United States Mutual Fund - Market Share Analysis, Industry Trends & Statistics, Growth Forecasts (2026-2031)

The united states mutual fund market size in terms of assets under management value is expected to increase from USD 30.09 trillion in 2025 to USD 31.82 trillion in 2026 and reach USD 42.12 trillion by 2031, growing at a CAGR of 5.76% over 2026-2031. This report is Segmented by Fund Type (Equity, Bond, Hybrid, Money Market, Others), Investor Type (Retail, Institutional), Management Style (Active, Passive), and Distribution Channel (Online Trading Platform, Banks, Securities Firm, Others). The Market Forecasts are Provided in Terms of Value (USD).

United States Mutual Fund Market Trends and Insights

SECURE 2.0 Auto-Enrollment and Auto-Escalation Catalyze Default Flows

The SECURE 2.0 provisions, effective for plan years beginning in 2025, make automatic enrollment a core feature for new 401(k) and 403(b) plans, which channels new participants into qualified default investment alternatives that are typically target-date mutual funds in smaller and mid-sized plans. Default contribution rates, annual auto-escalation, and employer-plan expansion together create steady, rules-based contributions that compound inside diversified mutual fund sleeves aligned to participant age cohorts. This reshapes the near-term demand profile of the United States mutual fund market because a larger base of participants now enters plans through defaults that prioritize low-cost and transparent options. Defined contribution assets already anchor retail participation, and higher participation rates magnify the flow-through to target-date funds and core index building blocks in the United States mutual fund market. Fiduciary guidance around defaults and plan oversight reinforces the need for consistent, scalable building blocks in QDIAs, which favors established complexes with broad passive and active toolkits. As new cohorts enter plans under auto-enrollment, the weight of these flows becomes a durable support to the United States mutual fund market growth over the forecast period.

Heightened Fiduciary Standards Accelerate Migration to Low-Cost Lineups

The Department of Labor’s Retirement Security Rule, finalized in April 2024, tightened the definition of fiduciary investment advice, which elevates scrutiny on rollover recommendations and fee reasonableness in plan menus and advice practices. In parallel, the SEC’s Regulation Best Interest and the Commission’s 2026 examination priorities keep cost, conflicts, and process at the center of retail advice oversight, which steers advisors and plan sponsors toward lower-cost mutual fund share classes and index-aligned solutions. This compliance environment rewards managers who can deliver plain-vanilla exposures at scale while preserving target-date and core fixed income solutions that satisfy fiduciary prudence tests in retirement channels. The practical effect is a continued migration from high-fee share classes to institutional and R6 classes in plans, along with an expanding toolkit of low-fee options on advisor platforms that streamline fiduciary documentation. These forces are structurally supportive of the United States mutual fund market because they align cost discipline, transparency, and default usage in ways that reinforce persistent asset retention in retirement accounts.

Accelerating Mutual Fund-to-ETF Conversions Siphon Assets

A record wave of mutual fund-to-ETF conversions in 2025 demonstrated advisor and investor preference for tax efficiency, intraday liquidity, and lower fees inside ETF wrappers supported by in-kind creation and redemption mechanics. Several large managers executed or announced conversions and share-class innovations that make the ETF vehicle available without sacrificing track records, including exemptive relief for ETF share classes within existing funds. Empirical work by the Federal Reserve has linked the growth of ETF ownership to lower underlying stock price volatility and narrower bid-ask spreads, which supports the structural appeal of the ETF format to advisors building model portfolios. Conversions are often accompanied by fee cuts, which intensify competitive pressure on legacy mutual funds and accelerate migration in the United States mutual fund market. As more managers pursue either full conversions or multi-share-class structures, net flows continue to tilt toward ETFs, which weighs on long-term mutual fund totals even as retirement plan use of mutual funds remains resilient.

Other drivers and restraints analyzed in the detailed report include:

• Structural Cash Migration Toward Government Money Market Funds Sustains MMF AUM
• Index Mutual Funds’ Share Gains in Retirement Channels Support Passive Growth
• Collective Investment Trusts Erode Mutual Funds’ Retirement Plan Franchise

For complete list of drivers and restraints, kindly check the Table Of Contents.

Segment Analysis

Equity funds commanded 52.18% of the United States mutual fund market share in 2025, while other funds are projected to grow fastest at a 8.17% CAGR during 2026-2031. Money market totals were elevated by policy and institutional preferences for government vehicles after 2023 reforms, a baseline that moderates the pace of outflows if yields compress. Long-term mutual fund outflows in 2025 contrasted with stabilizing conditions ahead, as retirement default dynamics and fee reductions offset some active equity pressure in the United States mutual fund market. Equity index suites retain material cost advantages over active peers, which shapes the core building blocks in model portfolios and target-date glide paths.

Within equity, advisor models continue to pair broad-market index cores with selective active satellites in areas where research intensity may add value, while fixed income sees a more balanced active-index mix because credit selection and duration positioning can justify moderate active fees. Money market funds hold a durable role inside brokerage sweep and institutional liquidity programs despite potential rate normalization, which supports a large cash base in the United States mutual fund market. Bond allocations benefit from demand for intermediate taxable and municipal exposure as savers look for durable income with limited volatility. In this setting, the United States mutual fund industry faces a measured shift from equity-led growth toward a more balanced asset mix as income needs rise. Managers with scaled core bond index options and credible active fixed income franchises are positioned to capture the rotation over the forecast period.

Retail households controlled 88.27% of assets in 2025, and a great portion of their long-term mutual fund holdings sat in retirement accounts, which ties aggregate participation to plan defaults, employer matching, and fiduciary oversight. These features make retail flows systematic and persistent, especially where auto-enrollment places new savers into target-date mutual funds aligned to age cohorts. Retail growth is projected at a 6.02% CAGR through 2031, while institutional flows display greater tactical flexibility across cash and short-duration bond funds inside the United States mutual fund market. Regulators continue to emphasize fiduciary process and cost control in retail advice, which reinforces the cost-sensitive patterns visible in plan menus and RIA models.

Distinct behaviors persist by channel and objective. Institutional users treat government MMFs as overnight liquidity tools and rotate duration based on rate paths and corporate cash cycles. Retail cohorts diversify slowly through defaults and lifestyle solutions like target-date funds, which sustain multi-decade relationships for recordkeepers and large fund families in the United States mutual fund market. Advisors and plan sponsors maintain a preference for standardized, low-cost building blocks that simplify monitoring and documentation under ERISA and Reg BI expectations. Over time, these patterns support the stability of retail assets while leaving tactical opportunity and liquidity management to institutional accounts that move between cash and short-duration fixed income exposures.

Complete Report Scope:

• By Fund Type
  • Equity
  • Bond
  • Hybrid
  • Money Market
  • Others
• By Investor Type
  • Retail
  • Institutional
• By Management Style
  • Active
  • Passive
• By Distribution Channel
  • Online Trading Platform
  • Banks
  • Securities Firm
  • Others

List of Companies Covered in this Report:

• Vanguard
• Fidelity Investments
• BlackRock
• Capital Group (American Funds)
• T. Rowe Price
• JPMorgan Asset Management
• Franklin Templeton
• Invesco
• Charles Schwab Investment Management
• State Street Global Advisors
• Dimensional Fund Advisors (DFA)
• PIMCO
• Janus Henderson Investors
• AllianceBernstein (AB)
• MFS Investment Management
• Columbia Threadneedle Investments
• PGIM Investments (Prudential)
• Goldman Sachs Asset Management
• Morgan Stanley Investment Management
• Dodge & Cox

Additional Benefits:

• The market estimate (ME) sheet in Excel format
• 3 months of analyst support