# Ker

> KER is a privately held French accounting and advisory firm founded in 2023, headquartered in Nantes, focused on digitalized accounting, tax/legal compliance and strategic business support for entrepreneurs and SMEs, with a Guyane office.

Company page on Leadbay: https://mad-max.leadbay.ai/company/kerconseil.fr · loaded 2026-10-28

## At a glance

- Website: https://kerconseil.fr
- Team based in: Nantes (kerconseil.fr and 1 more)
- Founders: Yvonnick Rouat
- Industry: Accounting
- Employees: 42 (employees and founders, investors not counted; kerconseil.fr and 1 more)
- Seen in its site's code: Google Tag Manager (googletagmanager.com/gtm.js), Google Analytics (googletagmanager.com/gtag/js), Microsoft Clarity (clarity.ms/tag), WordPress (/wp-content/), Axeptio (static.axept.io), Google Workspace (MX smtp.google.com) (read 2026-10-30)

## What it sells, to whom

- KER is a privately held French accounting and advisory firm founded in 2023, headquartered in Nantes, focused on digitalized accounting, tax/legal compliance and strategic business support for entrepreneurs and SMEs, with a Guyane office. ([kerconseil.fr](https://kerconseil.fr/), [kerconseil.fr](https://kerconseil.fr/mentions-legales/), [kerconseil.fr](https://kerconseil.fr/expert-comptable-nantes/))

## Products and services

- Accounting and annual accounts preparation ([kerconseil.fr](https://kerconseil.fr/), [kerconseil.fr](https://kerconseil.fr/nous-rejoindre/), [kerconseil.fr](https://kerconseil.fr/expert-comptable-start-up/))
- Tax and social declarations ([kerconseil.fr](https://kerconseil.fr/), [kerconseil.fr](https://kerconseil.fr/nous-rejoindre/), [kerconseil.fr](https://kerconseil.fr/expert-comptable-start-up/))
- Fiscal and legal advice ([kerconseil.fr](https://kerconseil.fr/), [kerconseil.fr](https://kerconseil.fr/nous-rejoindre/), [kerconseil.fr](https://kerconseil.fr/expert-comptable-start-up/))
- Payroll and social-declaration management ([kerconseil.fr](https://kerconseil.fr/), [kerconseil.fr](https://kerconseil.fr/nous-rejoindre/), [kerconseil.fr](https://kerconseil.fr/expert-comptable-start-up/))
- Financial audits and controls ([kerconseil.fr](https://kerconseil.fr/), [kerconseil.fr](https://kerconseil.fr/nous-rejoindre/), [kerconseil.fr](https://kerconseil.fr/expert-comptable-start-up/))
- Strategic business and KPI advisory ([kerconseil.fr](https://kerconseil.fr/), [kerconseil.fr](https://kerconseil.fr/nous-rejoindre/), [kerconseil.fr](https://kerconseil.fr/expert-comptable-start-up/))
- Startup support, including fundraising, cash management, forecasting and part-time CFO services ([kerconseil.fr](https://kerconseil.fr/), [kerconseil.fr](https://kerconseil.fr/nous-rejoindre/), [kerconseil.fr](https://kerconseil.fr/expert-comptable-start-up/))
- Pennylane-based digital accounting and real-time financial reporting; KER states it is a certified Pennylane integrator/partner ([kerconseil.fr](https://kerconseil.fr/), [kerconseil.fr](https://kerconseil.fr/nous-rejoindre/), [kerconseil.fr](https://kerconseil.fr/expert-comptable-start-up/))

## Customers and markets

- **Customers**: More than 100 clients in the Nantes metropolitan area and Loire-Atlantique, including technology startups, healthcare professionals, real-estate investors and construction companies., Goodflair (publicly described case study/customer)., Customer testimonials are published on KER’s Pennylane page, including Jérôme B. and Ludivine R. ([kerconseil.fr](https://kerconseil.fr/expert-comptable-nantes/), [kerconseil.fr](https://kerconseil.fr/expert-comptable-pennylane/))
- **Markets**: France, with established operations in Nantes and a new Rémire-Montjoly, French Guiana office. ([kerconseil.fr](https://kerconseil.fr/), [kerconseil.fr](https://kerconseil.fr/expert-comptable-pennylane/), [fr.linkedin.com](https://fr.linkedin.com/company/kerconseil))
- **Markets**: Entrepreneurs, TPEs and PMEs, including start-ups and companies in real estate, construction, digital agencies, healthcare, restaurants, associations and training. ([kerconseil.fr](https://kerconseil.fr/), [kerconseil.fr](https://kerconseil.fr/expert-comptable-pennylane/), [fr.linkedin.com](https://fr.linkedin.com/company/kerconseil))

## Team

- Yvonnick Rouat, Founder/associé fondateur and president

## Latest news

- 2025-10-09 · [KER mise sur GoCardless pour automatiser ses prélèvements et accélérer sa croissance – Moreno Conseil](https://www.morenoconseil.com/ker-mise-sur-gocardless-pour-automatiser-ses-prelevements-et-accelerer-sa-croissance/) (morenoconseil.com)
- 2025-03-12 · [#312 - Interview Des Pépites - KER | Les Pépites Tech](https://lespepitestech.com/blog/2025/03/12/312-interview-des-pepites-ker) (lespepitestech.com)
- 2024-12-15 · [Le métier de collaborateur comptable en pleine mutation](https://ressources.lamacompta.co/le-metier-de-collaborateur-comptable-en-pleine-mutation/) (ressources.lamacompta.co)

## Where to find more

- [This page in Markdown, for agents](https://mad-max.leadbay.ai/company/kerconseil.fr.md)

## Decision makers

- [Yvonnick Rouat](https://mad-max.leadbay.ai/person/yvonnick-rouat--kerconseil.fr.md), Founder/associé fondateur and president

Work emails and direct phones come with a Leadbay account: https://wow.leadbay.ai/?register=true

Where it comes from: 21 sites read (kerconseil.fr, societe.com, linkedin.com, fr.linkedin.com, compara-paie.fr, lamacompta.co, francenum.gouv.fr, gocardless.com, …).

## Best angle

2026-10-28 · Headcount: Headcount up 75% in a year (1 source)

## Signals: what happened

- 2026-10-28 · Headcount: Headcount up 75% in a year (1 source: [A company database](https://kerconseil.fr/))
- 2026-10-20 · News: Nouvel article sur le blog: pourquoi anticiper le prévisionnel N+1 dès octobre change la donne. (1 source: [fr.linkedin.com](https://fr.linkedin.com/posts/kerconseil_nouvel-article-sur-le-blog-pourquoi-anticiper-activity-7518208929584136193-xkDw))
- 2026-10-15 · News: Rémunération ou dividendes: l'un des arbitrages les plus structurants pour un dirigeant, et l'un de ceux qui se préparent le plus mal dans l'urgence. (1 source: [fr.linkedin.com](https://fr.linkedin.com/posts/kerconseil_r%C3%A9mun%C3%A9ration-ou-dividendes-lun-des-arbitrages-activity-7516385020048064512-0wz-))
- 2026-10-09 · News: 🌹 Cap sur le désert marocain: l’aventure Rallye Roses des Sables 2026 commence! 🇲🇦 (1 source: [fr.linkedin.com](https://fr.linkedin.com/posts/kerhospitality_rose-des-sables-activity-7514348199365476352-JvL_))
- 2026-10-08 · News: Le 15 décembre, c'est le 4ᵉ acompte d'impôt sur les sociétés. (1 source: [fr.linkedin.com](https://fr.linkedin.com/posts/kerconseil_le-15-d%C3%A9cembre-cest-le-4%E1%B5%89-acompte-dimp%C3%B4t-activity-7513848329806430208-d2lK))
- 2026-10-07 · News: KER est désormais installé à Rémire-Montjoly. (1 source: [fr.linkedin.com](https://fr.linkedin.com/posts/kerconseil_ouverture-ker-guyane-activity-7513497465275449345-UGj5))
- 2026-10-06 · News: Le prévisionnel de l'an prochain, on le construit souvent en mars... (1 source: [fr.linkedin.com](https://fr.linkedin.com/posts/kerconseil_le-pr%C3%A9visionnel-de-lan-prochain-on-le-construit-activity-7513123970351603713-bNuF))
- 2026-10-05 · News: Il y a 3 ans, KER, c'était une idée et un bureau à Nantes. (1 source: [fr.linkedin.com](https://fr.linkedin.com/posts/kerconseil_3-ans-de-ker-activity-7512761478358220802-uoLJ))
- 2026-09-28 · Interviews: Brian Ker (1 source: [linkedin.com](https://www.linkedin.com/posts/brian-ker-5024899_the-industrial-real-estate-podcast-activity-7500518996690063360-PLFw))
- 2026-05-11 · News: KER : Comment le cabinet nantais bouscule les codes de l’expertise comptable traditionnelle ? (1 source: [lunion.fr](https://www.lunion.fr/id805093/article/2026-05-11/kerconseil-comment-le-cabinet-nantais-bouscule-les-codes-de-lexpertise-comptable))
- 2026-04-28 · Expansion: 🥨 Un nouveau chapitre s’ouvre pour KER Hospitality à... Strasbourg. (1 source: [fr.linkedin.com](https://fr.linkedin.com/posts/kerhospitality_tribe-strasbourg-centre-gare-rebranding-activity-7454799375844663296-EApl))
- 2026-03-24 · News: 📰 Mercredi 18, nous avons eu le plaisir d’inaugurer l’Ibis Budget Pontorson Baie du Mont Saint-Michel, un projet qui incarne parfaitement notre vision de l’hospitalité: moderne et tournée vers l’expérience client. (1 source: [fr.linkedin.com](https://fr.linkedin.com/posts/kerhospitality_mercredi-18-nous-avons-eu-le-plaisir-activity-7442138514378461184-R51Z))

## Working on now

- Digital accounting and strategic advice for entrepreneurs, TPEs and PME, centered on real-time reporting and automation through Pennylane.
- Electronic-invoicing compliance ahead of the September 2026 reform: audit, platform selection, ERP/PA connection, e-reporting and go-live support via a structured 90-day plan.
- Expansion in French Guiana: KER announced its Rémire-Montjoly office in October 2026, applying the Nantes model while adding expertise in overseas-specific schemes.
- Sector coverage includes real estate, construction, start-ups, digital agencies, healthcare, restaurants, associations and training organizations.

From: [Blog - KER](https://kerconseil.fr/blog/), [KER : Expert Comptable](https://kerconseil.fr/), [Votre expert-comptable Pennylane](https://kerconseil.fr/expert-comptable-pennylane/), [Accompagnement facture électronique](https://kerconseil.fr/accompagnement-facture-electronique/), [KER | LinkedIn](https://fr.linkedin.com/company/kerconseil)

## Summary

KER is a Nantes-based accounting and advisory firm founded in 2023 by Yvonnick Rouat [1][2][3]. The firm serves as a digital-first partner for entrepreneurs, including startups, SMEs, medical professionals, e-commerce businesses, and associations [2][3]. It provides services such as accounting, tax and legal declarations, payroll, and strategic financial consulting, leveraging the Pennylane platform for automation and real-time reporting [4][1][2]. Regarding investments, the company is an independent cabinet founded by Yvonnick Rouat; there is no public record of external venture funding [1][2]. Competitors generally include other digital-native accounting firms and traditional local chartered accountants. As of August 2026, KER is officially recognized as a France Num activator, supporting businesses with their digital transformation [5]. The firm maintains a workforce of approximately ten employees and operates in both Nantes and French Guiana [3].

[1]: https://fr.linkedin.com/posts/yvonnick-rouat_lancement-entrepreneuriat-conseilfiscal-activity-7109448329167532032-Uagi "🎉 Lancement du cabinet d'Expertise Comptable KER 🎉 | Yvonnick ROUAT"
[2]: https://compara-paie.fr/cabinets/kerconseil "KER — Cabinet de paie à Nantes"
[3]: https://lamacompta.co/cabinets/ker "Emploi KER : cabinet d'expertise comptable recrute | Lamacompta"
[4]: https://kerconseil.fr/expert-comptable-pennylane/ "Votre expert-comptable Pennylane"
[5]: https://www.francenum.gouv.fr/activateurs/ker "KER - francenum.gouv.fr"
[6]: https://kerconseil.fr/ "KER : Expert Comptable"
[7]: https://kerconseil.fr/expert-comptable-nantes/ "KER : Votre Cabinet d'Expertise Comptable à Nantes"
[8]: https://gocardless.com/stories/ker "Customer Stories |"

## Sources

- [Ker's website](https://kerconseil.fr)
- [Blog - KER](https://kerconseil.fr/blog/)
- [Accompagnement facture électronique](https://kerconseil.fr/accompagnement-facture-electronique/)
- [KER | LinkedIn](https://fr.linkedin.com/company/kerconseil)
- [Mentions légales - KER](https://kerconseil.fr/mentions-legales/)
- [yvonnick rouat](https://linkedin.com/in/yvonnick-rouat)
- [Société KER à NANTES (44100). Chiffre d'affaires, extrait Kbis, bénéfice, statuts, extrait RNE, bilans, actionnaires - 977839307](https://www.societe.com/societe/ker-977839307.html)