Guiding businesses toward a sustainable future

Transition & Co is a European consulting firm driving CSR, ESG, and CSRD strategies through consultancy, training, and product innovation.

Combining the expertise of top-tier firms with the agility of a boutique agency, we simplify regulations, accelerate sustainable transformation, and deliver pragmatic, people-centered solutions.

Turning complexity into clarity, side by side with you

Transition & Co combines deep expertise in finance, innovation, regulations, and CSR to simplify the regulatory complexities of the ecological transition.

With structured yet practical methodologies, we guide businesses through their transformation with a strategic, hands-on, and impact-driven approach.

We work hand in hand with executives and teams, closely collaborating with CSR and impact leaders to drive real, lasting change.

Our services

Assessment and implementation of impactful CSR strategies

CSRD compliance and regulatory alignment

Defining corporate purpose and mission

Certification guidance (B Corp, Ecovadis, etc.)

ESG audits and due diligence

Sustainable business models, innovation, and responsible supply chains

Stakeholder engagement strategies

CSRD essentials

Tailored ESG training for leadership and teams

Engaging workshops (climate, diversity and inclusion, finance, and more)

Our services

Assessment and implementation of impactful CSR strategies

CSRD compliance and regulatory alignment

Defining corporate purpose and mission

Certification guidance (B Corp, Ecovadis, etc.)

ESG audits and due diligence

Sustainable business models, innovation, and responsible supply chains

Stakeholder engagement strategies

CSRD essentials

Tailored ESG training for leadership and teams

Engaging workshops (climate, diversity and inclusion, finance, and more)

Our insights

A curated, collaborative resource hub to help you navigate sustainability -no matter your role or sector.

At Transition & Co, we believe that businesses have the power -and the responsibility– to drive meaningful change in the world. Our mission is to help them rise to today’s greatest societal challenges with strategic and impact-driven solutions.

In 2020, after a career at the crossroads of European policy, finance, innovation, and impact, Charlotte Guériaux Reynal founded the firm with a clear ambition: to bridge strategy and sustainability, guiding organizations toward a future where performance and positive impact go hand in hand.

Today, Charlotte leads a passionate and committed team, supported by a dynamic network of experts, partners, and freelancers across France, Europe, and the United States.

At Transition & Co, we believe that businesses have the power -and the responsibility– to drive meaningful change in the world. Our mission is to help them rise to today’s greatest societal challenges with strategic and impact-driven solutions.

In 2020, after a career at the crossroads of European policy, finance, innovation, and impact, Charlotte Guériaux Reynal founded the firm with a clear ambition: to bridge strategy and sustainability, guiding organizations toward a future where performance and positive impact go hand in hand.

Today, Charlotte leads a passionate and committed team, supported by a dynamic network of experts, partners, and freelancers across France, Europe, and the United States. This ecosystem allows us to craft tailored, collaborative, and forward-thinking solutions, designed to help businesses turn sustainability challenges into opportunities for transformation and growth.

Our latest publications

CSRD reporting requirements >

Our founder shares insights with Novethic on the “simplification shock” of the CSRD, regulatory uncertainties, and the challenges faced by European companies.

Transition & Co Joins the 2025 Mapping of Transition Consulting Firms >

We are proud to be recognized among the leading experts in environmental and social transition in France..

Companies and the future European Due Diligence Duty >

Our founder discusses with Novethic the key challenges of the upcoming European due diligence directive, the CSDDD (Corporate Sustainability Due Diligence Directive).

Investment Funds and ESG: Preparing for CSRD Implementation >

Speaking at a conference hosted by Birdeo, we provided expert insights on how investment funds can align with the CSRD, transform their business models, and enhance their extra-financial reporting..

New online training: sustainability & purpose-driven business >

Learn how to define your vision and mission, build a more sustainable business, and implement your CSR strategy, with our experts contributing to the training modules.

Our approach

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Contact Us

Schedule a meeting

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