AUM (Assets Under Management) is the total current market value of all securities, cash, and receivables that a mutual-fund scheme, an AMC (Asset Management Company), or a portfolio manager holds and manages on behalf of investors at any given point in time.
For a single mutual-fund scheme:
AUM = NAV × Total Number of Outstanding Units
As units are purchased, AUM rises; as units are redeemed, AUM falls. AUM also changes daily due to the mark-to-market revaluation of the underlying portfolio — a rising equity market increases AUM even without new inflows.
Reporting and disclosure requirements:
AMCs in India are required to report AUM to SEBI and AMFI monthly. AMFI publishes aggregate industry AUM, AMC-wise AUM, and scheme-wise AUM on its website (amfiindia.com) within 8 business days of each month-end. As of October 2024, the Indian mutual-fund industry's total AUM stood at ₹67.26 lakh crore, up from ₹37.57 lakh crore in October 2022 — a 79% increase in two years, driven by equity inflows and market appreciation. (Source: amfiindia.com — AMFI Monthly Data, October 2024.)
What AUM does and does not indicate:
- Scale of scheme: AUM indicates the size of the scheme's investment pool. For debt funds, liquid funds, and funds holding illiquid assets, AUM is relevant to liquidity management — a very large redemption relative to AUM can move prices and affect NAV for remaining investors.
- TER linkage: SEBI's TER slabs are tiered by AUM — larger AUM results in lower maximum permissible TER for the scheme, which benefits investors. (Source: SEBI Master Circular, June 2024; sebi.gov.in.)
- Not a quality or return predictor: Higher AUM is not a signal of superior fund performance. A scheme may have large AUM due to early-mover advantage, aggressive distribution, or marketing — not necessarily because of above-benchmark returns. SEBI requires that past performance disclosures include CAGR over 1, 3, 5, and 10 years alongside benchmark comparison, not just AUM. (Source: SEBI Circular on performance advertising by mutual funds; sebi.gov.in.)
- Capacity constraints: For small-cap and mid-cap funds, very large AUM can constrain the fund manager's ability to enter and exit positions without significant market impact. AMFI data shows that some mid-cap and small-cap schemes have used the SEBI mechanism to temporarily stop accepting fresh lump-sum investments once AUM crosses a threshold the fund house considers optimal for the mandate. (Source: amfiindia.com; individual AMC scheme risk-mitigation notices.)
AMC-level AUM vs Scheme-level AUM:
AMC-level AUM is the sum of AUM across all schemes managed by that AMC. As of October 2024, the top-5 AMCs by AUM were SBI Mutual Fund, HDFC Mutual Fund, ICICI Prudential Mutual Fund, Nippon India Mutual Fund, and Kotak Mahindra Mutual Fund — each managing AUM in excess of ₹3.5 lakh crore. (Source: amfiindia.com — AMFI Monthly Data, October 2024.) AMC-level AUM scale is used for regulatory compliance purposes and does not directly influence individual scheme performance.
AUM in the context of index funds:
For index funds and ETFs, AUM does not affect the ability to replicate the index (since the fund holds the index constituents in proportion to their weights). However, for exchange-traded ETFs, low AUM can result in low liquidity on the exchange, wider bid-ask spreads, and tracking error. AMFI and AMC fact sheets typically disclose ETF average trading volume alongside AUM for this reason. (Source: SEBI guidelines on ETF liquidity; AMFI ETF fact sheets; amfiindia.com.)
Folios vs AUM:
The number of investor folios (accounts) is separately reported and can diverge from AUM trends — a scheme with many small-ticket investors may have a lower AUM than a scheme with fewer high-net-worth investors. AMFI reports both metrics monthly. As of October 2024, the industry had approximately 20.35 crore total folios. (Source: amfiindia.com — AMFI Monthly Data, October 2024.)
Related terms: NAV, TER, Direct vs Regular Plan.
Disclosure: MintByte is an AMFI-registered mutual fund distributor (ARN-314872) and an APMI-registered Authorised Person of Motilal Oswal Financial Services (APRN-01658). Content is educational.