Castor

Picture of the castor team
Castor logo

Castor reinvents the way companies find and understand their way around data.

Data within companies has grown exponentially, the challenge for users is no-longer "do I have the data I need", but what data they should be using and how.  Castor is building the data discovery and collaboration platform for business users, ensuring they can be truly data-driven.

Castor, based out of Paris, was founded by four data scientists, Tristan Mayer, Xavier de Boisredon, Arnaud de Turckheim and Amaury Dumoulin. Two of whom had previously seen challenges first-hand as the Heads of Data at french unicorns Payfit and Qonto.

Enterprise SaaS

Investment Total
Blossom led Castor's $23.5M Series A round. Acquired in 2025 by Coalesce.

More Series A investments

Collective enables independent freelancers to team up by mutualizing skills, networks and work methodology in a quest to enable each other to achieve more as a group vs. individually.

SaaS / HR

Team photo of Collective
  1. Country:
    France (Paris)
  2. Sector: 
    Enterprise SaaS
  3. DAte of partnership: 
    Dec 2021
Blossom led Collective's $8M Seed round.
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Sqreen protects distributed applications against sophisticated attacks by automatically detecting and tracing vulnerabilities down to the line of code. Acquired by Datadog.

Infrastructure / Security

Pierre Betouin and Jean-Baptiste Aviat profile from Sqreen
  1. Country:
    France (Paris)
  2. Sector: 
    Cybersecurity
  3. DAte of partnership: 
    Mar 2019
Blossom invested in Sqreen’s $14M Series A alongside Greylock Partners. Acquired by Datadog.
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Pigment offers an intuitive, visually-driven experience to forecast the future of your business. With flexible parameters and continuous forecasting, Pigment brings future scenarios to life through charts, models and simulations.

SaaS / Fintech

Romain Niccoli and Eléonore Crespo profile from Pigment
  1. Country:
    France (Paris)
  2. Sector: 
    Enterprise SaaS
  3. DAte of partnership: 
    Jul 2020
Blossom led Pigment’s $26M Series A round. Pigment has since gone on to raise $145M in a Series D funding round, led by ICONIQ Growth.
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Maki is building a conversational AI agent that liberates HR teams.

SaaS / HR

  1. Country:
    France (Paris)
  2. Sector: 
    Enterprise SaaS
  3. DAte of partnership: 
    Jan 2024
Blossom led Maki's $28.6M Series A
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Harmonic are forging the world's most advanced mathematical reasoning engine.

  1. Country:
    USA
  2. Sector: 
    Generative AI
  3. DAte of partnership: 
    SEP 2024
Blossom invested in Harmonic’s $75M Series A alongside Sequoia Capital
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Freshly is a direct-to-consumer brand focused on natural cosmetics. After starting in Spain, Freshly has expanded to several other geos, and become an omni-channel company opening flagship retail locations in London, Madrid and Barcelona.

Consumer / Ecommerce

Picture of the Freshly team
  1. Country:
    Spain
  2. Sector: 
    Ecommerce
  3. DAte of partnership: 
    Nov 2021
Blossom led Freshly's $21.8M Series A round.
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