The Breakup Era: GE, Honeywell, 3M, and the Industrial Separation Wave

Introduction

GE Aerospace's stock rose from approximately $135 after the April 2024 separation to an all-time high of $348.48 in March 2026, a total return exceeding 125% in less than two years. That performance did not just validate the thesis that the conglomerate discount at GE was real. It created a template that every other industrial conglomerate board had to take seriously. Honeywell announced its own three-way separation in February 2025. 3M completed the Solventum spinoff in April 2024. Emerson sold its remaining Copeland (Climate Technologies) interests to Blackstone in 2024 and is pursuing further simplification. Divestiture activity across large-cap companies surged 40% in Q1 2026 versus Q1 2024. The industrial conglomerate model, which dominated American industry for four decades, is being systematically and irreversibly unwound in four years.

This article maps the major separations, explains how each transaction was structured, and analyzes the value creation (or destruction) that followed each breakup.

GE's three-way split was the most consequential industrial transaction of the decade. The company separated into GE Aerospace (jet engines, defense systems), GE Vernova (power generation, renewable energy, grid solutions), and GE HealthCare (medical imaging, diagnostics, pharmaceutical diagnostics). GE HealthCare was spun off in January 2023 via a partial IPO followed by a full spin, while GE Vernova was spun off on April 2, 2024, completing the final dissolution of the iconic 131-year-old industrial conglomerate.

GE Aerospace reported full-year 2025 revenue of $45.9 billion (18% year-over-year growth), driven by the LEAP engine aftermarket ramp and strong defense demand. The stock's 125%+ appreciation post-separation reflected the market applying a pure-play A&D premium multiple to the aerospace earnings stream that had previously been diluted by the power and healthcare businesses within the conglomerate multiple.

GE Vernova trades as a pure-play in power generation and energy transition, attracting energy infrastructure investors who previously could not invest in GE's energy business without also buying aerospace and healthcare exposure. GE HealthCare trades as a medical technology company valued on medtech multiples. Each entity has its own board, management team, capital structure, and investor base, allowing focused strategic decision-making and capital allocation.

Honeywell announced in February 2025 that it would separate into three independent companies, directly referencing the GE template. The separation plan creates:

Elliott Management's **$5+ billion** stake, disclosed in November 2024, was the primary catalyst for the separation announcement. Elliott's public analysis argued that the combined entities could unlock 51-75% upside for shareholders by eliminating the conglomerate discount.

3M completed the spin-off of its healthcare business as Solventum Corporation (NYSE: SOLV) on April 1, 2024. The separation created a focused medtech company with wound care, oral care, healthcare IT, and purification and filtration businesses, while the remaining 3M retained its industrial, safety, transportation, and consumer businesses.

Solventum's initial performance was mixed: the stock stayed flat through much of 2024, underperforming medtech competitors, and the company faced investor skepticism about its ability to grow independently without 3M's scale and R&D resources. However, a broad restructuring in late 2024 and debt paydown through 2025 positioned the company to enter 2026 with positive momentum. The 3M parent stock rose approximately 6% on the separation announcement, reflecting modest relief from removing the lower-growth healthcare segment.

The 3M-Solventum separation illustrates an important lesson: not all industrial separations produce the dramatic value creation that GE's did. The value creation depends on the degree of conglomerate discount (3M's discount was arguably smaller than GE's), the quality of the separated entities' standalone management (Solventum faced execution challenges as a new public company), and the market's willingness to re-rate each entity at pure-play multiples (which requires the entity to demonstrate independent operational credibility).

The GE separation provides the most detailed public case study of industrial breakup execution because it unfolded over multiple years with extensive public disclosure.

Phase 1: Strategy and planning (2021-2022). CEO Larry Culp announced in November 2021 that GE would separate into three companies. The initial plan called for GE Healthcare to separate first (via IPO/spin-off in January 2023), followed by the power/renewable energy business approximately one year later. This staggered approach allowed the separation team to learn from the first transaction before executing the second.

Phase 2: GE Healthcare spin-off (January 2023). GE Healthcare Technologies was separated via a combination of an IPO (GE sold a minority stake to public investors) and subsequent spin-off of the remaining stake to GE shareholders. The healthcare entity established its own management team, board, capital structure (target 3-3.5x leverage), and equity listing on NASDAQ. The Form 10 filing provided detailed standalone financial statements that allowed investors to value the healthcare business independently for the first time.

Phase 3: GE Vernova spin-off (April 2024). The final separation distributed GE Vernova shares to GE shareholders, with the energy business becoming a standalone NYSE-listed company. The distribution was structured as a tax-free spin-off under Section 355 of the Internal Revenue Code, allowing GE shareholders to receive their Vernova shares without triggering capital gains tax. The tax-free qualification is a critical structural requirement for most industrial separations because a taxable spin-off would destroy significant value.

Phase 4: Post-separation optimization (2024-2026). Each entity pursued focused strategic initiatives post-separation. GE Aerospace invested aggressively in the LEAP aftermarket. GE Vernova positioned itself as a pure-play energy transition company. GE HealthCare pursued medtech-focused M&A. The "portfolio liberation" effect, where each business can pursue its own strategy without competing with siblings for capital and management attention, is the ongoing value-creation mechanism that persists beyond the initial separation.

The total timeline from announcement to final separation was approximately 2.5 years. The advisory workstreams spanned strategy (McKinsey, BCG), investment banking (Goldman Sachs, JPMorgan, Morgan Stanley, and others across different roles), legal (multiple law firms for tax, securities, regulatory), and capital markets (debt refinancing for each entity, equity distribution mechanics). The cumulative advisory and professional fees across the full GE separation are estimated at $300-500 million, making it one of the largest fee-generating events in industrials banking history.

Emerson's approach differs from GE's and Honeywell's complete breakups. Rather than splitting into separate public companies, Emerson has executed a targeted transformation: divesting non-core businesses (selling Climate Technologies/Copeland to Blackstone for $14 billion, completing the sale of remaining interests in 2024) while simultaneously acquiring capabilities aligned with its focus (National Instruments for $8.2 billion in 2023). The result is a company that has evolved from a diversified conglomerate into a focused automation and process control platform, without the full separation complexity.

Emerson's strategy illustrates the alternative to full breakup: selective portfolio reshaping through targeted divestitures and acquisitions. This approach works when the company has a clear "core" business around which to build (automation, in Emerson's case) and when the non-core businesses can be sold to buyers who value them more highly than the conglomerate's blended multiple implied.

Danaher has been the most prolific separator in industrials, having spun off Fortive in 2016 and Veralto in 2023 while simultaneously transforming its remaining business from diversified industrials into focused life sciences and diagnostics. Each separation was timed to coincide with a strategic refocusing: Fortive took the industrial technology businesses, Veralto took the water quality and product identification businesses, and the remaining Danaher concentrated on higher-growth, higher-margin life sciences.

The Danaher approach demonstrates that separation can be a proactive strategic tool (used to sharpen focus and improve capital allocation) rather than solely a defensive response to activist pressure. Danaher initiated its separations before activists demanded them, which allowed management to control the timing, structure, and narrative rather than operating under the pressure of an activist campaign.

European industrial conglomerates are following the US separation trend with a lag of several years, driven by the same underlying forces (conglomerate discount, activist pressure, investor preference for pure plays) but constrained by different institutional factors.

Siemens has been the most proactive European separator. The company listed Siemens Healthineers in 2018 (retaining a majority stake that it has gradually reduced), spun off Siemens Energy in 2020, and sold its portfolio company Siemens Gamesa into Siemens Energy. The remaining Siemens AG is a significantly more focused company centered on industrial automation (Siemens Digital Industries) and smart infrastructure, though it still retains more segment diversity than most US pure-play peers.

ABB divested its Power Grids business to Hitachi for approximately $11 billion in 2020, transforming from a four-division conglomerate into a more focused electrification, motion, process automation, and robotics company. ABB's post-divestiture stock performance has been strong, though the company retains more diversification than investor activists would prefer.

Thyssenkrupp (Germany) represents the most challenging European separation case. The company's steel and automotive technology businesses have fundamentally different risk profiles, capital requirements, and investor bases, creating a classic conglomerate discount. However, German co-determination laws (requiring employee representation on the supervisory board), political sensitivity around steel industry employment, and the company's complex stakeholder structure have slowed the separation process relative to what a US company would execute.

Johnson Matthey (UK) divested its Health segment and refocused on catalysts and sustainable technologies. Smith+Nephew (UK) has faced activist pressure from Cevian Capital to simplify its portfolio. Sandvik (Sweden) separated its mining and rock technology business from its manufacturing and machining solutions.

The European separation wave creates cross-border advisory opportunities for US banks with European presence. When Siemens Energy was spun off, US-based institutional investors became significant shareholders, requiring US-based coverage and potentially creating opportunities for US banks to advise on the new entity's M&A strategy. As more European conglomerates separate, the number of pure-play European industrial companies available for cross-border M&A with US counterparts increases, generating additional deal flow for banks with transatlantic coverage capability.

Beyond the announced separations, analysts and activists maintain a "watch list" of industrial conglomerates that may be candidates for future breakups based on their conglomerate discount levels, segment diversity, and vulnerability to activist pressure. While specific predictions are speculative, the structural factors that drove the GE, Honeywell, and 3M separations (persistent discounts, activist capabilities, proven templates, and investor demand for pure plays) apply broadly to any diversified industrial company trading below its SOTP NAV.

The shrinking number of remaining large industrial conglomerates means the separation wave will eventually exhaust its target universe. But the mid-cap diversified industrial space (companies with $5-25 billion in enterprise value and 2-4 distinct business segments) represents an additional tier of potential separations that has barely been touched. These smaller conglomerates may not attract the attention of mega-cap activists like Elliott, but they are well within the scope of PE-driven divestitures where a sponsor acquires one segment via a carve-out rather than separating the entire company.

The breakup era has fundamentally changed industrials banking in three ways.

Separation advisory is now a core competency. Banks that can execute complex industrial separations (involving standalone financial preparation, ITAR/security considerations for defense segments, capital markets execution, and multi-year transition management) have a structural advantage in winning conglomerate clients. Goldman Sachs, JPMorgan, and Morgan Stanley have invested heavily in separation execution capabilities.

The conglomerate client base is shrinking. As conglomerates separate, the resulting pure-play entities become clients of different coverage teams. The industrials banker who covered "Honeywell" now may cover only one of the three separated entities, while the other two are covered by aerospace-dedicated or materials-dedicated teams. This reshuffling of coverage relationships creates both opportunities and disruption within banking organizations, as senior bankers must rebuild client relationships with the new pure-play management teams.

Each separation teaches the next one. The GE execution playbook (staggered separation, Form 10 filing timeline, tax-free Section 355 qualification, debt allocation methodology, TSA structure) has become the reference template for subsequent separations. Honeywell's advisors explicitly studied the GE playbook and adapted it for Honeywell's specific circumstances. This "learning curve" effect means that separation execution is becoming faster and more efficient as the industry accumulates experience. What took GE 2.5 years may take Honeywell 1.5-2 years because the structural, legal, and capital markets playbooks are now well-established.

Post-separation M&A accelerates. Each newly independent entity typically pursues focused M&A that was constrained within the conglomerate structure. GE Aerospace is investing aggressively in the engine aftermarket. Emerson's post-divestiture acquisition of National Instruments demonstrated the "simplify then focus" strategy. This post-separation M&A creates a second wave of advisory mandates that follows the initial separation fees.