Early stage investing firm Susa Ventures has started raising its second fund, worth $50 million, according to a filing with the Securities and Exchange Commission.

The firm has offices in San Francisco and New York, but is based in the Fairfax neighborhood of Los Angeles.

The firm closed its first fund, worth $25 million, last year. That fund was focused on data-centric founders and businesses. Susa Venture investments include Whisper, Periscope and Pipeline DB.

Susa Ventures General Partner Eva Ho declined to comment on the fundraising.

Technology reporter Garrett Reim can be reached at [email protected]. Follow him on Twitter @garrettreim for the latest in L.A. tech news.