| 2025 | Nature Multi-Country Controlled Study Multiple universities / Nature Human Behaviour | 🌍 Global | 2,896 employees across 141 organizations | Burnout reduced by 0.44 points on standardized scale | |
| 2025 | Tokyo Metropolitan Government 4-Day Week Tokyo Metropolitan Government | 🇯🇵 Japan | 160,000+ government workers | Largest single-employer 4-day week adoption globally | |
| 2024 | UK Pilot One-Year Follow-Up Autonomy / 4 Day Week Global | 🇬🇧 UK | 61 original pilot companies | 89% of companies (54 of 61) still operating 4-day week after one year | |
| 2024 | Germany 4 Day Week Pilot 4 Day Week Global / Intraprenör / University of Münster | 🇩🇪 Germany | 45 companies, ~600 workers | 73% of companies plan to continue | |
| 2024 | Portugal Government-Backed Pilot 4 Day Week Global / Portuguese Government | 🇵🇹 Portugal | 41 companies, 1,000+ employees | 95% of companies rated the experience positively | |
| 2024 | Brazil 4 Day Week Pilot 4 Day Week Global / Reconnect Happiness at Work | 🇧🇷 Brazil | 21 companies | 90% of companies continuing with 4-day week | |
| 2024 | Golden, Colorado Police Department Pilot City of Golden, Colorado | 🇺🇸 USA | Police department staff | Priority 1 response times improved by 5% | |
| 2024 | Exos / Wharton 4-Day Work Week Study Exos / University of Pennsylvania (Wharton) | 🇺🇸 USA | 3,000+ employees | Burnout dropped from 70% to 36% | |
| 2024 | APA Work in America Survey American Psychological Association / Harris Poll | 🇺🇸 USA | 2,027 adults | Employer adoption of 4-day weeks rose from 14% (2022) to 22% (2024) | |
| 2023 | Spain Government Pilot Spanish Government | 🇪🇸 Spain | ~200 companies (expected) | Government provides subsidies: 100% year 1, 50% year 2, 33% year 3 | |
| 2023 | South Africa 4 Day Week Pilot 4 Day Week South Africa | 🇿🇦 South Africa | 28 companies | 92% of companies continuing with 4-day week | |
| 2023 | Australasia (AU/NZ) Pilot 4 Day Week Global / Swinburne University of Technology | 🇦🇺 Australia | Multiple companies across AU and NZ | 96% of employees wanted to continue | |
| 2023 | South Cambridgeshire District Council Pilot South Cambridgeshire District Council | 🇬🇧 UK | Council staff (~600) | Significant improvements in staff performance and retention | |
| 2023 | Gallup Workplace Engagement Analysis Gallup | 🌍 Global | Global workforce data | Flexibility is a key driver of workplace engagement | |
| 2022 | UK 4 Day Week Pilot 4 Day Week Global / Autonomy / University of Cambridge | 🇬🇧 UK | 61 companies, 2,900 workers | 92% of companies (56 of 61) kept the 4-day week | |
| 2022 | Ireland 4 Day Week Pilot 4 Day Week Ireland | 🇮🇪 Ireland | 12 companies (completed) | All 12 companies that completed the trial continued | |
| 2022 | US & Canada 4 Day Week Pilot 4 Day Week Global | 🇺🇸 USA | 33 companies | Revenue increased 8% during trial period | |
| 2022 | UAE Federal Government 4.5-Day Week UAE Federal Government | 🇦🇪 United Arab Emirates | ~90,000 federal employees | First country globally to adopt a shortened government work week | |
| 2022 | Belgium 4-Day Week Legislation Belgian Federal Government | 🇧🇪 Belgium | National policy (all workers) | First EU country to give workers legal right to request a 4-day week | |
| 2022 | Wales 4-Day Week Feasibility Study Future Generations Commissioner for Wales / Autonomy | 🇬🇧 UK | Welsh public sector modeling | 4-day week in Welsh public sector could create ~38,000 new jobs | |
| 2022 | Kickstarter 4 Day Week Adoption Kickstarter | 🇺🇸 USA | ~90 employees | OKR achievement rose from 70% to 90%+ | |
| 2022 | Bolt 4 Day Week Implementation Bolt | 🇺🇸 USA | ~550 employees | 94% of employees wanted to keep the 4-day week | |
| 2021 | Iceland Public Sector Trial Autonomy / Alda | 🇮🇸 Iceland | 2,500 workers (1% of workforce) | Productivity maintained or improved across the majority of trial workplaces | |
| 2021 | Unilever New Zealand Trial Unilever | 🇳🇿 New Zealand | 81 employees | Productivity maintained against business targets | |
| 2021 | Atom Bank Permanent Adoption Atom Bank | 🇬🇧 UK | 430 employees | No reduction in salary (37.5-hour to 34-hour weeks) | |
| 2021 | Environmental Impact Study Platform London / 4 Day Week Campaign | 🇬🇧 UK | Modeling study | 21.3% potential reduction in UK carbon footprint | |
| 2020 | Buffer 4 Day Week Trial Buffer | 🇺🇸 USA | 89 employees | 91% of employees reported being happier | |
| 2019 | Microsoft Japan Work-Life Choice Challenge Microsoft Japan | 🇯🇵 Japan | 2,300 employees | 39.9% productivity boost (sales per employee vs. previous year) | |
| 2019 | Henley Business School Survey Henley Business School | 🇬🇧 UK | 500+ business leaders, 2,000+ employees | 63% of businesses said 4-day week helped attract talent | |
| 2018 | Perpetual Guardian Trial Perpetual Guardian / Auckland University | 🇳🇿 New Zealand | 240 employees | Staff who felt able to manage their work-life balance: 54% → 78% | |