Who founded Planet OS?

Planet OS was founded by Rainer Sternfeld, Kalle Kagi in 2012.

Who are Planet OS's investors?

Planet OS's investors include Trind Ventures.

How much funding has Planet OS raised?

Planet OS has disclosed $5M raised across 1 round.

Where is Planet OS headquartered?

Planet OS is headquartered in Sunnyvale, US.

Planet OS

Sunnyvale, US · Founded 2012 · Delaware corporation · 2 employees on LinkedIn · 1 known investors

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Planet OS provides streamlined access to weather, climate and environmental data from leading data providers.

Also known as Planet OS

Founders & leadership

Planet OS was founded in 2012 by Rainer Sternfeld and Kalle Kagi.

Rainer Sternfeld Founder & CEO2012–2017Rainer Sternfeld is co-founder and former CEO of Planet OS, an Earth observation company focused on data interoperability, which was acquired by Intertrust in 2017. He holds a Master's degree in Mechanical Engineering from TalTech and has over 20 years of experience in technology leadership across the U.S., Europe, and Japan, including roles in industrial innovation at ABB Baltics and as founder of the NordicNinja VC fund.

Kalle Kagi COO, Co-founder2012–2017Kalle Kagi spent 13 years in data, product, and operations roles at Planet OS and Intertrust before focusing on new initiatives.

Board

Talal Shamoon Board Member2012–2017Chief Executive Officer at Intertrust

Investors · 1

Trind VenturesreportedTallinn · $108K – $1.1M

How we know: a partner's Signal profile · the VCSheet dataset · Not right? Tell us

Reported raises · per SEC filings

Form D private placements

$5M disclosed across 1 round · 2016

▶$5MraisedMar 2016 · 5 investors · Other Technology

Rule 506(b)

Officers, directors & promoters on the filing

Talal ShamoonDirector
Rainer SternfeldExecutive Officer, Director
Kalle KagiExecutive Officer, Director

Offering amount: $13M
Amount sold: $5M
Proceeds to insiders: $218.7K
First sale: Mar 2016
Incorporated: Corporation, Delaware, 2012
Federal exemptions: 06b

Full filing on SEC EDGAR ↗

Source: SEC EDGAR Form D. Amounts as filed; amended filings shown once at their latest values.

Company profile

researched Aug 2026

Planet OS offers access to weather, climate and environmental datasets aggregated from external data providers, positioning its service as a way for customers to avoid building and maintaining their own data-integration pipelines. Its stated sector focus spans research and education, climate adaptation and broader climate solutions, including air quality monitoring, water quality monitoring and smart grids.

The company maintains public developer-facing resources, including an API documentation and code-examples repository, a collection of Jupyter notebooks, public demos, and open-source front-end projects such as a multi-renderer charts library (cirrusjs) and reusable UI components for building data applications. Repository activity spans 2016 through 2023.

▸Full profile — market position, technology, go-to-market, geography

Market position

Positioned as an intermediary between environmental data providers and end users, emphasizing reduced data-integration effort for customers.

Technology

Planet OS aggregates weather, climate and environmental data from multiple providers and exposes it through an API, with public documentation, code examples and Jupyter notebooks supporting integration. Its public repositories include JavaScript charting and UI component libraries for data applications, a JavaScript OPeNDAP client (jsdap), and Scala- and Java-based components including forks of an Elasticsearch Scala client and a Java implementation of the zarr API.

Go-to-market

Materials indicate an orientation toward organizations that consume environmental data, including research and education users and customers working in climate adaptation, air and water quality monitoring, and smart grids; developer-oriented API documentation, notebooks and demos suggest technical users integrating data programmatically.

Geography

Listed with a location in Amsterdam, Netherlands.

Compiled by commissioned research from 2 cited public sources — announcements, filings, and press listed under research sources below.

Key figures

latest reported

Employee count rangeJan 202521-50

Github public repositoriesJan 202511 repositories

Company-reported or press-reported figures, each dated to when it was claimed — not independently audited.

Founder mafia

2 people who came through Planet OS went on to found or lead other companies.

Ivar SiimarAngel investorFounded Trind Ventures Talal G. ShamoonDirectorFounded Intertrust

Legal entities · 1

corporate structure

Planet OSDelaware

▸Research sources · 2

primary sources listed

Planet OS · GitHubgithub.com · web

2 public sources were cited for this profile; the first-party ones are listed here.

Frequently asked questions

What does Planet OS do?: Planet OS provides streamlined access to weather, climate and environmental data from leading data providers.
Who founded Planet OS?: Planet OS was founded by Rainer Sternfeld, Kalle Kagi in 2012.
Who are Planet OS's investors?: Planet OS's investors include Trind Ventures.
How much funding has Planet OS raised?: Planet OS has disclosed $5M raised across 1 round.
Where is Planet OS headquartered?: Planet OS is headquartered in Sunnyvale, US.