Rebalancing a Windmill Capital smallcase: Everything You Need to Know
Every quarter, Windmill Capital sends out rebalance updates across its smallcases. Some investors apply them immediately. Others let the notification sit. A few skip it entirely and wonder later why their portfolio drifted.
This article explains what a rebalance is, what we do when we run one, and answers the questions we hear most often.
What is a smallcase, and Why Does It Need Rebalancing?
A smallcase is a basket of stocks or ETFs built around a specific investment idea — a theme like India’s defence sector build-up, a strategy like selecting stocks with high price momentum, or a factor like dividend yield. When you invest in a smallcase, you are buying into that idea, not just the individual stocks.
Over time, markets move. A stock that qualified for a momentum strategy three months ago may no longer rank in the top 25% on that metric. A company that fit the theme of domestic manufacturing may shift its business toward exports. The basket, if left unchanged, starts to drift from the original investment idea that justified buying it in the first place. That drift is what rebalancing corrects.
Think of a cricket team with strict selection criteria — only batters who average over 40 in the last six months. As form changes each season, the squad changes too. The criteria stay fixed; the players who meet them do not. A smallcase rebalance works the same way. The strategy stays constant; the stocks that best represent it get refreshed.
Most Windmill Capital smallcases are rebalanced quarterly. Some, built around shorter-term factors, are reviewed more frequently. The frequency is set at launch based on how quickly the underlying strategy factors change.
What Does Windmill Capital Actually Do During a Rebalance?
Before every rebalance, our team runs each smallcase through a two-stage process — the same framework used when the portfolio was first constructed.
- Quantitative filters
Proprietary filters are applied across the full universe of eligible stocks to eliminate those that fail to meet specific thresholds. These filters vary by smallcase but typically cover metrics like earnings per share growth, promoter pledging levels, liquidity, and valuation. This stage is deliberately mechanical — it keeps personal bias out of the initial screen.
- Qualitative deep – dive
The shortlist that survives the quantitative filter is then examined individually. The team goes through annual reports, management commentary, industry and sectoral developments, and broker research reports. A company with acceptable metrics but deteriorating management credibility, for example, would be flagged at this stage.
The output of this combined exercise determines three things:
If the review concludes that the existing portfolio already represents the strategy well, no changes are pushed. A rebalance with zero changes is not a failure; it means the portfolio is where it needs to be.
What Happens to Your Investment When a Rebalance Is Applied?
When you apply a rebalance update, three things happen mechanically. Stocks being removed are sold first. The proceeds from these sales are used to fund the purchase of new stocks. If the new purchases cost more than the sales generated, the additional amount is drawn from your broker account. If the sales exceed the purchase cost, the surplus is credited back.
Your Money Put In — the total amount you have invested in the smallcase — changes depending on whether net new money flowed in or out. If the buys exceed the sells, Money Put In increases. If the opposite, it decreases.
Your Realised Returns are updated to reflect any profit or loss booked on the stocks that were sold. If a removed stock was sold above your average buying price, you book a gain. If sold below, you book a loss.
One thing to note: because Money Put In can increase after a rebalance, the percentage return on the overall smallcase may look lower immediately after — even if the absolute profit is unchanged. This is normal arithmetic. More capital in the denominator, same numerator, lower percentage. The absolute P&L has not shrunk.
Questions Clients Ask
These are the questions that arrive in our inbox every rebalance season. The answers are worth reading once carefully — they clarify a few things that are easy to misread.
Why are rebalance updates not applied automatically?
The answer lies in regulation, not technology. Windmill Capital is a SEBI-registered Research Analyst. Under this registration, we can make changes to the model portfolio and communicate the same to investors — but we cannot directly execute those transactions in client accounts or hold client funds. That authority belongs to collective investment structures like Mutual Funds and Portfolio Management Services, where the manager is legally empowered to trade on your behalf.
Because your smallcase sits in your own demat account, and because the investor-as-decision-maker is a cornerstone of how the smallcase model works, rebalance updates require your active approval. You receive a notification, review the proposed changes, and apply them with two taps. You remain in control at every step.
What happens if you skip a rebalance?
Skipping a rebalance is not catastrophic, but it has a compounding cost that most investors underestimate. Suppose a smallcase is built on a momentum strategy — it holds stocks in the top quartile of 3-month price performance. When a rebalance arrives, some stocks from that top quartile have slipped out. Others, newer movers, have entered it. If you skip the update, your portfolio continues to hold the old cohort — stocks that no longer fit the selection criteria — while missing the stocks that currently do. The portfolio is still invested in equities, but it is no longer invested in the strategy you originally bought.
Over a single missed rebalance, the drift may be small. Over two or three missed updates, the portfolio can diverge meaningfully. There is one safety net: if you miss one rebalance but apply the next one, your portfolio is brought in line with the most recent model output. Think of it like skipping a phone software update — the next update patches everything forward. But the intermediate period of drift is not recovered.
Why wasn’t the smallcase rebalanced when prices were falling?
Rebalancing is not a response to price movements. It is a response to whether portfolio constituents continue to satisfy the strategy’s selection criteria. If markets fall 15% in a month, that fall does not automatically mean any individual stock has stopped fitting the strategy. A quality stock with strong earnings and low debt is still a quality stock even if its price is temporarily lower. The price alone is not a signal to act.
That said, there are genuine exceptions. Windmill Capital has conducted ad-hoc, unscheduled rebalances when a constituent faced a material, strategy-breaking development. When Delta Corp received an exorbitant GST demand notice, it was removed from the relevant smallcase before the scheduled rebalance window. When RBI imposed restrictions on Paytm’s core payment business, similar action followed. These were situations where the investment thesis for holding those stocks had fundamentally changed. Temporary price weakness is not that situation.
Why was I advised to exit a stock that was still rising?
The model does not optimise for price. It optimises for strategy fit. Take a momentum strategy that selects stocks in the top 25% of 3-month returns. A stock added six months ago because it ranked in that top quartile may, by the next review, have risen so much that its recent 3-month return no longer ranks in the top 25% — other stocks have moved faster. The model will remove it, even if it is trading at a higher price than when it was added.
Selecting stocks based on price direction — keeping winners because they are rising, avoiding losers because they are falling — is exactly the kind of emotional reasoning that systematic investing is designed to prevent. The rebalance keeps the strategy honest.
Why has rebalancing not improved performance?
Rebalancing is a portfolio maintenance process, not a performance accelerant. When market conditions are difficult — a broad sell-off, a sector-wide correction, a macroeconomic headwind — a rebalance cannot neutralise that external pressure. What it does is ensure that the portfolio holds the right stocks for the strategy, so that when conditions improve, the portfolio is positioned to benefit.
Windmill Capital’s model portfolios are built on strategies that have been back-tested and analysed across multiple market cycles. The portfolio allocation — the strategy’s fundamental logic — is not adjusted in response to recent underperformance. If it were, the strategy would be chasing its own tail, abandoning a thesis just as it might be approaching recovery. A well-constructed strategy, consistently applied, generates results over the long term. Short-term underperformance is information, but it is not automatically a signal to change the strategy.
I am a paid subscriber. Why isn’t my smallcase rebalanced more frequently?
A subscription fee covers access to the smallcase and the analysis behind it. It does not change the underlying rebalancing frequency, which is determined by the strategy’s investment horizon at launch. A smallcase built on long-term quality factors — like consistent earnings growth over five years — does not improve by being reviewed weekly. The inputs change slowly by design. Rebalancing it more often would generate additional transaction costs (brokerage, STT, potential capital gains) without improving strategy alignment.
For short-term strategies, rebalancing does happen more frequently. For long-term strategies, it happens less often. Unnecessary rebalancing adds cost; it does not add value.
How to Customise your smallcase Rebalance
While the rebalance update reflects the model’s recommendations, investors are not obligated to apply every change exactly as suggested. The smallcase platform allows you to review individual stock additions and removals before confirming, and you can choose to exclude specific stocks from the update if you have a personal reason for holding or avoiding a particular company.
Watch the following video for a step-by-step guide on how to review, customise, and apply a rebalance update.
A few practical points to keep in mind. If you exclude a stock that the model is adding, your portfolio will be slightly out of sync with the strategy from that point. If you retain a stock that the model is removing, the same applies. These are valid personal choices, but they mean your returns and composition will diverge from the model smallcase’s tracked performance. The larger the number of customisations, the larger the potential divergence.
Disclaimer: Investment in securities market are subject to market risks. Read all the related documents carefully before investing. Registration granted by SEBI, membership of a SEBI recognized supervisory body (if any) and certification from NISM in no way guarantee performance of the intermediary or provide any assurance of returns to investors.
The content in these posts/articles is for informational and educational purposes only and should not be construed as professional financial advice and nor to be construed as an offer to buy /sell or the solicitation of an offer to buy/sell any security or financial products.Users must make their own investment decisions based on their specific investment objective and financial position and using such independent advisors as they believe necessary.
Windmill Capital Team: Windmill Capital Private Limited is a SEBI registered research analyst (Regn. No. INH200007645) based in Bengaluru at No 51 Le Parc Richmonde, Richmond Road, Shanthala Nagar, Bangalore, Karnataka – 560025 creating Thematic & Quantamental curated stock/ETF portfolios. Data analysis is the heart and soul behind our portfolio construction & with 50+ offerings, we have something for everyone. CIN of the company is U74999KA2020PTC132398. For more information and disclosures, visit our disclosures page here.
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