UK Serial Acquirers: Only 2 of 11 Earn Above Cost of Capital
[Part of our Global Serial Acquirer Scorecard]
Key Finding: Only 2 of 11 UK serial acquirers earn above a 12% cost of equity. Zero companies breach 40% GW/TA — the most disciplined balance sheets of any market we screen. Yet 82% still earn below cost of capital. Four UK acquirers collapsed from 15%+ ROIC to below 10%. Goodwill discipline is necessary but not sufficient.
We screened 11 UK serial acquirers for return on invested capital. Two earn above 12%. Two more sit borderline at 10-12%. Seven earn below 10%.
The UK serial acquirer universe has a distinction no other market shares: zero companies with GW/TA above 40%. In Sweden, 9 of 24 companies breached that threshold. In Canada, CGI operates at 60%. UK acquirers maintained price discipline longer than their peers — and four of them still collapsed. The goodwill cliff is real, but avoiding it doesn’t guarantee returns.
The Scorecard
| # | Company | Ticker | ROIC | GW/TA | (GW+Int)/TA | Op Margin | Drawdown | Tier | Verdict |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Grafton Group | GFTU | 14.9% | 20% | 29% | 12.2% | -17.5% | A | Spike from 4.9%. Verify sustainability. |
| 2 | Diploma | DPLM | 12.8% | 31% | 58% | 18.7% | -24.1% | A | Recovering from dip. Best positioned. |
| 3 | Halma | HLMA | 11.3% | 39% | 56% | 18.2% | -20.5% | B | Declined from 19%. Now borderline. |
| 4 | Smiths Group | SMIN | 10.3% | 25% | 32% | 18.7% | -20.3% | B | Volatile. Divestiture-inflated history. |
| 5 | Spirax Group | SPX | 8.5% | 25% | 37% | 18.3% | -31.2% | C | Crashed from 22%. Acquisition hangover. |
| 6 | Bunzl | BNZL | 8.2% | 24% | 39% | 7.0% | -42.2% | C | Structural decline. Scale problem. |
| 7 | Judges Scientific | JDG | 6.8% | 29% | 49% | 12.9% | -50.2% | C | Crashed from 24%. Something broke. |
| 8 | SDI Group | SDI | 5.8% | 33% | 53% | 10.5% | -35.0% | C | Declining from 19%. Mini-JDG. |
| 9 | DCC | DCC | 3.8% | 19% | 52% | 2.6% | -20.4% | D | Energy distribution. Margins too thin. |
| 10 | Restore | RST | 2.7% | 31% | 51% | 11.8% | -18.3% | D | Never earned CoC consistently. |
| 11 | Brickability | BRCK | 2.3% | 28% | 49% | 4.8% | -27.9% | D | Collapsed from 13.6%. |
Tier A (ROIC > 12%): 2 companies (18%). Tier B (ROIC 10-12%): 2 companies (18%). Tier C (ROIC 5-10%): 4 companies (36%). Tier D (ROIC < 5%): 3 companies (27%).
82% earn below a 12% cost of equity. We excluded Spectris (SXS) — it had 13.5% ROIC with 42.5% GW/TA before delisting during the screening period. Had it remained listed, it would have been the only UK serial acquirer with GW/TA above 40%.
The GW/TA Discipline — And Its Limits
No UK serial acquirer has GW/TA above 40%. The highest is Halma at 39%. In every other major market, at least one company has breached that line. This is genuine balance sheet discipline.
But GW/TA tells only half the story. The combined (GW+Intangibles)/TA ratio reveals that UK acquirers buy intangible-heavy targets. Under IFRS 3, customer relationships and technology get classified as identifiable intangible assets — not goodwill. Several UK companies with modest GW/TA carry heavy combined ratios:
| Company | GW/TA | (GW+Int)/TA | ROIC | The hidden load |
|---|---|---|---|---|
| DPLM | 31% | 58% | 12.8% | +27 points of hidden intangibles |
| HLMA | 39% | 56% | 11.3% | Already past the combined cliff |
| SDI | 33% | 53% | 5.8% | GW/TA looks moderate; it’s not |
| DCC | 19% | 52% | 3.8% | 19% GW/TA masks 52% combined |
| RST | 31% | 51% | 2.7% | Same pattern |
| JDG | 29% | 49% | 6.8% | Near the combined cliff |
| BRCK | 28% | 49% | 4.8% | Near the combined cliff |
Seven of eleven companies carry combined (GW+Int)/TA above 49%. The GW/TA discipline is real at the headline level. The intangible load underneath is not disciplined at all.
What Works: Grafton and Diploma
Grafton Group (GFTU) — 14.9% ROIC, 20% GW/TA, 29% (GW+Int)/TA, 12.2% operating margins. Down 17.5%. The lowest goodwill intensity among Tier A UK names. But the benchmark carries a caveat: Grafton’s ROIC spiked from 4.9% to 14.9%. If the spike holds, Grafton is the cleanest balance sheet compounder in the UK. If it reverts, this is a Tier C name masquerading as Tier A.
Diploma (DPLM) — 12.8% ROIC, 31% GW/TA, 58% (GW+Int)/TA, 18.7% operating margins. Down 24.1%. Diploma is recovering from a ROIC dip and is the best-positioned UK serial acquirer. Essential industrial products across life sciences, seals, and controls. The 58% combined intangible ratio is high, but 18.7% margins provide the buffer to service that intangible base. Discipline over pace — Diploma has historically been selective about deal size and pricing.
Halma’s Decline
Halma (HLMA) was the UK’s gold standard serial acquirer. It no longer earns above cost of capital.
| Period | ROIC | GW/TA |
|---|---|---|
| 5 years ago | 19% | ~27% |
| 3 years ago | 14% | ~33% |
| Current | 11.3% | 39% |
ROIC has fallen from 19% to 11.3% as GW/TA climbed from ~27% to 39%. Halma is one acquisition away from crossing the 40% line. Operating margins of 18.2% remain strong — the safety, environmental, and healthcare niches still have pricing power. But the ROIC trend is unambiguously down. If the next major deal pushes GW/TA past 40%, the math tightens. Halma sits at 56% (GW+Int)/TA, already past the combined cliff.
Smiths Group (SMIN) — 10.3% ROIC, 25% GW/TA, 32% (GW+Int)/TA, 18.7% operating margins. Down 20.3%. Volatile ROIC history inflated by divestitures. The 18.7% margins match Diploma’s, but Smiths lacks the consistent compounding trajectory. Borderline today with an unclear direction.
What Fails: The Collapse Wave
The UK’s defining pattern is not the goodwill cliff — it’s the collapse wave. Four companies fell from 15%+ ROIC to below 10%. Four collapses from 15%+ in an 11-company universe is the UK’s defining pattern.
| Company | Peak ROIC | Current ROIC | Cause |
|---|---|---|---|
| JDG | 24% | 6.8% | Geotek acquisition doubled goodwill base |
| SPX | 22% | 8.5% | Chromalox acquisition, strategy shift |
| SDI | 19% | 5.8% | Same niche as JDG, same ROIC decay |
| BRCK | 13.6% | 2.3% | Construction cycle + acquisition hangover |
Judges Scientific (JDG) — From 24% ROIC to 6.8%. The Geotek acquisition doubled the goodwill base and overwhelmed the returns of the legacy scientific instruments portfolio. At 29% GW/TA and 49% (GW+Int)/TA, the balance sheet tells the story. Operating margins of 12.9% are adequate but insufficient to service the expanded intangible load. Down 50.2%.
Spirax Group (SPX) — From 22% ROIC to 8.5%. The Chromalox acquisition shifted strategy and diluted returns. At 25% GW/TA, 37% (GW+Int)/TA, and 18.3% operating margins, Spirax has the margin profile to recover — if integration delivers. Down 31.2%.
SDI Group (SDI) — From 19% to 5.8%. Operates in the same scientific instruments niche as Judges. Same ROIC decay pattern. 33% GW/TA, 53% (GW+Int)/TA, 10.5% operating margins. Down 35.0%. A smaller version of the JDG story.
Brickability (BRCK) — From 13.6% to 2.3%. Construction cycle bust plus acquisition hangover. 28% GW/TA, 49% (GW+Int)/TA, 4.8% operating margins. Down 27.9%.
The Rest
Bunzl (BNZL) — 8.2% ROIC, 24% GW/TA, 39% (GW+Int)/TA, 7.0% operating margins, down 42.2%. Distribution business with structural margin decline. The -42.2% drawdown is the second-worst in the group for a Tier C name. Scale is a headwind, not an advantage.
DCC (DCC) — 3.8% ROIC, 19% GW/TA, 52% (GW+Int)/TA, 2.6% operating margins. Energy distribution. Margins too thin for any acquisition model. Down 20.4%.
Restore (RST) — 2.7% ROIC, 31% GW/TA, 51% (GW+Int)/TA, 11.8% operating margins. Never earned cost of capital consistently despite adequate margins. Down 18.3%.
The Standout: Diploma
Diploma at 12.8% ROIC with 18.7% operating margins is the best-positioned UK serial acquirer. It shares its margin profile with Halma (18.2%) and Smiths (18.7%), but Diploma is the only one of the three recovering — ROIC is improving, not declining.
The 31% GW/TA is moderate, though the 58% (GW+Int)/TA reveals a heavier intangible load from acquiring specialized industrial products businesses. The difference between Diploma and the four collapsed names is deal selectivity: Diploma has historically avoided the transformative acquisitions that destroyed ROIC at Judges (Geotek) and Spirax (Chromalox). Small, bolt-on deals in essential industrial niches compound better than big bets.
Down 24.1% in a market that has punished the entire UK serial acquirer group. At this drawdown, Diploma offers recovery-stage entry into the only improving compounder in the UK universe.
The Cautionary Tale: Judges Scientific
Judges Scientific went from 24% ROIC to 6.8% because of one acquisition. The Geotek deal doubled the goodwill base, transforming a small, disciplined scientific instruments acquirer into a goodwill-heavy company earning below cost of capital. At 29% GW/TA and 49% (GW+Int)/TA, the balance sheet carries the weight of that single decision. Down 50.2% — the worst drawdown in the UK group.
The lesson applies across markets: serial acquirers that stay small and selective (like Sweden’s OEM International at 26.4% ROIC and 8% GW/TA) outperform those that make transformative deals. Judges had a working model — small scientific instruments acquisitions generating 24% ROIC. Geotek broke it. The size of the deal relative to the existing capital base is the risk that GW/TA doesn’t capture until it’s too late.
Cross-Market Context
The UK shares its GW/TA discipline with the Netherlands — both markets show lower average goodwill intensity than Sweden or the US. But lower GW/TA doesn’t translate to higher ROIC.
| Metric | UK (11) | Sweden (24) |
|---|---|---|
| Above 12% ROIC | 2 (18%) | 6 (25%) |
| Above 10% ROIC | 4 (36%) | 8 (33%) |
| Average GW/TA | 28% | 34% |
| Worst drawdown | -50.2% (JDG) | -61.8% (VIT-B) |
UK acquirers maintained price discipline longer but the simultaneous ROIC breakdown across Halma, Judges, Spirax, and SDI suggests the competitive environment for UK targets has tightened. These were not overpayers — they were disciplined acquirers who hit returns compression from target market saturation.
Compare to Sweden, where the failures are more clearly explained by acquisition pricing (Vitec at 3-4x revenue, Storskogen competing on deal flow). UK failures are subtler: good operators with moderate goodwill who ran out of targets that generate adequate returns at any reasonable price.
Where the Market Is Wrong
Diploma (DPLM, -24.1%) — 12.8% ROIC, 18.7% operating margins, improving trajectory. The only UK compounder above cost of capital with a positive ROIC trend. At this drawdown, you’re buying the best-positioned name in the group at a discount.
Bunzl (BNZL, -42.2%) — 8.2% ROIC, below cost of capital, but a 42% drawdown for a stable distribution business with 24% GW/TA seems excessive. If ROIC stabilizes at 8-9%, the drawdown reprices.
Spirax (SPX, -31.2%) — 8.5% ROIC, crashed from 22%. If the Chromalox integration delivers operating margin improvement, recovery to 10%+ ROIC is achievable on 18.3% margins. Down 31.2% for a business with strong engineering moats.
What to Look For in UK Serial Acquirers
Four filters for this market:
- Operating margins above 15%. The UK’s surviving compounders (Diploma, Halma, Smiths, Spirax) all have 18%+ margins. Below that threshold, UK acquirers consistently fail — Bunzl (7.0%), DCC (2.6%), and Brickability (4.8%) prove it.
- Avoid transformative deals. Judges, Spirax, and SDI all collapsed after single large acquisitions. Bolt-on deals at 2-5% of capital base compound; transformative deals at 30%+ destroy.
- Watch (GW+Int)/TA, not just GW/TA. UK acquirers look disciplined on GW/TA (all below 40%). The combined ratio tells a different story — 7 of 11 are above 49%.
- ROIC trend over level. Diploma (improving) matters more than Halma (declining at a higher level). The collapse wave proves that today’s 11% can be tomorrow’s 6%.
Methodology
We screened 11 UK serial acquirers listed on the London Stock Exchange (LSE). All financial data in GBP.
ROIC = NOPAT / Invested Capital (equity + debt - cash). Sourced from QuickFS (latest fiscal year). ROIC includes goodwill in the denominator.
GW/TA = Goodwill / Total Assets. (GW+Int)/TA = (Goodwill + Intangible Assets) / Total Assets.
Drawdown = Maximum decline from peak. Sourced from Yahoo Finance.
Tier classification: A (>12%), B (10-12%), C (5-10%), D (<5%).
Exclusions: We excluded Spectris (SXS), which delisted during the screening period. It had 13.5% ROIC with 42.5% GW/TA before delisting. Grafton Group’s ROIC spike from 4.9% to 14.9% requires sustainability verification.
All data as of February 2026.