Acton Capital is a German venture capital firm founded in 1999, specializing in investing in tech-enabled startups across Europe and North America. With over 25 years of experience, Acton Capital focuses on early growth-stage companies, typically investing between €5-10 million in sectors such as financial technology (fintech), mobility, healthcare, and direct-to-consumer or recommerce models. The firm has a history of successful exits, including online marketplace AbeBooks (acquired by Amazon in 2008), online retailer zooplus (IPO in 2008), luxury fashion platform mytheresa.com (acquired by Neiman Marcus Group in 2014), global online marketplace Etsy (IPO in 2015), and Canadian software developer Themis Solutions (Clio) in 2019.

Acton Capital's investment approach is highly focused, partnering with a select number of founders each year to help mission-driven teams develop growth strategies tailored to their unique situations. The firm is generalist in nature and typically enters at the early growth stage, with a sweet spot for initial investments of €5-10 million into companies founded by industry experts across Europe and Canada. In November 2023, Acton Capital closed its sixth venture capital fund, "Acton IV," at €225 million, aiming to back companies ready to scale and built to last.