Reading promoter and insider buying
The answer
People inside a company sell for many reasons and buy for only one. That makes insider buying a weak positive signal and insider selling almost no signal at all. The most misread number of all is the promoter's percentage — which can fall without the promoter selling a single share.
Why this costs you money
Here is the mistake, and it is made by careful people.
You are checking a company. The shareholding pattern shows promoter holding at 62% a year ago and 54% today. Eight percentage points gone. You conclude the family is getting out, and you sell.
Except they sold nothing.
The company issued new shares — a fundraising, a merger, shares to employees. The total number of shares went up, so the promoter's slice got smaller while their holding stayed identical. This is dilution, not exit, and the 2 mean opposite things.
The reverse error is just as expensive. A promoter's percentage rises and you read it as confidence. But it may have risen because the company bought back its own shares, which shrinks the denominator, or because they crept up 1% for control reasons rather than because they think the stock is cheap.
The percentage is a ratio, and a ratio can move because either half moved. Every article you have read that says "track promoter holding" leaves out the step that makes it meaningful.
How it works
Insiders are legally required to disclose their trades in their own company. This is the lawful counterpart to the previous article: the information insiders may act on is restricted, but their actions themselves are published.
Not all insider activity carries the same weight. Ranked, strongest first:
| What you see | How much it is worth |
|---|---|
| Several unrelated insiders buying in the open market with their own money, in size that matters to them | The strongest version of a weak signal |
| One senior insider making a large open-market purchase | Worth noticing |
| Promoter increasing stake through open-market purchase | Worth noticing, but check the motive |
| Shares acquired through employee stock options | Nothing. It is compensation, not a decision |
| A single small purchase around results | Close to nothing. Sometimes it is optics |
| Any insider selling | Almost nothing, on its own |
The asymmetry is the whole idea. There are a dozen innocent reasons to sell — buying a house, paying tax, a divorce, diversifying a fortune that is 90% in one company, options that are about to expire. There is one reason to spend your own money buying more of something you already own too much of: you think it is worth more than it costs.
That is why the signal is one-directional. It is not that selling is meaningless. It is that the noise is so much louder than the signal that you cannot separate them.
What it tells you, and what it does not
Insider buying tells you about belief, not about outcome. The person spending their own money genuinely thinks the stock is cheap. They also thought so at every earlier price, and being close to a business does not make anyone a good forecaster of its share price. Some of the most confident insider buying in history happened on the way to zero.
It tells you nothing about timing. Insiders are typically early, sometimes by years, because they are buying against a view of the business rather than a view of the market.
And in India it does not, on its own, tell you the promoter is committed. A promoter with a high pledge percentage may be buying to support a price they cannot afford to see fall — which is not confidence, it is defence.
The decision rule
Insider buying is a reason to look harder at something already on your list. It is never a reason to buy something you have not analysed.
When you see it, ask 3 questions:
- Open market, or an option exercise? Only the first involves a decision.
- How big, relative to that person's own wealth? A director earning ₹5
crore a year buying ₹8 lakh of stock has made a gesture. Buying ₹4 crore has made a decision.
- One person, or several unconnected people? A single buyer can be
signalling. A finance head, an independent director and a divisional CEO buying in the same month is harder to stage.
And when you see insider selling, do almost nothing with it — unless it is heavy, sustained, by several people, and accompanied by something else.
Try this now
This is the check that separates dilution from an exit, and it takes 90 seconds.
- Open the shareholding pattern for one of your holdings on the NSE or BSE site, or in your app's shareholding section.
- Make a small table for the last 4 quarters. For each quarter record 2 things, not 1:
- Promoter holding as a percentage
- Promoter holding as a number of shares
- Now compare the 2 columns.
What you should see. One of 3 patterns:
- Percentage falls, share count unchanged — the promoter sold nothing. The company issued new shares. This is dilution, and the question to ask is what the company did with the money.
- Percentage falls, share count falls — the promoter genuinely sold. Now ask how much, and whether there is a disclosed reason.
- Percentage rises, share count rises — the promoter bought. Check whether it was an open-market purchase or a preferential allotment to themselves, which is a different thing entirely.
While you are there, note the pledge column from the previous article. A promoter buying while their pledge is climbing is a different story from a promoter buying with no borrowing behind them.
Three real cases
1. Jamie Dimon, February 2016 (United States) — size relative to the buyer During a sharp market selloff, JPMorgan's chief executive bought roughly $26 million of his own company's stock in the open market. The purchase was disclosed on a Form 4. The stock bottomed within weeks and rose substantially over the following years. What made this a signal was not that he bought — it was the size, in his own money, at market price, at a moment of maximum pessimism.
2. Lehman Brothers, 2007-2008 (United States) — insiders are not oracles Lehman's executives held enormous quantities of their own company's stock, and its chief executive is widely reported to have lost the great majority of a personal fortune held in it. They were not lying and they were not selling. They were wrong. Proximity to a business tells you what the management believes; it does not tell you what is true.
3. The March 2020 fall (India) — the pattern worth knowing During the sharp fall of March 2020, open-market purchases by promoters across Indian listed companies rose noticeably as prices collapsed. Many of those purchases looked very good in hindsight. The honest caution is that they looked identical, in real time, to the promoter purchases in earlier falls that did not recover. The pattern is worth watching; it was never a guarantee.
The question that resolves it
A novice sees promoter holding fall and asks: are they getting out?
An expert asks: did the numerator move, or the denominator?
That is the entire difference between reading a shareholding pattern and guessing from one.
What would make this wrong
If insider buying carried no information, then portfolios built from disclosed insider purchases would perform like the market. Across long periods and several markets, the academic research generally finds a modest positive effect from insider purchases, and much less from sales — which is exactly the asymmetry described here.
The limits matter more than the finding.
The effect is modest. It is a tilt, not an edge. Any strategy of buying whatever insiders bought, without analysing the business, will produce a portfolio of companies whose managements were optimistic — which is all managements.
It also decays. The disclosure is public, and by the time you read it, so has everybody else.
And it can be gamed. A small, well-publicised purchase before a fundraising is an inexpensive way to look confident. The size test in the decision rule exists because of this.
In India
The promoter concept is central to Indian markets and has no close US equivalent. Most Indian listed companies have an identifiable controlling family or group, disclosed as promoters, whose holding is reported separately every quarter.
That gives you a lens American investors do not have. Promoter holding, promoter pledging and promoter transactions are all published together, and together they describe the position of the people who actually control the company.
Three Indian specifics:
- The shareholding pattern is quarterly, so the aggregate view is a lagging one. Individual insider disclosures under the PIT regulations are more timely.
- Creeping acquisition. Under the takeover regulations, a promoter above a threshold may increase their stake by a limited amount each financial year without triggering an open offer — 5% in a financial year for a holder between 25% and 75%. Buying that stops neatly at that limit is about control, not valuation.
- Preferential allotment. A promoter increasing their stake through shares issued to them directly by the company is not the same as buying in the open market. The percentage rises; no conviction was demonstrated at a market price.
In the United States
Form 4 must be filed within 2 business days of an insider transaction, which makes US insider data close to real time — far more usable than a quarterly aggregate.
Two features shape how it reads:
- Rule 10b5-1 plans. Insiders can pre-schedule sales months in advance. A sale executed under such a plan is disclosed as such and tells you nothing about current opinion. Filtering these out removes a large part of the noise.
- No promoter category. Most large US companies are widely held with no controlling family, so there is no equivalent of promoter holding to track. The analogous filings are 13D and 13G, filed when an investor crosses 5%, which reveal activist and large institutional positions instead.
Insider selling in the US is also mechanically heavier than in India, because so much executive pay is in stock. An executive selling every quarter may simply be converting salary into money.
Where they differ, and what that tells you
The United States gives you individual transactions within 2 days. India gives you a quarterly picture of a controlling group.
What that tells you is that the same signal should be used differently in each market. In the US, insider buying is close to a live event, and the appropriate use is to notice a cluster of purchases and go and read the business. In India, the promoter data is slower but describes something the US data cannot: whether the people who control the company are increasing their commitment, reducing it, or borrowing against it.
The Indian version is less timely and more structural. Used properly, promoter holding, promoter pledging and promoter transactions read together tell you the financial position of the controlling family — and in a market where families control most listed companies, that is frequently the most important thing about the investment.
Carry this
- They sell for many reasons and buy for one. Weight the 2 accordingly.
- Percentage is a ratio. Check the share count before concluding anything.
- Open market with their own money, in meaningful size, by several people — that is the version worth noticing.
- Buying is a reason to look harder, never a reason to buy.
Knowledge check
Related
- Insider trading and material non-public information
- The regulator, and what it does not protect you from
- What a shareholder is actually entitled to
- ← How the market works