Concepts· 5 min read· Updated April 2026

What a fund manager actually does — and what happens when a good one leaves

Behind every active mutual fund is a human making decisions with your money. Here is what the job involves, how to evaluate one, and what to do when they resign.

Key takeaways
Fund managers research companies, meet management, and decide what to buy and sell
A manager change is a significant event — monitor performance for 12–18 months after
Consistent long-term benchmark outperformance matters more than 1-year ranking
Index funds eliminate fund manager risk entirely — a structural advantage
The best managers communicate clearly about their investment thesis
📌
When Prashant Jain left HDFC AMC
Prashant Jain managed HDFC Equity and HDFC Top 100 for over 19 years — one of the longest tenures in Indian mutual funds. When he resigned in June 2022, both funds saw significant redemptions in the following months. Investors who trusted those funds were actually trusting Prashant Jain's specific judgement and process. The fund name on the door was the same. The person making decisions changed completely.

What a fund manager actually does in a day

A typical large AMC fund manager manages ₹5,000–₹50,000 crore: • Reads quarterly and annual reports of portfolio companies • Meets company management teams — site visits, quarterly calls • Analyses industry data and competitive dynamics • Debates position sizing with analysts: 'Should we be 5% or 8% in this stock?' • Monitors macro factors — RBI policy, global commodity prices, currency • Reviews portfolio against benchmark — where are we overweight/underweight? Supported by 5–10 dedicated sector analysts covering different industries.
How to evaluate a fund manager — the 4 checks
1. Tenure: Has the manager run this specific fund for 5+ years? Tested through at least one market cycle? 2. Consistency: Are rolling 5-year returns consistently above the benchmark? Or just one amazing year? 3. Benchmark behaviour: During the 2020 crash, did the fund fall less than the benchmark? (Risk management) 4. Communication: Does the manager write clear monthly/quarterly commentary explaining their thesis? Transparency is a proxy for quality.
Active fund (manager risk) vs index fund (no manager risk)
Active fund — manager-dependent
Returns depend on one person's skill and consistency
Manager can resign, retire, or lose their edge
Style drift: may change investment approach over time
Justified if: consistent 10-year benchmark outperformance
Worth monitoring: any manager change, strategy shift
Index fund — no manager risk
Returns track the index — no human key-person dependency
No resignations, no 'losing form', no strategy changes
Mechanically rebalances to stay true to index
Lower cost (0.1% vs 1%+)
Best for large-cap core allocation where alpha is hard anyway
Educational content only. Numbers shown are illustrative — actual returns vary. This is not investment advice. Consult a SEBI-registered financial advisor before investing.

Join the discussion

Questions, thoughts, or personal experiences — all welcome.

Be specific — it helps others.

Loading...