Multi-family offices collectively manage $5.2 trillion in assets as of December 2025, according to research from With Intelligence by S&P Global tracking 1,632 firms. The MFO segment now represents roughly 8% of total assets under global private wealth management, with consolidation activity accelerating across the sector during the fourth quarter.
The milestone follows a year in which larger platforms absorbed smaller shops at pace, driven by rising compliance costs, technology infrastructure requirements, and fee pressure from institutional-grade single-family offices building internal capabilities. With Intelligence's dataset—the largest continuous tracker of the MFO universe—shows the 1,632 firm count reflects a net decline from 1,721 entities tracked in Q4 2023, even as aggregate assets grew 14.2% over the same period. The math is clean: fewer firms managing more capital per entity, with the top 200 MFOs now controlling approximately 62% of sector AUM.
The consolidation velocity matters because it signals a structural shift in how ultra-high-net-worth families access diversified investment management. Single-family offices with $500 million or more in assets increasingly bring portfolio construction and custody in-house, leaving MFOs competing for a narrower band of families with $50 million to $400 million in investable assets. That client segment demands institutional infrastructure—fund access, tax optimization, estate planning integration—but often lacks the scale to justify full internalization. The result: MFOs require greater operating leverage, which drives horizontal mergers and vertical integration with wealth management platforms.
The timing intersects with two macro headwinds. First, public equities accounted for 41% of family office portfolios in Q4 2025, per CNBC and Addepar's newly launched Family Office Portfolio Tracker, up from 37% in 2023. The equity-heavy tilt reduces MFO differentiation, as families question paying 80-120 basis points for access they can replicate through direct indexing or separately managed accounts. Second, real estate allocations contracted to 16% of portfolios from 19% two years prior, compressing a traditional MFO value-add around commercial property sourcing and co-investment structuring.
Watch three indicators through mid-2026. First, whether the 62% share controlled by the top 200 firms crosses 65%, which historically precedes pricing power consolidation and margin expansion for survivors. Second, how many MFOs launch dedicated alternatives platforms—private credit, direct secondaries, co-GP structures—to defend against single-family office internalization. Third, regulatory filings in jurisdictions requiring MFO registration (Switzerland, Singapore, Luxembourg) as governments tighten oversight on entities managing $3 billion or more per firm.
The With Intelligence dataset will refresh in March 2026 with Q1 figures. The sector crossed $4 trillion in Q2 2023, meaning it added $1.2 trillion in roughly 30 months—a 23% compound growth rate that outpaced private banking AUM growth of 17% over the same window.
The takeaway
MFO consolidation accelerates as top 200 firms control 62% of $5.2T sector AUM; smaller shops face margin compression from tech costs and SFO internalization.
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