The amount of the transaction was not disclosed.
Launched in July 2012 by CEO Jeff Lynn, Seedrs is a fully regulated equity crowdfunding platform open to investors and entrepreneurs throughout Europe.
To date, it has supported the pitches of 58 startups, which have raised more than £5.6m ($9.1m) in capital.
The company recently used its own platform to secure £2.58m ($3.5m) of its own capital.
Seedrs is authorized and regulated by the Financial Conduct Authority (FCA) in the UK.