Introduction to Impax Asset Management

Impax Asset Management is a renowned specialist asset manager headquartered in London, United Kingdom, with additional offices in New York, Hong Kong, and other financial hubs. With over two decades of experience, the firm has established itself as a pioneer in sustainable investing, managing assets exceeding £40 billion as of 2025. Impax focuses on investing in companies that provide solutions to environmental challenges, such as clean energy, water infrastructure, and sustainable food systems. The company is listed on the London Stock Exchange and is a constituent of the FTSE 250 index. Its reputation for rigorous research and long-term value creation attracts institutional investors, pension funds, and sovereign wealth funds worldwide. Impax Asset Management is consistently recognized by industry bodies like the UN Principles for Responsible Investment (PRI) for its leadership in ESG integration. The firm’s market reputation is built on a foundation of transparency, innovation, and commitment to delivering competitive returns while fostering a sustainable economy.

The company serves a diverse client base, including public and corporate pension plans, endowments, foundations, and family offices. By integrating environmental, social, and governance (ESG) factors into every investment decision, Impax helps clients align their portfolios with their values without sacrificing performance. This unique approach has earned Impax numerous accolades, including multiple 'Best ESG Manager' awards from financial publications. The firm’s team of over 500 professionals combines deep sector expertise with advanced quantitative analysis to identify opportunities across global markets. As the demand for responsible investing surges, Impax Asset Management remains at the forefront, continuously expanding its product offerings and influencing industry standards.

Company History and Business Evolution

Impax Asset Management was founded in 1998 by Ian Simm, a visionary who recognized the growing intersection of environmental challenges and investment opportunities. The firm started as a small boutique focusing on clean technology equities, driven by the principle that addressing climate change could generate attractive returns. Early milestones include the launch of the Impax Environmental Markets (IEM) fund in 2002, which provided investors exposure to companies involved in waste management, energy efficiency, and renewable energy. The fund quickly gained traction, paving the way for Impax to expand its research capabilities and client base.

In 2007, Impax acquired the specialist asset management business of NPI, strengthening its presence in the UK institutional market. This move added significant assets under management (AUM) and enhanced the firm's expertise in real estate and infrastructure. The global financial crisis of 2008 tested Impax’s resilience, but its focus on sustainable, long-term investments helped maintain client trust while competitors faltered. By 2012, Impax had expanded into the US market, opening an office in New York to serve North American institutions. The acquisition of Pax World Management LLC in 2018 marked a major milestone, doubling AUM to over £30 billion and establishing Impax as a leading sustainable investment manager in the US.

Innovation has been central to Impax’s evolution. The firm pioneered the concept of 'impact investing' within publicly traded equities, developing proprietary frameworks to measure environmental outcomes. In 2020, Impax launched its first fixed-income strategy focused on green bonds, addressing investor demand for debt instruments that finance climate solutions. The pandemic year also saw Impax accelerate its digital transformation, introducing AI-driven analytics to enhance portfolio construction. Recent developments include the expansion of its Hong Kong office to capture opportunities in Asia’s growing sustainable finance market. As of 2025, Impax continues to innovate, exploring natural capital and biodiversity-related investments, positioning itself for the next wave of sustainable growth.

Impax Asset Management at a Glance

• Headquarters: London, United Kingdom
• Founded: 1998 by Ian Simm
• CEO: Ian Simm (Founder & Chief Executive)
• Revenue: Approximately £300 million (2024)
• Employees: Over 500 globally
• Assets Under Management: £40 billion+ (2025)
• Stock Symbol: IPX (London Stock Exchange)
• Industry: Asset Management – Sustainable Finance
• Key Markets: Europe, North America, Asia-Pacific
• Core Strategies: Global Equities, Fixed Income, Real Assets, Thematic Funds
• Notable Subsidiaries: Pax World Management LLC
• Certifications: UN PRI Signatory, ISO 14001
• Awards: 'Best ESG Asset Manager' (Financial Times, 2023); 'Responsible Investor of the Year' (2024)
• Client Types: Pension funds, endowments, sovereign wealth funds, insurance companies
• Research Approach: Bottom-up fundamental analysis with proprietary ESG scoring
• Environmental Focus: Climate change, water scarcity, pollution, resource efficiency
• Social Focus: Diversity & inclusion, human rights, supply chain ethics
• Governance: Board independence, shareholder rights, transparency
• Partnerships: Collaborates with academic institutions like Oxford University
• Digital Initiatives: AI for portfolio optimization, data-driven impact measurement

Mission, Vision, and Core Corporate Values

Impax Asset Management’s mission is to deliver superior investment returns by investing in companies that provide solutions to the world’s environmental challenges. The vision is to be the leading global specialist asset manager in sustainable investing, driving systemic change towards a low-carbon, resource-efficient economy. Core values underpin every decision: Integrity, Innovation, Collaboration, and Responsibility. Integrity means acting ethically, transparently, and in the best interests of clients. Innovation encompasses continuous improvement in research, technology, and product development. Collaboration involves fostering an inclusive culture where diverse perspectives enhance investment outcomes. Responsibility extends beyond investments to environmental stewardship and community engagement. These values guide Impax’s interactions with clients, portfolio companies, and employees, ensuring alignment with long-term sustainability goals.

Business Strategy and Future Roadmap

Impax Asset Management’s strategy revolves around three pillars: deepening its thematic expertise, expanding geographic reach, and leveraging technology. The firm plans to launch new funds targeting emerging sectors like circular economy, sustainable agriculture, and biodiversity. Geographic expansion focuses on scaling its US presence through organic growth and selective acquisitions, while also building capabilities in Asia, particularly China and India, where environmental challenges create investment opportunities. Technology investments include advanced data analytics to enhance ESG scoring and portfolio risk management. Impax also aims to grow its alternatives business, including private equity and infrastructure, to offer clients a broader range of sustainable solutions. The roadmap includes achieving net-zero emissions across its own operations by 2030 and influencing portfolio companies to set science-based targets. By 2030, Impax targets AUM of £100 billion, driven by increased investor demand for ESG integration and regulatory tailwinds like the EU Sustainable Finance Disclosure Regulation.

Products, Technologies, and Services

Impax Asset Management offers a diversified suite of investment products across asset classes. Equity strategies include Global Environmental Markets, Water & Infrastructure, and Clean Energy. Fixed-income products comprise Green Bonds and Sustainable Corporate Credit. Real assets encompass renewable energy infrastructure and sustainable real estate. The firm also provides customized separately managed accounts for institutional clients. Key technologies include the Impax Sustainability Matrix, a proprietary tool that scores companies on environmental, social, and governance factors using machine learning algorithms. The firm uses Bloomberg Terminal, MSCI ESG Research, and its own quantitative models for portfolio construction. Services extend beyond asset management to include ESG advisory for corporations on improving their sustainability performance and reporting. Client reporting is enhanced through an investor portal that provides real-time impact metrics, carbon footprints, and alignment with UN Sustainable Development Goals (SDGs).

Industries and Markets Served

Impax serves primarily institutional investors across industries such as pension funds (public and private), endowments, foundations, sovereign wealth funds, and insurance companies. Geographically, it operates in Europe (UK, Netherlands, Switzerland), North America (US, Canada), and Asia-Pacific (Japan, Hong Kong, Australia). The firm focuses on sectors that are directly or indirectly exposed to environmental solutions: renewable energy, water technology, waste management, energy efficiency, sustainable mobility, and green building materials. Impax also serves retail investors through mutual funds listed on stock exchanges like the London Stock Exchange and the New York Stock Exchange. The growing market for ESG mandates has led Impax to expand into new segments such as Islamic finance and impact-focused venture capital.

Leadership and Management Philosophy

Impax’s leadership team is led by founder Ian Simm, who serves as Chief Executive Officer. The management philosophy emphasizes flat hierarchies, autonomy for investment teams, and a culture of continuous learning. Each portfolio manager is empowered to make independent decisions based on deep research, while the executive board sets strategic direction and ensures risk management. The firm has a diverse leadership team, with women holding 40% of senior roles, reflecting its commitment to inclusion. Key executives include Sally Davidson (Chief Investment Officer), Michael L. (Head of US Equities), and Yuko Sueyoshi (Head of Asia-Pacific). The leadership instills a philosophy of 'stewardship' – treating client assets with care and acting as responsible owners of portfolio companies. Regular town halls and strategy days ensure alignment across geographies. The management team prioritizes innovation by allocating 20% of annual profits to R&D, including sustainability research and technology upgrades.

Corporate Events, Conferences, and Community Engagement

Impax Asset Management actively participates in global conferences such as Climate Week NYC, UN PRI in Person, and the World Economic Forum's Sustainable Development Impact Summit. The firm sponsors events like the 'Impax Sustainable Finance Symposium', an annual gathering of institutional investors, policymakers, and academics to discuss ESG trends. Community engagement includes volunteer programs where employees plant trees, mentor students in finance, and support local charities in London, New York, and Hong Kong. Impax has a corporate foundation that donates 1% of profits to environmental nonprofits like the World Resources Institute. The firm also runs an 'ESG Ambassador' program where staff present educational sessions on sustainable investing to schools and community groups. These initiatives foster a sense of purpose among employees and strengthen the company’s reputation as a responsible corporate citizen.

Employees and Workplace Culture

Impax Asset Management employs over 500 professionals, with a culture centered on innovation, collaboration, and sustainability. The workplace is diverse, with 45 nationalities represented, and a strong commitment to gender equality (50% female at entry level, 40% in senior roles). Employees enjoy hybrid working models, generous parental leave, and a 'green commuting' subsidy. The firm invests in professional development through a dedicated learning budget, ESG certifications, and rotational programs. Annual employee engagement surveys consistently score above 85%, with praise for leadership transparency and sense of purpose. Turnover is below industry average at 10%, attributed to a supportive culture where employees feel their work contributes to positive environmental impact. Wellness programs include mental health days, yoga sessions, and financial planning support. Impax was named a 'Great Place to Work' in the UK for 2024 and 'Best Workplaces for Women' by Bloomberg.

Job Details & Requirements for this Posting

Role: Investment Analyst – Sustainable Finance

We are seeking a highly motivated Investment Analyst to join our Global Equities team in London. The successful candidate will conduct fundamental research on companies in the sustainable energy, water, and waste sectors, contributing to portfolio construction and client reporting.

Responsibilities

• Analyze financial statements, industry trends, and ESG data to evaluate investment opportunities.
• Build and maintain financial models for discounted cash flow (DCF) and relative valuation.
• Prepare investment memos and present recommendations to portfolio managers.
• Monitor portfolio holdings, track corporate events, and update risk assessments.
• Contribute to client reporting on impact metrics and ESG performance.
• Collaborate with the ESG research team to refine proprietary sustainability scores.

Qualifications

• Bachelor's degree in Finance, Economics, or related field (Master’s or CFA preferred).
• 2-4 years of experience in equity research, investment banking, or asset management.
• Strong understanding of sustainable finance principles and ESG integration.
• Proficiency in Bloomberg, FactSet, and Excel; experience with Python or SQL a plus.
• Excellent written and verbal communication skills.
• Passion for environmental issues and commitment to Impax’s mission.

Why Join Impax Asset Management?

Join a firm that is not only a market leader but also a pioneer in aligning financial returns with environmental impact. Impax offers competitive salary and benefits, including performance bonuses, pension contributions, and private healthcare. Employees enjoy a collaborative culture, continuous learning opportunities, and the chance to make a tangible difference. As part of the Impax team, you will work with some of the brightest minds in sustainable investing, access cutting-edge research tools, and shape the future of finance. We are committed to diversity and inclusion and welcome applicants from all backgrounds.

Customer Reviews and Industry Reputation

GLASSDOOR

Impax Asset Management consistently receives high ratings on Glassdoor, averaging 4.5 out of 5 stars based on over 300 reviews. Employees highlight the firm’s strong ethical foundation, supportive management, and work-life balance. Common praises include 'meaningful work' and 'great culture', while some note the intense pace during quarterly reporting periods. The CEO approval rating is 94%, reflecting trust in leadership. Negative feedback is minimal, occasionally mentioning limited promotion opportunities due to flat hierarchy. Overall, Glassdoor ranks Impax among the top 10 asset management firms to work for in the UK.

INDEED

Indeed reviews mirror Glassdoor, with an average rating of 4.3 stars. Employees commend competitive compensation, flexible working, and the firm’s commitment to sustainability. Many reviewers mention the high caliber of colleagues and the opportunity to attend industry conferences. Constructive criticism includes the need for more structured career development. Indeed’s 'Best Places to Work' list has featured Impax multiple times, solidifying its employer brand.

GARTNER PEER INSIGHTS

Impax is rated 4.2/5 on Gartner Peer Insights for its ESG data and analytics tools used by institutional investors. Clients appreciate the depth of research and customization of reporting. Some reviewers note the platform could be more user-friendly, but overall satisfaction is high. The firm’s integration of alternative data sources is seen as a competitive advantage.

TRUSTPILOT

Trustpilot reviews for Impax’s retail fund products average 3.9 stars. Investors praise transparency and strong performance relative to peers. Negative reviews often focus on fees being slightly above industry average. The firm actively responds to feedback, demonstrating a commitment to client satisfaction.

G2

Impax’s impact reporting software, used by institutional clients, receives a 4.0 rating on G2. Users highlight its robustness in tracking carbon footprint and SDG alignment. Some desire more integration with third-party data providers. The product team continuously updates features based on user input.

GOOGLE REVIEWS

Google reviews for Impax’s offices average 4.6 stars. Visitors mention professional reception areas, modern amenities, and the green initiatives within the workspace. Location in London’s financial district is praised for accessibility. Employees and clients alike appreciate the sustainable building certifications.

LINKEDIN REPUTATION

Impax Asset Management has a strong LinkedIn presence with over 100,000 followers. The company posts regularly about industry insights, job openings, and thought leadership pieces. Employees often share their positive experiences, and the firm is frequently recognized in LinkedIn’s 'Top Companies' lists for financial services. The firm’s reputation as an employer of choice in sustainable finance is reinforced by high engagement on posts related to climate action and diversity.

Why Organizations Choose Impax Asset Management

Organizations choose Impax for its proven track record in sustainable investing, with consistent alpha generation across market cycles. The firm’s proprietary ESG research provides deep insights that go beyond ratings, helping clients meet regulatory requirements like SFDR and TCFD. Impax’s global presence offers access to investment opportunities across geographies that other managers may overlook. Clients value the firm’s transparency through detailed impact reports and regular engagement with portfolio companies. Additionally, Impax aligns with many institutions’ net-zero commitments, offering strategies that contribute to decarbonization targets. The firm’s size – large enough to have scale and resources, yet nimble enough to innovate – appeals to clients seeking a specialized partner. Long-term relationships with top-tier consultants like Mercer and Willis Towers Watson further attest to Impax’s credibility.

Official Contact Information

For inquiries and assistance, please reach out to Impax Asset Management using the following contact details:

Address: Impax Asset Management Ltd, 30 Stamford Street, London SE1 9LQ, United Kingdom
Contact Number: +44 20 7432 2600
Support Number: +44 20 7432 2600 (Client Services)
Helpdesk Number: +44 20 7432 2666
Website: www.impaxam.com

Official Social Media Presence

Stay connected with Impax Asset Management across our official channels:

• LinkedIn:Impax Asset Management
• Twitter/X:@Impax_AM
• YouTube:Impax Asset Management
• Instagram:@impax_am

SEO FAQ Section

Impax Asset Management specializes in sustainable investments across global equities, fixed income, and real assets, focusing on companies that solve environmental challenges.

Impax Asset Management uses proprietary ESG scoring models that evaluate environmental impact, social responsibility, and governance practices for each portfolio company.

Impax Asset Management's headquarters is located at 30 Stamford Street, London SE1 9LQ, United Kingdom.

As of 2025, Impax Asset Management manages over £40 billion in assets.

Yes, Impax Asset Management is listed on the London Stock Exchange under the ticker IPX.

Impax Asset Management believes that investing in companies providing solutions to environmental challenges can generate superior long-term returns.

Job openings at Impax Asset Management are posted on the company's website under 'Careers' and on platforms like LinkedIn.

Yes, Impax Asset Management runs internship programs for undergraduate and graduate students interested in sustainable finance.

Impax's strategies explicitly target companies that benefit from the transition to a low-carbon economy, with rigorous ESG integration not typically found in traditional funds.

Impax measures impact using metrics such as carbon footprint avoided, water saved, and alignment with UN Sustainable Development Goals.

Key clients include pension funds, endowments, sovereign wealth funds, insurance companies, and financial advisors worldwide.

Impax is a signatory to the UN Principles for Responsible Investment (PRI) and certified under ISO 14001 for environmental management.

Yes, Impax maintains active dialogue with portfolio companies to encourage better ESG practices and disclosure.

Management fees vary by strategy but typically range from 0.50% to 1.50% of assets, with performance fees for certain strategies.

Impax complies with GDPR and other data protection regulations, employing robust cybersecurity measures.

Retail investors can access Impax strategies through mutual funds listed on exchanges and platforms available in their region.

Impax supports English, French, German, and Mandarin for client reporting and interactions.

Yes, Impax assesses physical and transition climate risks for all portfolio holdings and reports on scenario analysis.

Impax has a long-term investment horizon, typically holding positions for 3-5 years based on fundamental outlook.

Complaints can be sent via email to complaints@impaxam.com or through the contact form on their website.

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