United States · 
Who invested in PostX?
PostX's investors include Mayfield Fund, Alloy Ventures, Charles Schwab and Sunrise Capital Partners.
United States · Series B startup
Who invested in PostX
Funding summaryUpdated 26 Oct 2026
$11Mraised across 1 round since 2001, from 1 source
- Latest round
- Series B, $11MNov 2001
- Investors
- 4
The rounds
- Nov 2001Series B$11M
From a historical funding record
The exit
ExitBuyerPriceWhen
AcquiredIronPort SystemsundisclosedNov 2006
From historical deal records. Wrong? Tell us.
Everyone who backed them
Alloy VenturesVC firm1round
Sunrise Capital PartnersVC firm1round
Missing a round, or an investor who was in one? Tell us.
Also claim to have backed them
These 2 firms list PostX as a portfolio company on their own websites, but no report of a round names them. They are the firms' own claims, kept apart from the rounds above.
Quick answers about PostX
How much has PostX raised?
PostX has raised $11M across 1 round since 2001.
When did PostX last raise?
PostX's most recent round was a Series B of $11M in Nov 2001.
What was PostX's biggest round?
Its most recent round, $11M in Nov 2001, is also its largest on record.
Who backed PostX first?
PostX's first round on record, in Nov 2001, was backed by Mayfield Fund, Alloy Ventures and Charles Schwab and 1 others.
What stage is PostX at?
PostX's latest named round is a Series B, in Nov 2001.
Where is PostX based?
PostX is based in the United States.
Companies like PostX
In the same sector, and raised in the last eighteen months.
Find investors like these
Search every investor by what they have actually funded, then narrow to your stage and market. Free.