US ETF AUM to surpass $25 trillion by 2030, says Citigroup

Citigroup projects US ETF assets under management could exceed $25.0 trillion by 2030 versus $10.4 trillion as of March 2025, implying roughly a 140% increase in AUM. The upgrade is driven by strong inflow momentum and rising investor preference for lower-cost ETF vehicles, a constructive signal for asset managers and ETF product providers.

Analysis

The secular shift to ETFs disproportionately benefits infrastructure owners and scale operators rather than headline fund brands: exchanges (margin on increased trading and options), custodians and transfer agents (fee-for-service on larger AUM), index providers (licensing), and the few issuers that already dominate ETF distribution. Fee compression means per-dollar economics for issuers will fall, so the asymmetric winners are businesses with revenue streams that scale by transactions or custody fees (ICE, CBOE, BK) rather than pure asset management margin. Expect vendor ecosystems (indexing, portfolio construction software, white‑label ETF platforms) to see M&A and cross‑sell opportunities; that increases spending into SS&C/tech stacks with recurring SaaS-like revenue, tightening competitive moats for firms that integrate end‑to‑end services.

Tail risks are non-linear and concentrated in market-structure events: a rapid risk‑off that forces passive rebalancings could amplify selling into illiquid small-cap constituents, creating transient liquidity premiums and reputational hits for issuers. Regulatory interventions (cap on in-kind creations, changes to arbitrage mechanics) or aggressive fee wars could meaningfully reduce margin per AUM within 12–36 months. Near term (days–months) we should watch monthly/quarterly rebalancings and ETF creation/redemption flows as catalysts for trading-volume surges; medium term (1–3 years) monitor product saturation and active managers reclaiming flows with better alpha delivery or ETF wrappers.

Construct trades that overweight infrastructure leverage and underweight commodity active managers: prefer exchange and custody exposures for asymmetric upside to continued flow growth, hedge with volatility or short active-manager exposure to capture fee compression. Specific option overlays (long dated call spreads on exchange names, small VIX call spreads as insurance) reduce capital at risk while preserving upside if flows accelerate. Treat bank research houses and sell-side facilitation (C) as tactical beneficiaries of underwriting and advisory fees from new-product issuance — use a small directional options position rather than large equity exposure to reflect modest per‑ticker impact.

Contrarian risk: the consensus assumes linear AUM-to-income conversion and underestimates crowding into top index weights, which increases systemic liquidity mismatches in stress. If passive ownership approaches critical mass in a handful of securities, market-makers will price liquidity risk into spreads and volumes may become more episodic, benefiting exchange and custody margins but reducing steady-state trading revenues for asset managers. Position accordingly: play the plumbing and volatility hedge, not the headline asset managers whose margins are most exposed to compression.

Key Decisions for Investors

• Long ICE (Intercontinental Exchange) 12–18 month call spread: buy the 12–18M OTM calls and sell a higher strike to fund ~50–70% of the premium. Rationale: captures transaction and listing fee upside with limited premium outlay. Target: +25–40% on spread if ETF volumes accelerate; max loss = premium paid (~2–4% portfolio slice cap).
• Long BK (BNY Mellon) or STT (State Street) 12 month equity positions sized 3–5% each: these custodians scale fees with AUM and are less sensitive to fee compression. Target: 20–30% upside if flows continue; stop-loss at -12–15%.
• Pair trade (12 months): long BLK (BlackRock) 6–12 month calls / short TROW (T. Rowe Price) equity sized 1–2% net exposure. Rationale: capture issuer scale vs active manager outflows. Target: pair outperforms by 20%+; cap downside with protective puts if funding >3% portfolio.
• Tail hedge: buy 3–6 month VIX call spread (small notional <2% portfolio) to protect against forced passive rebalancing events that spike volatility. Rationale: limited cost to guard against episodic liquidity shocks that would temporarily reverse ETF flows and widen spreads.