WTW sustainability score: 50/100
Better than 40% of Consulting / Professional Services
Leading practice starts at 60. The highest score on SINK is 71.
WTW provides advice, insurance broking and related services in people, risk and capital. In 2025 its Health, Wealth & Career segment earned about 55% of segment revenue and Risk & Broking about 45%.
More about WTW
Willis Towers Watson Public Limited Company is incorporated in Ireland, where the parent moved its place of incorporation in 2009; its roots go back to 1828, and its principal executive offices are in London. It had about 47,000 colleagues and US$9.7 billion revenue in 2025.
Head office London, United KingdomStaff ~47,000 colleagues (Form 10-K, year to 31 December 2025)Revenue ~US$9.7B revenue (US$9,708M, year to 31 December 2025)Website ↗
WTW's footprint was 349,219 tCO2e in 2024, mostly the goods and services it buys and business travel, and it fell 13% on 2023. The figures are not externally assured, and it discloses no emissions from the insurance it places. About 31% of its electricity is renewable, through certificates, with no published split. SBTi has validated a 50% absolute cut in Scope 1 and 2 by 2030 from 2019 and a net-zero target for 2050; its near-term Scope 3 targets cover business travel per employee and supplier engagement. Press and NGOs have named it for placing insurance for fossil-fuel projects. It publishes no water data.
WTW scores 50/100 (Making progress) on SINK's independent climate assessment, scored from public data only. Scores are free. Nobody can pay to change a score, speed it up or hide it. Last verified November 2026.
That places WTW joint 158th of 1,043 companies scored, and joint 18th of 31 in Consulting / Professional Services.
What is WTW doing well, and where does it fall short?
Strongest on Targets & Commitments and Carbon Footprint: Operations (8/10, 6/10). Weakest on Water Impact and Energy Source (2/10, 3/10).
Where WTW lost points
For each question that lost points, the evidence our public rubric looks for that we didn't find.
What would raise this score
- Its effect on waterMonitor its water use and take measures to reduce it.
- How clean its energy isMove to a renewable energy tariff or make a major efficiency investment.
- Its effect on natureAssess its effect on nature and publish a basic environmental policy.
Every question that lost points
- Emissions from its own operations6/10Its own emissions aren't independently verified or tracked over several years.
- Emissions from its supply chain6/10No full value-chain map or supplier engagement programme.
- Whether its emissions are falling6/10No consistent fall over several years across its operations and supply chain.
- How clean its energy is3/10No renewable energy tariff or major efficiency investment shown.
- Its effect on nature3/10No assessment of its effect on nature, and no basic environmental policy.
- How it uses materials and handles waste3/10No active waste reduction, reuse or repair shown.
- Its effect on water2/10No monitoring of water use, or no measures to reduce it.
- Its climate targets8/10No validated long-term net zero target.
- How openly it reports6/10No mission-locked structure, such as B Corp certification.
- Its record on controversies4/10Points deducted for controversies or its business model. The finding is under question 10.
A score changes when the evidence does. We use new published evidence at the next rescore. Anyone can send us new evidence, free. How to send it.
How is WTW's SINK score calculated?
Same ten questions for every company. No private weighting.
SINK = (0.3 × Base + 0.7 × Performance) × ScaleWhat evidence is WTW's score based on?
10 sources used in this assessment. All publicly available. Each row shows which of the ten questions it informed.
10% of them were published by WTW itself; the rest come from independent sources.
“Scope 2 (market-based) 39,405 18,137 17,294 –5%”
“WTW finally commits that 67% of its suppliers by spend covering purchased goods and services, will have science-based targets by 2028”
“The CRB business places more than $30 billion of premiums into the insurance markets on an annual basis”
“the Governance Committee oversees Sustainability matters”
“approximately 47,000 colleagues serving more than 140 countries and markets”
“A group of British insurance brokers have been accused of “working in service of the oil industry””
“Marsh or Willis Tower Watson advise and provide the oil and gas companies with captive insurance”
“Only four corporations – Marsh, Aon, Willis Towers Watson and Arthur J. Gallagher – dominate the global broker market.”
“publicly commit that they will abstain from offering brokerage services for the hugely destructive and controversial EACOP project”
“Extinction Rebellion have said that several of its protesters were arrested after targeting WTW’s London office.”
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How does WTW compare with other consulting / professional services companies?
Where WTW sits among consulting / professional services peers.
Among the 31 major consulting / professional services brands we've scored, WTW is tied =18th of 31, with 1 other.
Who scores higher in Consulting / Professional Services?
The 3 companies in the sector scoring nearest above WTW.
Protect Our Winters is a climate advocacy nonprofit with a negligible operational footprint but no formal sustainability disclosure.
See the breakdown →Zen Educate's UK footprint was 508 tCO2e in 2024, down from 760 t in 2022 mainly through changes in how it counts supply-chain emissions, while its own operations' emissions rose sixfold.
See the breakdown →McKinsey reports 62% Scope 1&2 reductions and 100% renewable electricity, but its dominant emissions (Scope 3 business travel) are tracked only per-employee, not absolute.
See the breakdown →Which companies moved this week, and why.
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