Everyone has been noting the supply chain's stress - this stress is creating opportunities. And who better to jump into that opportunity than private capital? The entry of Bain Capital alongside Audax Private Equity into FDH Aero is part of a massive, multi-year structural wave. Private equity has aggressively stepped into the aerospace supply chain, treating tier-2/3 components, parts distribution, and MRO providers as highly resilient, cash-generative infrastructure. While a specific "exact number" of total PE firms fluctuates constantly as smaller mid-market funds buy local machine shops, there are at least 15 to 20 major, dominant private equity firms that have institutionalized aerospace supply chain roll-ups. The primary players who have built massive footprints alongside Bain and Audax can be classified by their investment strategies: The Aerospace Specialists (The Pure-Play Roll-Ups) These funds treat the aerospace supply chain as their core thesis, buying up fragmented tier-3 components suppliers and integrating them: AE Industrial Partners (AEI): Perhaps the most prolific specialist in this sandbox. They manage billions focused entirely on aerospace, defense, and supply chain. Significant platforms include Belcan (aerospace engineering/supply chain consulting), Kellstrom Aerospace (commercial aftermarket distribution), and Cross-Fire. Greenbriar Equity Group: Deeply entrenched in aerospace distribution and component logistics. Notable legacy and current plays include Align Aerospace (hardware/fastener supply chain management), Whitcraft Group (merged to form Paragon Medical/Consolidated Aerospace Manufacturing), and Bahr Dashboard. Liberty Hall Capital Partners: A mid-market PE firm built specifically to execute aerospace supply chain roll-ups. They created Accurus Aerospace (machined components and assemblies) and built out Bromford Industries and Composites Horizons to consolidate engine component manufacturing. The Mega-Funds (The Macro Consolidation Plays) When supply chain platforms scale past a certain point, the largest institutional asset managers step in to finance global expansion: The Carlyle Group: A historical heavyweight in this space. Their crowning supply chain/MRO achievement was StandardAero, one of the world's largest independent MRO providers for commercial and military aviation, which they scaled extensively through acquisitions before taking it public. Veritas Capital: Known for deep integration across aerospace, defense, and technology. A massive supply chain/advanced manufacturing play under their belt is Chromalloy, which provides advanced component manufacturing and repairs for turbine engines. Advent International: Famous for mega-aerospace consolidations, notably acquiring UK-based Cobham and Ultra Electronics, restructuring their global supply chains, and spinning off specific defense and commercial aviation component divisions. Warburg Pincus: Highly active in aviation technology, logistics, and supply chain software, famously backing Accelya (aviation software and financial supply chain infrastructure) and Camp Systems (aircraft maintenance tracking and component supply chain software). The Mid-Market Aerospace Integrators These firms target family-owned or founder-led manufacturing shops producing highly specialized components (e.g., forgings, fasteners, surface treatments) that the OEMs depend on: Vance Street Capital: Highly focused on highly engineered tier-2/3 aerospace component manufacturers (e.g., JetParts Engineering, Aviation Technical Services). Arlington Capital Partners: Focuses heavily on aerospace and defense supply chains, investing in advanced materials, electronics, and precision components that feed directly into commercial and military airframes. JBT (John Bean Technologies) / Various Mid-Market Aggregators: Constantly consolidating airport ground support equipment and logistical supply lines. Why Now, and Why It Matters The logic is straightforward: with aircraft delivery horizons stretched years out, whoever controls specialized component suppliers and distributors holds real pricing power over MRO facilities, lessors, and airlines scrambling to keep aging fleets airworthy. The OEM backlog doesn't just create stress — it creates leverage for anyone upstream. Bain and Audax doubling down on FDH Aero confirms that capital markets view parts distribution as a defensible moat in an environment defined by duopoly delivery constraints. But the more consequential dynamic is what comes next. As PE firms accumulate platforms, consolidation pressure mounts — redundant back-office functions get stripped, weaker operators get absorbed, and critical mass becomes the only viable competitive position. The RTX model is instructive: an organization large enough that OEMs simply cannot squeeze it the way they squeeze the rest of the chain. That's the endgame being constructed here — not just financial returns, but a structural shift in who holds economic power across the aerospace supply chain. The stress falls hardest on the smallest players. Capital concentrates upward. And the deals keep coming.