In the first half of 2026, 23% of strategic investments in smart building startups involved a major industry player, participating either as sole investor or as part of a funding round. The incumbents are no longer observing the startup ecosystem from a safe distance. They are actively shaping it.
Our new report, Startups in Smart Buildings H1 2026, analyzes 8 key players building relationships with new entrants: ABB, Allegion, Carrier, Honeywell, JLL, Johnson Controls, Schneider Electric, and Siemens. Together, they span building automation, real estate services, HVAC equipment, and physical security, and their behavior over the past six months reveals a market entering a decisive new phase.
From Minority Stakes to Full Ownership
The most important shift is one of posture. Strategic buyers are moving beyond cautious minority investments toward co-development partnerships, outright acquisitions, and platform consolidation, investing in successful firms and picking up struggling smart building startups through asset purchases at favorable prices.
Johnson Controls is the clearest example. In six months, it completed two acquisitions and two investments: leading a $65 million Series B for liquid-cooling specialist Accelsius, acquiring data center component maker Alloy Enterprises, buying Nantum AI to extend its OpenBlue digital ecosystem, and joining Armada’s $230 million Series B alongside a global framework agreement for modular data centers.
Three of those four deals touch data center infrastructure, a theme running through nearly every incumbent’s portfolio in 2026, as the AI boom drives unprecedented demand for power and cooling technology.
Every Incumbent Has a Different Playbook
What makes this landscape fascinating is how differently each player approaches the same opportunity.
Schneider Electric backed three startups in H1 2026, from solid-state circuit breakers (AlpSemi) to clean-energy grid technology (Uplight) and AI-powered geospatial analytics (Forerunner).
Carrier doubled down on thermal management, expanding its stake in waterless liquid-cooling provider ZutaCore before joining its $100 million Series C in June.
ABB runs a business-led venture model, with ABB Ventures having deployed roughly $500 million into smart building startups, alongside its Startup Challenge that pairs winners directly with ABB business units.
JLL Spark, the real estate services giant’s venture arm, has invested more than $445 million across 55+ PropTech startups, and has notably shifted its focus toward the earlier stages of the building lifecycle, backing architecture and design platforms like Acelab.
Allegion has quietly built one of the sector’s most active corporate venture records, with 13 investments, 4 acquisitions, and 4 partnerships involving smart building startups since 2019.
Even Honeywell, occupied with spinning off its automation businesses into a new public company, found time to strike a strategic collaboration with cloud video startup Rhombus.
What Does this Mean for the Smart Building Startups Market?
For founders, this is the map of your most likely acquirers and strategic partners, and the evidence suggests the exit window is still open. For investors, incumbent participation in a round has become a meaningful signal of which technologies the industry itself believes in. And for building owners and operators, the technology roadmaps of these 8 companies are increasingly being written by the smart building startups they back today. The incumbents have placed their bets. The only question that remains is which of today’s startups will be tomorrow’s platforms, and who will own them.
Our full report maps every strategic investment, acquisition, and partnership by the 8 incumbents from 2022 through June 2026, including detailed relationship timelines by technology category, alongside complete H1 2026 funding and M&A data for the entire smart buildings startup landscape.
Explore the full report here, and if you missed the first article in this series on the 80% funding rebound, catch up here.
