United States · 
Who invested in Mailbox?
Mailbox's investors include SV Angel, CRV, Kapor Capital, CrunchFund and Matt Brezina.
United States · Series A startup
Who invested in Mailbox
One round we have observed, with the 5 investors named in it. 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
$5.0Mraised across 1 round since 2011, from 1 source
- Latest round
- Series A, $5.0MNov 2011
- Investors
- 5
The rounds
- Nov 2011
The exit
ExitBuyerPriceWhen
From historical deal records. Wrong? Tell us.
Everyone who backed them
Matt BrezinaAngel1round
Missing a round, or an investor who was in one? Tell us.
Quick answers about Mailbox
How much has Mailbox raised?
Mailbox has raised $5.0M across 1 round since 2011.
When did Mailbox last raise?
Mailbox's most recent round was a Series A of $5.0M in Nov 2011.
What was Mailbox's biggest round?
Its most recent round, $5.0M in Nov 2011, is also its largest on record.
Who backed Mailbox first?
Mailbox's first round on record, in Nov 2011, was backed by SV Angel, CRV and Kapor Capital and 2 others.
What stage is Mailbox at?
Mailbox's latest named round is a Series A, in Nov 2011.
Where is Mailbox based?
Mailbox is based in the United States.
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