Diploma scores 31/100 (Below expectations) on SINK's independent climate assessment — scored from public data only, no company payment can change a number. Last verified September 2026.
That places Diploma joint 564th of 809 companies scored, and joint 7th of 10 in Industrial Equipment / Machinery.
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.
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Same ten questions for every company. No private weighting.
SINK = (0.3 × Base + 0.7 × Performance) × ScaleStrongest on Controversies & Red Flags and Carbon Footprint — Operations (8/10, 6/10). Weakest on Targets & Commitments and Water Impact (3/10, 3/10).
6 sources used in this assessment. All publicly available. Each row shows which rubric questions it informed.
Provisional evidence. Published on 7 sources and 3 independent parties — below our full-confidence threshold of 8 sources and 3 independent parties. Every source shown below passed the same quality checks as any other score: all live, none from data aggregators. There is simply less of it.
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.
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.
As Diploma's score updates, the trajectory will appear here.
This score is not currently being contested.
Every challenge is published. We'd rather be corrected than wrong — that's the whole point.
No challenges submitted yet. If you have evidence that contradicts this score, you can challenge any question above — cite a public source and we'll review it.
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.
Peer distributor of industrial and specialist products across North America and Europe.
View breakdown →Logistics and supply chain operator with comparable warehouse, vehicle, and office footprint.
View breakdown →Mid-cap industrial services and inspection company with similar revenue scale and supply chain exposure.
View breakdown →UK-listed industrial safety and sensors business with comparable acquisition-led growth model.
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