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Actionable insights — Buying This Amazing Compounder (3i Group)

Not which holding company to buy, but how a results-day fall is converted into an entry: pre-work the name, isolate the line that actually deteriorated, check the discount against its own twenty-year range, and let a limit order do the rest.
2026-MAY-17 · Compounding Quality (Substack) · Pieter Slegers / Team Compounding Quality · read ↗ · full analysis · transcript
How to read this page: a purchase post, so the reusable material is entry discipline rather than screening. The distinguishing feature is that the work was already done — this name had appeared in four earlier issues before the price event arrived. Written post, so no timestamps.

1. Do the work before the price event, so the decision is a trigger and not a analysis

The repeatable method
  1. Maintain a shortlist of names already researched, valued and rated, with the entry condition written down.
  2. Keep re-publishing or re-reviewing them at intervals so the valuation stays current, not stale.
  3. When a price event arrives, spend the day checking whether the thesis broke — not building the thesis.
  4. Buy within days of the event, before the analysis window closes.
Here: III.L appeared four times before the purchase — priced at a small NAV discount on 21 April, named a buy candidate on 28 April, ranked Best Buy #2 on 3 May, added to the rated list on 7 May at a modelled 49.5% undervaluation. The results-day fall came on Thursday 14 May; the purchase was announced on Sunday for Monday. Ten days from rating to fill.
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2. On a results-day drop, isolate the single line that deteriorated and size it

The repeatable method
  1. List what actually changed in the release, separating the metrics that improved from the ones that missed.
  2. Quantify the miss precisely rather than accepting the headline narrative.
  3. Ask whether the deteriorating line is structural (the moat) or cyclical/comparative (the base effect, one geography, one quarter).
  4. Weigh the size of the price move against the size of the actual change. A 14% fall on one slowing metric while profits rise is the arithmetic that creates the opportunity.
  5. Then decide: buy the overreaction, or accept that the market saw something you did not.
Here: what improved — net income £5,294m against £5,038m (+5.1%) and EPS +3.3%. What missed — Action's like-for-like sales growth at 2.4% against 6.8%, "mainly in France and Germany". The price response: down 14% in a day. Management's own framing is included rather than ignored: some inflation from the Middle East, but "comparables should get easier in the second half."
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3. Judge a holding company's discount against its own twenty-year range, not against zero

The repeatable method
  1. Compute the current discount of share price to stated net asset value.
  2. Plot it against the company's own history over as long a period as you can get — the useful signal is the percentile, not the level.
  3. Separately, satisfy yourself the NAV mark is credible: how are the unquoted assets valued, and when were they last marked?
  4. Recognise you are underwriting two things — the growth of the assets, and the closing of the gap — and that only the first is under management's control.
Here: "Over the past 20 years, the company has never traded at such a large discount as today" — a discount of "almost 30%" to NAV, at a 2,223p price with the shares down 30.0% year to date. The underlying compounding is given the same long-run treatment: NAV from 279p to 3,030p since 2012.
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4. Read a newly announced buyback as management's own valuation opinion, and size it

The repeatable method
  1. Note whether the buyback is new and opportunistic, or a standing programme that runs regardless of price. Only the first carries information.
  2. Express the authorisation as a percentage of market capitalisation so you can judge whether it is a signal or a gesture.
  3. Check it against management's own stated valuation — a company buying back below its published NAV is making an explicit claim.
  4. Use it as corroboration for a thesis you already hold, never as the thesis itself.
Here: "Management seems to think the stock is too cheap right now as they announced a share repurchase program of up to £750 million" — roughly 3% of the £22.8bn market cap, announced on the same results as the disappointing Action figure. For a holding company trading below NAV, every share bought back is accretive to the remaining holders by construction.
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5. Use a limit slightly above the market — a working limit, not a lowball bid

The repeatable method
  1. Decide the position size in currency first, then convert to a share count.
  2. Set the limit a small distance above the prevailing price — enough to fill through normal intraday movement, tight enough to protect against a gap.
  3. Publish the exact quantity and limit so the execution can be checked afterwards.
  4. Do not chase if it does not fill; the pre-work established the price at which the idea works.
Here: "We are buying 3i Group for $50.000. This means we enter an order in the market for Q 1.700 with a limit price of 2,300 pence." The limit is roughly 3.5% above the 2,223p quoted price — designed to fill on Monday's open rather than to bargain. The same pattern recurs across the archive: 31 May sets 42.5 GBP, 4 AUD and 102 CAD limits the same way.
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6. When one asset dominates a holding company, track that asset's operating metric directly

The repeatable method
  1. Identify what share of NAV the largest holding represents, and stop treating the vehicle as diversified above roughly half.
  2. Find the single operating metric that drives that asset — same-store sales, occupancy, subscriber growth — and monitor it quarterly.
  3. Accept that your thesis is really about that metric, and write it down that way.
  4. Set in advance what level of deterioration in it would break the case.
Here: "This growth is mainly driven by its non-food retail chain", which grew sales from €718m to €16,000m since 2011, about 25% a year. And the whole 14% drawdown came from that one chain's like-for-like number falling to 2.4%. The holding company's twenty-year NAV compounding and its one-day price collapse have the same underlying cause.
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Methods distilled from the archived Compounding Quality post for personal study. Not investment advice.