Direct emissions
3,732
tCO2e
D
Diploma PLC (Group Parent)
Explore carbon emissions data for Diploma PLC (Group Parent). Mycelium helps you review reported emissions, disclosure status, Scope 1, Scope 2 and Scope 3 data, climate targets and sustainability information in one company profile.
This profile brings together available carbon emissions data for Diploma PLC (Group Parent), including reported figures, modelled estimates, disclosure documents and sustainability indicators, so you can review its emissions and compare its performance against similar companies. Read how we source and check this data.
Emissions
Carbon emissions
Total yearly emissions across all scopes
398,508 tCO2e (Market Based)
Scope 1
tCO2e
3,732
Scope 2 (Market Based)
tCO2e
1,043
Scope 3 total
tCO2e
393,733
Scope 3 reported
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
Provenance
Emissions
Factors
261,248
kgCO2e / £M
Supplier specific emission factors (kgCO2e / £M)
Modelled
Reported
Scope 1 + 2
Direct + purchased energy
3,130
3,130
Upstream
+ upstream Scope 3
170,584
164,996
Total
+ all Scope 3
261,248
180,043
Which figure should I use?
Use Modelled. It is the most complete view: any categories the company hasn't disclosed are filled with industry-typical estimates, so a transparent company isn't unfairly penalised against one that simply hasn't reported.
Reported counts only emissions the company has filed itself. A blank or low Reported cell doesn't mean those emissions don't exist, just that the company hasn't disclosed them.
When Reported sits close to Modelled, that is a positive signal. The company has disclosed most of its salient emissions and there's little gap for the model to fill. Even then, Modelled is the right figure to use for a like-for-like comparison across companies.
Sustainability
Snapshot
Based on reported data, retrieved with AI
- Diploma PLC (Group Parent) reported 398,508 tCO₂e in 2025.
- Scope 3 accounted for 99% of emissions.
- Reported across 4 of 15 GHG Protocol Scope 3 categories.
- Scope 2 reported under the market based methodology.
According to available emissions disclosures, Diploma PLC (Group Parent) reported total yearly emissions of 398,508 tCO₂e in 2025. Scope 3 emissions accounted for 99% of reported output, indicating supply chain activity, purchased goods and services, business travel, and wider operational dependencies were the most significant contributors to the company's carbon footprint.
The company achieved a Mycelium Score of 2.2, placing it below average for its sector for sustainability performance, and received a transparency score of 45.5, pointing to fairly limited disclosure, with notable gaps in key areas.
Total Emissions across all scopes
398,508 tCO2e (Market Based)
Scope 1 emissions
Direct emissions from sources the company owns or controls, such as fuel use, facilities and vehicles.
Scope 2 emissions
Indirect emissions from purchased energy, including electricity, heating and cooling.
Location based
5,213
tCO2eMarket based
1,043
tCO2eScope 3 emissions
Wider value chain emissions across the 15 GHG Protocol categories, from purchased goods and business travel to investments, where reported.
Cat 1
Purchased goods & services
201,585
tCO2eCat 2
Capital goods
4,733
tCO2eCat 3
Fuel & energy related activities
1,705
tCO2eCat 4
Upstream transportation & distribution
40,592
tCO2eCat 5
Waste generated in operations
1,705
tCO2eCat 6
Business travel
1,705
tCO2eCat 7
Employee commuting
1,705
tCO2eCat 8
Upstream leased assets
1,705
tCO2eCat 9
Downstream transportation & distribution
1,705
tCO2eCat 10
Processing of sold products
1,705
tCO2eCat 11
Use of sold products
106,824
tCO2eCat 12
End-of-life treatment of sold products
1,705
tCO2eCat 13
Downstream leased assets
1,705
tCO2eCat 14
Franchises
1,705
tCO2eCat 15
Investments
22,953
tCO2e11 values were derived via Mycelium's normalisation process rather than reported by the company. Cells marked “–” were not disclosed.
Contact Info
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How scoring works
How the Mycelium Score is calculated
The Mycelium Score is out of 10. Up to 6.5 points reflect carbon intensity vs sector peers (emissions normalised against revenue). The remaining 3.5 reflect data quality: third-party verified, profile claimed by the company, and full disclosure across all reporting categories.
A higher score means lower carbon intensity than sector peers, backed by data that's third-party verified, claimed by the company, and fully disclosed. Diploma PLC (Group Parent)'s score sits at the top of this page and in the score panel.
How the Transparency Score is calculated
The Transparency Score measures how much of a company's key emissions data is publicly disclosed, graded from A (very high) down to F (very low). Crucially, it weights each gap by how material that bucket is for the company's industry, so an undisclosed category where the bulk of emissions sit hurts far more than a minor one.
For Diploma PLC (Group Parent), the single biggest gap is Use of sold products (Scope 3 Category 11). Mycelium estimates it accounts for around 27% of the company's total footprint, typically the largest source of emissions for a Services company, yet it hasn't been disclosed. Leaving a bucket this large unreported is what's holding the transparency score down.
In total, roughly 27% of Diploma PLC (Group Parent)'s estimated emissions sit in categories it hasn't reported. Disclosing these would be the fastest way to raise the transparency score.
Read the full scoring methodology
Our white paper covers exactly how the Mycelium Score and Transparency Score are calculated, including the normalisation process and what earns a 10/10.
Download the white paper (PDF)
Diploma PLC (Group Parent) carbon emissions FAQs
What are Diploma PLC (Group Parent)'s carbon emissions?
In its 2025 reporting year, Diploma PLC (Group Parent) disclosed total emissions of 398,508 tCO2e across all scopes. Scope 3 accounted for the largest share, around 99% of the total.
Does Diploma PLC (Group Parent) report Scope 1, Scope 2 and Scope 3 emissions?
For 2025, Diploma PLC (Group Parent)'s available disclosure covers Scope 1 (3,732 tCO2e), Scope 2 (1,043 tCO2e), Scope 3 across 4 of the 15 GHG Protocol categories. Figures not reported by the company are shown as modelled estimates and labelled as such.
How transparent is Diploma PLC (Group Parent)'s emissions reporting?
Diploma PLC (Group Parent) has a Mycelium transparency score of 45.5 out of 100. The score weights each emissions category by how material it is for the company's industry, so it reflects whether the disclosures that matter most have been made.
Is Diploma PLC (Group Parent) sustainable?
Mycelium measures sustainability through carbon emissions data rather than giving a yes or no verdict. Diploma PLC (Group Parent) has a Mycelium Score of 2.2 out of 10, which reflects its emissions intensity against sector peers together with how transparent and well-verified its reporting is. The emissions figures, disclosure documents and climate targets on this page give the fuller picture.
Is Diploma PLC (Group Parent) environmentally friendly?
Carbon emissions are one measurable part of environmental impact, and the part Mycelium tracks. Diploma PLC (Group Parent) disclosed 398,508 tCO2e for 2025, and its Mycelium Score of 2.2 out of 10 shows how that performance compares with similar companies in its sector.
Learn more about our methodology and where this data comes from.
