Position Size vs. ADV Rule: The Governing Law for NEPSE
First published 23 Aug 2026 · Last verified 29 Aug 2026
Lesson 56.1 — What Average Daily Volume Actually Measures
Average Daily Volume, universally abbreviated ADV, is exactly what its name says: the average number of shares (or, in the form we will use throughout this chapter, the average rupee value) that changes hands in a given stock over one trading day, calculated as an average across some trailing window of trading days.
There are two versions of this number, and it matters which one you use.
Average Daily Volume in shares (ADV-shares) is the average number of shares traded per day. If a stock traded 40,000 shares on Sunday, 55,000 on Monday, 30,000 on Tuesday, 60,000 on Wednesday, and 65,000 on Thursday — a five-day trading week in Nepal — the ADV-shares figure is the sum of those five numbers divided by five: 250,000 divided by 5, or 50,000 shares per day.
Average Daily Value (ADV-value) is more useful for position sizing because it is denominated in the same unit as your position: rupees. It is calculated by taking the rupee turnover of the stock each day (shares traded multiplied by that day's traded price, or simply the turnover figure NEPSE and every brokerage terminal already publishes for each scrip) and averaging it over the same trailing window. If that same stock traded at an average price of around NPR 700 across those five days, its ADV-value would be roughly NPR 35 million per day (50,000 shares times NPR 700), though in practice you should sum the actual daily turnover figures rather than multiply an average price by an average volume, since the two can diverge when volume and price move together or apart on the same day.
For the rest of this chapter, when we say "ADV" without qualification, we mean ADV-value in rupees — the daily turnover figure — because that is the number you can compare directly against the rupee size of your position.
Why smooth it at all? Why not just look at yesterday's turnover?
Because any single day's turnover in a NEPSE scrip can be wildly unrepresentative. A stock might trade NPR 2 million on a quiet Tuesday and NPR 40 million the following Sunday because a bonus-share announcement hit the wire, or a large institutional block crossed, or the stock caught a wave of retail momentum after appearing on a "top gainers" list. If you sized a position off that one loud day, you would badly overestimate how liquid the stock normally is. Averaging across a window smooths out these one-off spikes and gives you a figure that reflects the stock's normal trading rhythm rather than its most exceptional day.
The professional convention — used by fund managers, broker-dealers, and risk desks worldwide, and just as applicable to NEPSE — is to calculate ADV over a trailing 20-trading-day or 30-trading-day window. Twenty trading days corresponds to roughly one calendar month of NEPSE sessions (Nepal's exchange trades Sunday through Thursday, so a calendar month typically contains somewhere between 20 and 24 trading days). Thirty trading days stretches the window to roughly six weeks, capturing a longer and even smoother picture at the cost of being slower to react to a genuine, lasting change in the stock's liquidity — for instance, after a stock graduates from the small-cap board to broader institutional attention, or after a scandal permanently scares away buyers.
For most individual investors building a position-sizing discipline, a 20-trading-day rolling average is the right default. It is short enough to reflect the stock's current liquidity regime, long enough to absorb one or two freak days without distorting your calculation, and easy to maintain by hand or in a simple spreadsheet using daily turnover figures published on NEPSE's own site or on aggregator platforms like ShareSansar, Merolagani, or NepseAlpha.
A practical note on data: NEPSE publishes daily turnover by scrip as part of its standard end-of-day market summary, and third-party aggregators republish this in more accessible formats, often with pre-built moving averages. You do not need institutional-grade data infrastructure to calculate a 20-day ADV — you need twenty numbers and a calculator, or a simple spreadsheet formula that updates as each new trading day's turnover is added and the oldest day drops off the window.
Building this data foundation takes only a few minutes a week: a simple rolling spreadsheet with one column for date, one for that scrip's daily turnover in rupees (available from NEPSE's daily market summary or any major Nepali market data aggregator), and a formula column computing the trailing 20-day average, updated weekly for every stock you hold or are seriously considering, is all the infrastructure this rule requires.
One more wrinkle specific to NEPSE deserves mention here and will matter more in Lesson 56.3: NEPSE enforces a daily circuit breaker that caps how far an individual scrip's price can move in a single session — the limit was widened to 15 percent per scrip (with market-wide trading suspended if the benchmark index itself swings 8 percent in a day) under rules that took effect in 2026, up from the narrower bands used in earlier years. This ceiling on daily price movement matters for liquidity because it means that in a genuinely illiquid, thinly traded counter, a determined seller cannot always find enough buyers to absorb a large order even at the maximum allowed downward move — the stock can simply stop trading for the day once it hits the lower circuit, with your sell order still unfilled. ADV tells you how much volume normally clears; the circuit breaker is a reminder that on a bad day, even that normal volume may not be available to you.
Lesson 56.2 — The Institutional Convention: Position Size as a Fraction of ADV
Once you have an ADV figure for a stock, the natural next question is: how large a position can I responsibly hold in it? Professional asset managers around the world — running pension funds, mutual funds, hedge funds — answer this question with a convention that has been refined over decades of painful experience with exactly the failure mode described in Chapter 55: the position that looked fine on paper and became a trap the day it needed to be sold.
The convention rests on a simple, humbling assumption: you should never plan to be more than a modest fraction of a single day's total trading volume, because if you try to sell faster than that, your own selling becomes a meaningful part of the volume — and a meaningful part of the price action. Push too much supply into a market on a given day, relative to how much natural demand exists at that moment, and the price moves against you as you sell, meaning your later shares fetch a worse price than your earlier ones. This effect has a name — market impact — and it was introduced in Chapter 54 as one of the two central costs of illiquidity (the other being the outright inability to trade at any price during a suspension or a locked circuit).
The standard institutional heuristic caps a single day's selling at somewhere between 10 percent and 25 percent of that day's ADV, with 15 percent to 20 percent being a commonly cited middle ground in professional risk literature and trading-desk practice globally. A fund that needs to sell more than that in a day, the thinking goes, will visibly move the market against itself and leave money on the table that a more patient execution would have preserved. Institutional trading desks build entire systems — algorithmic execution strategies with names like VWAP (volume-weighted average price) and TWAP (time-weighted average price) — specifically to slice a large order into pieces small enough to stay under this participation-rate ceiling across multiple sessions.
From that participation-rate ceiling, professionals derive a second, more actionable number: the maximum number of trading days it should take to fully liquidate a position without excessive market impact, given a chosen participation rate. If you are only willing to be, say, 15 percent of daily volume on any given day, then a position worth exactly one day's ADV would still take you roughly 1 ÷ 0.15, or about 6.7 trading days, to fully unwind — because on each of those days you are only selling 15 percent of that day's volume, not the whole thing. A position worth five times ADV, sold at the same 15 percent daily participation rate, would take roughly 33 trading days — more than a month and a half of continuous, careful selling — to fully exit.
This gives us the core professional formula, worth writing out explicitly because everything in the rest of this chapter builds on it:
Days to Liquidate = Position Size ÷ (Participation Rate × ADV)
Institutional position-sizing rules typically work backward from a maximum acceptable "days to liquidate" figure — often somewhere between 3 and 10 trading days for a single position, depending on the fund's mandate, how concentrated its overall book is, and how volatile the underlying stock tends to be — and then solve for the maximum position size that keeps the stock's days-to-liquidate figure under that ceiling.
The institutional convention treats a position not by its rupee size alone but by how many trading days — at a conservative daily participation rate, typically 10 to 20 percent of ADV — it would take to fully exit that position without materially moving the price. A "large" position and a "liquid" position are not the same thing; a position can be small in rupees and still illiquid if the underlying stock barely trades, and a position can be large in rupees and still perfectly liquid if the underlying stock trades enormous volume every day.
It is worth being honest about why this convention exists rather than treating it as an arbitrary rule handed down from on high. It exists because institutional investors have, collectively, lost enormous sums of money by ignoring it — by building large positions in stocks that seemed fine on the way in and discovering, on the way out, that the market for that stock simply could not absorb their selling without cratering the price. Every version of this rule, whether at a global pension fund or in the framework this chapter builds for a NEPSE retail investor, exists to prevent one specific, recurring, expensive mistake: sizing a position based on how much conviction you have in the story, rather than on how much liquidity actually exists to get you back out.
This is not a uniquely Nepali problem, either. Global fund managers have repeatedly built oversized positions in thinly traded small-cap stocks during a rising market, only to find themselves unable to exit at anything close to their marked value once sentiment turned — with forced selling into an illiquid market accelerating the very price decline they were trying to escape. The mechanism is universal; NEPSE's smaller free floats and lower overall turnover simply make the same mechanism bite harder and faster than it would in a deep, liquid market like the NYSE or LSE.
Lesson 56.3 — Deriving the ADV Rule for the Nepali Investor
The institutional formula from Lesson 56.2 is correct in principle but needs adaptation before it is usable by a serious individual investor operating in NEPSE, for three reasons.
First, institutional participation-rate conventions (10-25 percent of ADV) are calibrated for professional execution desks who can work an order patiently across a trading session using limit orders and algorithmic slicing. A Nepali retail or serious individual investor, placing orders through a standard broker interface or the Nepal Stock Exchange's own retail-facing trading system (TMS), is not going to run a VWAP algorithm. A more conservative participation rate — lower than the institutional norm — is appropriate, because your actual execution will be cruder: a handful of manually placed orders across a session, not a machine-optimized slice.
Second, NEPSE's overall liquidity is thin relative to the markets institutional conventions were built for. Total daily market turnover across all listed scrips on NEPSE has, through 2025 and into 2026, typically run in the range of roughly NPR 3 to 5 billion on an active day — small by the standards of any established regional exchange — and that turnover is heavily concentrated in a relative handful of large-cap banking, insurance, and hydropower counters, with a long tail of small-cap scrips trading a small fraction of that amount, some days not trading at all. A rule calibrated for a market where the median liquid stock does tens of millions of dollars a day in turnover will not transfer cleanly to a market where a large, well-regarded bank stock might do NPR 30-80 million in daily turnover and a small hydropower counter might do NPR 1-3 million — or nothing.
Third, and most importantly for a practical rule, the Nepali investor needs a days-to-liquidate ceiling that reflects real personal circumstances rather than a fund's redemption calendar. An institutional fund manager worries about investor redemption requests with specific notice periods. An individual investor worries about a medical emergency, a sudden need for a down payment, a margin call on a separate position, or simply losing conviction in the thesis and wanting out before the story deteriorates further. These personal liquidity needs argue for a tighter, more conservative days-to-liquidate ceiling than an institution might use — because you have no one to explain a delay to, and no mechanism to force patience on your own circumstances.
Putting these three adjustments together, here is the ADV Rule for the Nepali investor:
The ADV Rule: Do not hold a position in any single NEPSE scrip larger than the amount that could be liquidated within 5 trading days, assuming you sell no more than 10 percent of that scrip's 20-day Average Daily Value on any given day.
Written as a formula, solving for maximum position size:
Maximum Position Size = 5 days × 10% × ADV(20-day) = 0.5 × ADV(20-day)
In plain language: your maximum position size in any single scrip should be roughly half of that scrip's average daily traded value, calculated over the trailing 20 trading days.
Where do the specific numbers — 5 days, 10 percent — come from, and why these rather than the institutional 10-day, 15-percent norms?
Five trading days is a deliberately tight ceiling. In NEPSE's Sunday-to-Thursday trading week, five trading days is one full calendar week. This is a length of time a serious individual investor can reasonably tolerate as an exit horizon under normal, non-panicked circumstances — long enough to sell patiently without dumping the stock, short enough that "I need my money" does not turn into "I am trapped for a month." It is also deliberately shorter than the institutional 10-trading-day norm precisely because of the third adjustment above: an individual's liquidity needs are less predictable and less forgiving than a fund's.
Ten percent participation is deliberately conservative relative to the institutional 15-25 percent range, for the second adjustment above: because retail execution is cruder than institutional execution, and because NEPSE's per-scrip liquidity in the small- and mid-cap tail is thin enough that even a 10 percent participation assumption may be optimistic on a quiet day. Ten percent gives you a buffer — if the stock has a genuinely bad, thin day and only lets you sell 6-7 percent of its normal ADV without moving the price, your five-day exit plan stretches to seven or eight days rather than to three weeks.
Multiplying these together (5 days × 10% = 50%) produces the headline, memorable version of the rule: your position should be no larger than about half of the stock's 20-day average daily traded value.
This is a default, not a universal constant. A more risk-averse investor, or one who anticipates a genuine need for liquidity within days rather than weeks (a large planned expense, a thesis that already looks shaky, a stock with unusually high headline risk), might tighten the multiplier to 0.25 or even 0.15 of ADV — effectively demanding a 2-3 day exit horizon instead of 5. A more risk-tolerant investor with a long, patient horizon and no near-term liquidity needs might loosen it to 0.75 or even 1.0 of ADV for a core, high-conviction large-cap holding — effectively accepting a 7-10 day exit horizon in exchange for a larger position. What should not move is the underlying logic: position size is derived from the stock's liquidity, not from your conviction, and the derivation is explicit and calculable rather than a vague gut feeling of "this feels like too much."
Two calculation notes worth being explicit about. First, always use the 20-day ADV, not the current day's volume or a single recent spike — a stock that traded NPR 50 million yesterday because of a one-off announcement is not a stock with NPR 50 million of durable daily liquidity, and sizing off that one day will lead you straight back into the trap this rule exists to prevent. Second, recalculate ADV periodically — monthly at a minimum, and immediately after any news event that structurally changes a stock's liquidity (a bonus share issue that increases shares outstanding, an FPO, inclusion in or removal from a major index, a sustained shift in retail attention toward or away from the sector). A position that was appropriately sized against last quarter's ADV can become oversized within a few months if the stock's trading activity quietly dries up — which is precisely the failure pattern examined in Chapter 55's discussion of exit risk.
Lesson 56.4 — Worked Examples: The Same Rupees, Two Different Liquidity Realities
Theory earns its keep only when it survives contact with real numbers. This lesson runs the ADV Rule against two contrasting NEPSE-style positions, each involving the same headline rupee amount — NPR 15,00,000 (15 lakh) — to make the central point of this chapter as concrete as possible: identical position size, wildly different liquidity risk.
Example A: A large-cap commercial bank stock
Consider a well-established, A-class commercial bank listed on NEPSE — a scrip typical of the counters that anchor NEPSE's banking subindex, characterised by a large number of shares outstanding, broad institutional and retail ownership, and steady daily turnover across most sessions. Suppose this stock's 20-day average daily traded value is NPR 32,000,000 (a plausible figure for a well-traded large-cap bank on an active period, based on typical NEPSE banking-sector turnover patterns).
Applying the ADV Rule: Maximum Position Size = 0.5 × NPR 32,000,000 = NPR 16,000,000
A position of NPR 15,00,000 (15 lakh, or NPR 1.5 million) sits comfortably inside this ceiling — in fact, it represents less than 5 percent of the stock's daily ADV. Let's check the actual days-to-liquidate for this position at the 10 percent participation assumption:
Days to Liquidate = Position Size ÷ (10% × ADV) = 1,500,000 ÷ (0.10 × 32,000,000) = 1,500,000 ÷ 3,200,000 ≈ 0.47 trading days
In practice, this investor could exit the entire NPR 15 lakh position in well under a single trading session, participating at a fraction of the stock's normal daily volume, with minimal price impact. This is what genuine liquidity looks like: the position is a rounding error relative to the market's daily capacity to absorb it.
Example B: A small-cap hydropower or manufacturing counter
Now consider a small, thinly traded hydropower company or manufacturing counter — the kind that dominates the lower tiers of NEPSE's listed universe by count, even though each individual company represents a small share of total market turnover. Suppose this stock's 20-day average daily traded value is NPR 1,200,000 — a plausible, even generous, figure for a small-cap counter that trades on most but not all sessions, with volume that can disappear entirely for a day or two at a stretch.
Applying the ADV Rule: Maximum Position Size = 0.5 × NPR 1,200,000 = NPR 600,000
A position of NPR 15,00,000 (15 lakh) in this stock is more than double the ADV Rule's maximum — 2.5 times over the recommended ceiling. Let's check the actual days-to-liquidate:
Days to Liquidate = Position Size ÷ (10% × ADV) = 1,500,000 ÷ (0.10 × 1,200,000) = 1,500,000 ÷ 120,000 ≈ 12.5 trading days
At NEPSE's five-day trading week, 12.5 trading days is roughly two and a half calendar weeks of continuous, disciplined selling, assuming the stock's liquidity holds steady the entire time and does not dry up further the moment the investor's own selling becomes visible on the floorsheet to other market participants — a dynamic that, in a market as transparent and closely watched as NEPSE's small-cap tail, often makes real-world exit even slower than the arithmetic alone suggests, since other participants can see sustained selling pressure and simply step back from the bid.
The table below extends this comparison across a spread of NEPSE-style scrips at varying liquidity levels, holding the position size constant at NPR 15,00,000 to make the pattern visible at a glance, and then showing what the ADV Rule would actually recommend as a maximum position for each.
| Scrip Type (illustrative) | 20-Day ADV (NPR) | Days to Liquidate a Flat NPR 15,00,000 Position | ADV Rule Max Position (0.5×ADV) | Position Within Rule? |
|---|---|---|---|---|
| Large-cap commercial bank | 32,000,000 | 0.47 days | 16,000,000 | Yes — well within limit |
| Large-cap life insurer | 18,500,000 | 0.81 days | 9,250,000 | Yes — within limit |
| Mid-cap development bank | 6,000,000 | 2.5 days | 3,000,000 | No — position is 5× the rule |
| Mid-cap hydropower (established) | 3,200,000 | 4.7 days | 1,600,000 | No — position is 9.4× the rule |
| Small-cap hydropower (newer listing) | 1,200,000 | 12.5 days | 600,000 | No — position is 25× the rule |
| Small-cap manufacturing counter | 450,000 | 33.3 days | 225,000 | No — position is 66.7× the rule |
Two things stand out from this table. First, the days-to-liquidate figure does not scale gently as ADV shrinks — it explodes. Moving from the large-cap bank to the mid-cap development bank multiplies days-to-liquidate by roughly five; moving further down to the small-cap manufacturing counter multiplies it by another twenty-five on top of that. Liquidity risk is not linear; it compounds as you move down the market-cap and turnover spectrum, which is exactly why a rule pegged to a fixed rupee amount (e.g., "never put more than 15 lakh in a single stock") fails to protect an investor the way a rule pegged to ADV does.
Second, notice that the identical NPR 15 lakh position is entirely appropriate in the top two rows and badly oversized in every row below that — using the same rupee figure throughout the table exists specifically to demonstrate that position size, on its own, tells you nothing about liquidity risk without the ADV context sitting next to it.
Before entering any position, the discipline is simple to state: calculate the stock's 20-day ADV, calculate 0.5 × that ADV as your maximum position ceiling, and compare your actual planned position size against that ceiling as a multiple. If your planned position exceeds the ceiling, either shrink the position or explicitly acknowledge — in writing, in your investment log — that you are accepting an extended exit horizon and why. Lesson 56.6 builds this comparison directly into the pre-trade checklist itself.
Lesson 56.5 — Why This Rule Inverts Retail Instinct
Here is the uncomfortable part of this chapter. If you built the ADV Rule correctly, it tells you to size up your positions in the stocks that feel the most boring — the large, well-covered banks and established hydropower and insurance names that every financial commentator has already discussed a hundred times — and to size down your positions in the stocks that feel the most exciting: the smaller, newer, thinly covered names where a single positive rumour, a bonus announcement, or a good quarter can move the price sharply and where early buyers imagine outsized returns.
This is precisely backward from what most retail investors actually do, and understanding why requires being honest about the psychology at work.
Illiquidity and excitement are not independent of each other in a market like NEPSE — they are often the same underlying condition viewed from two different angles. A stock trades thinly, in part, because relatively few shares are available to the public (a concept the next chapter, Chapter 57, develops fully under the heading of free float) and because relatively few investors are paying attention to it day to day. That same scarcity — small supply, small audience — is exactly what makes the stock's price move sharply on a small amount of buying interest. A modest wave of retail attention landing on a small-cap hydropower counter can send it up 10-15 percent in a session (up against the daily circuit limit) in a way that the same wave of attention landing on a large, heavily traded bank stock simply cannot, because the bank stock has far more shares and far more daily turnover to absorb that buying without the price moving nearly as much.
Investors experience this pattern — small stock, big percentage move — as evidence of opportunity. It feels like discovery: "I found this before everyone else did, and look how fast it's moving." That feeling is a powerful, entirely genuine emotional pull toward putting a large amount of money into precisely the stocks whose thinness is what produced the exciting move in the first place. The conviction created by watching a small-cap stock run 40 percent in three weeks feels earned and specific, in a way that the steady, unglamorous performance of a well-covered bank stock never quite manages to feel.
But the same thinness that lets a small amount of buying move the price sharply upward is the thinness that will let a modest amount of selling — including your own selling, on the way out — move the price sharply downward. The mechanism that created the exciting rally is structurally the same mechanism that will punish an oversized exit. This is not a coincidence or a separate risk sitting alongside the opportunity; it is the same variable — thin liquidity — producing both effects. Retail investors routinely price in the upside of that thinness (fast gains) while entirely failing to price in its downside (a brutal, multi-week, self-defeating exit), because the upside happens first, feels good, and reinforces the decision to stay large, while the downside only becomes visible at the exact moment — a need to sell — when it is most costly to discover.
The instinct to bet bigger on the small-cap story that "feels" like the highest-conviction idea in your portfolio is, from a pure liquidity-risk standpoint, exactly the wrong instinct to act on without deliberate override. The ADV Rule exists specifically to interrupt this instinct with an explicit, calculated ceiling rather than leaving position size to a feeling of conviction that the stock's own illiquidity helped manufacture.
There is a related distortion worth naming directly: familiarity bias in reverse. Many retail investors treat large, well-known bank stocks as "boring" and therefore undersized in their portfolios, on the theory that everyone already owns them and there is no special edge in owning more. But sizing decisions should be driven by liquidity and risk capacity as much as by return conviction — a large-cap bank stock's very "boringness" (high liquidity, low headline risk, easy to trade around) is precisely what makes it a stock you can responsibly hold in larger size, giving your portfolio a liquid core that can be trimmed or added to quickly as circumstances change, while your smaller, higher-conviction small-cap positions stay sized appropriately small precisely because they are harder to unwind.
This does not mean small-cap and micro-cap NEPSE stocks are bad investments, or that they should never be held in meaningful size relative to a small portfolio. It means the size must be calibrated to the stock's own liquidity, not to how strongly the story has captured your imagination. A retail investor with total investable capital of NPR 20 lakh might reasonably hold NPR 3-4 lakh in a single illiquid small-cap hydropower name if that stock's ADV supports it and the investor has correctly sized down to respect the stock's thinness — that is a legitimate, disciplined bet. The problem this chapter addresses is not small-cap exposure itself; it is small-cap exposure sized as though the stock were as liquid as a large-cap bank, simply because the story feels equally — or more — compelling.
Lesson 56.6 — Building the ADV Check into the Pre-Trade Checklist
Chapter 53 introduced the pre-trade checklist — a short, disciplined sequence of questions an investor answers before any position is opened, designed to interrupt impulsive decision-making with a deliberate pause and a written record. The ADV Rule belongs in that checklist as a mandatory, non-negotiable step, not an optional add-on to consult only when a position "feels" large. The entire value of a checklist item like this comes from applying it every time, including — especially — the times when conviction is running high and the temptation is to skip straight to the buy order.
Here is how the ADV check should sit inside the broader pre-trade sequence, expanded from the checklist skeleton in Chapter 53:
Step one: Pull the stock's 20-day average daily traded value from your tracking spreadsheet or a market data source, using the most recent trailing window — not a figure from memory, and not a figure from a single recent headline-grabbing session.
Step two: Calculate the ADV Rule ceiling — 0.5 × ADV — as your maximum position size for this scrip under normal circumstances.
Step three: Compare your planned position size against that ceiling. If the planned position is within the ceiling, proceed to the remaining checklist items from Chapter 53 (valuation checks, thesis documentation, portfolio concentration limits, and so on). If the planned position exceeds the ceiling, stop and make an explicit decision rather than proceeding by default.
Step four, when the position exceeds the ceiling: choose one of three honest paths. Shrink the position to fit within the ADV Rule ceiling — usually the right default choice, and the one this chapter recommends as standard practice. Or, explicitly document an exception — writing down, in the same investment log referenced throughout this book, the specific reason the oversized position is justified (for instance, a deliberate long-term holding in a fundamentally strong small-cap name where the investor has consciously decided to accept a multi-week exit horizon in exchange for conviction in a multi-year thesis) and the extended days-to-liquidate figure the investor is knowingly accepting. Or, walk away from the position entirely, recognising that the size the thesis seems to warrant and the size the stock's liquidity can support are too far apart to reconcile responsibly.
What this step-four discipline prevents is the single most common failure mode this chapter has been building toward: the position that grows oversized not through one deliberate decision but through a series of small, unexamined ones — an initial purchase, a top-up after good news, another top-up after a friend's tip, each individually reasonable, none of them checked against the stock's actual liquidity, until the position has quietly become five, ten, twenty times larger than the stock's ADV can support, discovered only when the investor actually needs to sell.
The ADV check should also be applied retroactively, not only at entry. Because a stock's liquidity can change — often deteriorating quietly over months as retail attention rotates elsewhere, as discussed in Chapter 55 — a position that was appropriately sized on the day it was purchased can drift out of compliance with the ADV Rule without the investor ever making a new buying decision. A quarterly portfolio review (a practice this book recommends independent of the ADV Rule specifically) should include recalculating current ADV for every held position and rechecking each one against the 0.5 × ADV ceiling. A position that has grown oversized relative to its stock's shrinking liquidity is a signal worth acting on — trimming the position while the exit is still relatively easy is far preferable to discovering the mismatch during a forced sale.
Finally, it is worth connecting this checklist discipline back to the broader argument of Part XI. Chapter 54 established that liquidity is a first-order investment risk, deserving the same deliberate attention as valuation risk or business risk rather than being treated as an afterthought. Chapter 55 showed how exit risk specifically manifests in NEPSE — the mechanics of how a position becomes genuinely difficult to sell, and why that difficulty tends to arrive precisely when an investor's need to sell is most acute. This chapter has supplied the quantitative tool that turns those two chapters' warnings into an enforceable, repeatable rule: calculate ADV, apply the 0.5× ceiling, check every position against it before buying and again on a recurring basis afterward. A checklist item that lives only as an abstract principle gets skipped under pressure; a checklist item that is a single line with a single number to fill in gets followed.
Chapter recap
This chapter established Average Daily Volume, or more precisely Average Daily Value, as the foundational measurement for sizing any position on NEPSE responsibly. ADV is calculated by averaging a stock's daily rupee turnover across a trailing window — 20 trading days as the standard default, occasionally extended to 30 days for a smoother but slower-reacting figure — and it should always be pulled from actual daily turnover data rather than estimated from a single recent session, since individual days can be wildly unrepresentative of a stock's normal trading rhythm. This averaged, rolling figure is what allows an investor to distinguish a stock's durable, everyday liquidity from a one-off spike caused by a news event or a passing wave of attention.
From this measurement, the chapter derived the professional convention that connects liquidity to position size: rather than sizing a position off conviction, portfolio percentage, or rupee comfort alone, professional risk management ties position size to how many trading days it would take to exit that position without materially moving the price, assuming a conservative daily participation rate against the stock's own ADV. Institutional practice typically caps daily participation at 10-25 percent of ADV and targets an exit horizon of roughly 3-10 trading days; this chapter adapted that convention for the Nepali individual investor into a specific, memorable formula — the ADV Rule — setting maximum position size at roughly half of a stock's 20-day average daily traded value, derived from a 5-day exit horizon at a conservative 10 percent daily participation rate. This adaptation deliberately tightens the institutional norm to reflect cruder retail execution, NEPSE's generally thinner market-wide liquidity, and the less forgiving, less predictable liquidity needs of an individual investor compared to a fund manager.
The worked examples made the chapter's central claim concrete: an identical rupee position — NPR 15 lakh in both cases — represented a liquidity non-event in a large-cap bank stock with deep daily turnover (an exit achievable in well under a single trading session) and a serious, multi-week liquidity trap in a thinly traded small-cap hydropower or manufacturing counter (an exit requiring twelve or more trading days of careful, patient selling under favourable conditions, and potentially far longer under stressed ones). The extended comparison table demonstrated that this relationship is not linear — days-to-liquidate compounds sharply as ADV shrinks, meaning a fixed rupee position-sizing rule of the kind many retail investors use by default ("never put more than X lakh in one stock") provides no real protection at all, because it treats radically different liquidity conditions as though they were the same risk.
The chapter then confronted the psychological pattern that makes this rule difficult to follow in practice: thin liquidity and market excitement in NEPSE are frequently the same underlying condition viewed from two angles, since a scarce, thinly held stock is exactly the kind of stock that moves sharply on modest buying interest — which retail investors experience as validating evidence of a good idea, encouraging larger position sizes precisely where the ADV Rule demands smaller ones. The mechanism that produces the exciting rally on the way in is structurally identical to the mechanism that will punish an oversized exit on the way out. Recognising this pattern is what allows an investor to consciously override the instinct to bet bigger on the stock that feels most like a discovery, and instead let a liquid, well-covered large-cap serve as the portfolio's core position-sizing anchor while smaller, thinner names are sized down to match their own reduced capacity to absorb an exit.
Finally, the chapter converted this principle into an operational habit by embedding the ADV check directly into the pre-trade checklist introduced in Chapter 53: calculate 20-day ADV, compute the 0.5× ceiling, compare it against the planned position, and — when the planned position exceeds the ceiling — make an explicit, documented choice to shrink the position, consciously accept a longer exit horizon with the reasoning written down, or walk away. Because ADV itself drifts over time as a stock's trading attention rises and falls, this check belongs not only at entry but as a recurring item in periodic portfolio review, catching positions that have quietly grown oversized relative to a shrinking underlying liquidity pool even when the investor made no new buying decision at all.
The next chapter, Chapter 57, "Free Float-Based Allocation Limits," extends this liquidity-engineering framework by examining a variable that sits upstream of ADV and helps explain why it varies so much from scrip to scrip in the first place: free float, the portion of a company's total shares that is actually available for public trading rather than locked up in promoter holdings, government stakes, or other long-term, non-trading blocks. Where this chapter built a rule around how much of a stock trades on an average day, Chapter 57 builds a complementary rule around how much of a stock's total capital structure is even eligible to trade at all — and shows how a narrow free float can quietly cap a position's liquidity ceiling even in a company whose total market capitalisation looks large enough to seem perfectly safe.