What is AlterG?
Founded in 2005 and headquartered in Fremont, California, AlterG operates at the intersection of medical device engineering and human performance. The company is best known for its proprietary anti-gravity treadmill technology, which utilizes differential air pressure to allow patients and athletes to exercise with reduced body weight. This innovation has become a staple in clinical rehabilitation settings and elite sports training facilities, providing a unique mechanism for gait retraining and injury recovery. By bridging the gap between traditional physical therapy and advanced biomechanical support, AlterG has established a defensible niche in the healthcare technology sector, consistently leveraging its intellectual property to maintain a competitive advantage in the global mobility market.
How much funding has AlterG raised?
AlterG has raised a total of $55.3M across 8 funding rounds:
Series B
$8M
Debt
$2M
Series C
$10.3M
Debt
$15M
Debt
$3.5M
Unspecified
$6M
Debt
$8M
Series B (2009): $8M led by Red Planet Capital and Versant Ventures
Debt (2010): $2M supported by Versant Ventures
Series C (2012): $10.3M featuring Versant Ventures
Debt (2015): $15M backed by Oxford Finance
Debt (2017): $3.5M with participation from Siena Lending Group, LLC and First West Capital
Unspecified (2018): $6M led by Versant Ventures, Sorehsa AG, Leerink Revelation Partners, and Partner Ventures
Debt (2021): $8M supported by Cortland Credit Group
Key Investors in AlterG
Versant Ventures
A global venture capital firm focused on building innovative biotechnology and medical device companies through deep scientific expertise and extensive industry partnerships.
Red Planet Capital
A public-private partnership fund that historically bridged the gap between NASA-developed technologies and private sector commercial applications in biomedical and industrial fields.
Oxford Finance
A specialty finance firm providing flexible debt solutions tailored to the unique capital requirements of healthcare and life sciences organizations.
What's next for AlterG?
The recent infusion of capital signals a strategic pivot toward operational optimization and market expansion. Having moved through various funding cycles—from early-stage venture capital to sophisticated debt financing—AlterG is now positioned to leverage its mature product portfolio to capture additional market share in the post-acute care and professional sports segments. Future growth will likely focus on integrating digital health analytics into its existing hardware, further enhancing the value proposition for clinical providers. As the company continues to refine its capital structure, the focus remains on sustaining long-term profitability while maintaining its leadership in the specialized medical device landscape.
See full AlterG company page
