Investor behaviour · October 2026
Why investors sell at the bottom
Record amounts of money arrived near the top. Now the Nifty is almost 15% below its peak, and the same investors are being asked the hardest question in investing: can you do nothing?
Where we are
On 1 October 2026 the Nifty closed at 22,422, down 0.9% on the day, after touching a 2026 low of 22,217 during the session. The Sensex fell as far as 71,293, its weakest level of the year. September alone took 6.1% off the Nifty. Measured from the record high of 26,310 on 27 November 2025, the index now sits about 14.8% below its peak. Midcaps and smallcaps have fallen further, as they usually do.
The reasons given are familiar: foreign investors selling, high crude prices, rate worries. They always sound specific. They are rarely the thing that decides your returns.
The money arrived at the top
Look at where the money came from during the rally. Monthly SIP contributions crossed ₹32,000 crore for the first time in March 2026 and set a fresh record of ₹32,297 crore in August. Nearly 9.9 crore SIP accounts now contribute every month, and SIP assets have grown past ₹18 lakh crore.
Institutions did the same, at a far larger scale. Domestic institutional investors have been net buyers for 38 consecutive months, totalling about ₹20.2 lakh crore, of which ₹6.21 lakh crore came in 2026 alone. Motilal Oswal calculates that DIIs invested a record $177 billion over the past 24 months, about 23% more than the previous eight years put together.
Much of that domestic money is yours and mine, routed through funds, insurance and pension schemes. It went in steadily, and a lot of it went in when prices were high. That is not a scandal. It is arithmetic: more people invest when markets feel good, and markets feel good when prices are high.
Why the bottom is where people sell
A 15% fall does not feel like 15%. It feels like a verdict. Four forces do that work:
- Losses hurt roughly twice as much as gains please. Daniel Kahneman and Amos Tversky showed this decades ago. A portfolio down 15% produces more pain than the same portfolio up 15% produced joy.
- Recency rewrites the future. After five green months, investors expect green. After five red ones, the mind quietly extrapolates red forever.
- Crowds feel like information. When everyone is selling, staying invested feels reckless rather than disciplined.
- Action feels like control. Doing nothing is a decision, but it doesn't feel like one. Selling at least feels like taking charge.
Together these produce the pattern that costs investors most: buy when it's comfortable, sell when it isn't. The gap between what a fund returns and what its investors actually earn has a name in research circles, and it is almost always negative.
The arithmetic nobody mentions during a fall
A SIP started near the top is not a mistake that gets fixed by stopping. Its whole mechanism depends on the investor continuing when prices are lower. Every monthly instalment during a fall buys more units than the one before it. Stopping converts a temporary dip in value into a permanent reduction in units.
It is worth being honest about the discomfort. A fall of 15% from a peak is common; falls of 20% to 30% happen several times in an investing lifetime. Nobody can tell you where this one stops, and anybody who claims to is guessing with confidence.
Three questions worth asking before you sell
- Has anything changed except the price? If the businesses you own are still earning and the fund still follows the mandate you chose, the fall is a price event, not a business event.
- When do you actually need this money? Money needed within three years probably shouldn't have been in equities. Money needed in fifteen years is not harmed by a bad quarter.
- Would you buy this today? If the answer is yes, selling makes little sense. If the answer is no, the question is whether you understood what you owned when you bought it.
What patient investors do
They decided their asset allocation before the fall, not during it. They keep an emergency fund so market prices never dictate household decisions. They rebalance on a calendar, not on headlines. They check portfolios less often, because frequent checking is how volatility gets converted into anxiety.
None of this is clever. It is simply the behaviour that survives market cycles, and the reason the same arithmetic produces very different outcomes for two investors who owned identical funds.
Markets are loud. The returns go to the people who can stay quiet.
For educational purposes only. This article is not investment advice, research, or a recommendation to buy, sell or hold any security or fund. Market data as of 1 October 2026 from exchange and AMFI sources. Zeneqt is not registered with SEBI as a Research Analyst or Investment Adviser.