Who invested in FirstString?
FirstString's investors include Park West and Sophos Capital.
United States · Funded startup
2 rounds we have observed, with the 2 investors named in them. Every figure came from a named source, and where the company reported a raise to the SEC itself, that is shown beside it.
Funding summaryUpdated 26 Oct 2026
$15Mraised across 2 rounds since 2008, from 2 sources
Each circle is a round, placed by date and sized by amount. The line above is the running total.
The busiest backers across the latest rounds. A filled square is a round they joined; a dark one, a round they led.
FirstString's investors include Park West and Sophos Capital.
FirstString has raised $15M across 2 rounds since 2008.
FirstString's most recent round was an Undisclosed round of $15M in Jan 2018.
Its most recent round, $15M in Jan 2018, is also its largest on record.
FirstString's first round on record, in Jan 2018, was backed by Park West and Sophos Capital.
FirstString's latest named round is an Undisclosed round, in Jan 2018.
FirstString is based in the United States.
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