-margin aviation/defense franchise that might command the highest multiple of the three if growth and aftermarket stick. Risks include OE build-rate sensitivity, defense budget mix, and supply-chain complexity. (advancedmaterials.honeywell.com)

How we got here: activism, misses, and momentum

The move to a three-company plan accelerated after a challenging 2025 outlook and Elliott’s public campaign. Reuters framed it succinctly in February 2025: Honeywell is splitting into three independently listed companies, just months after Elliott’s stake disclosure. By May 31, Elliott had a seat at the table. By July 8, Honeywell was reviewing strategic alternatives inside Automation to streamline before separation. The Aug. 21 Solstice Form 10 filing confirms the first leg is on the runway. (Reuters, Honeywell International Inc.)

Honeywell Spinoff Bottom line

Order: Solstice Advanced Materials first (late 2025 / early 2026), then Automation and Aerospace in 2H 2026.
Intent: Tax-free distributions to shareowners, with carve-out financials, debt allocation, and TSAs to be detailed across filings and investor days.
Why it matters: Three pure-plays in materials, automation, and aerospace should be easier to value and may support higher aggregate equity value—if execution (portfolio pruning, cost takeout, and clean separation) stays on plan. (Honeywell, advancedmaterials.honeywell.com)

Disclosure: The author holds no position in any stock mentioned