# Skeleton Technologies OÜ

Startup profile on Capital Atlas: https://capitalatlas.ai/startups/skeleton-technologies-ou

- Industry: Energy Storage & Batteries
- Headquarters: Tallinn, Estonia
- Website: www.skeletontech.com/
- Total disclosed funding: $156M
- Latest round: Series E (Oct 13, 2023)
- Investors on record: 12

## About

Skeleton Technologies, based in Tallinn, Estonia, is known for its advanced energy storage solutions. The company specializes in supercapacitors and cutting-edge battery technologies tailored for a range of demanding uses.

Founded in 2009, Skeleton Technologies OÜ is a leading innovator in energy storage, recognized for its supercapacitors and SuperBattery technology. In May 2026, the company secured EUR 33 million in pre-IPO funding from Axon Partners Group, SmartCap, and Taiwania Capital. CEO Taavi Madiberk has played a key role in guiding the company’s strategy and growth since its founding.

Skeleton Technologies develops high-power energy storage solutions, with a focus on supercapacitors and their unique SuperBattery technology. Their products are used in AI data centers, automotive systems, heavy transport, and grid stabilization. The GrapheneGPU system and SuperBattery provide efficient power delivery and rapid charging for demanding environments, supporting clients in Europe, North America, and Asia in sectors such as data centers, automotive, and utilities.

In 2023, Skeleton Technologies recorded a revenue of EUR 9,139,297.50 and an EBITDA of EUR -831,046.50. The company generates its revenue through direct B2B sales of energy storage solutions, forming contracts with clients in energy-intensive sectors to deliver customized solutions that address their specific operational requirements.

The company will use the funding to expand manufacturing, address AI data center power demand, and support expansion of production capacity, including into the United States.

## Funding rounds

- Series E, Oct 13, 2023 — Marubeni, Siemens Financial Services, Companhia Brasileira de Metalurgia e Mineração, InnoEnergy
- Series D, Jan 28, 2022, $42M — Adyen B.V., InnoEnergy, Nidoco, Skaala
- Series D, Jun 1, 2021, $35M — Marubeni, Adyen B.V., MM Grupp, AS HARJU ELEKTER
- Series D, Nov 3, 2020, $48M — FirstFloor Capital, Adyen B.V., InnoEnergy, MM Grupp, AS HARJU ELEKTER
- Series C, Aug 3, 2016, $14M — FirstFloor Capital, Up Invest
- Series B, Jun 5, 2015, $11M — The NASDAQ OMX Group, Inc., Up Invest
- Series A, Aug 1, 2014, $2.3M — Up Invest
- Series A, Apr 16, 2013, $2.9M — Up Invest

## Investors

- Up Invest (https://capitalatlas.ai/funds/up-invest) — Series A, Series B, Series C
- The NASDAQ OMX Group, Inc. — Series B
- FirstFloor Capital (https://capitalatlas.ai/funds/firstfloor-capital) — Series C, Series D
- Adyen B.V. — Series D
- InnoEnergy (https://capitalatlas.ai/funds/innoenergy) — Series D, Series E
- MM Grupp (https://capitalatlas.ai/funds/mm-grupp) — Series D
- AS HARJU ELEKTER — Series D
- Marubeni — Series D, Series E
- Nidoco (https://capitalatlas.ai/funds/nidoco) — Series D
- Skaala (https://capitalatlas.ai/funds/skaala) — Series D
- Siemens Financial Services — Series E
- Companhia Brasileira de Metalurgia e Mineração — Series E