Diploma is a UK-listed specialty distributor of technical products including seals, cables, wiring, and life science equipment across Europe and North America.
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Limited evidence. Published on 7 sources, below our full-confidence threshold of 8. Every source cited on this page passed the same quality checks as any other score: all live, none from data aggregators. There is simply less of it.
Diploma discloses Scope 1 and 2 emissions under mandatory UK listing rules but relies on intensity metrics rather than absolute reductions, masking revenue growth from acquisitions. Scope 3 data is stale (FY22, cost-based). No SBTi targets, no third-party verification, no renewable energy percentage disclosed. Clean controversies record.
Diploma scores 31/100 (Below expectations) on SINK's independent climate assessment, scored from public data only. Fees pay for the review, never the result. Last verified September 2026.
That places Diploma joint 588th of 847 companies scored, and joint 7th of 10 in Industrial Equipment / Machinery.
Where Diploma sits among industrial equipment / machinery peers.
Among the 10 major industrial equipment / machinery brands we've scored, Diploma is tied =7th of 10, with 2 others.
Its three lowest-scoring questions, and what the evidence didn't show.
No TNFD disclosure, biodiversity policy, or deforestation commitment found.
No water consumption, stewardship programme, discharge data, or reduction targets disclosed.
No SBTi validated or committed targets confirmed.
A score changes when the evidence does. We use new published evidence at the next rescore. Evidence that isn't public can count through an evidence review.
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Get in touch →Strongest on Controversies & Red Flags and Carbon Footprint — Operations (8/10, 6/10). Weakest on Nature & Biodiversity Impact and Water Impact (3/10, 3/10).
The 3 companies in the sector scoring nearest above Diploma.
Spirax exceeds near-term emissions targets and holds third-party verified data across Scope 1+2, but Scope 3 supply chain reduction remains unproven.
See the breakdown →Xylem publishes comprehensive carbon and water data with SBTi-validated 2030 targets, but Scope 3 emissions rose 9% year-on-year while relying on economic intensity rather than absolute reduction.
See the breakdown →The formula and all 6 sources.
Same ten questions for every company. No private weighting.
SINK = (0.3 × Base + 0.7 × Performance) × Scale6 sources used in this assessment. All publicly available. Each row shows which of the ten questions it informed.
This company's public sustainability disclosure is limited. This score is based on the 6 verified sources cited below, rather than padded to a standard count.
This score is published on seven verified sources rather than the eight we require for full confidence. All seven are live and none comes from a data aggregator — there is simply less independent coverage of Diploma's environmental performance than of a larger listed company. One further source that genuinely evidences one of the ten questions would move this to full confidence. The score itself is unaffected by the count.
Limited data coverage. This assessment is based on 6 sources, 50% of which are self-reported by the company. Scores may change as independent evidence becomes available.
“5.7 Emissions intensity (Scope 1 & 2 tCO2e/£1m) FY23: 7.6”
“38% reduction of Scope 1 and 2 emissions”
“Category 1: Purchased Goods and Services accounts for 51% of Scope 3 emissions”
“58% of almost 300 companies from the Forbes 2,000 found to be at risk of 'net zero greenwash'”
“The SBTi's Target Dashboard lists companies and financial institutions that have set science-based targets, or have committed to developing targets”
If you believe a source has been misread or a newer version exists, submit a challenge.
Diploma is a UK-listed specialty distributor of technical products including seals, cables, wiring, and life science equipment across Europe and North America. Mid-cap industrial business with 1,500+ employees, £1.5bn FY2025 revenue, grown primarily through acquisition. Low direct environmental footprint; supply chain exposure through procurement.
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